CN111654335B - Wireless test method of relay data transmission system under whole satellite near field - Google Patents
Wireless test method of relay data transmission system under whole satellite near field Download PDFInfo
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- CN111654335B CN111654335B CN201911176980.XA CN201911176980A CN111654335B CN 111654335 B CN111654335 B CN 111654335B CN 201911176980 A CN201911176980 A CN 201911176980A CN 111654335 B CN111654335 B CN 111654335B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/102—Power radiated at antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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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
Abstract
The invention provides a wireless test method of a relay data transmission system under a whole satellite near field, which comprises the following steps: erecting a satellite and a ground test antenna in the plane near field; a reflector is arranged at the right center of the back of a secondary reflection feed source of the satellite relay data transmission antenna; horizontally installing a laser transmitter below the ground test antenna; during forward wireless test, the transmitting direction of the ground transmitting antenna is directed to the relay data transmission antenna; performing loss budget of a forward link according to an AGC value of a receiver on the satellite; and during the return wireless test, performing loss budget of the return link according to the ground received signal level. The wireless test data of the invention has high precision, reasonable method, feasible operation, easy realization of engineering and wide application prospect.
Description
Technical Field
The invention belongs to the technical field of spacecraft testing, and relates to a wireless testing method of a relay data transmission system under a whole satellite near field.
Background
In recent years, with the continuous development of aerospace technology in China, the relay data transmission system plays an increasingly important role in satellite load data transmission in aerospace application systems. Compared with the traditional ground data transmission system, the relay data transmission system is not limited by the domestic ground station, has the advantages of all-weather, strong real-time transmission and the like all the day long, and is increasingly applied to space engineering such as satellites.
However, the relay data transmission antenna of the relay data transmission system has a narrow beam width of only 1 degree or even narrower, and the distance to be tested can even reach several kilometers in order to meet the far field condition of measurement, so that the engineering requirement of testing in the whole satellite wireless state in a factory can not be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the inventor of the invention carries out intensive research, and the method is based on the light reflection principle, a reflector and a laser transmitter are respectively arranged at two ends of a relay data transmission antenna and a ground test antenna, and high-precision pointing backward forward link budget and radio frequency performance analysis of the ground transmission antenna, a receiving antenna and the relay data transmission antenna are realized by adjusting the height and the pitch angle of a ground test antenna holder, so that the engineering requirements of wireless test of a relay data transmission system under the whole-satellite near field can be met, and the invention is completed.
The invention aims to provide the following technical scheme:
the invention provides a wireless test method of a relay data transmission system under a whole satellite near field, which comprises the following steps:
step 1, respectively erecting a satellite and a ground test antenna in a plane near field at a set distance, wherein a secondary reflection feed source of the satellite relay data transmission antenna faces to the horizontal direction; the ground test antenna comprises a ground transmitting antenna and a ground receiving antenna which are horizontally arranged in a back-to-back mode, the erection height of the ground test antenna is the same as the height of a secondary reflection feed source of the relay data transmission antenna from the ground, and the ground test antenna is connected with the ground test signal processing unit;
step 2, a reflector is parallelly installed at the right center position of the back of a secondary reflection feed source of the satellite relay data transmission antenna, so that the central axis of a beam of the relay data transmission antenna is coincided with the normal direction of the reflector;
step 3, horizontally installing laser transmitters below the ground transmitting antenna and the ground receiving antenna respectively, wherein the fixing mode can ensure that the laser transmitting direction is always parallel to the beam central axis direction of the ground transmitting antenna and the ground receiving antenna;
step 4, during the forward wireless test, the transmitting direction of the ground transmitting antenna is oriented to the relay data transmission antenna; starting a laser transmitter below the ground transmitting antenna, adjusting the laser transmitter to a reflector on a secondary reflection feed source of the laser transmitting direct relay data transmission antenna, and enabling the laser transmitter to return to fall on a signal receiving part of the ground transmitting antenna;
step 5, the ground test signal processing unit outputs a forward transmitting signal according to the preset frequency and power, calculates a theoretical signal level value reaching an inlet of a relay data transmission receiver on the satellite through a ground test system insertion loss value, a ground transmitting antenna gain, a spatial attenuation value and a relay data transmission antenna gain, and simultaneously performs consistency comparison on two values and evaluates the performance of a forward radio frequency link of the relay data transmission system according to an actual signal level value corresponding to the back calculation of an automatic gain control quantity, namely an AGC value, of the relay data transmission receiver on the satellite;
