Test method and system for launch area radio frequency relay system of mars probe launch site

Abstract

The application provides a test method and system of a launch site launch area radio frequency relay system of a Mars probe, comprising: a calibration preparation step: preparing the state of a first uplink channel and a first downlink channel on the radio frequency relay system; an uplink insertion loss calibration step; a downlink insertion loss calibration step; a function test preparation step: preparing the state of a second uplink channel and a second downlink channel on the radio frequency relay system; an uplink function test step and a downlink function test step. Compared with the prior art, the application can fully verify the adaptability of the launch site radio frequency relay system to the uplink remote control signal and the downlink telemetry signal of the Mars probe, and ensure the smooth communication of the uplink remote control signal and the downlink telemetry signal between the Mars probe located on the launch tower and the test equipment of the remote test plant on the day of the real launch.

Description

[0001] This application is a divisional application of the following original application:

[0002] The original application was filed on January 14, 2022.

[0003] The original application number was 202210044394.5.

[0004] Original invention application title: Test method and system for radio frequency transponder system in launch area of ​​Mars probe launch site Technical Field

[0005] This invention relates to the field of spacecraft testing technology, and more specifically, to a testing method and system for a radio frequency relay system in the launch area of ​​a Mars probe launch site. Background Technology

[0006] The radio frequency (RF) relay system in the launch area of ​​the Mars probe launch site is an important component of the launch site's ground support system. It is responsible for relaying downlink telemetry signals from the Mars probe on the launch tower to the Mars probe test equipment in the remote test facility, and relaying uplink remote control signals from the Mars probe test equipment in the remote test facility to the Mars probe on the launch tower. On launch day, if the RF relay system in the launch area malfunctions or fails to relay uplink or downlink remote control signals, it will affect the Mars probe's status settings and telemetry monitoring, and may even lead to launch mission interruption. Therefore, it is necessary to fully assess the functionality and correctness of the RF relay system in the launch area before the Mars probe launch, test its adaptability to the Mars probe's uplink and downlink remote control signals, and plan the relay scheme for launch day in advance, including the placement of the relay antennas and the attenuation settings of the relay system.

[0007] However, the launch status and uplink / downlink signal characteristics of spacecraft launched from the Mars probe launch site are quite different from those of the Mars probe. The relay system scheme and the test methods for the radio frequency relay system in the launch area are not applicable to the Mars probe. Furthermore, since this is the first launch of the Mars probe, the radio frequency relay system in the launch area of ​​the launch site needs to be tested based on the launch status and uplink / downlink signal characteristics of the Mars probe, and a relay scheme needs to be designed.

[0008] Patent document CN111516908A discloses a fault diagnosis method for the propulsion system of a Mars probe. The Mars probe includes two accelerometers and three sets of gyroscopes. The propulsion system of the Mars probe includes an orbit control thruster and an attitude control thruster. The method determines that the orbit control thruster is normal based on the measurement values ​​of the two accelerometers and that the attitude control thruster is normal based on the measurement values ​​of the three gyroscopes. However, this method only diagnoses faults in the propulsion system of the Mars probe and does not involve functional testing of the Mars probe's radio frequency transponder system. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the purpose of this invention is to provide a testing method and system for the radio frequency relay system of the launch area of ​​a Mars probe launch site.

[0010] A test method for a radio frequency repeater system in the launch area of ​​a Mars probe launch site, provided by the present invention, includes:

[0011] Calibration preparation steps: Perform status preparation for the first uplink and first downlink channels on the radio frequency forwarding system;

[0012] Uplink insertion loss calibration steps: Perform insertion loss calibration on the first uplink channel;

[0013] Downlink insertion loss calibration steps: Perform insertion loss calibration on the first downlink channel;

[0014] Functional test preparation steps: Prepare the status of the second uplink and second downlink channels on the RF transceiver system;

[0015] Uplink function test steps: Perform remote control signal forwarding function test on the second uplink channel;

[0016] Downlink function test procedure: Perform telemetry signal forwarding function test on the second downlink channel.

[0017] Preferably, the calibration preparation steps include:

[0018] The first connection sub-step of the test equipment in the back-end RF repeater room: connect the first signal generator to the uplink channel entrance of the back-end RF repeater cabinet, and connect the first spectrum analyzer to the downlink channel exit of the back-end RF repeater cabinet;

[0019] The first connection sub-step of the test equipment in the front-end RF repeater room: connect the uplink channel outlet of the front-end RF repeater cabinet to the uplink repeater transmitting antenna on the fixed tower platform via an RF cable, and connect the downlink channel inlet of the front-end RF repeater cabinet to the downlink repeater receiving antenna on the fixed tower platform via an RF cable.

[0020] The first connection step of the on-device product: Place the circulator transmitting antenna and the circulator receiving antenna on the rotating platform in the fairing area, connect the circulator transmitting antenna to the second signal generator in the front-end RF transceiver room via an RF cable, and connect the circulator receiving antenna to the second spectrum analyzer in the front-end RF transceiver room via an RF cable.

[0021] Preferably, the uplink insertion loss calibration step includes:

[0022] Step S201: The first uplink channel is set to the first primary state by the control software of the radio frequency forwarding system. The first primary state is characterized by forwarding radio frequency signals through the back-end uplink primary equipment, optical fiber cable and front-end uplink primary equipment, and the first attenuation value of the adjustable attenuator in the back-end uplink primary equipment and the front-end uplink primary equipment is set to 0.

[0023] Step S202: The first signal generator in the back-end radio frequency relay room outputs a first single-carrier signal. The frequency of the first single-carrier signal is equal to the carrier frequency of the received signal of the Mars probe's transponder. The first power value of the first single-carrier signal is equal to the midpoint of the input power range of the back-end uplink primary device.

[0024] Step S203: Measure the uplink signal power transmitted by the first uplink channel forwarding and uplink forwarding transmitting antenna and received by the surround receiving antenna on the second spectrum analyzer in the front-end radio frequency forwarding room, record the uplink signal power value, and obtain the first insertion loss reference value of the first uplink channel based on the first power value and the uplink signal power value.

[0025] Step S204: Adjust the first attenuation value of the adjustable attenuator of the back-end uplink primary device and the front-end uplink primary device according to the first insertion loss reference value, and measure the uplink signal power on the second spectrum analyzer so that the uplink signal power received on the second spectrum analyzer is equal to the median value of the dynamic range of the received signal of the transponder, and record the first attenuation value.

[0026] Step S205: Set the first uplink channel to the first backup state through the control software of the radio frequency forwarding system. The first backup state is characterized by forwarding radio frequency signals through the back-end uplink backup device, optical fiber cable and front-end uplink backup device, and setting the second attenuation value of the adjustable attenuator in the back-end uplink backup device and the front-end uplink backup device to 0.

