CN114630362B - Method for calculating support degree of space spectrum resources to satellite communication system downlink - Google Patents
Method for calculating support degree of space spectrum resources to satellite communication system downlink Download PDFInfo
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Abstract
The invention discloses a method for calculating the support of space spectrum resources to a satellite communication system downlink, which comprises the following steps: acquiring related calculation parameter information; searching a wave beam which meets the target frequency band condition in the spatial frequency spectrum resource to be calculated; dividing an earth area grid needing to be subjected to support degree calculation into K grid points; respectively judging whether each grid point earth station meets the lowest communication requirement of a satellite system downlink by using the transmitting power spectral density and the demodulation threshold required by a user; and counting the number of the grid point earth stations meeting the minimum communication requirement of the downlink of the satellite communication system, and calculating the support degree of the downlink. The method decomposes the target earth region by using a grid method, the calculation of the support degree is more comprehensive and credible, and a user can select to use the transmitting power spectrum density to calculate the support degree when needing rough support degree, and select to use a demodulation threshold to calculate if needing accurate support degree. The method is simple and has better project realizability.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method for calculating the support of space spectrum resources to a satellite communication system downlink.
Background
The spatial spectrum resource refers to satellite frequency and orbit resource and is an essential element for the development of satellite systems. With the development of satellite communication technology, the competition of world countries for space spectrum resources is more and more in a trend of becoming white. When the space spectrum resources are utilized, the value of the space spectrum resources to the satellite system needs to be evaluated to judge whether the resources can be effectively applied to the satellite system or not so as to achieve the purpose of efficiently utilizing the space spectrum resources. The downlink support degree is the ratio of the number of information which can be successfully transmitted to the satellite system by the earth station in the satellite communication system, and in the actual calculation, a certain region on the earth needs to be specified, the region needs to be divided into grid points, and the support degree between the grid points and the satellite system for space spectrum resource application needs to be calculated respectively. The existing method for calculating the support of the space spectrum resource downlink is relatively deficient, so that an existing implementation scheme is not available at present, and a complete method for calculating the support of the space spectrum resource to the satellite communication system downlink is necessary to be researched and formulated in order to enhance the reserve of frequency-orbit resources for a satellite system in China.
Disclosure of Invention
The invention discloses a method for calculating the support degree of space spectrum resources to a satellite communication system downlink, which aims to solve the problem that the conventional method for calculating the support degree of the space spectrum resources to the satellite communication system downlink is relatively deficient, can quantitatively calculate the support degree of the space spectrum resources to the satellite system downlink, and can calculate whether the space spectrum resources meet the minimum communication requirement of the satellite system downlink or not by longitude and latitude areas. Downlink support refers to the number of earth stations in a satellite communication system that can successfully transmit information to the satellite system as a proportion of the total number of earth stations.
The invention discloses a method for calculating the support of space spectrum resources to a satellite communication system downlink, which comprises the following steps:
s1, acquiring related calculation parameter information; the method specifically comprises a spatial frequency spectrum resource identifier ntc _ id required to be calculated, an earth region required to be subjected to support degree calculation, a target frequency band freq _ need, a selection identifier method _ flag of a calculation method, a transmitting power spectral density psd required by a user and a demodulation threshold required by the user;
s2, searching beams which meet the target frequency band condition in the space spectrum resources to be calculated;
and acquiring all beams under the space frequency spectrum resource according to the space frequency spectrum resource identifier ntc _ id, sequentially reading the frequency range of each beam, comparing the frequency range with a target frequency band freq _ need, if the frequency ranges of the two beams are overlapped, storing the beam information into an array freq _ list, and taking the beam as a beam meeting the target frequency band condition in the space frequency spectrum resource.
S3, dividing the region grid of the earth region needing to be subjected to support degree calculation into K grid points; according to the longitude and latitude of the regional region on the map, uniformly dividing the regional region into K grid points, wherein each grid point is provided with an earth station of a satellite communication system, namely a grid point earth station, and each grid point earth station is identified by a longitude and latitude sequence; judging a selection identifier method _ flag of the calculation method, if the method _ flag is 0, judging a grid point earth station by using a transmitting power spectral density psd required by a user, and turning to a step S4; if the method _ flag is 1, the demodulation threshold required by the user is used for judging the grid point earth station, and the step S5 is carried out.
S4, judging whether each grid point earth station meets the lowest communication requirement of a satellite system downlink by using the transmitting power spectral density required by a user, and turning to the step S6;
according to the K grid point earth stations obtained in the step S3, sequentially testing whether each grid point earth station meets the lowest communication requirement of a downlink, setting an identification ok _ flag field in each grid point earth station to indicate whether the grid point earth station meets the requirement, and initializing the identification ok _ flag field to be 0; for each grid point earth station, for each beam meeting the target frequency band condition in each spatial spectrum resource in freq _ list, the following operations are performed:
s41, judging whether the mesh point earth station meets the lowest communication requirement of a downlink, detecting an ok _ flag field, if the ok _ flag field is 1, indicating that the mesh point earth station meets the lowest communication requirement of the downlink, directly ending the operation, and jumping to the next mesh point earth station to continue operating the beam of the mesh point earth station; if ok _ flag is 0, proceed to step S42.
S42, calculating the path distance d between the satellite and the grid point earth station in the satellite communication system, wherein the calculation formula is as follows:
where θ is the difference between the longitude of the satellite and the grid point earth station, and α is the grid point earth station latitude. And acquiring longitude and latitude coordinates of the satellite by using the space spectrum resource identifier ntc _ id.