step 6, during the return wireless test, the ground receiving antenna faces the satellite relay data transmission antenna, a laser transmitter below the satellite relay data transmission antenna is started, the laser transmitter is adjusted to a reflector on a secondary reflection feed source of the laser transmitting relay data transmission antenna, and the reflector can return to fall on a signal receiving part of the ground receiving antenna;
and 7, outputting a transmitting signal by the relay data transmission transmitter on the satellite, calculating a theoretical signal level value reaching a receiving inlet of the ground frequency spectrograph through the insertion loss value of the ground test system, the gain of the ground receiving antenna, the spatial attenuation value and the gain of the relay data transmission antenna, performing consistency comparison on the theoretical signal level value and an actual signal level value received by the ground frequency spectrograph, and evaluating the performance of the relay data transmission system returning to a radio frequency link.
The wireless test method of the relay data transmission system under the whole satellite near field provided by the invention brings beneficial technical effects:
(1) the invention can realize high-precision pointing of the relay data transmission antenna, the ground test transmitting antenna and the receiving antenna under the near-field wireless condition, thereby obtaining accurate inlet level of the forward satellite receiver and power value received by the return ground test equipment through link calculation;
(2) the ground test equipment is simple in design, only a pair of antenna supports, a two-dimensional rotary table, a pair of fixing tools, two laser transmitters, a pair of receiving and transmitting antennas and a conventional ground test signal processing unit are needed to form a set of ground antenna test equipment, engineering is easy to achieve, operation is simple, and application prospects are wide.
Drawings
Fig. 1 shows a block diagram of a wireless test principle of a relay data transmission system in a whole satellite near field.
Detailed Description
The invention is explained in more detail below with reference to the figures and examples. The features and advantages of the present invention will become more apparent from the description.
As shown in fig. 1, the present invention provides a wireless test method for a relay data transmission system under a whole satellite near field, where a relay data transmission antenna of the relay data transmission system is a cassegrain antenna, and the test method includes the following steps:
step 1, respectively erecting a satellite and a ground test antenna in a plane near field at a set distance, wherein a secondary reflection feed source of the satellite relay data transmission antenna faces to the horizontal direction; the ground test antenna comprises a ground transmitting antenna and a ground receiving antenna which are horizontally arranged in a back-to-back mode, the erection height of the ground test antenna is the same as the height of a secondary reflection feed source of the relay data transmission antenna from the ground, and the ground test antenna is connected with the ground test signal processing unit;
step 2, a reflector is parallelly installed at the right center position of the back of a secondary reflection feed source of the satellite relay data transmission antenna, so that the central axis of a beam of the relay data transmission antenna is coincided with the normal direction of the reflector;
step 3, horizontally installing laser transmitters below the ground transmitting antenna and the ground receiving antenna respectively, wherein the fixing mode can ensure that the laser transmitting direction is always parallel to the beam central axis direction of the ground transmitting antenna and the ground receiving antenna;
step 4, during the forward wireless test, the transmitting direction of the ground transmitting antenna is oriented to the relay data transmission antenna; starting a laser transmitter below the ground transmitting antenna, adjusting the laser transmitter to a reflector on a secondary reflection feed source of the laser transmitting direct relay data transmission antenna, and enabling the laser transmitter to return to fall on a signal receiving part of the ground transmitting antenna;
step 5, the ground test signal processing unit outputs a forward transmitting signal according to the preset frequency and power, calculates a theoretical signal level value reaching an inlet of a relay data transmission receiver on the satellite through a ground test system insertion loss value, a ground transmitting antenna gain, a spatial attenuation value and a relay data transmission antenna gain, and simultaneously back-calculates a corresponding actual signal level value according to an automatic gain control quantity (namely, an AGC value) of the relay data transmission receiver on the satellite, and compares the two values in consistency and evaluates the performance of a forward radio frequency link of the relay data transmission system;
step 6, during the return wireless test, the ground receiving antenna faces the satellite relay data transmission antenna, a laser transmitter below the satellite relay data transmission antenna is started, the laser transmitter is adjusted to a reflector on a secondary reflection feed source of the laser transmitting relay data transmission antenna, and the reflector can return to fall on a signal receiving part of the ground receiving antenna;
and 7, outputting a transmitting signal by the relay data transmission transmitter on the satellite, calculating a theoretical signal level value reaching a receiving inlet of the ground frequency spectrograph through the insertion loss value of the ground test system, the gain of the ground receiving antenna, the spatial attenuation value and the gain of the relay data transmission antenna, performing consistency comparison on the theoretical signal level value and an actual signal level value received by the ground frequency spectrograph, and evaluating the performance of the relay data transmission system returning to a radio frequency link.