[0027] Step S206: Repeat steps S202-S204, wherein, during repeated execution, the back-end uplink primary device in steps S202-S204 is replaced with the back-end uplink backup device, and the front-end uplink primary device is replaced with the front-end uplink backup device, thereby completing the insertion loss calibration of the first uplink channel of the radio frequency forwarding system.

[0028] Preferably, the downlink insertion loss calibration step includes:

[0029] Step S301: Set the first downlink channel to the second primary state through the radio frequency forwarding system control software. The second primary state indicates that radio frequency signals are forwarded through the front-end downlink primary equipment, optical fiber cable and back-end downlink primary equipment, and the third attenuation value of the adjustable attenuator in the front-end downlink primary equipment and the back-end downlink primary equipment is set to 0.

[0030] Step S302: The second signal generator outputs a second single-carrier signal. The frequency of the second single-carrier signal is equal to the carrier frequency of the transponder's transmitted signal, and the second power value of the second single-carrier signal is equal to the output signal power value of the power amplifier of the Mars probe's telemetry and control downlink channel.

[0031] Step S303: Measure the downlink signal power transmitted by the surround transmitting antenna and received by the downlink relay receiving antenna and forwarded by the first downlink channel on the first spectrum analyzer, record the downlink signal power value, and obtain the second insertion loss reference value of the first downlink channel based on the second power value and the downlink signal power value;

[0032] Step S304: Adjust the third attenuation value of the adjustable attenuator of the front-end downlink main device and the back-end downlink main device according to the second insertion loss reference value, and measure the downlink signal power on the first spectrum analyzer in the back-end RF relay room so that the downlink signal power received on the first spectrum analyzer is equal to the median value of the dynamic range of the received signal of the Mars probe RF test equipment, and record the third attenuation value.

[0033] Step S305: Set the first downlink channel to the second backup state through the control software of the radio frequency forwarding system. The second backup state is characterized by forwarding radio frequency signals through the front-end downlink backup device, optical fiber cable and back-end downlink backup device, and setting the fourth attenuation value of the adjustable attenuator in the front-end downlink backup device and the back-end downlink backup device to 0.

[0034] Step S306: Repeat steps S302-S304, wherein, during the repeated execution, the front-end downlink primary device in steps S302-S304 is replaced with the front-end downlink backup device, and the back-end downlink primary device is replaced with the back-end downlink backup device, thereby completing the insertion loss calibration of the first downlink channel of the radio frequency forwarding system.

[0035] Preferably, the functional test preparation steps include:

[0036] The second connection sub-step of the test equipment in the back-end RF repeater: connect the uplink remote control transmitting port of the Mars probe RF test equipment to the uplink channel entrance of the back-end RF repeater cabinet, and connect the downlink telemetry receiving port of the Mars probe RF test equipment to the downlink channel exit of the back-end RF repeater cabinet.

[0037] The second connection sub-step of the test equipment in the front-end RF repeater room: connect the uplink channel outlet of the front-end RF repeater cabinet to the uplink repeater transmitting antenna on the fixed tower platform via an RF cable, and connect the downlink channel inlet of the front-end RF repeater cabinet to the downlink repeater receiving antenna on the fixed tower platform via an RF cable.

[0038] The second connection step for the onboard products: Place the orbiter transmitting antenna and the orbiter receiving antenna on the rotating platform in the fairing area. Connect the orbiter transmitting antenna to the downlink telemetry signal transmitting port of the power amplifier electrical component of the Mars rover in the front-end radio frequency transponder room via an RF cable. Connect the orbiter receiving antenna to the uplink remote control signal receiving port of the transponder electrical component in the front-end radio frequency transponder room via an RF cable. Connect the transponder electrical component, the power amplifier electrical component, and the ground detection equipment.

[0039] Preferably, the uplink function testing steps include:

[0040] Step S501: Set the second uplink channel to the third primary state. The third primary state indicates that radio frequency signals are forwarded through the back-end uplink primary equipment, optical fiber cable and front-end uplink primary equipment, and the fifth attenuation value of the adjustable attenuator in the back-end uplink primary equipment and the front-end uplink primary equipment is set to the first attenuation value.

[0041] Step S502: Power on the transponder electromechanical components using ground testing equipment;

[0042] Step S503: The Mars probe radio frequency test equipment in the back-end radio frequency relay room outputs an uplink remote control signal. The third power value of the uplink remote control signal is equal to the midpoint of the input power range of the back-end uplink main device.

[0043] Step S504: Monitor the working status of the transponder through the ground inspection equipment to confirm that the transponder is transmitting to the second uplink channel and the uplink transmission antenna, and that the reception and locking of the uplink remote control signal received by the surround receiving antenna are normal.

[0044] Step S505: The Mars probe radio frequency test equipment continuously sends a first remote control command frame with fixed data content multiple times, and receives and demodulates a second remote control command frame from the uplink remote control signal through the ground test equipment. The data content of the remote control command corresponding to the second remote control command frame is subjected to bit error detection to confirm that the data content of the received remote control command is error-free.

[0045] Step S506: Set the second uplink channel to the third backup state through the control software of the radio frequency forwarding system. The third backup state is characterized by forwarding radio frequency signals through the back-end uplink backup device, fiber optic cable and front-end uplink backup device, and setting the sixth attenuation value of the adjustable attenuator in the back-end uplink backup device and the front-end uplink backup device to the second attenuation value.

[0046] Step S507: Repeat steps S502-S505, wherein, during the repeated execution, the front-end uplink primary and secondary devices in steps S502-S505 are replaced with front-end uplink backup devices, and the back-end uplink primary and secondary devices are replaced with back-end uplink backup devices, thereby completing the forwarding function test of the second uplink channel of the radio frequency forwarding system.

[0047] Preferably, the downlink function test steps include:

[0048] Step S601: The second downlink channel is set to the fourth primary state through the control software of the radio frequency forwarding system. The fourth primary state is characterized by radio frequency signal forwarding through the front-end downlink primary equipment, optical fiber cable and back-end downlink primary equipment, and the seventh attenuation value of the adjustable attenuator in the front-end downlink primary equipment and the back-end downlink primary equipment is set to the third attenuation value.

[0049] Step S602: Power on the transponder electrical components and power amplifier electrical components through the ground testing equipment, and set the downlink transmit port of the transponder electrical components, and output downlink telemetry signals through the power amplifier electrical components;

[0050] Step S603: Monitor the reception status of downlink telemetry signals on the Mars probe's radio frequency test equipment to confirm that the Mars probe's radio frequency test equipment is receiving and locking down the downlink telemetry signals normally.

[0051] Step S604: The ground inspection equipment continuously outputs a first telemetry frame with fixed data content, which is then modulated and output through the response electromechanical components;

[0052] Step S605: The Mars probe radio frequency test equipment receives the telemetry signal corresponding to the first telemetry frame and demodulates the telemetry data. It performs error detection on the telemetry data and confirms that the received telemetry data is error-free.