And S43, calculating the beam center frequency f. According to the frequency range { freq _ min, freq _ max } of the beam, the beam center frequency is calculated by the formula:
f＝(freq_min+freq_max)/2；
s44, calculating the path loss L F . Obtaining path loss L from the earth station of the grid point to the satellite according to the path d and the beam center frequency f F The calculation formula is as follows:
L F ＝92.45+20lg(d×f)；
and S45, calculating the satellite transmitting power P. And acquiring the maximum transmitting power pwr _ ds _ nbw of the beam group through the grp _ id according to the beam group identification grp _ id corresponding to the beam, and taking the maximum transmitting power pwr _ ds _ nbw as the transmitting power P of the satellite. The beam group identity grp _ id is used to identify a group of beams with certain same performance under the same spatial spectrum resource identity.
And S46, calculating satellite transmission gain G. And acquiring corresponding gain according to the beam group identifier grp _ id corresponding to the beam, and taking the gain as the transmission gain G of the satellite.
And S47, calculating the Effective Isotropic Radiated Power (EIRP) of the grid point earth station. According to the path loss L F The effective omnidirectional radiation power EIRP is obtained by the satellite transmitting power P and the satellite gain G, and the calculation formula is as follows:
EIRP＝P+G-L F ；
and S48, detecting whether the earth station of the grid point meets the minimum communication requirement of the downlink of the satellite communication system under the beam. Judging according to the transmitting power spectral density psd required by a user, if the EIRP is more than or equal to the psd, indicating that the earth station of the mesh point meets the lowest communication requirement of a satellite communication system downlink under the wave beam, and setting ok _ flag to be 1; if EIRP < psd, the earth station of the mesh point can not reach the minimum communication requirement of the downlink of the satellite communication system under the beam.
S5, calculating whether each grid point earth station meets the lowest communication requirement of a satellite communication system downlink by using a demodulation threshold required by a user, and turning to the step S6;
according to the K grid point earth stations obtained in the step S3, whether each grid point earth station meets the lowest communication requirement of a satellite communication system downlink is calculated in sequence, an identification ok _ flag field is set in each grid point earth station to indicate whether the grid point earth station meets the requirement, and the ok _ flag field is initialized to 0; for each grid point earth station, for each beam meeting the target frequency band condition in each spatial spectrum resource in freq _ list, the following operations are performed:
s51, whether the grid point earth station meets the minimum communication requirement of the satellite communication system downlink is judged. Detecting an identification ok _ flag field of the mesh point earth station, if the ok _ flag field is 1, indicating that the mesh point earth station meets the lowest communication requirement of a satellite communication system downlink, directly ending the operation, and jumping to the next mesh point earth station to continue operating a beam of the mesh point earth station; if ok _ flag is 0, continuing to perform step S52;
and S52, calculating a path d between the satellite and the grid point earth station in the satellite system. The calculation formula is as follows:
where θ is the difference between the longitude of the satellite and the grid point earth station, and α is the grid point earth station latitude. Acquiring a satellite longitude and latitude coordinate by using a space spectrum resource identifier ntc _ id;
and S53, calculating the beam center frequency f. According to the frequency range { freq _ min, freq _ max } of the beam, the beam center frequency is calculated by the formula:
f＝(freq_min+freq_max)/2，
s54, calculating the path loss L F . Obtaining path loss from the earth station of the grid point to the satellite communication system from the path d and the beam center frequency fConsumption L F The calculation formula is as follows:
L F ＝92.45+20lg(d×f)；
and S55, calculating the satellite transmitting power P. And acquiring the maximum transmitting power pwr _ ds _ nbw of the beam group through the grp _ id according to the beam group identification grp _ id corresponding to the beam, and taking the maximum transmitting power pwr _ ds _ nbw as the transmitting power P of the satellite. The beam group identity grp _ id is used to identify a group of beams with certain same performance under the same spatial spectrum resource identity.
And S56, calculating the grid point earth station receiving gain. And calculating the contour line coArea of the projection range of the beam according to the space frequency spectrum resource identifier ntc _ id and the projection range of the beam on the earth, and obtaining the receiving gain of the grid point earth station according to the distance between the central point of the projection range and the grid point earth station.
And S57, calculating a satellite receiving gain G. And acquiring corresponding gain according to the beam group identifier grp _ id corresponding to the beam, and taking the gain as satellite receiving gain G.
S58, calculating the receiving power P of the grid point earth station r . According to the path loss L F The satellite transmitting power P and the grid point earth station receiving gain are obtained to obtain the grid point earth station receiving power P r The calculation formula is as follows:
P r ＝G+P-L F +gain；
and S59, detecting whether the earth station of the grid point meets the minimum communication requirement of the downlink of the satellite communication system under the beam. Judging according to the demodulation threshold required by the user, if P is r If the wave beam is greater than or equal to threshold, the earth station of the grid point is explained to reach the lowest communication requirement of a satellite communication system downlink under the wave beam, and ok _ flag is set to be 1; if P r If < threshold, it means that the earth station of the grid point does not reach the minimum communication requirement of the downlink of the satellite communication system under the beam.
S6, counting the number of grid point earth stations meeting the minimum communication requirement of a satellite communication system downlink, and calculating the support degree of the downlink; for K grid point earth stations, the ok _ flag field of the K grid point earth stations is circularly detected, and num variable records are set to reach satellite communicationThe minimum number of mesh point earth stations required for communication on the downlink of the communication system. If the ok _ flag field of the grid point earth station is 1, adding 1 to the num variable; num is unchanged when the ok _ flag field of the grid point earth station is 0. Taking the ratio of the number of the grid point earth stations meeting the minimum communication requirement to the total number of the grid point earth stations as the support degree support of the space spectrum resource to the downlink of the satellite communication system up The calculation formula is as follows:
wherein K is the total number of grid points earth stations.
The invention has the beneficial effects that:
(1) According to the method, the target earth region is decomposed by using a grid method, and the calculation of the support degree is more comprehensive and credible; (2) The calculation method of the invention is optional, when a user needs rough support, the user can choose to use the transmitting power spectrum density to calculate the support, if the user needs accurate support, the user chooses to use the demodulation threshold to calculate; (3) The method is simple, has strong operability and better project realizability.
