CN113783595A - Multi-antenna optimized switching method for satellite communication processor - Google Patents
Multi-antenna optimized switching method for satellite communication processor Download PDFInfo
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- CN113783595A CN113783595A CN202111122635.5A CN202111122635A CN113783595A CN 113783595 A CN113783595 A CN 113783595A CN 202111122635 A CN202111122635 A CN 202111122635A CN 113783595 A CN113783595 A CN 113783595A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004891 communication Methods 0.000 title claims abstract description 26
- 230000001131 transforming effect Effects 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0891—Space-time diversity
- H04B7/0897—Space-time diversity using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a multi-antenna optimized switching method for a satellite communication processor, which comprises the following steps: s1: calculating the signal beam direction; s2: determining the coverage angle range of the antenna; s3: antenna beam switching criteria are determined. The invention greatly improves the communication effect in the antenna switching process by optimizing the antenna beam coverage angular domain and optimizing the antenna switching strategy.
Description
Technical Field
The invention belongs to the technical field of satellite communication processors, and relates to a multi-antenna optimized switching method of a satellite communication processor.
Background
The satellite communication antenna installed on the aircraft carrier generally adopts a common-mode design, the coverage angle of each antenna is limited, and a plurality of antennas are usually arranged for combined use to realize signal coverage of a full airspace. In conventional designs, the process of beam switching typically causes a temporary interruption in the communication signal.
Disclosure of Invention
Objects of the invention
The purpose of the invention is: in order to improve the effect of satellite communication, a multi-antenna optimized switching method of a satellite communication processor is provided, antenna wave beams are optimized to cover an angular domain, an antenna switching strategy is optimized, and the purpose of improving the communication effect in the antenna switching process is achieved.
(II) technical scheme
In order to solve the above technical problem, the present invention provides a method for switching multiple antennas of a satellite communication processor, comprising the following steps:
s1: computing signal beam pointing
Calculating the signal beam direction of an antenna coordinate system according to the satellite position information, the aircraft attitude and the position information; transforming longitude, latitude and altitude coordinate systems of the aircraft and the satellite into a rectangular coordinate system which takes the geocenter as an origin, a straight line of a longitude 0 point on the equator pointed by the geocenter as an X axis and a straight line of the geocenter pointing to the north pole as a Z axis, namely converting a spherical coordinate and a rectangular coordinate; and then, transforming the geocentric rectangular coordinate system where the satellite is located into a rectangular coordinate system where the satellite is located and the aircraft is used as the center by carrying out coordinate rotation transformation on the longitude, the latitude, the course angle, the pitch angle and the rolling angle of the aircraft. And calculating the angle information of the satellite relative to the aircraft through rectangular coordinates in a rectangular coordinate system taking the aircraft as a center, wherein the angle information is the propagation direction of the two-party communication electromagnetic wave, and an antenna with the maximum gain in the direction needs to work so as to obtain the maximum gain of the signal.
S2: determining antenna coverage angular range
The coverage range of the airspace of each antenna is expanded, and the angle is overlapped at the corner region junction of two adjacent antennas, so that the two antennas can effectively receive incoming waves when the incoming waves are incident in the corner region junction direction.
S3: determining beam switching criteria
The antenna beam switching process is as follows:
firstly, calculating the incoming wave direction of a satellite signal, and if the incoming wave direction is in the central angular domain of a certain antenna, directly setting the antenna as an effective working antenna; if the incoming wave direction is in the edge angular domain of the antenna, starting a boundary judgment mode: respectively calculating the incoming wave signal field strengths of different antenna receiving channels, comparing the signal field strengths of adjacent antennas, and taking the antenna with the large signal field strength as the current effective working antenna.
Continuously calculating the signal field intensity of different antennas in the flight process, and judging whether the field intensity threshold value of antenna switching is reached: if the signal field intensity under the adjacent position antenna channel exceeds the switching threshold value of the current antenna, the new position antenna is switched to be the effective working antenna, otherwise, the current antenna is kept to be the effective working antenna, and the field intensity calculation and comparison process is continued.
(III) advantageous effects
According to the multi-antenna optimized switching method of the satellite communication processor, the communication effect is greatly improved in the antenna switching process by optimizing the antenna beam coverage angle domain and optimizing the antenna switching strategy.
Drawings
Fig. 1 is a schematic diagram of angular coverage for a four-antenna system.
FIG. 2 is a flow chart of the method of the present invention.
Fig. 3 is a schematic diagram of the incoming wave direction of a signal.