[0053] Step S606: Set the second downlink channel to the fourth backup state through the control software of the radio frequency forwarding system. The fourth backup state is characterized by radio frequency signal forwarding through the front-end downlink backup device, optical fiber cable and back-end downlink backup device, and set the eighth attenuation value of the adjustable attenuator in the front-end downlink backup device and the back-end downlink backup device to the fourth attenuation value.

[0054] Step S607: Repeat steps S602-S605, wherein, during the repeated execution, the front-end uplink primary and secondary devices in steps S602-S605 are replaced with front-end uplink backup devices, and the back-end uplink primary and secondary devices are replaced with back-end uplink backup devices, thereby completing the forwarding function test of the second downlink channel telemetry signal of the radio frequency forwarding system.

[0055] Preferably, step S505 includes:

[0056] A third remote control command frame, whose data content is consistent with that of the first remote control command frame sent by the radio frequency test equipment of the Mars probe, is pre-set as the comparison benchmark. Each second remote control command frame is compared bit by bit with the third remote control command frame.

[0057] Preferably, step S605 includes: pre-setting a second telemetry frame whose data content is consistent with the first telemetry frame sent by the ground inspection equipment as a comparison benchmark, and performing a bit-by-bit consistency comparison between each third telemetry frame demodulated from the telemetry signal forwarded from the radio frequency relay system and the second telemetry frame used as the comparison benchmark.

[0058] A test system for a radio frequency repeater system in the launch area of ​​a Mars probe launch site, provided by the present invention, includes:

[0059] Calibration preparation module: Performs state preparation for the first uplink and first downlink channels on the radio frequency forwarding system;

[0060] Uplink insertion loss calibration module: Performs insertion loss calibration on the first uplink channel;

[0061] Downlink insertion loss calibration module: Performs insertion loss calibration on the first downlink channel;

[0062] Functional test preparation module: Prepare the status of the second uplink and second downlink channels on the RF transceiver system;

[0063] Uplink Function Test Module: Perform remote control signal forwarding function test on the second uplink channel;

[0064] Downlink Function Test Module: Perform telemetry signal forwarding function test on the second downlink channel.

[0065] Preferably, the calibration preparation module includes:

[0066] The first connection submodule of the test equipment in the back-end RF repeater room: connects the first signal generator to the uplink channel entrance of the back-end RF repeater cabinet and connects the first spectrum analyzer to the downlink channel exit of the back-end RF repeater cabinet;

[0067] The first connection submodule of the test equipment in the front-end RF repeater cabinet: connects the uplink channel outlet of the front-end RF repeater cabinet to the uplink repeater transmitting antenna on the fixed tower platform via an RF cable, and connects the downlink channel inlet of the front-end RF repeater cabinet to the downlink repeater receiving antenna on the fixed tower platform via an RF cable;

[0068] The first connection submodule of the on-board product: The circulator transmitting antenna and the circulator receiving antenna are placed on the rotating platform in the fairing area. The circulator transmitting antenna is connected to the second signal generator in the front-end RF transceiver room via an RF cable. The circulator receiving antenna is connected to the second spectrum analyzer in the front-end RF transceiver room via an RF cable.

[0069] Preferably, the uplink insertion loss calibration module includes:

[0070] Submodule M201: The control software of the radio frequency forwarding system sets the first uplink channel to the first primary state. The first primary state is characterized by forwarding radio frequency signals through the back-end uplink primary equipment, optical fiber cable and front-end uplink primary equipment, and setting the first attenuation value of the adjustable attenuator in the back-end uplink primary equipment and the front-end uplink primary equipment to 0.

[0071] Submodule M202: The first signal generator in the back-end radio frequency relay room outputs the first single-carrier signal. The frequency of the first single-carrier signal is equal to the carrier frequency of the received signal of the Mars probe's transponder. The first power value of the first single-carrier signal is equal to the midpoint of the input power range of the back-end uplink main device.

[0072] Submodule M203: Measure the uplink signal power transmitted by the first uplink channel forwarding and uplink forwarding transmitting antenna and received by the surround receiving antenna on the second spectrum analyzer in the front-end RF forwarding room, record the uplink signal power value, and obtain the first insertion loss reference value of the first uplink channel based on the first power value and the uplink signal power value;

[0073] Submodule M204: Adjusts the first attenuation value of the adjustable attenuator of the back-end uplink primary device and the front-end uplink primary device according to the first insertion loss reference value, and measures the uplink signal power on the second spectrum analyzer so that the uplink signal power received on the second spectrum analyzer is equal to the median value of the dynamic range of the transponder's received signal, and records the first attenuation value.

[0074] Submodule M205: The first uplink channel is set to the first backup state through the control software of the radio frequency forwarding system. The first backup state is characterized by forwarding radio frequency signals through the back-end uplink backup device, fiber optic cable and front-end uplink backup device, and setting the second attenuation value of the adjustable attenuator in the back-end uplink backup device and the front-end uplink backup device to 0.

[0075] Submodule M206: Repeat steps S202-S204. During repeated execution, the back-end uplink primary device in steps S202-S204 is replaced with the back-end uplink backup device, and the front-end uplink primary device is replaced with the front-end uplink backup device, thus completing the insertion loss calibration of the first uplink channel of the RF forwarding system.

[0076] Preferably, the downlink insertion loss calibration module includes:

[0077] Submodule M301: The first downlink channel is set to the second primary state through the radio frequency forwarding system control software. The second primary state indicates that radio frequency signals are forwarded through the front-end downlink primary equipment, optical fiber cable and back-end downlink primary equipment, and the third attenuation value of the adjustable attenuator in the front-end downlink primary equipment and the back-end downlink primary equipment is set to 0.

[0078] Submodule M302: The second signal generator outputs a second single-carrier signal. The frequency of the second single-carrier signal is equal to the carrier frequency of the transponder's transmitted signal, and the second power value of the second single-carrier signal is equal to the output signal power value of the power amplifier of the Mars probe's telemetry and control downlink channel.

[0079] Submodule M303: Measure the downlink signal power transmitted by the surround transmitting antenna and received by the downlink relay receiving antenna and forwarded by the first downlink channel on the first spectrum analyzer, record the downlink signal power value, and obtain the second insertion loss reference value of the first downlink channel based on the second power value and the downlink signal power value;

[0080] Submodule M304: Adjusts the third attenuation value of the adjustable attenuator of the front-end downlink main device and the back-end downlink main device according to the second insertion loss reference value, and measures the downlink signal power on the first spectrum analyzer in the back-end RF relay room, so that the downlink signal power received on the first spectrum analyzer is equal to the median value of the dynamic range of the received signal of the Mars probe RF test equipment, and records the third attenuation value.