Drawings
FIG. 1 is a flow chart of an implementation of the method of the present invention;
FIG. 2 is a schematic diagram of a user calibrating a target area according to the present invention;
FIG. 3 is a schematic diagram of a segmentation grid according to the present invention.
Detailed Description
For a better understanding of the present disclosure, three examples are given herein.
FIG. 1 is a flow chart of an implementation of the method of the present invention; FIG. 2 is a schematic diagram of a user calibrating a target area according to the present invention; FIG. 3 is a schematic diagram of a segmentation grid according to the present invention.
The first embodiment is as follows:
the invention discloses a method for calculating the support of space spectrum resources to a satellite communication system downlink, which comprises the following steps:
s1, acquiring related calculation parameter information; the method specifically comprises a spatial frequency spectrum resource identifier ntc _ id required to be calculated, an earth region required to be subjected to support degree calculation, a target frequency band freq _ need, a selection identifier method _ flag of a calculation method, a transmitting power spectral density psd required by a user and a demodulation threshold required by the user;
s2, searching beams which meet the target frequency band condition in the space spectrum resources to be calculated;
and acquiring all beams under the space spectrum resource according to the space spectrum resource identifier ntc _ id, sequentially reading the frequency range of each beam, comparing the frequency range with a target frequency band freq _ need, if the frequency range is overlapped with the target frequency band freq _ need, storing the beam information into an array freq _ list, and taking the beam as the beam meeting the target frequency band condition in the space spectrum resource.
S3, dividing the region grid of the earth region needing to be subjected to support degree calculation into K grid points; according to the longitude and latitude of the area region on the map, the area region is evenly divided into K grid points, each grid point is provided with an earth station of a satellite communication system, the earth station is called a grid point earth station, and each grid point earth station is identified by a longitude and latitude sequence; judging a selection identifier method _ flag of the calculation method, if the method _ flag is 0, judging a grid point earth station by using a transmitting power spectral density psd required by a user, and turning to a step S4; if the method _ flag is 1, the demodulation threshold required by the user is used for judging the grid point earth station, and the step S5 is carried out.
S4, judging whether each grid point earth station meets the lowest communication requirement of a satellite system downlink by using the transmitting power spectral density required by a user, and turning to the step S6;
according to the K grid point earth stations obtained in the step S3, sequentially testing whether each grid point earth station meets the lowest communication requirement of a downlink, setting an identification ok _ flag field in each grid point earth station to indicate whether the grid point earth station meets the requirement, and initializing the identification ok _ flag field to be 0; for each mesh point earth station, performing the following operations on each beam meeting the target frequency band condition in each spatial frequency spectrum resource in freq _ list:
s41, judging whether the mesh point earth station meets the lowest communication requirement of a downlink, detecting an ok _ flag field, if the ok _ flag field is 1, indicating that the mesh point earth station meets the lowest communication requirement of the downlink, directly ending the operation, and jumping to the next mesh point earth station to continue operating the beam of the mesh point earth station; if ok _ flag is 0, proceed to step S42.
S42, calculating the path distance d between the satellite and the grid point earth station in the satellite communication system, wherein the calculation formula is as follows:
where θ is the difference between the longitude of the satellite and the grid point earth station, and α is the grid point earth station latitude. And acquiring longitude and latitude coordinates of the satellite by using the space spectrum resource identifier ntc _ id.
And S43, calculating the beam center frequency f. According to the frequency range { freq _ min, freq _ max } of the beam, the beam center frequency is calculated by the formula:
f＝(freq_min+freq_max)/2；
s44, calculating the path loss L F . Obtaining path loss L from the earth station of the grid point to the satellite according to the path d and the beam center frequency f F The calculation formula is as follows:
L F ＝92.45+20lg(d×f)；
and S45, calculating satellite transmitting power P. And acquiring the maximum transmitting power pwr _ ds _ nbw of the beam group through the grp _ id according to the beam group identification grp _ id corresponding to the beam, and taking the maximum transmitting power pwr _ ds _ nbw as the transmitting power P of the satellite. The beam group identity grp _ id is used to identify a group of beams with certain same performance under the same spatial spectrum resource identity.
And S46, calculating satellite gain G. And acquiring corresponding gain according to the beam group identifier grp _ id corresponding to the beam, and taking the gain as the transmission gain G of the satellite.
And S47, calculating the Effective Isotropic Radiated Power (EIRP) of the grid point earth station. According to path lossL consumption F The effective omnidirectional radiation power EIRP is obtained by the satellite transmitting power P and the satellite gain G, and the calculation formula is as follows:
EIRP＝P+G-L F ；
and S48, detecting whether the earth station of the grid point meets the minimum communication requirement of the downlink of the satellite communication system under the beam. Judging according to the transmitting power spectral density psd required by a user, if the EIRP is more than or equal to the psd, indicating that the earth station of the mesh point meets the lowest communication requirement of a satellite communication system downlink under the wave beam, and setting ok _ flag to be 1; if EIRP < psd, the mesh point earth station can not reach the minimum communication requirement of the downlink of the satellite communication system under the beam.
