CN107276643B - Mobile communication satellite multi-beam carrier-to-interference ratio ground test system and method - Google Patents
Mobile communication satellite multi-beam carrier-to-interference ratio ground test system and method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
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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
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H04B7/155—Ground-based stations
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Abstract
A mobile communication satellite multi-beam carrier-to-interference ratio ground test system and method, the system includes power, control module, multi-channel signal source, transmitting antenna simulator, frequency spectrograph; the power supply supplies power to the control module, the multi-channel signal source, the transmitting antenna simulator and the frequency spectrograph, the multi-channel signal source provides test signals for a tested piece, the transmitting antenna simulator realizes the simulation of the response of the reflector and the feed source in the large-scale multi-beam antenna to the signals, the control module controls the phase shift and attenuation parameters of the phase shift and attenuation components in the transmitting antenna simulator, and the frequency spectrograph is used for reading the level of the output test signals. The ground test method mainly aims at the mobile communication satellite load using the large-scale multi-beam antenna, and can simulate the response of the large-scale multi-beam antenna feed source and the reflector through the transmitting antenna simulator to realize the ground test of the mobile communication satellite multi-beam load carrier-to-interference ratio.
Description
Technical Field
The invention relates to a mobile communication satellite multi-beam load beam carrier-to-interference ratio ground test system and a mobile communication satellite multi-beam load beam carrier-to-interference ratio ground test method, which are suitable for mobile communication satellite multi-beam load beam carrier-to-interference ratio ground test and belong to the technical field of mobile communication satellite effective loads.
Background
The multi-beam load based on the reflector multi-beam antenna is the core technology of a stationary orbit mobile communication satellite, the multi-beam load comprises a transponder, a beam forming device, a feed source array, a large-caliber antenna and the like, and the size of the large-caliber antenna can reach ten meters or tens of meters, as shown in fig. 2.
In order to improve the utilization efficiency of frequency resources, a frequency multiplexing technology is generally adopted, and commonly used technologies include 7-color multiplexing and 4-color multiplexing.
Because of side lobes of the beams, mutual interference exists between the same-frequency beams, namely, the carrier-to-interference ratio (C/I) between the same-frequency beams is a key parameter influencing the system capacity and the communication quality.
Literature [ Sudhakar K.Rao, Desibn and Analysis of Multiple Beam Reflector antennae, IEEE antennae and Propagation Magazine, Vpl.41, No.4, August 1999]The C/I of each wave beam at a certain point can be calculated by researching the C/I of the multi-beam antenna, and providing the definition of the C/I between the same-frequency wave beams of the multi-beam antenna and a calculation method, wherein the provided model and formula can calculate the C/I of each wave beam at a certain point (figure 4), and the middle wave beam 0 is arranged at the point
The above C/I calculation formula is:
wherein P isk、
Respectively representing the output power of the i-carrier of the beam and the point
And (c) a gain of (c).
Because a large-scale deployable antenna is adopted, the actual measurement of the C/I of the load under the existing field condition is difficult in the development stage, the radiation data of the feed array is tested by adopting a semi-physical method at present, the radiation data is substituted into commercial software Grasp to calculate the far fields of all wave beams, and the C/I is calculated by using a sum method model provided by the documents. This method is also currently common.
The C/I given by this method generally does not truly describe the performance of the system, since the beam test cannot take into account the intermodulation in the active device when multiple carriers in multiple beams using the same frequency are operating simultaneously.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the system and the method overcome the defects of the prior art, provide the ground test system and the ground test method for the mobile communication satellite multi-beam load carrier-to-interference ratio, realize the ground test of the mobile communication satellite multi-beam load C/I by adopting a large multi-beam antenna, and improve the comprehensiveness and the accuracy of the test.
The technical solution of the invention is as follows:
a mobile communication satellite multi-beam carrier-to-interference ratio ground test system comprises: the device comprises a power supply, a control module, a multi-channel signal source, a transmitting antenna simulator and a frequency spectrograph;
the power supply supplies power to the control module, the multi-channel signal source, the transmitting antenna simulator and the frequency spectrograph, the multi-channel signal source provides a test signal for the tested piece, and the tested piece outputs excitation signals of M paths of feed sources to the transmitting antenna simulator for forming multi-beam; the transmitting antenna simulator realizes the simulation of the response of the reflector and the feed source in the large-scale multi-beam antenna to the signals according to the received M paths of feed source exciting signals, and the control module realizes the simulation of the response of the reflector and the feed source in the large-scale multi-beam antenna to the signals according to different directions
The response of the lower feed source and the reflector to the feed source excitation signal controls the work of the transmitting antenna simulator, the frequency spectrograph is used for reading the level of the test signal output by the transmitting antenna simulator, and M is the number of the feed sources of the mobile communication satellite multi-beam load.