[0081] Submodule M305: The control software of the radio frequency forwarding system sets the first downlink channel to the second backup state. The second backup state is characterized by radio frequency signal forwarding through the front-end downlink backup device, fiber optic cable and back-end downlink backup device, and sets the fourth attenuation value of the adjustable attenuator in the front-end downlink backup device and the back-end downlink backup device to 0.

[0082] Submodule M306: Repeat steps S302-S304. During repeated execution, the front-end downlink primary device in steps S302-S304 is replaced with the front-end downlink backup device, and the back-end downlink primary device is replaced with the back-end downlink backup device, thus completing the insertion loss calibration of the first downlink channel of the radio frequency forwarding system.

[0083] Preferably, the functional test preparation module includes:

[0084] The second connection submodule of the test equipment in the back-end RF repeater: connects the uplink remote control transmitting port of the Mars probe RF test equipment to the uplink channel entrance of the back-end RF repeater cabinet, and connects the downlink telemetry receiving port of the Mars probe RF test equipment to the downlink channel exit of the back-end RF repeater cabinet;

[0085] The second connection submodule of the test equipment in the front-end RF repeater room: connects the uplink channel outlet of the front-end RF repeater cabinet to the uplink repeater transmitting antenna on the fixed tower platform via an RF cable, and connects the downlink channel inlet of the front-end RF repeater cabinet to the downlink repeater receiving antenna on the fixed tower platform via an RF cable;

[0086] The second connection submodule of the onboard product: The orbiter transmitting antenna and the orbiter receiving antenna are placed on the rotating platform in the fairing area. The orbiter transmitting antenna is connected to the downlink telemetry signal transmitting port of the power amplifier electrical component of the Mars rover in the front-end radio frequency transponder room via an RF cable. The orbiter receiving antenna is connected to the uplink remote control signal receiving port of the transponder electrical component in the front-end radio frequency transponder room via an RF cable. The transponder electrical component, the power amplifier electrical component, and the ground detection equipment are connected.

[0087] Preferably, the uplink function testing module includes:

[0088] Submodule M501: Sets the second uplink channel to the third primary state. The third primary state indicates that the radio frequency signal is forwarded through the back-end uplink primary device, fiber optic cable and front-end uplink primary device, and sets the fifth attenuation value of the adjustable attenuator in the back-end uplink primary device and the front-end uplink primary device to the first attenuation value.

[0089] Submodule M502: Powers the transponder electromechanical components via ground testing equipment;

[0090] Submodule M503: The Mars probe RF test equipment in the back-end RF relay room outputs an uplink remote control signal. The third power value of the uplink remote control signal is equal to the midpoint of the input power range of the back-end uplink main device.

[0091] Submodule M504: Monitors the working status of the transponder through ground testing equipment to confirm that the transponder is transmitting to the second uplink channel and the uplink transmission antenna, and that the reception and locking of the uplink remote control signal received by the surround receiving antenna are normal.

[0092] Submodule M505: The Mars probe radio frequency test equipment continuously sends a first remote control command frame with fixed data content multiple times, and receives and demodulates a second remote control command frame from the uplink remote control signal through the ground test equipment. It performs bit error detection on the data content of the remote control command corresponding to the second remote control command frame to confirm that the data content of the received remote control command is error-free.

[0093] Submodule M506: The control software of the radio frequency forwarding system sets the second uplink channel to the third backup state. The third backup state is characterized by forwarding radio frequency signals through the back-end uplink backup equipment, fiber optic cable and front-end uplink backup equipment, and setting the sixth attenuation value of the adjustable attenuator in the back-end uplink backup equipment and the front-end uplink backup equipment to the second attenuation value.

[0094] Submodule M507: Repeat steps S502-S505. During repeated execution, the front-end uplink primary and secondary devices in steps S502-S505 are replaced with front-end uplink backup devices, and the back-end uplink primary and secondary devices are replaced with back-end uplink backup devices to complete the forwarding function test of the second uplink channel of the radio frequency forwarding system.

[0095] Preferably, the downlink function test module includes:

[0096] Submodule M601: The control software of the radio frequency forwarding system sets the second downlink channel to the fourth primary state. The fourth primary state is characterized by radio frequency signal forwarding through the front-end downlink primary equipment, fiber optic cable and back-end downlink primary equipment, and sets the seventh attenuation value of the adjustable attenuator in the front-end downlink primary equipment and the back-end downlink primary equipment to the third attenuation value.

[0097] Submodule M602: Powers the transponder electrical components and power amplifier electrical components through the ground inspection equipment, and sets the downlink transmit port of the transponder electrical components, outputting downlink telemetry signals through the power amplifier electrical components;

[0098] Submodule MS603: Monitors the reception status of downlink telemetry signals on the Mars probe's RF test equipment to confirm that the Mars probe's RF test equipment is receiving and locking downlink telemetry signals normally;

[0099] Submodule M604: The first telemetry frame with fixed data content is continuously output through the ground inspection equipment and modulated by the response electromechanical components;

[0100] Submodule M605: The Mars probe radio frequency test equipment receives the telemetry signal corresponding to the first telemetry frame and demodulates the telemetry data. It performs error detection on the telemetry data and confirms that the received telemetry data is error-free.

[0101] Submodule M606: The control software of the radio frequency forwarding system sets the second downlink channel to the fourth backup state. The fourth backup state is characterized by radio frequency signal forwarding through the front-end downlink backup device, fiber optic cable and back-end downlink backup device, and sets the eighth attenuation value of the adjustable attenuator in the front-end downlink backup device and the back-end downlink backup device to the fourth attenuation value.

[0102] Submodule M607: Repeat steps S602-S605. During repeated execution, the front-end uplink primary and secondary devices in steps S602-S605 are replaced with front-end uplink backup devices, and the back-end uplink primary and secondary devices are replaced with back-end uplink backup devices to complete the forwarding function test of the second downlink channel telemetry signal of the radio frequency forwarding system.

[0103] Preferably, submodule M505 includes:

[0104] A third remote control command frame, whose data content is consistent with that of the first remote control command frame sent by the radio frequency test equipment of the Mars probe, is pre-set as the comparison benchmark. Each second remote control command frame is compared bit by bit with the third remote control command frame.

[0105] Preferably, submodule M605 includes:

[0106] A second telemetry frame, whose data content is consistent with the first telemetry frame sent by the ground inspection equipment, is pre-set as a comparison benchmark. Each third telemetry frame demodulated from the telemetry signal forwarded by the radio frequency relay system is compared bit by bit with the second telemetry frame used as the comparison benchmark.

[0107] Compared with the prior art, the present invention has the following beneficial effects:

[0108] 1. This invention can test the insertion loss calibration and RF signal forwarding functions of the uplink main backup channel and downlink main backup channel of the RF forwarding system in the launch area of ​​the Mars probe before launch, and fully verify the adaptability of the launch site RF forwarding system to the forwarding of remote control signals and telemetry signals of the Mars probe.