S5, calculating whether each grid point earth station meets the lowest communication requirement of a satellite communication system downlink by using a demodulation threshold required by a user, and turning to the step S6;
according to the K grid point earth stations obtained in the step S3, whether each grid point earth station meets the lowest communication requirement of a satellite communication system downlink is calculated in sequence, an identification ok _ flag field is set in each grid point earth station to indicate whether the grid point earth station meets the requirement, and the ok _ flag field is initialized to 0; for each grid point earth station, for each beam meeting the target frequency band condition in each spatial spectrum resource in freq _ list, the following operations are performed:
s51, whether the grid point earth station meets the minimum communication requirement of the satellite communication system downlink is judged. Detecting an identification ok _ flag field, if the ok _ flag field is 1, indicating that the mesh point earth station meets the lowest communication requirement of a satellite communication system downlink, directly ending the operation, and jumping to the next mesh point earth station to continue operating the beam of the mesh point earth station; if ok _ flag is 0, continuing to perform step S52;
and S52, calculating a path d between the satellite and the grid point earth station in the satellite system. The calculation formula is as follows:
where θ is the difference between the longitude of the satellite and the grid point earth station, and α is the grid point earth station latitude. Acquiring a satellite longitude and latitude coordinate by using a space spectrum resource identifier ntc _ id;
and S53, calculating the beam center frequency f. According to the frequency range { freq _ min, freq _ max } of the beam, the beam center frequency is calculated by the formula:
f＝(freq_min+freq_max)/2，
s54, calculating the path loss L F . Obtaining path loss L from the mesh point earth station to the satellite communication system from the path d and the beam center frequency f F The calculation formula is as follows:
L F ＝92.45+20lg(d×f)；
and S55, calculating the satellite transmitting power P. And acquiring the maximum transmitting power pwr _ ds _ nbw of the beam group through the grp _ id according to the beam group identification grp _ id corresponding to the beam, and taking the maximum transmitting power pwr _ ds _ nbw as the transmitting power P of the satellite. The beam group identity grp _ id is used to identify a group of beams with certain same performance under the same spatial spectrum resource identity.
And S56, calculating the grid point earth station receiving gain. And calculating the contour line coArea of the projection range of the beam according to the space frequency spectrum resource identifier ntc _ id and the projection range of the beam on the earth, and obtaining the receiving gain of the grid point earth station according to the distance between the central point of the projection range and the grid point earth station.
And S57, calculating a satellite receiving gain G. And acquiring corresponding gain according to the beam group identifier grp _ id corresponding to the beam, and taking the gain as satellite receiving gain G.
S58, calculating the receiving power P of the grid point earth station r . According to the path loss L F The satellite transmitting power P and the grid point earth station receiving gain are obtained to obtain the grid point earth station receiving power P r The calculation formula is as follows:
P r ＝G+P-L F +gain；
and S59, detecting whether the earth station of the grid point meets the minimum communication requirement of the downlink of the satellite communication system under the beam. Root of herbaceous plantsJudging according to the demodulation threshold required by the user, if P is r If the wave beam is greater than or equal to threshold, the earth station of the grid point meets the lowest communication requirement of a downlink of a satellite communication system under the wave beam, and ok _ flag is set to be 1; if P r If < threshold, it means that the earth station of the grid point does not reach the minimum communication requirement of the downlink of the satellite communication system under the beam.
S6, counting the number of grid point earth stations meeting the lowest communication requirement of a downlink of the satellite communication system, and calculating the support degree of the downlink; and circularly detecting ok _ flag fields of the K grid point earth stations, and setting a num variable to record the number of the grid point earth stations which reach the minimum communication requirement of a satellite communication system downlink. If the ok _ flag field of the earth station of the grid point is 1, adding 1 to the num variable; num is unchanged when the ok _ flag field of the mesh point earth station is 0. Taking the ratio of the number of the grid point earth stations meeting the minimum communication requirement to the total number of the grid point earth stations as the support degree support of the space spectrum resource to the downlink of the satellite communication system up The calculation formula is as follows:
wherein K is the total number of grid points earth stations.
Example two:
the invention discloses a method for calculating the support of space spectrum resources to a satellite communication system downlink, which comprises the following steps:
s1, acquiring related calculation parameter information, wherein the related calculation parameter information specifically comprises a spatial frequency spectrum resource identifier ntc _ id required to be calculated, an earth region required to be subjected to support degree calculation, a target frequency band freq _ need, a selection identifier method _ flag of a calculation method, a transmitting power spectral density psd required by a user and a demodulation threshold required by the user;
s2, searching beams which meet the target frequency band condition in the space spectrum resources to be calculated;
and substituting the spatial frequency spectrum resource identifier ntc _ id into an s _ beam table in an srs database, acquiring all beam beams _ name under the resource according to the spatial frequency spectrum resource identifier ntc _ id, sequentially reading the frequency range { freq _ min, freq _ max } (MHz) of each beam, comparing the frequency range with a target frequency band freq _ need, if the frequency bands of the two overlap, storing the beam information into an array freq _ list, and taking the beam as a beam meeting the target frequency band condition in the spatial frequency spectrum resource. The srs database includes the performance parameters of the satellite network currently in operation.
S3, dividing the region grid of the earth, which needs to be subjected to support calculation, into K grid points, calculating a segmentation grid of an external matrix of the region grid according to the longitude and latitude of the region grid on a map, uniformly dividing the region grid into K grid points, wherein each grid point is provided with an earth station of a satellite communication system, namely a grid point earth station, and each grid point earth station is identified by a longitude and latitude sequence; judging a selection identifier method _ flag of the calculation method, if the method _ flag is 0, judging the grid point earth station by using a transmitting power spectral density psd required by a user, and turning to a step S4; if the method _ flag is 1, the demodulation threshold required by the user is used for judging the grid point earth station, and the step S5 is carried out.
S4, judging whether each grid point earth station meets the lowest communication requirement of a satellite system downlink by using the transmitting power spectral density required by a user, and turning to the step S6;
according to the K grid point earth stations obtained in the step S3, sequentially testing whether each grid point earth station meets the lowest communication requirement of a downlink, setting an identification ok _ flag field in each grid point earth station to indicate whether the grid point earth station meets the requirement, and initializing the identification ok _ flag field to be 0; for each grid point earth station, for each beam meeting the target frequency band condition in each spatial spectrum resource in freq _ list, the following operations are performed:
s41, judging whether the mesh point earth station meets the lowest communication requirement of a downlink, detecting an ok _ flag field of the mesh point earth station, if the ok _ flag field is 1, indicating that the mesh point earth station meets the lowest communication requirement of the downlink, directly ending the operation, and jumping to the next mesh point earth station to continue operating beams of the mesh point earth station; if ok _ flag is 0, proceed to step S42.
