CN113376663B - Evaluation method for ground receiving power of actually measured navigation signal - Google Patents
Evaluation method for ground receiving power of actually measured navigation signal Download PDFInfo
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- CN113376663B CN113376663B CN202110516527.XA CN202110516527A CN113376663B CN 113376663 B CN113376663 B CN 113376663B CN 202110516527 A CN202110516527 A CN 202110516527A CN 113376663 B CN113376663 B CN 113376663B
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- 238000011156 evaluation Methods 0.000 title claims abstract description 17
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- 238000005259 measurement Methods 0.000 claims abstract description 11
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- 238000000034 method Methods 0.000 claims description 24
- 238000013461 design Methods 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 12
- 238000012937 correction Methods 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- 238000001228 spectrum Methods 0.000 claims description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Radar, Positioning & Navigation (AREA)
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Abstract
The invention relates to an evaluation method of ground received power of an actually measured navigation signal, which is characterized in that a national time service center acquires signals with 40 meters high gain to receive GNSS navigation signals, and software estimates the ground received power of satellites. Simulating a GNSS system signal system by adopting an analog signal source to realize the estimation of a receiving channel; fitting the acquired data result data model by using a spectrometer to realize a mapping function; finally, ground receiving power measurement of single-branch single component of the navigation signal is realized, and the power evaluation precision of the downlink navigation signal is improved to 0.1dB.
Description
Technical Field
The invention belongs to the technical field of ground received power calculation methods, and particularly relates to an evaluation method of ground received power of an actually measured navigation signal.
Background
For the satellite overall design stage, the characteristics of ambiguity, subjectivity and the like of the system design target lead to a great deal of uncertainty of design parameters of the overall design of the satellite system.
Satellite overall design and mission analysis involves multidisciplinary design, analysis content, and a variety of design factors that must be considered in engineering practice, and is a comprehensive, complex system engineering. The values selected by the overall parameters of the overall satellite design have decisive roles on the overall performance of the satellite, the reliability of the satellite system, the cost and the development difficulty of the satellite system.
Disclosure of Invention
The invention aims to solve the problems and provide an evaluation method of the ground receiving power of the actually measured navigation signal, which adopts an analog signal source to simulate a GNSS system signal system so as to realize the estimation of a receiving channel; and fitting the acquired data result data model by using a spectrometer to realize a mapping function of the acquired data result data model, and realizing ground receiving power measurement of single-branch single component of the navigation signal.
In order to achieve the above purpose, the present invention provides the following technical solutions: an evaluation method of ground receiving power of an actual measurement navigation signal adopts an analog signal source to simulate the constitution of a GNSS system signal so as to realize the estimation of a receiving channel; and fitting the acquired data result data model by using a spectrometer to realize a mapping function, so as to realize ground receiving power measurement of single-branch single component of the navigation signal, and improve the power evaluation precision of the downlink navigation signal to 0.1dB.
Priority is given to: the method for calculating the ground receiving power of the navigation signal comprises the following steps:
(1) Definition of downlink signal ground receiving power index:
in the Beidou ICD, when the satellite elevation angle is larger than 5 degrees, the right-hand circularly polarized antenna of the receiver near the earth surface is 0dBi gain or the linearly polarized antenna is 3 dBi gain, and the minimum power level of the navigation signal transmitted by the satellite reaching the output end of the antenna of the receiver reaches the index requirement.