The multichannel signal source outputs K paths of constant amplitude signals with frequency interval of 100KHz, and K is the number of beams with the same frequency in the mobile communication satellite multi-beam load.
The tested piece is a transponder channel and a beam forming device in the mobile communication satellite multi-beam load.
The transmitting antenna simulator comprises an M-path variable phase-shifting component, an attenuation component and a power combiner;
the variable phase-shifting component performs phase-shifting processing on M paths of feed source excitation signals output by the tested piece according to phase-shifting parameters provided by the control module, the attenuation component performs attenuation processing on signals after phase-shifting processing according to attenuation parameters provided by the control module, and the power combiner performs power combination on the M paths of signals after attenuation processing to generate output signals of the transmitting antenna simulator, namely test signals.
The test signal refers to the azimuth of the K paths of wave beams output by the transmitting antenna simulator
Of the signal of (1).
The mth path variable phase-shifting attenuation component in the transmitting antenna simulator is in azimuth
The phase shift and the attenuation quantity of the antenna are equal to that when the mth path feed source is excited in unit 1, the far field of the antenna is in the azimuth
Electric field value of
I.e.:
wherein A ism,i、Φm,iThe amplitude and phase of the electric field, respectively.
Amplitude and phase A of electric fieldm,i、Φm,iThe precision of the attenuation module meets +/-0.5 dB and +/-10 degrees, and the attenuation range of the attenuation module is 0-35 dB.
A test method realized based on the mobile communication satellite multi-beam carrier-to-interference ratio ground test system comprises the following steps:
step 1: the multi-carrier signal source outputs K paths of constant amplitude signals S1 and S2 … … SK with frequency interval of 100KHz, the same frequency carrier signals used for equivalent simultaneous working are connected to a wave beam input port corresponding to a tested piece, a duplexer of the tested piece is disconnected with a feed source, and the duplexer is connected with an input port of the transmitting antenna simulator;
step 2: the control module controls the phase shift parameter and attenuation parameter A of the transmitting antenna simulatorm,i、Φm,iAt a position
And step 3: the spectrometer is connected with an output port of the transmitting antenna simulator, and output power data S1, i, S2, i … … SK, i corresponding to S1 and S2 … … SK are respectively read and recorded on the spectrometer;
and 4, step 4: calculating the k-th beam at
Carrier to interference ratio of
And 5: and (4) repeating the steps 2 to 4 to finish the C/I test of all the K wave beams to be tested at all the points.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention can realize the ground test of the mobile communication satellite multi-beam load C/I by adopting the large multi-beam antenna, can accurately test and verify the C/I of the multi-beam load before the satellite is transmitted, and improves the timeliness, the comprehensiveness and the accuracy of the test.
(2) The test system and the test method provided by the invention control the system to work through the control module, and the C/I can be obtained without testing each beam pattern in the antenna, so that the test efficiency is greatly improved compared with the prior art.
(3) The invention realizes the simulation of the response of the reflector and the feed source in the large-scale multi-beam antenna to signals through a group of phase-shifting and attenuating components and the power synthesizer, and provides the design requirements of the phase-shifting and attenuating components.
Drawings
FIG. 1 is a schematic diagram of a system architecture according to the present invention;
fig. 2 is a schematic block diagram of a mobile communication satellite multi-beam loading scheme in which the present invention may be used;
fig. 3 is an equivalent block diagram of the multi-beam load of fig. 2;
FIG. 4 is a schematic diagram of a C/I calculation method for co-frequency beams in the literature;
FIG. 5 is a schematic diagram of a transmit antenna simulator in accordance with the present invention;
FIG. 6 shows the C/I design results of the embodiment;
FIG. 7 shows the results of the test using the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The invention provides a mobile communication satellite multi-beam load beam carrier-to-interference ratio ground test system and a method, which are used for testing the carrier-to-interference ratio of a mobile communication satellite multi-beam load beam (shown in figure 2) on the ground;
as shown in fig. 1, the ground test system of the present invention includes a power supply, a control module, a multi-channel signal source, a transmitting antenna simulator and a frequency spectrograph;
power supply as control module and multi-wayThe multi-channel signal source provides a test signal for a tested piece, and the tested piece outputs excitation signals of M paths of feed sources to the transmitting antenna simulator for forming multiple beams; the transmitting antenna simulator realizes the simulation of the response of the reflector and the feed source in the large-scale multi-beam antenna to the signals according to the received M paths of feed source exciting signals, and the control module realizes the simulation of the response of the reflector and the feed source in the large-scale multi-beam antenna to the signals according to different directions
The response of the lower feed source and the reflector to the feed source excitation signal controls the work of the transmitting antenna simulator, the frequency spectrograph is used for reading the level of a test signal output by the transmitting antenna simulator, and M is the number of the feed sources of the mobile communication satellite multi-beam load;
the multi-channel signal source is a universal multi-channel signal source and can output K paths of constant-amplitude signals with frequency interval of 100KHz, and K is the number of beams with the same frequency in the multi-beam load of the mobile communication satellite; k paths of test signals output by a multi-channel signal source enter a tested piece (a transponder channel and beam forming equipment in a mobile communication satellite multi-beam load (as shown in figures 2 and 3), the tested piece can be equivalent to a network with K paths of input and M paths of output, and the tested piece outputs excitation signals of M paths of feed sources for exciting the feed source array to form multi-beams;
the invention relates to a transmitting antenna simulator (shown in figure 5), which comprises M paths of variable phase shifting and attenuation components and an M-in-one power combiner; the variable attenuation component performs attenuation processing on the signals after phase shifting processing according to attenuation parameters provided by the control module, the variable phase shifting component performs phase shifting processing on M paths of feed source excitation signals output by the tested piece according to the phase shifting parameters provided by the control module, and the power combiner performs power combination on the M paths of signals after phase shifting processing to generate output signals of the transmitting antenna simulator, namely test signals.