S42, calculating the path distance d between the satellite and the grid point earth station in the satellite communication system, wherein the calculation formula is as follows:
where θ is the difference between the longitude of the satellite and the grid point earth station, and α is the grid point earth station latitude. And reading the bore _ long and bore _ lat fields of the s _ beam table by using the space spectrum resource identifier ntc _ id to acquire the longitude and latitude coordinates of the satellite. The unit of d is km.
And S43, calculating the beam center frequency f. According to the frequency range { freq _ min, freq _ max } of the beam, the beam center frequency is calculated by the formula:
f＝(freq_min+freq_max)/2；
s44, calculating the path loss L F . Obtaining path loss L from the earth station of the grid point to the satellite according to the path d and the beam center frequency f F The calculation formula is as follows:
L F ＝92.45+20lg(d×f)；
and S45, calculating satellite transmitting power P. And acquiring the maximum transmitting power pwr _ ds _ nbw of the beam group through the grp _ id by using an emiss table according to the beam group identification grp _ id corresponding to the beam, and taking the maximum transmitting power pwr _ ds _ nbw as the transmitting power P of the satellite. The beam group identity grp _ id is used to identify a group of beams with certain same performance under the same spatial spectrum resource identity. The emiss table records the maximum transmit power of each satellite beam of the satellite network in operation.
And S46, calculating satellite transmission gain G. And acquiring a gain corresponding to the beam group identifier grp _ id by using the e _ as _ stn table according to the beam group identifier grp _ id corresponding to the beam, and taking the gain as the transmission gain G of the satellite. The e _ as _ stn table records the transmission gain of each satellite of the operating satellite network.
And S47, calculating the Effective Isotropic Radiated Power (EIRP) of the grid point earth station. According to path lossConsumption L F The effective omnidirectional radiation power EIRP is obtained by the satellite transmission power P and the satellite transmission gain G, and the calculation formula is as follows:
EIRP＝P+G-L F ；
and S48, detecting whether the earth station of the grid point meets the minimum communication requirement of the downlink of the satellite communication system under the beam. Judging according to the transmitted power spectral density psd required by a user, if the EIRP is more than or equal to the psd, indicating that the mesh point earth station meets the lowest communication requirement of a satellite communication system downlink under the beam, and setting ok _ flag to 1; if EIRP < psd, the mesh point earth station can not reach the minimum communication requirement of the downlink of the satellite communication system under the beam.
S5, calculating whether each grid point earth station meets the lowest communication requirement of a satellite communication system downlink by using a demodulation threshold required by a user, and turning to the step S6;
sequentially calculating whether each grid point earth station meets the lowest communication requirement of a downlink of a satellite communication system according to the K grid point earth stations obtained in the step S3, setting an identification ok _ flag field in each grid point earth station to indicate whether the grid point earth station meets the requirement, and initializing the ok _ flag field to be 0; for each grid point earth station, for each beam meeting the target frequency band condition in each spatial spectrum resource in freq _ list, the following operations are performed:
s51, whether the grid point earth station meets the minimum communication requirement of the satellite communication system downlink is judged. Detecting an identification ok _ flag field of the mesh point earth station, if the ok _ flag field is 1, indicating that the mesh point earth station meets the lowest communication requirement of a satellite communication system downlink, directly ending the operation, and jumping to the next mesh point earth station to continue operating a beam of the mesh point earth station; if ok _ flag is 0, continuing to step S52;
and S52, calculating a path d between the satellite and the grid point earth station in the satellite system. The calculation formula is as follows:
where θ is the difference between the longitude of the satellite and the grid point earth station, and α is the grid point earth station latitude. Reading a bore _ long field and a bore _ lat field of an s _ beam table by using a space spectrum resource identifier ntc _ id to obtain a satellite longitude and latitude coordinate;
and S53, calculating the beam center frequency f. According to the frequency range { freq _ min, freq _ max } of the beam, the beam center frequency is calculated by the formula:
f＝(freq_min+freq_max)/2，
s54, calculating the path loss L F . Obtaining path loss L from the mesh point earth station to the satellite communication system from the path d and the beam center frequency f F The calculation formula is as follows:
L F ＝92.45+20lg(d×f)；
and S55, calculating the satellite transmitting power P. And acquiring the maximum transmitting power pwr _ ds _ max of the beam group through the grp _ id by using an emiss table according to the beam group identification grp _ id corresponding to the beam, and taking the maximum transmitting power pwr _ ds _ max as the transmitting power P of the satellite. The beam group identity grp _ id is used to identify a group of beams with certain same performance under the same spatial spectrum resource identity. The emiss table records the maximum transmit power of each satellite beam of the operating satellite network.
And S56, calculating a grid point earth station receiving gain. And calculating the contour line coArea of the projection range of the beam according to the space spectrum resource identifier ntc _ id and the projection range of the beam on the earth, and obtaining the receiving gain of the grid point earth station according to the distance between the central point of the projection range and the grid point earth station.
And S57, calculating satellite receiving gain G. And (4) obtaining all beam group identifications grp _ id by substituting the spatial frequency spectrum resource identifications ntc _ id into a grp table in the srs database. And according to the beam group identification grp _ id corresponding to the beam, bringing the grp _ id into an e _ as _ stn table in an srs database, acquiring the corresponding gain of the grp _ id, and taking the gain as satellite receiving gain G. The e _ as _ stn table records the gain of each satellite of the operating satellite network.
S58, calculating grid point earth station receiving power P r . According to path lossConsumption L F The satellite transmitting power P and the grid point earth station gain are obtained to obtain the grid point earth station receiving power P r The calculation formula is as follows:
P r ＝G+P-L F +gain；
and S59, detecting whether the earth station of the mesh point meets the minimum communication requirement of the downlink of the satellite communication system under the beam. Judging according to the demodulation threshold required by the user, if P is r If the wave beam is greater than or equal to threshold, the earth station of the grid point meets the lowest communication requirement of a downlink of a satellite communication system under the wave beam, and ok _ flag is set to be 1; if P r If < threshold, it means that the earth station of the grid point does not reach the minimum communication requirement of the downlink of the satellite communication system under the beam.