(2) Ground received total power calculation
(1) The measuring method of the spectrometer comprises the following steps: the method comprises the steps that a frequency spectrograph is used for calculating ground receiving power, in the ground testing process, a triplexer outlet is connected with a testing cable, the triplexer outlet is connected with the frequency spectrograph, a satellite sends out a triplex spread spectrum signal, and the frequency spectrograph is used for testing signal power spectrum and channel power;
measuring the power distribution condition of the working bandwidth of the GNSS signals, wherein the spectrometer is set as RBW: measuring the power of a 1KHz channel in the integral bandwidth of each frequency point at 1 KHz;
(2) the data mapping calculation method of the acquisition equipment and the spectrometer comprises the following steps: determining a mapping center by using Beidou GEO; simulating a signal system of each frequency point of the GNSS by using a signal source, and respectively calculating a spectrometer and acquiring equipment data in the working bandwidth; mapping and modeling the measured data of the spectrometer and the software calculation data, wherein a mapping function formula is as follows:
(3) the method for estimating the collected data software algorithm comprises the following steps: design the interval asFirst read out +.>Second-long acquisition data set as +.>Then:
taking the logarithm:
acquisition device map correctionMeasuring the difference between the acquisition card and the spectrometer, and calculating a mapping function;
after the mapping correction of the acquisition equipment:
taking outThe first half is summed cyclically:
antenna pointing error"is the EIRP difference caused by the antenna itself, is a model related to satellite position:
antenna loss correction, after antenna pointing error correction:
collecting data flow with time being T seconds, calculating example element time intervalFor 1 second, the average value is the ground received total power.
(2) Signal component power ratio calculation
True signal estimation:
design the interval asFirst read the i +.>The second-long acquisition data is set as +.>，/>Sampling points with a second length, and after DC removal and band-pass filtering operation, calculating the average power of the sampling points:
let the signal component kCorrelation amplitude->N is the tracking cycle number, and the cycle period is +.>Second, tracking data streams is often:
t=Δt×n seconds.
Calculating the average correlation peak amplitude of the signal:
sample variance of correlation peak amplitude:
signal power of the kth component:
average it to each sampling point:
thus the power ratio occupied by the Kth signal componentThe method comprises the following steps:
(3) Power allocation calculation for each signal component
Knowing that the total power of ground received signals at a certain frequency point isAnd the respective signal components occupy a proportion +.>Ground reception power of each signal component>The method comprises the following steps:
(4) Precision evaluation (0.1 dB)
Collecting 100s long data, calculating once per second, and estimatingProbability distribution, less than 0.1dB.
Compared with the prior art, the invention has the beneficial effects that:
a method for evaluating the ground receiving power of an actually measured navigation signal, which is used for receiving GNSS navigation signals by a 40-meter high-gain acquisition signal of a national time service center, and estimating the ground receiving power of a satellite by software. Simulating a GNSS system signal system by adopting an analog signal source to realize the estimation of a receiving channel; the mapping function is realized by adopting a spectrometer to fit the acquired data result and the data model; finally, ground receiving power measurement of single-branch single component of the navigation signal is realized, and the power evaluation precision of the downlink navigation signal is improved to 0.1dB.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only for more clearly illustrating the embodiments of the present invention or the technical solutions in the prior art, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a spectrometer of the present invention for measuring ground received power;
FIG. 2 is a schematic diagram of a deterministic map center according to the present invention;
FIG. 3 is a diagram of mapping data measurement according to the present invention;
FIG. 4 is a schematic diagram of a mapping curve according to the present invention.
Detailed Description
The invention will be further described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the invention, in order to enable those skilled in the art to better understand the technical solutions of the invention.
An evaluation method of ground receiving power of an actual measurement navigation signal adopts an analog signal source to simulate the constitution of a GNSS system signal so as to realize the estimation of a receiving channel; and fitting the acquired data result data model by using a spectrometer to realize a mapping function, so as to realize ground receiving power measurement of single-branch single component of the navigation signal, and improve the power evaluation precision of the downlink navigation signal to 0.1dB.
The method for calculating the ground receiving power of the navigation signal comprises the following steps:
(1) Definition of downlink signal ground receiving power index:
in the Beidou ICD, when the satellite elevation angle is larger than 5 degrees, the right-hand circularly polarized antenna of the receiver near the earth surface is 0dBi gain or the linearly polarized antenna is 3 dBi gain, and the minimum power level of the navigation signal transmitted by the satellite reaching the output end of the antenna of the receiver reaches the index requirement.