The steps are specifically described below.
In the step 1 of the invention, a satellite and a ground test antenna are respectively erected in a plane near field at a set distance, and a secondary reflection feed source of the satellite relay data transmission antenna faces to the horizontal direction; the ground test antenna comprises a ground transmitting antenna and a ground receiving antenna which are horizontally arranged in a back-to-back mode, the erection height of the ground test antenna is the same as the height of a secondary reflection feed source of the relay data transmission antenna from the ground, and the ground test antenna is connected with the ground test signal processing unit.
In the invention, the plane near field means that the ground test equipment and the satellite are erected on the horizontal ground and are close to each other.
In the invention, a ground test system is adopted to test the wireless transmission performance of the relay data transmission system.
The ground test system comprises a ground test antenna, a ground test signal processing unit and ground test antenna mounting equipment, wherein:
the ground test antenna comprises a ground transmitting antenna and a ground receiving antenna, the ground transmitting antenna is used for transmitting signals to the relay data transmission antenna, and the ground receiving antenna is used for receiving the signals transmitted by the relay data transmission antenna;
the ground test signal processing unit is connected with the ground test antenna and used as a signal processing center to control the receiving and sending of signals and the signal processing; the device comprises a control computer, a signal source, a high-frequency cable, a frequency spectrograph and other devices; the system comprises a control computer, a signal source, a relay data transmission antenna, a high-frequency cable, a ground frequency spectrograph and a relay data transmission transmitter, wherein the control computer is used for all actions of a ground test system, the signal source is used for transmitting signals to the relay data transmission antenna when the performance of a forward radio frequency link is evaluated, the high-frequency cable is used for connecting electric devices of the ground test system, and the ground frequency spectrograph is used for receiving signals transmitted by the relay data transmission transmitter on a satellite, comparing the signals with theoretical signal level values reaching a receiving inlet of the ground frequency spectrograph and further evaluating the performance of the return radio frequency link of the relay data transmission system;
the laser transmitter is used for assisting the receiving and transmitting alignment of a feed source of the relay data transmission antenna and the ground test antenna, and a commercialized infrared collimator can be selected as the laser transmitter;
ground test antenna pedestal equipment, including (liftable) support, the fixed two-dimensional revolving stage on the support and the fixed frock that is used for fixed ground test antenna and laser emitter of installing on the two-dimensional revolving stage, wherein, the fixed frock up-and-down, the side-to-side motion of two-dimensional revolving stage be used for controlling its top, and then drive ground test antenna and laser emitter up-and-down, side-to-side motion.
In the present invention, the ground test antenna is a horn antenna. Thus, when the ground test antenna is erected, the antenna bell mouths of the ground transmitting antenna and the ground receiving antenna are outward. The reason for selecting the horn antenna is that the antenna has small volume and light weight while ensuring wide beam, large gain and circular polarization of the antenna.
Further, the selection criteria of the horn antenna as the ground transmitting antenna are as follows: working frequency band: 23-24 GHz, the tolerance power is more than or equal to 50W, the gain is more than or equal to 20dB, and the polarization mode is as follows: left-hand circular polarization, beam width: not less than 20 degrees, axial ratio: less than or equal to 2 dB.