S6, counting the number of grid point earth stations meeting the minimum communication requirement of a satellite communication system downlink, and calculating the support degree of the downlink; and circularly detecting ok _ flag fields of the K grid point earth stations, and setting a num variable to record the number of the grid point earth stations which reach the minimum communication requirement of a satellite communication system downlink. If the ok _ flag field of the grid point earth station is 1, adding 1 to the num variable; num is unchanged when the ok _ flag field of the grid point earth station is 0. Taking the ratio of the number of the grid point earth stations meeting the minimum communication requirement to the total number of the grid point earth stations as the support degree support of the space spectrum resource to the downlink of the satellite communication system up The calculation formula is as follows:
wherein K is the total number of grid points earth stations.
Example three:
network data ntc _ id of the track resource at spatial frequency: 111500204 is an example, the satellite network name is CHNSAT-130E.
Step 1, inputting parameters required by calculation.
1. Inputting a spatial spectrum resource identifier ntc _ id required to be calculated: 111500204. the specific content of the target frequency band freq _ need is shown in table 1. The selection flag of the calculation method is 1, the transmitted power spectral density psd is 10, and the demodulation threshold is 18.
TABLE 1 target frequency band Table
| freq_min | freq_max |
| 1980 | 2010 |
| 2025 | 2110 |
| 2170 | 2290 |
| 2500 | 2535 |
| 2655 | 2690 |
| 10700 | 11450 |
| 11700 | 13250 |
| 13750 | 14450 |
| 14500 | 14800 |
| 17300 | 21200 |
| 27000 | 31000 |
2. The earth region for which the support calculation is performed is input, and a target region of an arbitrary shape is marked on the map by the user and is referred to as a region, as shown in fig. 2.
And 2, searching beams which meet the target frequency band condition in the space spectrum resources to be calculated.
And substituting the space spectrum resource identifier ntc _ id into an s _ beam table in an srs database, acquiring all beam names beam _ name under the resource, and sequentially reading { freq _ min, freq _ max } (MHz) of each beam _ name, as shown in table 2. And then comparing the frequency band with a target frequency band freq _ need input by a user, if an overlapped frequency band exists, storing the frequency band into an array freq _ list, and performing the next operation as a beam meeting the target frequency band condition in the space spectrum resources, as shown in table 3.
Table 2 found beam sequence
| id | beam_name | freq_min | freq_max |
| 1 | CD | 3420.0 | 4200.0 |
| 2 | KAD | 17700.0 | 21200.0 |
| 3 | KDS | 11460.0 | 12680.0 |
| 4 | KUD | 11460.0 | 12700.0 |
| 5 | CU | 5925.0 | 6665.0 |
| 6 | KAU | 27500.0 | 31000.0 |
| 7 | KUS | 13760.0 | 14500.0 |
| 8 | KUU | 13800.0 | 14500.0 |
TABLE 3 Beam sequence to meet user requirements
| id | beam_name | freq_min | freq_max |
| 1 | KAD | 17700.0 | 21200.0 |
| 2 | KDS | 11460.0 | 12680.0 |
| 3 | KUS | 13760.0 | 14500.0 |
| 4 | KUD | 11460.0 | 12700.0 |
| 5 | KUU | 13800.0 | 14500.0 |
| 6 | KAU | 27500.0 | 31000.0 |
And 3, gridding the region of the earth needing to be subjected to support degree calculation into K grids.
1. According to a target area region calibrated on a map by a user, according to the longitude and latitude of the target area region on the map, a segmentation grid of an external matrix is calculated by using a graphical tool, the region is divided into 100 grid points, and each grid point is identified by a longitude and latitude sequence, as shown in fig. 3.
2. And judging a selection identifier method _ flag of the calculation method, wherein the method _ flag is 1, and then using a demodulation threshold to continue the judgment of the grid points.
And 4, calculating whether each grid point meets the minimum communication requirement of the satellite system downlink by using a demodulation threshold threesold.
And (3) testing whether each grid point meets the lowest communication requirement of a downlink according to the 100 grid points acquired in the step (3) in sequence, setting a mark ok _ flag field in each grid point to indicate whether the grid point meets the requirement, initializing the field to 0, and performing the following operation on each grid point.
For the grid points [ -178.6787,0.9793], the following operations are performed for the beam cycle satisfying the target frequency band condition in each spatial spectrum resource in freq _ list, taking the beam KAD as an example:
1. it is determined whether the mesh point has reached the effective coverage requirement. And if the qualified flag ok _ flag is detected to be 0, continuing the following operation.
2. A path d of the satellite system to the grid point earth station is calculated. The calculation formula is as follows:
wherein
Is the difference between the longitude of the satellite and the grid point earth station and α is the grid point earth station latitude. The bore _ long reading the s _ beam table by using the space spectrum resource identifier ntc _ id obtains that the longitude of the satellite is 130 and the longitude of the earth station is-178.6787, so that the theta is 308.6787. The earth station latitude is 0.9793, from which a distance d of 40148.003 (Km) can be obtained.
3. The beam center frequency f is calculated. Freq _ min corresponding to beam _ name in freq _ list of beam: 17700 and freq _ max:21200, the minimum and maximum frequencies of the beam, calculate the beam center frequency. The calculation formula is as follows:
f＝(freq_min+freq_max)/(2×1000)
this results in a beam center frequency f of 19.45.
4. Calculating the path loss L F . From the path d and the beam center frequency f obtained above, the path loss L from the grid point earth station to the satellite system is obtained F . The calculation formula is as follows:
L F ＝92.45+20lg(d×f)
thereby obtaining a path loss L F Is 210.301.