(2) Ground received total power calculation
(1) The measuring method of the spectrometer comprises the following steps: the method comprises the steps that a frequency spectrograph is used for calculating ground receiving power, in the ground testing process, a triplexer outlet is connected with a testing cable, the triplexer outlet is connected with the frequency spectrograph, a satellite sends out a triplex spread spectrum signal, and the frequency spectrograph is used for testing signal power spectrum and channel power;
measuring the power distribution condition of the working bandwidth of the GNSS signals, wherein the spectrometer is set as RBW: measuring the power of a 1KHz channel in the integral bandwidth of each frequency point at 1 KHz;
(2) the data mapping calculation method of the acquisition equipment and the spectrometer comprises the following steps: determining a mapping center by using Beidou GEO; simulating a signal system of each frequency point of the GNSS by using a signal source, and respectively calculating a spectrometer and acquiring equipment data in the working bandwidth; mapping and modeling the measured data of the spectrometer and the software calculation data, wherein a mapping function formula is as follows:
(3) the method for estimating the collected data software algorithm comprises the following steps: design the interval asFirst read out +.>Second-long acquisition data set as +.>Then:
taking the logarithm:
acquisition device map correctionMeasuring the difference between the acquisition card and the spectrometer, and calculating a mapping function;
after the mapping correction of the acquisition equipment:
taking outThe first half is summed cyclically:
antenna pointing error"is the EIRP difference caused by the antenna itself, is a model related to satellite position:
antenna loss correction, after antenna pointing error correction:
collecting data flow with time being T seconds, calculating example element time intervalFor 1 second, the average value is the ground received total power.
(3) Signal component power ratio calculation
True signal estimation:
design the interval asFirst read the i +.>The second-long acquisition data is set as +.>，/>Sampling points with a second length, and after DC removal and band-pass filtering operation, calculating the average power of the sampling points:
let the signal component kCorrelation amplitude->N is the tracking cycle number, the cycle period is Deltat seconds, and the tracking data flow is always:
t=Δt×n seconds.
Calculating the average correlation peak amplitude of the signal:
sample variance of correlation peak amplitude:
signal power of the kth component:
average it to each sampling point:
thus the power ratio occupied by the Kth signal componentThe method comprises the following steps:
(4) Power allocation calculation for each signal component
Knowing that the total power of ground received signals at a certain frequency point isAnd the respective signal components occupy a proportion +.>Ground reception power of each signal component>The method comprises the following steps:
(5) Precision evaluation (0.1 dB)
Collecting 100s long data, calculating once per second, and estimatingProbability distribution, less than 0.1dB.
A method for evaluating the ground receiving power of an actually measured navigation signal, which is used for receiving GNSS navigation signals by a 40-meter high-gain acquisition signal of a national time service center, and estimating the ground receiving power of a satellite by software. Simulating a GNSS system signal system by adopting an analog signal source to realize the estimation of a receiving channel; fitting the acquired data result and the data model by adopting a spectrometer to realize a mapping function; and finally, ground receiving power measurement of single-branch single component of the navigation signal is realized, and the power evaluation precision of the downlink navigation signal is improved to 0.1dB.