FIG. 4 is a schematic diagram of field strength hysteresis threshold design.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The optimized multi-antenna switching method for the satellite communication processor comprises the following steps:
s1: computing signal beam pointing
Calculating the signal beam direction of an antenna coordinate system according to the satellite position information, the aircraft attitude and the position information; transforming longitude, latitude and altitude coordinate systems of the aircraft and the satellite into a rectangular coordinate system which takes the geocenter as an origin, a straight line of a longitude 0 point on the equator pointed by the geocenter as an X axis and a straight line of the geocenter pointing to the north pole as a Z axis, namely converting a spherical coordinate and a rectangular coordinate; and then, transforming the geocentric rectangular coordinate system where the satellite is located into a rectangular coordinate system where the satellite is located and the aircraft is used as the center by carrying out coordinate rotation transformation on the longitude, the latitude, the course angle, the pitch angle and the rolling angle of the aircraft. And calculating the angle information of the satellite relative to the aircraft through rectangular coordinates in a rectangular coordinate system taking the aircraft as a center, wherein the angle information is the propagation direction of the two-party communication electromagnetic wave, and an antenna with the maximum gain in the direction needs to work so as to obtain the maximum gain of the signal.
S2: determining antenna coverage angular range
The coverage range of the airspace of each antenna is expanded, and the angle is overlapped at the corner region junction of two adjacent antennas, so that the two antennas can effectively receive incoming waves when the incoming waves are incident in the corner region junction direction.
Taking a four-antenna system as an example, the coverage of each antenna in the periphery area in the conventional method should be 90 °. To ensure that the signals overlap in adjacent angular regions, the angular coverage of each antenna may be extended by 10 ° in both clockwise and counterclockwise directions, as shown in fig. 1.
S3: determining beam switching criteria
The antenna beam switching process is as follows:
firstly, calculating the incoming wave direction of a satellite signal, and if the incoming wave direction is in the central angular domain of a certain antenna, directly setting the antenna as an effective working antenna; if the incoming wave direction is in the edge angular domain of the antenna, starting a boundary judgment mode: respectively calculating the incoming wave signal field strengths of different antenna receiving channels, comparing the signal field strengths of adjacent antennas, and taking the antenna with the large signal field strength as the current effective working antenna.
Continuously calculating the signal field intensity of different antennas in the flight process, and judging whether the field intensity threshold value of antenna switching is reached: if the signal field intensity under the adjacent position antenna channel exceeds the switching threshold value of the current antenna, the new position antenna is switched to be the effective working antenna, otherwise, the current antenna is kept to be the effective working antenna, and the field intensity calculation and comparison process is continued.
Taking a four-antenna system as an example, as shown in fig. 2, the specific operation steps of antenna beam switching are as follows:
a. pre-decision
And calculating the incoming wave direction of the signal according to the step S2, respectively obtaining the included angle between the incoming wave direction of the signal and the central normal angle of the 4 pairs of antenna coordinate systems, and making a pre-decision according to the degree of the included angle. If the included angle is less than or equal to 70 degrees, the current antenna is directly set as a working antenna, and a subsequent boundary judgment mode is not entered; if the included angle is greater than 70 °, the boundary determination mode b is entered, as shown in fig. 3.
b. Calculating the field intensity P of the incoming wave signal to determine the effective working antenna
And respectively calculating the field intensity of incoming wave signals in different antenna receiving channels, and selecting the antenna with the maximum field intensity as the current effective working antenna.
c. Comparing and switching hysteresis threshold value P according to signal field intensityTHDetermining whether to switch the antenna
Respectively calculating signal field intensity values under the current antenna and antenna receiving channels at other positions: if the difference value between the field intensity values of the antenna at the new position and the antenna at the current position is smaller than the switching hysteresis threshold value PTHIf so, keeping the current antenna as an effective working antenna; if the difference value between the field intensity values of the antenna at the new position and the antenna at the current position is greater than the switching hysteresis threshold value PTHThen the new position antenna is set to the currently active working antenna.
The threshold setting strategy is to avoid repeated ping-pong switching when the incoming wave direction of the signal is at the boundary of two antennas, and to influence the normal reception of the signal. The field strength hysteresis threshold design is shown in fig. 4.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A multi-antenna optimized switching method for a satellite communication processor is characterized by comprising the following steps:
s1: calculating the signal beam direction;
s2: determining the coverage angle range of the antenna;
s3: antenna beam switching criteria are determined.