The selection indexes of the horn antenna as the ground receiving antenna are as follows: working frequency band: 24-27 GHz, the endurance power is more than or equal to 50W, the gain is more than or equal to 20dB, and the polarization mode is as follows: right-hand circular polarization, beam width: not less than 20 degrees, axial ratio: less than or equal to 2 dB.
In the present invention, the satellite and the ground test antenna are at a set distance of 12m to 20m, preferably 15m to 18m, such as 16 m. The reason for selecting the range for setting the distance is that when the relay data transmission antenna directional diagram is in the distance, the antenna gain is flat and does not have violent jitter, so that the received signal level can be ensured not to have violent change when the ground test antenna rotates in a small range, and the accuracy of the received signal calculation of the forward return link is further ensured.
In step 2 of the invention, a reflector is parallelly arranged at the right center position of the back of a secondary reflection feed source of the satellite relay data transmission antenna, so that the central axis of a beam of the relay data transmission antenna is superposed with the normal direction of the reflector.
The secondary reflection feed source is of a circular structure with the diameter of about 5cm, so that the reflector is preferably a circular reflector with the diameter of not more than 5 cm; in order to fully utilize the secondary reflection feed source and facilitate the subsequent laser alignment operation, the reflector is preferably a circular reflector with the diameter of 5 cm.
In step 3 of the invention, laser transmitters are respectively and horizontally arranged below the ground transmitting antenna and the ground receiving antenna, and the fixing mode can ensure that the laser transmitting direction is always parallel to the central axis direction of the wave beam of the ground transmitting antenna and the ground receiving antenna.
In the invention, the transmitting and receiving alignment of the feed source of the relay data transmission antenna and the ground test antenna is carried out by the aid of the laser transmitters, so that the two laser transmitters, the ground transmitting antenna and the ground receiving antenna are respectively installed nearby (preferably, the laser transmitters are horizontally fixed within 2cm below the ground transmitting antenna and the ground receiving antenna), the positions of the two laser transmitters and the ground transmitting antenna and the ground receiving antenna are relatively fixed, and the rotation of the two-dimensional rotary table drives the laser transmitters and the ground test antenna to rotate together.
In step 4 of the invention, during forward wireless test, the transmitting direction of the ground transmitting antenna is directed to the relay data transmission antenna; and starting a laser transmitter below the ground transmitting antenna, adjusting the laser transmitter to a reflector on a secondary reflection feed source of the laser transmitting direct relay data transmission antenna, and returning the reflector to the signal receiving part of the ground transmitting antenna.
The adjustment of the laser transmitter is carried out in the following way:
the pitch angle and the azimuth angle of the fixed tool are controlled through the two-dimensional rotary table, and the laser emission direction is subjected to coarse scanning adjustment, so that laser falls into the reflecting surface of the relay data transmission antenna; and further performing fine scanning adjustment, namely controlling the two-dimensional turntable to scan in the azimuth direction according to 0.1-degree stepping to enable laser to irradiate into a reflector on a secondary reflection feed source of the relay digital transmission antenna, then controlling the two-dimensional turntable to scan in the pitch direction according to 0.1-degree stepping, and repeating the fine scanning adjustment step until the laser irradiates the upper reflector of the secondary feedback of the relay digital transmission antenna and can return to fall into a horn mouth of the ground transmitting antenna.
In step 5 of the present invention, after the step 4 is completed, the ground test signal processing unit processes the signal according to the preset frequency and power PFOutputting a forward transmission signal; and starting the relay data transmission receiver on the satellite and recording an AGC value. Insertion loss value L through ground test systemFGround transmitting antenna gain GFSpatial attenuation value LsAnd relay data transmission antenna gain GRAnd the formula P ═ PF+GF-LF-Ls+GRAnd calculating to obtain a theoretical signal level value reaching the entrance of the relay data transmission receiver on the satellite, wherein the insertion loss value L of the ground test systemFObtained by ground calibration (known) and spatial attenuation value LsBy the formula Ls20log R +20log F + 32.44. And finally, carrying out consistency comparison analysis on the calculated receiver inlet theoretical level value and a signal level value corresponding to the AGC value, thereby realizing the performance analysis of the forward link radio frequency link of the relay data transmission system.