The invention is not described in detail in the prior art.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (1)
1. An evaluation method for ground receiving power of an actual measurement navigation signal is characterized by comprising the following steps: simulating GNSS system signal constitution by adopting an analog signal source to realize the estimation of a receiving channel; the mapping function of the collected data result data model fitting is realized by adopting a frequency spectrograph, the ground receiving power measurement of the single-branch single component of the navigation signal is realized, and the power evaluation precision of the downlink navigation signal is improved to 0.1 dB;
the method for calculating the ground receiving power of the navigation signal comprises the following steps:
(1) Definition of downlink signal ground receiving power index:
the method comprises the steps that in the Beidou ICD, when the satellite elevation angle is larger than 5 degrees, the right-hand circularly polarized antenna of a receiver near the earth surface is 0dBi gain or the linearly polarized antenna is 3 dBi gain, and the minimum power level of a navigation signal transmitted by the satellite reaching the output end of the antenna of the receiver reaches the index requirement;
(2) Ground received total power calculation
(1) The measuring method of the spectrometer comprises the following steps: the method comprises the steps that a frequency spectrograph is used for calculating ground receiving power, in the ground testing process, a triplexer outlet is connected with a testing cable, the triplexer outlet is connected with the frequency spectrograph, a satellite sends out a triplex spread spectrum signal, and the frequency spectrograph is used for testing signal power spectrum and channel power;
measuring the power distribution condition of the working bandwidth of the GNSS signals, wherein the spectrometer is set as RBW: measuring the power of a 1KHz channel in the integral bandwidth of each frequency point at 1 KHz;
(2) the data mapping calculation method of the acquisition equipment and the spectrometer comprises the following steps: determining a mapping center by using Beidou GEO; simulating a signal system of each frequency point of the GNSS by using a signal source, and respectively calculating a spectrometer and acquiring equipment data in the working bandwidth; mapping and modeling the measured data of the spectrometer and the software calculation data, wherein a mapping function formula is as follows:
；
(3) the method for estimating the collected data software algorithm comprises the following steps: design the interval asFirst read out +.>Second-long acquisition data set as +.>Then:
；
taking the logarithm:
；
acquisition device map correctionMeasuring the difference between the acquisition card and the spectrometer, and calculating a mapping function;
after the mapping correction of the acquisition equipment:
；
taking outThe first half is summed cyclically:
；
antenna pointing error"is the EIRP difference caused by the antenna itself, is a model related to satellite position:
；
antenna loss correction, after antenna pointing error correction:
；
collecting data flow which is always T seconds, calculating an example element time interval delta T to be 1 second, wherein the average value of the example element time interval delta T is the ground receiving total power;
(3) Signal component power ratio calculation:
true signal estimation:
design the interval asFirst read the i +.>The second-long acquisition data is set as +.>，/>Sampling points with a second length, and after DC removal and band-pass filtering operation, calculating the average power of the sampling points:
；
let the signal component kCorrelation amplitude->N is the tracking cycle number, the cycle period is Deltat seconds, and the tracking data flow is always:
t=Δt×n seconds;
calculating the average correlation peak amplitude of the signal:
；
sample variance of correlation peak amplitude:
；
signal power of the kth component:
；
average it to each sampling point:
；
thus the power ratio occupied by the Kth signal componentThe method comprises the following steps:
；
(4) Calculating the power distribution of each signal component:
knowing that the total power of ground received signals at a certain frequency point isAnd the respective signal components occupy a proportion +.>Ground reception power of each signal component>The method comprises the following steps:
；
(5) Precision evaluation:
collecting 100s long data, calculating once every second, and estimating 1Probability distribution, less than 0.1dB.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103033824A (en) * | 2012-12-18 | 2013-04-10 | 中国科学院国家授时中心 | High-performance navigational satellite space signal quality assessment method |
| CN108519608A (en) * | 2018-03-09 | 2018-09-11 | 中国航天电子技术研究院 | A kind of satellite navigation based on array antenna is anti-interference and surveys attitude positioning method |
| CN109100757A (en) * | 2018-09-26 | 2018-12-28 | 中国科学院国家授时中心 | A kind of method for evaluating quality of New Satellite navigation signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033824A (en) * | 2012-12-18 | 2013-04-10 | 中国科学院国家授时中心 | High-performance navigational satellite space signal quality assessment method |
| CN108519608A (en) * | 2018-03-09 | 2018-09-11 | 中国航天电子技术研究院 | A kind of satellite navigation based on array antenna is anti-interference and surveys attitude positioning method |
| CN109100757A (en) * | 2018-09-26 | 2018-12-28 | 中国科学院国家授时中心 | A kind of method for evaluating quality of New Satellite navigation signal |
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