Simulating the response of the corresponding feed source and reflector to the feed source excitation signal through M paths of variable phase-shifting and attenuation components; the control module is based on different orientations
The response of the lower feed source and the reflector to the feed source excitation signal controls the phase shift and the attenuation of a variable phase shift and attenuation component in the transmitting antenna simulator; the output of the transmitting antenna simulator is that K paths of beams are in azimuth
The signal of (a);
the mth path variable phase-shifting attenuation component in the transmitting antenna simulator is in azimuth
The phase shift and the attenuation quantity of the antenna are equal to that when the kth feed source is excited at the power of unit 1, the far field of the antenna is in the azimuth
Amplitude, phase of electric field value of (a):
wherein A ism,i、Φm,iThe amplitude and phase of the electric field respectively;
the control module stores the phase shift and attenuation parameters of all M paths of variable phase shift and attenuation components at all required test points as a phase shift and attenuation parameter table, and reads and controls the variable phase shift and attenuation components in the transmitting antenna simulator to work according to the azimuth angles of the test points during testing.
The frequency spectrograph is a universal instrument and is used for monitoring and reading the direction of K paths of wave beams
The signal level of (c).
Based on the ground test system, the invention also provides a test method, which is realized by the following steps:
step 1: the multi-carrier signal source outputs K (same frequency beam number) paths of equal-level signals S1 and S2 … … Sk with frequency interval of 100KHz, the equal-level signals are used for being equivalent to the same frequency carrier signals working at the same time and are connected to a beam input port corresponding to a load, a duplexer of the load is disconnected with a feed source, and the duplexer is connected with an input port of a transmitting antenna simulator (the transmitting antenna simulator replaces a feed source array and a reflector of a large-scale multi-beam antenna);
step 2: control module controls phase-shifting attenuation parameter A of transmitting antenna simulatorm,i、Φm,iAt a position
And step 3: the spectrometer is connected with the output port of the transmitting antenna simulator, and output power data S1, i, S2, i … … Sk, i corresponding to S1 and S2 … … Sk are respectively read and recorded on the spectrometer;
and 4, step 4: calculating the k-th beam at
Is/are as follows
And 5: and (4) repeating the steps 2 to 4 to finish the C/I test of all the M wave beams to be tested at all the points.
Example (b):
the multi-beam load of a certain mobile communication satellite is shown in fig. 2, the system has 109 beams, the duplexer realizes the transceiving sharing of 64 feed sources, the 109 beams realize 7-color multiplexing of 30MHz, and each frequency is multiplexed for 15 to 16 times.
The system provided by the invention is used for testing the C/I of all the beams according to the method of the invention and counting the minimum C/I in the service area of all the beams.
Through calculation, when the phase shift and attenuation components of the transmitting antenna simulator meet the requirements of amplitude and phase precision: when +/-0.5 dB and +/-10 degrees and the attenuation range of the attenuator is 0-35 dB, the main lobe error of the wave beam is less than 0.01dB, and the side lobe error is 1dB @30dBc (namely, the error of the side lobe which is 30dB lower than the level of the main lobe is about 1dB, and the error of the side lobe level of each wave beam is about 1 per thousand). The effect on C is known to be 0.01dB, with the maximum effect on I being about 6% o. The overall test error is about 0.03 dB.
The design results and the statistics of the actual measurement results are shown in fig. 6 and 7, and the actual measurement results and the design results are matched.
The invention is not described in detail and is within the knowledge of a person skilled in the art.