For example, the ground test equipment insertion loss value LFCalibration of losses to 40dB through the groundThe preset frequency of the signal source of the test equipment is 23GHz and the power PFAt-30 dBm, ground-emitting antenna gain GFAt 20dBi, the relay data transmission antenna gain GR40dBi, spatial attenuation value LsBy the formula Ls83.76dB is obtained through calculation of 20log R +20log F +32.44, wherein R is the linear distance between the relay data transmission antenna and the ground antenna, and F is the frequency of a received signal 23 GHz; finally, the formula P is equal to PF+GF-LF-Ls+GRThe theoretical signal level value P-30 +20-40-83.76+ 40-93.76 dBm, approximately-94 dBm, is calculated to arrive at the satellite receiver inlet.
In the invention, the evaluation criteria of the forward link radio frequency link of the relay data transmission system are as follows:
and when the numerical difference value between the actual signal level value corresponding to the AGC value back calculation and the signal level value reaching the entrance of the relay data transmission receiver obtained by theoretical calculation is less than or equal to 5dB, the relay data transmission forward radio frequency link state is considered to be normal.
In step 6 of the invention, during the return wireless test, the two-dimensional turntable is rotated 180 degrees to enable the ground receiving antenna bell mouth to face the relay data transmission antenna. The ground receiving antenna faces the satellite relay data transmission antenna, the laser transmitter below the satellite relay data transmission antenna is started, the laser transmitter is adjusted to the reflecting mirror on the secondary reflecting feed source of the laser transmitting relay data transmission antenna, and the reflecting mirror can return to fall on the signal receiving part of the ground receiving antenna.
The adjustment of the laser transmitter is carried out in the following way:
the pitch angle and the azimuth angle of the antenna tool are controlled through the two-dimensional rotary table, and the laser emission direction is subjected to coarse scanning adjustment, so that laser falls into the reflecting surface of the relay data transmission antenna; and further performing fine scanning adjustment, namely controlling the two-dimensional turntable to scan in the azimuth direction according to 0.1-degree stepping to enable laser to irradiate into a reflector on the secondary reflection feed source of the relay digital transmission antenna, then controlling the two-dimensional turntable to scan in the pitch direction according to 0.1-degree stepping, and repeating the fine scanning adjustment step until the laser irradiates the reflector on the secondary reflection feed source of the relay digital transmission antenna and can return to fall into a horn mouth of the ground receiving antenna.
In step 7 of the invention, after the step 6 is completed, the relay data transmission transmitter on the satellite is started up, and the power P of the return transmission signal is outputR(ii) a Starting the ground frequency spectrograph, and recording the power value of the received return signal; insertion loss value L through ground test equipmentRGround receiving antenna gain GRSpatial attenuation value LsAnd relay data transmission antenna gain GFAnd the formula P ═ PR+GR-LR-Ls+GFCalculating to obtain theoretical signal level value reaching the inlet of the ground test equipment, wherein the insertion loss value L of the ground test equipmentRObtained by ground calibration, the spatial attenuation value LsBy the formula Ls20log R +20log F + 32.44. And finally, carrying out consistency comparison analysis on the calculated inlet theoretical level value of the ground test equipment and the signal power value received by the frequency spectrograph, thereby realizing the performance analysis of the radio frequency link of the return link of the relay data transmission system.
For example, the power P of the transmitted signal on the satelliteR47.4dBm, the insertion loss value L of the ground test systemRThrough the ground calibration loss of 40dB, the ground receiving antenna gain GRAt 20dBi, the relay data transmission antenna gain GF40dBi, spatial attenuation value LsBy the formula Ls84.48dB is obtained through calculation of 20log R +20log F +32.44, wherein R is the straight-line distance between the relay data transmission antenna and the ground antenna, and F is the frequency of a transmitted signal of 25 GHz; finally, by formula LsThe theoretical signal level value P to the surface test equipment is calculated to be 47.4+40-84.48-40+ 20-17.08 dBm, approximately-17 dBm, 20log R +20log F + 32.44.