[0109] 2. The functional test of this invention can simulate the antenna position, uplink and downlink signal status, and relay antenna layout of the Mars probe on the actual launch day. The test results can provide guidance for the relay scheme on the actual launch day, including the attenuation settings of the downlink channel of the uplink channel of the radio frequency relay system on the actual launch day, the placement of the uplink relay transmitting antenna and the downlink relay receiving antenna, etc., to ensure smooth communication of remote control signals and telemetry signals between the Mars probe located on the launch tower and the test equipment in the remote test facility on the actual launch day. Attached Figure Description

[0110] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0111] Figure 1 This is a schematic diagram of the process of the present invention;

[0112] Figure 2 This is a schematic diagram of the insertion loss calibration structure of the present invention;

[0113] Figure 3 This is a schematic diagram of the testable structure of the present invention. Detailed Implementation

[0114] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0115] Figure 1 This is a schematic diagram of the process of the present invention, such as Figure 1 As shown, this invention provides a test method for a radio frequency transponder system in the launch area of ​​a Mars probe launch site, comprising:

[0116] Calibration preparation steps: Perform status preparation for the first uplink and the first downlink channels on the radio frequency forwarding system.

[0117] Preferably, the calibration preparation steps include: a first connection sub-step for the test equipment in the back-end RF repeater room: connecting a first signal generator to the uplink channel entrance of the back-end RF repeater cabinet and connecting a first spectrum analyzer to the downlink channel exit of the back-end RF repeater cabinet; a first connection sub-step for the test equipment in the front-end RF repeater room: connecting the uplink channel exit of the front-end RF repeater cabinet to the uplink repeater transmitting antenna on the fixed tower platform via an RF cable, and connecting the downlink channel entrance of the front-end RF repeater cabinet to the downlink repeater receiving antenna on the fixed tower platform via an RF cable; and a first connection sub-step for the on-device products: placing the surround transmitting antenna and the surround receiving antenna on the rotating platform in the rectifier area, connecting the surround transmitting antenna to the second signal generator in the front-end RF repeater room via an RF cable, and connecting the surround receiving antenna to the second spectrum analyzer in the front-end RF repeater room via an RF cable.

[0118] In this invention, there is no limitation on the type of the first signal generator. For example, it can be the Keysight E8267D signal generator.

[0119] In this invention, there is no limitation on the type of the first spectrum analyzer. For example, it can be the Keysight 9030A spectrum analyzer.

[0120] Specifically, Figure 2 This is a schematic diagram of the insertion loss calibration structure of the present invention, as shown below. Figure 2As shown, the method includes connecting a first signal generator to the uplink channel entrance of the back-end RF repeater cabinet and a first spectrum analyzer to the downlink channel exit of the back-end RF repeater cabinet; connecting the uplink channel exit of the front-end RF repeater cabinet to the uplink transmitting antenna on the fixed tower platform via an RF cable and connecting the downlink channel entrance of the front-end RF repeater cabinet to the downlink receiving antenna on the fixed tower platform via an RF cable; placing the circulator transmitting antenna and the circulator receiving antenna on the rotating platform in the fairing area, connecting the circulator transmitting antenna to the second signal generator in the front-end RF repeater room via an RF cable, and connecting the circulator receiving antenna to the second spectrum analyzer in the front-end RF repeater room via an RF cable.

[0121] Uplink insertion loss calibration steps: Perform insertion loss calibration on the first uplink channel.

[0122] Preferably, the uplink insertion loss calibration step includes: Step S201: Setting the first uplink channel to a first primary state via the control software of the RF relay system. The first primary state is characterized by the forwarding of RF signals through the back-end uplink primary equipment, fiber optic cable, and front-end uplink primary equipment, and setting the first attenuation value of the adjustable attenuator in the back-end uplink primary equipment and the front-end uplink primary equipment to 0; Step S202: The first signal generator in the back-end RF relay room outputs a first single-carrier signal. The frequency of the first single-carrier signal is equal to the carrier frequency of the received signal of the Mars probe's transponder, and the first power value of the first single-carrier signal is equal to the midpoint of the input power range of the back-end uplink primary equipment; Step S203: Measuring the uplink signal power transmitted by the uplink relay transmitting antenna and received by the surround receiving antenna via the second spectrum analyzer in the front-end RF relay room, recording the uplink signal power value, and obtaining the first insertion loss baseline of the first uplink channel based on the first power value and the uplink signal power value. Step S204: Adjust the first attenuation value of the adjustable attenuator of the back-end uplink primary device and the front-end uplink primary device according to the first insertion loss reference value, and measure the uplink signal power on the second spectrum analyzer so that the uplink signal power received on the second spectrum analyzer is equal to the median value of the dynamic range of the received signal of the transponder, and record the first attenuation value; Step S205: Set the first uplink channel to the first backup state through the control software of the radio frequency forwarding system. The first backup state is characterized by radio frequency signal forwarding through the back-end uplink backup device, optical fiber cable and front-end uplink backup device, and set the second attenuation value of the adjustable attenuator in the back-end uplink backup device and the front-end uplink backup device to 0; Step S206: Repeat steps S202-S204, wherein, when repeating, the back-end uplink primary device in steps S202-S204 is replaced by the back-end uplink backup device, and the front-end uplink primary device is replaced by the front-end uplink backup device, to complete the insertion loss calibration of the first uplink channel of the radio frequency forwarding system.

[0123] Specifically, the first insertion loss reference value is the difference between the first power value and the uplink signal power value.

[0124] It should be noted that the first insertion loss reference value can be used as a guide during subsequent actual transmission. For example, during actual transmission, the power value of the signal output by the first signal generator or the power value measured by the second spectrum analyzer can be calculated based on the first insertion loss reference value.

[0125] Downlink insertion loss calibration steps: Perform insertion loss calibration on the first downlink channel.

[0126] Preferably, the downlink insertion loss calibration step includes: Step S301: Setting the first downlink channel to a second primary state via the RF relay system control software, the second primary state indicates that RF signals are relayed through the front-end downlink primary equipment, fiber optic cable, and back-end downlink primary equipment, and setting the third attenuation value of the adjustable attenuator in the front-end downlink primary equipment and the back-end downlink primary equipment to 0; Step S302: The second signal generator outputs a second single-carrier signal, the frequency of which is equal to the carrier frequency of the transponder's transmitted signal, and the second power value of which is equal to the output signal power value of the power amplifier of the Mars probe telemetry and control downlink channel; Step S303: Measuring the downlink signal power transmitted by the orbiter transmitting antenna and received by the downlink relay receiving antenna and relayed by the first downlink channel on the first spectrum analyzer, recording the downlink signal power value, and obtaining the second insertion loss reference value of the first downlink channel based on the second power value and the downlink signal power value; Step S304: Based on the second insertion loss value... Adjust the third attenuation value of the adjustable attenuators of the front-end downlink primary device and the back-end downlink primary device, and measure the downlink signal power on the first spectrum analyzer in the back-end RF forwarding room, so that the downlink signal power received on the first spectrum analyzer is equal to the median value of the dynamic range of the received signal of the Mars probe RF test equipment, and record the third attenuation value; Step S305: Set the first downlink channel to the second backup state through the control software of the RF forwarding system. The second backup state is characterized by RF signal forwarding through the front-end downlink backup device, fiber optic cable and back-end downlink backup device, and set the fourth attenuation value of the adjustable attenuators in the front-end downlink backup device and the back-end downlink backup device to 0; Step S306: Repeat steps S302-S304, wherein, during the repeated execution, the front-end downlink primary device in steps S302-S304 is replaced by the front-end downlink backup device, and the back-end downlink primary device is replaced by the back-end downlink backup device, to complete the insertion loss calibration of the first downlink channel of the RF forwarding system.