2. The method for optimized switching of multiple antennas of a satellite communication processor according to claim 1, wherein in step S1, the signal beam pointing direction of the antenna coordinate system is calculated according to the satellite position information, the aircraft attitude and the position information.
3. The satellite communications handler multi-antenna optimized handoff method of claim 2, in step S1, the longitude, latitude, and altitude coordinate systems of the aircraft and the satellite are first converted into a rectangular coordinate system in which the centroid is the origin, the straight line from the centroid to the longitude 0 point on the equator is the X axis, and the straight line from the centroid to the north pole is the Z axis, then transforming the geocentric rectangular coordinate system of the satellite into the rectangular coordinate system of the satellite by carrying out coordinate rotation transformation on the longitude, the latitude, the course angle, the pitch angle and the rolling angle of the aircraft, the angular information of the satellite with respect to the aircraft is calculated by means of cartesian coordinates in a cartesian coordinate system centered on the aircraft, the angle information is the propagation direction of the electromagnetic wave of the two-party communication, so that the antenna with the maximum gain in the direction works to obtain the maximum gain of the signal.
4. The method for optimized switching of multiple antennas of a satellite communication processor according to claim 3, wherein in step S2, the spatial coverage of each antenna is expanded, and a part of the angle is overlapped at the intersection of the angular domains of two adjacent antennas, so as to ensure that both antennas can receive the incoming wave effectively when the incoming wave is incident in the direction of the intersection of the angular domains.
5. The method as claimed in claim 4, wherein in step S3, when switching antenna beams, the incoming wave direction of a satellite signal is first calculated, and if the incoming wave direction is in the central angle domain of an antenna, the antenna is directly set as an active working antenna; if the incoming wave direction is in the edge angular domain of the antenna, starting a boundary judgment mode: respectively calculating the incoming wave signal field strengths of different antenna receiving channels, comparing the signal field strengths of adjacent antennas, and taking the antenna with the large signal field strength as the current effective working antenna.
6. The method as claimed in claim 5, wherein in step S3, the signal field strengths of different antennas are continuously calculated during the flight, and it is determined whether the field strength threshold for antenna switching is reached, if the signal field strength in the adjacent antenna path exceeds the switching threshold of the current antenna, the new antenna is switched to be the active working antenna, otherwise, the current antenna is kept to be the active working antenna, and the field strength calculation and comparison process is continued.
7. The method for optimized handoff of multiple antennas of a satellite communication processor according to claim 6, wherein in step S2, when the multiple antennas are a four-antenna system, the coverage of each antenna in the peripheral area is 90 °, and the angular coverage of each antenna is extended by 10 ° in both clockwise and counterclockwise directions.
8. The method according to claim 7, wherein in step S3, in the four-antenna system, the incoming wave direction of the signal is calculated, the included angles between the incoming wave direction of the signal and the central normal angles of the 4 antenna coordinate systems are obtained, and the degree of the included angle is used as a pre-decision; if the included angle is less than or equal to 70 degrees, the current antenna is directly set as a working antenna, and a subsequent boundary judgment mode is not entered; if the included angle is larger than 70 degrees, entering a boundary judgment mode; the boundary judgment mode is as follows: and respectively calculating the field intensity of incoming wave signals in different antenna receiving channels, and selecting the antenna with the maximum field intensity as the current effective working antenna.
9. The method for optimized switching of multiple antennas of a satellite communication processor as claimed in claim 8, wherein the criterion for determining whether to switch the antennas in step S3 is: respectively calculating signal field intensity values under the current antenna and antenna receiving channels at other positions: if the antenna is in the new positionThe difference value of the field intensity values of the antennas at the current position is smaller than a switching hysteresis threshold value PTHIf so, keeping the current antenna as an effective working antenna; if the difference value between the field intensity values of the antenna at the new position and the antenna at the current position is greater than the switching hysteresis threshold value PTHThen the new position antenna is set to the currently active working antenna.
10. Use of a multi-antenna optimized handover method based on a satellite communication handler according to any of claims 1-9 in the technical field of satellite communication handlers.
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| CN115276773A (en) * | 2022-08-02 | 2022-11-01 | 天津津航计算技术研究所 | Unmanned aerial vehicle-mounted omnibearing satellite signal tracking device and method |
| CN115333596A (en) * | 2022-10-13 | 2022-11-11 | 环宇佳诚科技(北京)有限公司 | Satellite communication system for aircraft and antenna array selection method |
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