In the invention, the evaluation standard of the radio frequency link of the return link of the relay data transmission system is as follows:
and when the numerical difference between the actual signal level value received by the ground frequency spectrograph and the signal level value which is obtained by theoretical calculation and reaches the receiving inlet of the ground frequency spectrograph is less than or equal to 5dB, the relay data transmission returning radio frequency link is considered to be normal.
The present invention has been described above in connection with preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the invention can be subjected to various substitutions and modifications, and the substitutions and the modifications are all within the protection scope of the invention.
Claims (10)
1. A wireless test method of a relay data transmission system under a whole satellite near field is characterized by comprising the following steps:
step 1, respectively erecting a satellite and a ground test antenna in a plane near field at a set distance, wherein a secondary reflection feed source of the satellite relay data transmission antenna faces to the horizontal direction; the ground test antenna comprises a ground transmitting antenna and a ground receiving antenna which are horizontally arranged in a back-to-back mode, the erection height of the ground test antenna is the same as the height of a secondary reflection feed source of the relay data transmission antenna from the ground, and the ground test antenna is connected with the ground test signal processing unit;
step 2, a reflector is parallelly installed at the right center position of the back of a secondary reflection feed source of the satellite relay data transmission antenna, so that the central axis of a beam of the relay data transmission antenna is coincided with the normal direction of the reflector;
step 3, horizontally installing laser transmitters below the ground transmitting antenna and the ground receiving antenna respectively, wherein the fixing mode can ensure that the laser transmitting direction is always parallel to the beam central axis direction of the ground transmitting antenna and the ground receiving antenna;
step 4, during the forward wireless test, the transmitting direction of the ground transmitting antenna is oriented to the relay data transmission antenna; starting a laser transmitter below the ground transmitting antenna, adjusting the laser transmitter to a reflector on a secondary reflection feed source of the laser transmitting direct relay data transmission antenna, and enabling the laser transmitter to return to fall on a signal receiving part of the ground transmitting antenna;
step 5, the ground test signal processing unit outputs a forward transmitting signal according to the preset frequency and power, calculates a theoretical signal level value reaching an inlet of a relay data transmission receiver on the satellite through a ground test system insertion loss value, a ground transmitting antenna gain, a spatial attenuation value and a relay data transmission antenna gain, and simultaneously performs consistency comparison on two values and evaluates the performance of a forward radio frequency link of the relay data transmission system according to an actual signal level value corresponding to the back calculation of an automatic gain control quantity, namely an AGC value, of the relay data transmission receiver on the satellite;
step 6, during the return wireless test, the ground receiving antenna faces the satellite relay data transmission antenna, a laser transmitter below the satellite relay data transmission antenna is started, the laser transmitter is adjusted to a reflector on a secondary reflection feed source of the laser transmitting relay data transmission antenna, and the reflector can return to fall on a signal receiving part of the ground receiving antenna;
and 7, outputting a transmitting signal by the relay data transmission transmitter on the satellite, calculating a theoretical signal level value reaching a receiving inlet of the ground frequency spectrograph through the insertion loss value of the ground test system, the gain of the ground receiving antenna, the spatial attenuation value and the gain of the relay data transmission antenna, performing consistency comparison on the theoretical signal level value and an actual signal level value received by the ground frequency spectrograph, and evaluating the performance of the relay data transmission system returning to a radio frequency link.