[0127] Specifically, the second insertion loss reference value is the difference between the second power value and the downlink signal power value.

[0128] It should be noted that the second insertion loss reference value can be used as a guide during subsequent actual transmission. For example, during actual transmission, the power value of the signal output by the second signal generator or the power value measured by the first spectrum analyzer can be calculated based on the second insertion loss reference value.

[0129] Functional test preparation steps: Prepare the status of the second uplink and second downlink channels on the RF transceiver system.

[0130] Preferably, the functional test preparation steps include: a second connection sub-step for the test equipment in the back-end RF relay room: connecting the uplink remote control transmitting port of the Mars probe RF test equipment to the uplink channel entrance of the back-end RF relay cabinet, and connecting the downlink telemetry receiving port of the Mars probe RF test equipment to the downlink channel exit of the back-end RF relay cabinet; a second connection sub-step for the test equipment in the front-end RF relay room: connecting the uplink channel exit of the front-end RF relay cabinet to the uplink relay transmitting antenna on the fixed tower platform via an RF cable, and connecting the downlink channel entrance of the front-end RF relay cabinet to the downlink relay receiving antenna on the fixed tower platform via an RF cable; a second connection sub-step for the on-board products: placing the orbiter transmitting antenna and the orbiter receiving antenna on the rotating platform in the fairing area, connecting the orbiter transmitting antenna to the downlink telemetry signal transmitting port of the power amplifier electrical components of the Mars probe in the front-end RF relay room via an RF cable, connecting the orbiter receiving antenna to the uplink remote control signal receiving port of the transponder electrical components in the front-end RF relay room via an RF cable, and connecting the transponder electrical components, the power amplifier electrical components, and the ground testing equipment.

[0131] Specifically, Figure 3 This is a schematic diagram of the testable structure of the present invention, such as... Figure 3 As shown, the uplink remote control transmitting port of the Mars probe RF test equipment is connected to the uplink channel entrance of the back-end RF repeater cabinet, and the downlink telemetry receiving port of the Mars probe RF test equipment is connected to the downlink channel exit of the back-end RF repeater cabinet; the uplink channel exit of the front-end RF repeater cabinet is connected to the uplink repeater transmitting antenna on the fixed tower platform via an RF cable, and the downlink channel entrance of the front-end RF repeater cabinet is connected to the downlink repeater receiving antenna on the fixed tower platform via an RF cable; the orbiter transmitting antenna and orbiter receiving antenna are placed on the rotating platform in the fairing area, the Mars probe transmitting antenna is connected to the downlink telemetry signal transmitting port of the Mars probe power amplifier electrical components in the front-end RF repeater room via an RF cable, the Mars probe receiving antenna is connected to the uplink remote control signal receiving port of the Mars probe transponder electrical components in the front-end RF repeater room via an RF cable, and the Mars probe transponder electrical components, power amplifier electrical components, and ground testing equipment in the front-end RF repeater room are connected.

[0132] Uplink function test steps: Perform remote control signal forwarding function test on the second uplink channel.

[0133] Preferably, the uplink function test steps include: Step S501: Setting the second uplink channel to a third primary state, the third primary state indicates that radio frequency signals are forwarded through the back-end uplink primary equipment, fiber optic cable, and front-end uplink primary equipment, and setting the fifth attenuation value of the adjustable attenuator in the back-end uplink primary equipment and the front-end uplink primary equipment to the first attenuation value; Step S502: Powering on the transponder electrical components through ground testing equipment; Step S503: The Mars probe radio frequency test equipment in the back-end radio frequency forwarding room outputs an uplink remote control signal, the third power value of the uplink remote control signal being equal to the midpoint of the input power range of the back-end uplink primary equipment; Step S504: Monitoring the transponder's working status through ground testing equipment to confirm that the transponder's forwarding of the second uplink channel and the transmission of the uplink forwarding transmitting antenna, and the reception and locking of the uplink remote control signal received by the surround receiving antenna are normal; Step S505: The Mars probe radio frequency test equipment continuously sends data content multiple times. A fixed first remote control command frame is obtained, and a second remote control command frame is received and demodulated from the uplink remote control signal by the transponder through the ground test equipment. Error detection is performed on the data content of the remote control command corresponding to the second remote control command frame to confirm that the data content of the received remote control command is error-free. Step S506: The control software of the radio frequency forwarding system sets the second uplink channel to the third backup state. The third backup state is characterized by forwarding the radio frequency signal through the back-end uplink backup device, fiber optic cable and front-end uplink backup device, and the sixth attenuation value of the adjustable attenuator in the back-end uplink backup device and the front-end uplink backup device is set to the second attenuation value. Step S507: Steps S502-S505 are repeated. During the repeated execution, the front-end uplink master device in steps S502-S505 is replaced by the front-end uplink backup device, and the back-end uplink master device is replaced by the back-end uplink backup device to complete the forwarding function test of the second uplink channel of the radio frequency forwarding system.

[0134] Preferably, step S505 includes: pre-setting a third remote control command frame whose data content is consistent with the first remote control command frame sent by the Mars probe radio frequency test equipment as a comparison benchmark, and performing a bit-by-bit consistency comparison between each second remote control command frame and the third remote control command frame.

[0135] Downlink function test procedure: Perform telemetry signal forwarding function test on the second downlink channel.