Claims (8)
1. A mobile communication satellite multi-beam carrier-to-interference ratio ground test system is characterized by comprising: the device comprises a power supply, a control module, a multi-channel signal source, a transmitting antenna simulator and a frequency spectrograph;
the power supply supplies power to the control module, the multi-channel signal source, the transmitting antenna simulator and the frequency spectrograph, the multi-channel signal source provides a constant-amplitude signal for the tested piece, and the tested piece outputs excitation signals of M paths of feed sources to the transmitting antenna simulator for forming multiple beams; the transmitting antenna simulator realizes the simulation of the response of the reflector and the feed source in the large-scale multi-beam antenna to the signals according to the received M paths of feed source exciting signals, and the control module realizes the simulation of the response of the reflector and the feed source in the large-scale multi-beam antenna to the signals according to different directions
The response of the lower feed source and the reflector to the feed source excitation signal controls the work of the transmitting antenna simulator, the frequency spectrograph is used for reading the level of the test signal output by the transmitting antenna simulator, and M is the number of the feed sources of the mobile communication satellite multi-beam load.
2. The mobile communication satellite multi-beam carrier-to-interference ratio ground test system of claim 1, wherein: the multichannel signal source outputs K paths of constant amplitude signals with frequency interval of 100KHz, and K is the number of beams with the same frequency in the mobile communication satellite multi-beam load.
3. The mobile communication satellite multi-beam carrier-to-interference ratio ground test system of claim 1, wherein: the tested piece is a transponder channel and a beam forming device in the mobile communication satellite multi-beam load.
4. The mobile communication satellite multi-beam carrier-to-interference ratio ground test system of claim 1, wherein: the transmitting antenna simulator comprises an M-path variable phase-shifting component, an attenuation component and a power combiner;
the variable phase-shifting component performs phase-shifting processing on M paths of feed source excitation signals output by the tested piece according to phase-shifting parameters provided by the control module, the attenuation component performs attenuation processing on signals after phase-shifting processing according to attenuation parameters provided by the control module, and the power combiner performs power combination on the M paths of signals after attenuation processing to generate output signals of the transmitting antenna simulator, namely test signals.
5. The mobile communication satellite multi-beam carrier-to-interference ratio ground test system of claim 4, wherein: the test signal refers to the azimuth of the K paths of wave beams output by the transmitting antenna simulator
Of the signal of (1).
6. The mobile communication satellite multi-beam carrier-to-interference ratio ground test system of claim 4, wherein: the mth path variable phase-shifting attenuation component in the transmitting antenna simulator is in azimuth
The phase shift and the attenuation quantity of the antenna are equal to that when the mth path feed source is excited in unit 1, the far field of the antenna is in the azimuth
Electric field value of
I.e.:
wherein A ism,i、Φm,iThe amplitude and phase of the electric field, respectively.
7. The mobile communication satellite multi-beam carrier-to-interference ratio ground test system of claim 6, wherein: amplitude and phase A of electric fieldm,i、Φm,iThe precision of the attenuation module meets +/-0.5 dB and +/-10 degrees, and the attenuation range of the attenuation module is 0-35 dB.
8. A test method implemented based on the mobile communication satellite multi-beam carrier-to-interference ratio ground test system of claim 1, characterized by the steps of:
step 1: the multi-carrier signal source outputs K paths of constant amplitude signals S1 and S2 … … SK with frequency interval of 100KHz, the same frequency carrier signals used for equivalent simultaneous working are connected to a wave beam input port corresponding to a tested piece, a duplexer of the tested piece is disconnected with a feed source, and the duplexer is connected with an input port of the transmitting antenna simulator;
step 2: the control module controls the phase shift parameter and attenuation parameter A of the transmitting antenna simulatorm,i、Φm,iAt a position
And step 3: the spectrometer is connected with an output port of the transmitting antenna simulator, and output power data S1, i, S2, i … … SK, i corresponding to S1 and S2 … … SK are respectively read and recorded on the spectrometer;
and 4, step 4: calculating the k-th beam at
Carrier to interference ratio of
And 5: and (4) repeating the steps 2 to 4 to finish the C/I test of all the K wave beams to be tested at all the points.
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| CN111541495A (en) * | 2020-04-21 | 2020-08-14 | 中国电子科技集团公司第五十四研究所 | Satellite radio measurement service forwarding load on-orbit testing system and method |
| CN114070433B (en) * | 2021-12-09 | 2023-05-09 | 中国电子科技集团公司第三十八研究所 | System and method for testing phase shift conversion time of multichannel transceiver component |
| CN114928416B (en) * | 2022-07-21 | 2022-12-27 | 成都金诺信高科技有限公司 | Automatic antenna inclination angle patrol optimization star search system and method |
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