5. Calculating satellite transmitting power P i . All beam group identifications grp _ id under the beam are obtained by substituting space spectrum resource identifications ntc _ id into grp tables in an srs database, then the beam group identifications grp _ id are substituted into emiss tables in the srs database to obtain transmitting power pwr _ ds _ nbw, and the maximum transmitting power value under the beam is selected as satellite transmitting power P i It was-34.1 dbm.
6. A grid point earth station receive gain is calculated. The contour of the beam, coArea, is computed by bringing the ntc _ id of the spatial spectrum resource and the beam _ name into the GIMs interface as "constraint" [ [18.8,38.8], [19.00,40.00], [20.1,40.1], [20,39], [18.8,38.8] ], "gain":25}, { "constraint" [ [17.8,37.8], [18.00,41.00], [21.1,41.1], [21,38], [17.8,37.8] ], "gain":5} ]. Thus substituting the fields of the contour line coArea and the latitude and longitude coordinates of the meshpoint earth stations [ -178.6787,0.9793] into the GIMs results in a gain value gain of 8.93206882477 for the meshpoint earth stations.
7. Calculating satellite gain G i . All beam group identifications grp _ id are obtained by bringing the spatial spectrum resource identifications ntc _ id into a grp table in the srs database. The maximum receiving antenna gain G corresponding to the satellite is obtained by bringing grp _ id into an e _ as _ stn table in an srs database i Was 41.7.
8. Calculating grid point earth station received power P r . From the path loss L obtained above F Transmitting power P i And grid point geostationary gain G i The received power P of the grid point earth station can be obtained r . The calculation formula is as follows:
P r ＝G i +P i -L F +gain
the received power for grid points-178.6787, 0.9793 is-158.94.
9. It is detected whether the mesh point earth station has reached a minimum communication requirement in this beam. Judging according to the demodulation threshold =18 input by the user, P r If the grid point earth station does not meet the requirement, the next round of detection is carried out.
And step six, counting the number of the grid points reaching the standard in the grid point earth station, and calculating the support degree of a downlink. The ok flag of the 100 mesh point earth stations is cyclically detected, and the num variable is set to record the number of mesh points which reach the downlink communication standard. If ok _ flag of the earth station of the grid point is marked as 1, adding one to the num variable; when ok _ flag is 0, num is unchanged, resulting in num of 36. Finally, the ratio of the number of the grid point earth stations which have reached the standard to the total number of the grid point earth stations is used as the support degree support for the downlink down . The calculation formula is as follows:
this gives a downlink support of 0.36.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (7)
1. A method for calculating support of spatial spectrum resources to a downlink of a satellite communication system, comprising the steps of:
s1, acquiring related calculation parameter information;
s2, searching beams meeting the target frequency band condition in the space spectrum resources to be calculated;
s3, dividing the region grid of the earth region needing to be subjected to support degree calculation into K grid points; judging a selection identifier method _ flag of the calculation method, if the method _ flag is 0, judging a grid point earth station by using a transmitting power spectral density psd required by a user, and turning to a step S4; if the method _ flag is 1, judging the grid point earth station by using a demodulation threshold required by a user, and turning to the step S5;
s4, judging whether each grid point earth station meets the lowest communication requirement of a satellite system downlink by using the transmitting power spectral density required by a user, and turning to the step S6;
s5, calculating whether each grid point earth station meets the lowest communication requirement of a satellite communication system downlink by using a demodulation threshold required by a user, and turning to the step S6;
s6, counting the number of grid point earth stations meeting the minimum communication requirement of a satellite communication system downlink, and calculating the support degree of the downlink;
the calculation parameter information described in step S1 specifically includes a spatial frequency spectrum resource identifier ntc _ id that needs to be calculated, an earth region that needs to be calculated for a support degree, a target frequency band freq _ need, a selection identifier method _ flag for a calculation method, a transmission power spectral density psd required by a user, and a demodulation threshold required by the user.
2. The method for calculating the downlink support of a satellite communication system from spatial spectrum resources according to claim 1, wherein in step S2, according to the spatial spectrum resource identifier ntc _ id, all beams under the resource are obtained, the frequency range of each beam is sequentially read and compared with a target frequency band freq _ need, if there are overlapping frequency bands between the two, the beam information is stored in an array freq _ list, and the beam is used as a beam in the spatial spectrum resource that meets the target frequency band condition.
3. The method for calculating the support of the spatial frequency spectrum resources to the downlink of the satellite communication system according to claim 1, wherein in step S3, the region is uniformly divided into K grid points according to the longitude and latitude of the region on the map, each grid point is provided with an earth station of the satellite communication system, which is called a grid point earth station, and each grid point earth station is identified by a longitude and latitude sequence.