[0136] Preferably, the downlink function test steps include: Step S601: Setting the second downlink channel to the fourth primary state through the control software of the RF forwarding system. The fourth primary state is characterized by RF signal forwarding through the front-end downlink primary equipment, fiber optic cable, and back-end downlink primary equipment, and setting the seventh attenuation value of the adjustable attenuator in the front-end downlink primary equipment and the back-end downlink primary equipment to the third attenuation value; Step S602: Powering on the transponder electromechanical components and power amplifier electromechanical components through the ground testing equipment, and setting the downlink transmit port of the transponder electromechanical components, and outputting downlink telemetry signals through the power amplifier electromechanical components; Step S603: Monitoring the reception status of the downlink telemetry signal on the Mars probe RF test equipment to confirm that the Mars probe RF test equipment receives and locks on the downlink telemetry signal normally; Step S604: Continuously outputting the first telemetry frame with fixed data content through the ground testing equipment, and transmitting it through the transponder electromechanical components. Modulation output; Step S605: The Mars probe RF test equipment receives the telemetry signal corresponding to the first telemetry frame and demodulates the telemetry data, performs error detection on the telemetry data, and confirms that the received telemetry data has no errors; Step S606: The control software of the RF forwarding system sets the second downlink channel to the fourth backup state. The fourth backup state is characterized by forwarding RF signals through the front-end downlink backup device, fiber optic cable, and back-end downlink backup device, and the eighth attenuation value of the adjustable attenuator in the front-end downlink backup device and the back-end downlink backup device is set to the fourth attenuation value; Step S607: Repeat steps S602-S605, wherein, during repeated execution, the front-end uplink main and secondary devices in steps S602-S605 are replaced by the front-end uplink backup device, and the back-end uplink main and secondary devices are replaced by the back-end uplink backup device, completing the forwarding function test of the second downlink channel telemetry signal of the RF forwarding system.

[0137] Preferably, step S605 includes: pre-setting a second telemetry frame whose data content is consistent with the first telemetry frame sent by the ground inspection equipment as a comparison benchmark, and performing a bit-by-bit consistency comparison between each third telemetry frame demodulated from the telemetry signal forwarded from the radio frequency relay system and the second telemetry frame used as the comparison benchmark.

[0138] It is important to know that both the orbiter's transmitting and receiving antennas are prototype antennas, with technical specifications consistent with those of the Mars probe's prototype antenna. When placed on the rotating platform, the antenna supports ensure that the spatial position and orientation of the orbiter's transmitting and receiving antennas are consistent with the spatial position and orientation of the prototype antenna when the Mars probe is placed inside the fairing on the day of the actual launch. This simulates the state of the orbiter's transmitting antenna transmitting telemetry signals and the orbiter's receiving antenna receiving remote control signals on the day of the actual launch.

[0139] The technical specifications include at least one of the following: polarization mode, operating frequency band, antenna gain, and beamwidth.

[0140] Specifically, the ground inspection equipment is connected to the transponder electrical components and power amplifier electrical components via low-frequency cables, providing power to the transponder electrical components and power amplifier electrical components, controlling the operation of the transponder electrical components and power amplifier electrical components and monitoring their operating status, and simulating the Mars probe's integrated electronic computer sending telemetry data to the transponder and receiving uplink remote control command data demodulated by the transponder.

[0141] This invention provides a test system for the radio frequency repeater system in the launch area of ​​a Mars probe launch site, comprising:

[0142] Calibration preparation module: Performs state preparation for the first uplink and first downlink channels on the radio frequency forwarding system.

[0143] Preferably, the calibration preparation module includes:

[0144] The first connection submodule of the test equipment in the back-end RF repeater cabinet connects the first signal generator to the uplink channel entrance of the back-end RF repeater cabinet and the first spectrum analyzer to the downlink channel exit of the back-end RF repeater cabinet.

[0145] The first connection submodule of the test equipment in the front-end RF repeater cabinet connects the uplink channel outlet of the front-end RF repeater cabinet to the uplink repeater transmitting antenna on the fixed tower platform via an RF cable, and connects the downlink channel inlet of the front-end RF repeater cabinet to the downlink repeater receiving antenna on the fixed tower platform via an RF cable.

[0146] The first connection submodule of the on-board product: The circulator transmitting antenna and the circulator receiving antenna are placed on the rotating platform in the fairing area. The circulator transmitting antenna is connected to the second signal generator in the front-end RF transceiver room via an RF cable. The circulator receiving antenna is connected to the second spectrum analyzer in the front-end RF transceiver room via an RF cable.

[0147] Uplink insertion loss calibration module: Insertion loss calibration is performed on the first uplink channel.

[0148] Preferably, the uplink insertion loss calibration module includes:

[0149] Submodule M201: The control software of the radio frequency forwarding system sets the first uplink channel to the first primary state. The first primary state is characterized by forwarding radio frequency signals through the back-end uplink primary equipment, optical fiber cable and front-end uplink primary equipment, and setting the first attenuation value of the adjustable attenuator in the back-end uplink primary equipment and the front-end uplink primary equipment to 0.

[0150] Submodule M202: The first signal generator in the back-end RF relay room outputs the first single-carrier signal. The frequency of the first single-carrier signal is equal to the carrier frequency of the received signal of the Mars probe's transponder. The first power value of the first single-carrier signal is equal to the midpoint of the input power range of the back-end uplink primary device.

[0151] Submodule M203: Measure the uplink signal power transmitted via the first uplink channel forwarding and uplink forwarding transmitting antenna and received by the surround receiving antenna on the second spectrum analyzer in the front-end RF forwarding room, record the uplink signal power value, and obtain the first insertion loss reference value of the first uplink channel based on the first power value and the uplink signal power value.

[0152] Submodule M204: Adjusts the first attenuation value of the adjustable attenuator of the back-end uplink primary device and the front-end uplink primary device according to the first insertion loss reference value, and measures the uplink signal power on the second spectrum analyzer so that the uplink signal power received on the second spectrum analyzer is equal to the median value of the dynamic range of the received signal of the transponder, and records the first attenuation value.

[0153] Submodule M205: The control software of the radio frequency forwarding system sets the first uplink channel to the first backup state. The first backup state is characterized by forwarding radio frequency signals through the back-end uplink backup device, fiber optic cable and front-end uplink backup device, and setting the second attenuation value of the adjustable attenuator in the back-end uplink backup device and the front-end uplink backup device to 0.

[0154] Submodule M206: Repeat steps S202-S204. During repeated execution, the back-end uplink primary device in steps S202-S204 is replaced with the back-end uplink backup device, and the front-end uplink primary device is replaced with the front-end uplink backup device, thus completing the insertion loss calibration of the first uplink channel of the RF forwarding system.

[0155] Downlink insertion loss calibration module: Insertion loss calibration is performed on the first downlink channel.

[0156] Preferably, the downlink insertion loss calibration module includes:

[0157] Submodule M301: The first downlink channel is set to the second primary state through the radio frequency forwarding system control software. The second primary state indicates that radio frequency signals are forwarded through the front-end downlink primary equipment, fiber optic cable and back-end downlink primary equipment, and the third attenuation value of the adjustable attenuator in the front-end downlink primary equipment and the back-end downlink primary equipment is set to 0.

[0158] Submodule M302: The second signal generator outputs a second single-carrier signal. The frequency of the second single-carrier signal is equal to the carrier frequency of the transponder's transmitted signal, and the second power value of the second single-carrier signal is equal to the output signal power value of the power amplifier of the Mars probe's telemetry and control downlink channel.