2. The wireless test method of claim 1, wherein the test method is used for testing wireless transmission performance through a ground test system, the ground test system comprises a ground test antenna, a ground test signal processing unit, and a ground test antenna mounting device, and the method comprises:
the ground test antenna comprises a ground transmitting antenna and a ground receiving antenna, the ground transmitting antenna is used for transmitting signals to the relay data transmission antenna, and the ground receiving antenna is used for receiving the signals transmitted by the relay data transmission antenna;
the ground test signal processing unit is connected with the ground test antenna, is used as a signal processing center, controls the receiving and sending of signals and processes the signals, and comprises a control computer, a signal source, a high-frequency cable and a frequency spectrograph, wherein the frequency spectrograph is used for receiving the signals sent by the relay data transmission transmitter on the satellite, comparing the signals with a theoretical signal level value reaching a receiving inlet of the ground frequency spectrograph, and further evaluating the performance of a return radio frequency link of the relay data transmission system;
the laser transmitter is used for assisting the receiving and transmitting alignment of a feed source of the relay data transmission antenna and the ground test antenna;
ground test antenna pedestal dress equipment, including the fixed two-dimensional revolving stage of fixed on support, support and the fixed frock that is used for fixed ground test antenna and laser emitter of installing on the two-dimensional revolving stage, wherein, the two-dimensional revolving stage is used for controlling the fixed frock of its top up-and-down, side-to-side movement, and then drives ground test antenna and laser emitter up-and-down, side-to-side movement.
3. The wireless test method of the relay data transmission system under the whole satellite near field according to claim 1, wherein in the step 1, the ground test antenna is a horn antenna.
4. The wireless test method of the relay data transmission system under the whole satellite near field according to claim 1, wherein in the step 1, the distance between the satellite and the ground test antenna is 12 m-20 m.
5. The wireless test method of the relay data transmission system under the whole satellite near field according to claim 1, wherein in the step 2, the reflector is a circular reflector with a diameter not greater than 5 cm.
6. The method for wirelessly testing the relay data transmission system in the whole satellite near field according to claim 1, wherein in step 3, the two laser transmitters are respectively installed nearby with the ground transmitting antenna and the ground receiving antenna, and the laser transmitters are horizontally fixed within 2cm below the ground transmitting antenna and the ground receiving antenna.
7. The method for wireless testing of the relay data transmission system under the whole satellite near field according to claim 2, wherein in the step 4, the adjustment of the laser transmitter is performed by:
the pitch angle and the azimuth angle of the fixed tool are controlled through the two-dimensional rotary table, and the laser emission direction is subjected to coarse scanning adjustment, so that laser falls into the reflecting surface of the relay data transmission antenna; further performing fine scanning adjustment, namely controlling the two-dimensional turntable to scan in the azimuth direction according to 0.1-degree stepping to enable laser to irradiate into a reflector on a secondary reflection feed source of the relay digital transmission antenna, then controlling the two-dimensional turntable to scan in the pitch direction according to 0.1-degree stepping, and repeating the fine scanning adjustment step until the laser irradiates the secondary feedback upper reflector of the relay digital transmission antenna and can return to the bell mouth of the ground transmitting antenna;
the laser transmitter is adjusted in step 6 in the same manner as in step 4.
8. The method as claimed in claim 1, wherein the theoretical signal level value of the relay data transmission system in step 5 is determined by the formula P-PF+GF-LF-Ls+GRTo obtain wherein PFPower when outputting forward transmission signal for ground test signal processing unit, LFFor ground test system insertion loss value, GFGain for ground transmitting antenna, LsIs a spatial attenuation value, GRTo relay the data transfer antenna gain.
9. The wireless test method of the relay data transmission system under the whole satellite near field according to claim 1, wherein in step 5, the evaluation criteria of the forward radio frequency link of the relay data transmission system are:
and when the numerical difference value between the actual signal level value corresponding to the AGC value back calculation and the signal level value reaching the entrance of the relay data transmission receiver obtained by theoretical calculation is less than or equal to 5dB, the relay data transmission forward radio frequency link state is considered to be normal.
10. The wireless test method of the relay data transmission system under the whole satellite near field according to claim 1, wherein in step 7, the evaluation standard of the return radio frequency link of the relay data transmission system is as follows:
and when the numerical difference between the actual signal level value received by the ground frequency spectrograph and the signal level value which is obtained by theoretical calculation and reaches the receiving inlet of the ground frequency spectrograph is less than or equal to 5dB, the relay data transmission returning radio frequency link is considered to be normal.
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