4. The method for calculating the support degree of the spatial spectrum resources to the downlink of the satellite communication system according to claim 1, wherein in step S4, according to the K mesh point earth stations obtained in step S3, it is tested in sequence whether each mesh point earth station satisfies the minimum communication requirement of the downlink, and an identity ok _ flag field is set in each mesh point earth station to indicate whether the mesh point earth station satisfies the requirement, and the identity ok _ flag field is initialized to 0; for each grid point earth station, for each beam meeting the target frequency band condition in each spatial spectrum resource in freq _ list, the following operations are performed:
s41, judging whether the mesh point earth station meets the lowest communication requirement of a downlink, detecting an ok _ flag field of the mesh point earth station, if the ok _ flag field is 1, indicating that the mesh point earth station meets the lowest communication requirement of the downlink, directly ending the operation, and jumping to the next mesh point earth station to continue operating beams of the mesh point earth station; if ok _ flag is 0, continuing to enter step S42;
s42, calculating the path distance d between the satellite and the grid point earth station in the satellite communication system, wherein the calculation formula is as follows:
wherein, theta is the difference between the longitude of the satellite and the grid point earth station, and alpha is the latitude of the grid point earth station; acquiring longitude and latitude coordinates of the satellite by using the space spectrum resource identifier ntc _ id;
s43, calculating the central frequency f of the wave beam; according to the frequency range { freq _ min, freq _ max } of the beam, the beam center frequency is calculated by the formula:
f＝(freq_min+freq_max)/2；
s44, calculating the path loss L F (ii) a Obtaining the path loss L from the earth station of the grid point to the satellite according to the path d and the beam center frequency f F The calculation formula is as follows:
L F ＝92.45+20lg(d×f)；
s45, calculating satellite transmitting power P; according to a beam group identification grp _ id corresponding to a beam, acquiring the maximum transmitting power pwr _ ds _ nbw of the beam group through the grp _ id, and taking the maximum transmitting power pwr _ ds _ nbw as the transmitting power P of the satellite; the beam group identification grp _ id is used for identifying a group of beams with certain same performance under the same spatial frequency spectrum resource identification;
s46, calculating satellite gain G; acquiring corresponding gain according to the beam group identifier grp _ id corresponding to the beam, and taking the gain as the transmission gain G of the satellite;
s47, calculating the Effective Isotropic Radiated Power (EIRP) of the grid point earth station; according to the path loss L F The effective omnidirectional radiation power EIRP is obtained by the satellite transmitting power P and the satellite gain G, and the calculation formula is as follows:
EIRP＝P+G-L F ；
s48, detecting whether the mesh point earth station meets the lowest communication requirement of a satellite communication system downlink under the beam; judging according to the transmitting power spectral density psd required by a user, if the EIRP is more than or equal to the psd, indicating that the earth station of the mesh point meets the lowest communication requirement of a satellite communication system downlink under the wave beam, and setting ok _ flag to be 1; if EIRP < psd, the earth station of the mesh point can not reach the minimum communication requirement of the downlink of the satellite communication system under the beam.
5. The method of calculating support of spatial spectrum resources for a downlink of a satellite communication system according to claim 1,
the step S5 specifically includes:
according to the K grid point earth stations obtained in the step S3, whether each grid point earth station meets the lowest communication requirement of a satellite communication system downlink is calculated in sequence, an identification ok _ flag field is set in each grid point earth station to indicate whether the grid point earth station meets the requirement, and the ok _ flag field is initialized to 0; for each grid point earth station, for each beam meeting the target frequency band condition in each spatial spectrum resource in freq _ list, the following operations are performed:
s51, judging whether the grid point earth station meets the lowest communication requirement of a satellite communication system downlink; detecting an identification ok _ flag field of the mesh point earth station, if the ok _ flag field is 1, indicating that the mesh point earth station meets the lowest communication requirement of a satellite communication system downlink, directly ending the operation, and jumping to the next mesh point earth station to continue operating a beam of the mesh point earth station; if ok _ flag is 0, continuing to step S52;
s52, calculating a path d between a satellite and a grid point earth station in the satellite system; the calculation formula is as follows:
wherein, theta is the difference between the longitude of the satellite and the grid point earth station, and alpha is the latitude of the grid point earth station; acquiring a satellite longitude and latitude coordinate by using a space spectrum resource identifier ntc _ id;
s53, calculating the central frequency f of the wave beam; the beam center frequency is calculated according to the frequency range { freq _ min, freq _ max } of the beam, which is calculated by the formula:
f＝(freq_min+freq_max)/2，
s54, calculating the path loss L F (ii) a Obtaining path loss L from the mesh point earth station to the satellite communication system from the path d and the beam center frequency f F The calculation formula is as follows:
L F ＝92.45+20lg(d×f)；
s55, calculating satellite transmitting power P; according to a beam group identification grp _ id corresponding to a beam, acquiring the maximum transmitting power pwr _ ds _ nbw of the beam group through the grp _ id, and taking the maximum transmitting power pwr _ ds _ nbw as the transmitting power P of the satellite; the beam group identification grp _ id is used for identifying a group of beams with certain same performance under the same spatial frequency spectrum resource identification;
s56, calculating a grid point earth station receiving gain; calculating a contour line coArea of the projection range of the beam according to the space spectrum resource identifier ntc _ id and the projection range of the beam on the earth, and obtaining a receiving gain of the grid point earth station according to the distance between the central point of the projection range and the grid point earth station;
s57, calculating satellite receiving gain G; acquiring corresponding gain according to the beam group identifier grp _ id corresponding to the beam, and taking the gain as satellite receiving gain G;
s58, calculating the receiving power P of the grid point earth station r (ii) a According to the path loss L F The satellite transmitting power P and the grid point earth station gain are obtained to obtain the grid point earth station receiving power P r The calculation formula is as follows:
P r ＝G+P-L F +gain；
s59, detecting whether the earth station of the mesh point meets the lowest communication requirement of a satellite communication system downlink under the beam; judging according to the demodulation threshold required by the user, if P is r If the wave beam is greater than or equal to threshold, the earth station of the grid point meets the lowest communication requirement of a downlink of a satellite communication system under the wave beam, and ok _ flag is set to be 1; if P r If < threshold, it means that the earth station of the grid point does not reach the minimum communication requirement of the downlink of the satellite communication system under the beam.
6. The method for calculating support of spatial spectrum resources to a downlink of a satellite communication system according to any one of claims 4 or 5,
the beam group identity grp _ id is used to identify a group of beams with certain same performance under the same spatial spectrum resource identity.
7. The method for calculating the support of the spatial spectrum resources to the downlink of the satellite communication system according to claim 1, wherein in step S6, for K mesh point earth stations, the ok _ flag field is detected circularly, and the num variable is set to record the number of mesh point earth stations which have reached the minimum communication requirement of the downlink of the satellite communication system; if the ok _ flag field of the grid point earth station is 1, adding 1 to the num variable; num is unchanged when the ok _ flag field of the mesh point earth station is 0; taking the ratio of the number of the mesh point earth stations meeting the minimum communication requirement to the total number of the mesh point earth stations as the support degree support of the space spectrum resource to the satellite communication system downlink up The calculation formula is as follows:
wherein K is the total number of grid points earth stations.
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