[0159] Submodule M303: Measure the downlink signal power transmitted by the surround transmitting antenna and received by the downlink relay receiving antenna and forwarded by the first downlink channel on the first spectrum analyzer, record the downlink signal power value, and obtain the second insertion loss reference value of the first downlink channel based on the second power value and the downlink signal power value.

[0160] Submodule M304: Adjusts the third attenuation value of the adjustable attenuators of the front-end downlink main equipment and the back-end downlink main equipment according to the second insertion loss reference value, and measures the downlink signal power on the first spectrum analyzer in the back-end RF relay room, so that the downlink signal power received on the first spectrum analyzer is equal to the median value of the dynamic range of the received signal of the Mars probe RF test equipment, and records the third attenuation value.

[0161] Submodule M305: The control software of the radio frequency forwarding system sets the first downlink channel to the second backup state. The second backup state is characterized by radio frequency signal forwarding through the front-end downlink backup device, fiber optic cable and back-end downlink backup device, and sets the fourth attenuation value of the adjustable attenuator in the front-end downlink backup device and the back-end downlink backup device to 0.

[0162] Submodule M306: Repeat steps S302-S304. During repeated execution, the front-end downlink primary device in steps S302-S304 is replaced with the front-end downlink backup device, and the back-end downlink primary device is replaced with the back-end downlink backup device, thus completing the insertion loss calibration of the first downlink channel of the radio frequency forwarding system.

[0163] Functional test preparation module: Prepare the status of the second uplink and second downlink channels on the RF transceiver system.

[0164] Preferably, the functional test preparation module includes:

[0165] The second connection submodule of the test equipment in the back-end RF repeater: connects the uplink remote control transmitting port of the Mars probe RF test equipment to the uplink channel entrance of the back-end RF repeater cabinet, and connects the downlink telemetry receiving port of the Mars probe RF test equipment to the downlink channel exit of the back-end RF repeater cabinet.

[0166] The second connection submodule of the test equipment in the front-end RF repeater cabinet connects the uplink channel outlet of the front-end RF repeater cabinet to the uplink repeater transmitting antenna on the fixed tower platform via an RF cable, and connects the downlink channel inlet of the front-end RF repeater cabinet to the downlink repeater receiving antenna on the fixed tower platform via an RF cable.

[0167] The second connection submodule of the onboard product: The orbiter transmitting antenna and the orbiter receiving antenna are placed on the rotating platform in the fairing area. The orbiter transmitting antenna is connected to the downlink telemetry signal transmitting port of the power amplifier electrical component of the Mars rover in the front-end radio frequency transponder room via an RF cable. The orbiter receiving antenna is connected to the uplink remote control signal receiving port of the transponder electrical component in the front-end radio frequency transponder room via an RF cable. The transponder electrical component, the power amplifier electrical component, and the ground detection equipment are connected.

[0168] Uplink Function Test Module: Perform remote control signal forwarding function test on the second uplink channel.

[0169] Preferably, the uplink function testing module includes:

[0170] Submodule M501: Sets the second uplink channel to the third primary state. The third primary state indicates that the radio frequency signal is forwarded through the back-end uplink primary device, fiber optic cable and front-end uplink primary device, and sets the fifth attenuation value of the adjustable attenuator in the back-end uplink primary device and the front-end uplink primary device to the first attenuation value.

[0171] Submodule M502: Powers the transponder electrical components via ground testing equipment.

[0172] Submodule M503: The Mars probe RF test equipment in the back-end RF relay room outputs an uplink remote control signal. The third power value of the uplink remote control signal is equal to the midpoint of the input power range of the back-end uplink main device.

[0173] Submodule M504: Monitors the working status of the transponder through ground testing equipment to confirm that the transponder is transmitting and locking the uplink remote control signal transmitted by the second uplink channel forwarding and uplink forwarding transmitting antenna, and received by the surround receiving antenna, and that the reception and locking of the uplink remote control signal are normal.

[0174] Submodule M505: The Mars probe radio frequency test equipment continuously sends a first remote control command frame with fixed data content multiple times, and receives and demodulates a second remote control command frame from the uplink remote control signal through the ground test equipment transponder. It performs bit error detection on the data content of the remote control command corresponding to the second remote control command frame to confirm that the received remote control command data content is error-free.

[0175] Submodule M506: The control software of the radio frequency forwarding system sets the second uplink channel to the third backup state. The third backup state is characterized by forwarding radio frequency signals through the back-end uplink backup equipment, fiber optic cable and front-end uplink backup equipment, and setting the sixth attenuation value of the adjustable attenuator in the back-end uplink backup equipment and the front-end uplink backup equipment to the second attenuation value.

[0176] Submodule M507: Repeat steps S502-S505. During repeated execution, the front-end uplink primary and secondary devices in steps S502-S505 are replaced with front-end uplink backup devices, and the back-end uplink primary and secondary devices are replaced with back-end uplink backup devices to complete the forwarding function test of the second uplink channel of the radio frequency forwarding system.

[0177] Preferably, submodule M505 includes:

[0178] A third remote control command frame, whose data content is consistent with that of the first remote control command frame sent by the radio frequency test equipment of the Mars probe, is pre-set as the comparison benchmark. Each second remote control command frame is compared bit by bit with the third remote control command frame.

[0179] Downlink Function Test Module: Perform telemetry signal forwarding function test on the second downlink channel.

[0180] Preferably, the downlink function test module includes:

[0181] Submodule M601: The control software of the radio frequency forwarding system sets the second downlink channel to the fourth primary state. The fourth primary state is characterized by radio frequency signal forwarding through the front-end downlink primary equipment, fiber optic cable and back-end downlink primary equipment, and sets the seventh attenuation value of the adjustable attenuator in the front-end downlink primary equipment and the back-end downlink primary equipment to the third attenuation value.

[0182] Submodule M602: Powers the transponder electrical components and power amplifier electrical components through the ground testing equipment, and sets the downlink transmit port of the transponder electrical components, which outputs downlink telemetry signals through the power amplifier electrical components.

[0183] Submodule MS603: Monitors the reception status of downlink telemetry signals on the Mars probe's RF test equipment to confirm that the Mars probe's RF test equipment is receiving and locking down the downlink telemetry signals normally.

[0184] Submodule M604: The first telemetry frame with fixed data content is continuously output through the ground inspection equipment and modulated by the response electromechanical components.

[0185] Submodule M605: The Mars probe radio frequency test equipment receives the telemetry signal corresponding to the first telemetry frame and demodulates the telemetry data. It performs error detection on the telemetry data and confirms that the received telemetry data is error-free.

[0186] Submodule M606: The control software of the radio frequency forwarding system sets the second downlink channel to the fourth backup state. The fourth backup state is characterized by radio frequency signal forwarding through the front-end downlink backup device, fiber optic cable and back-end downlink backup device, and sets the eighth attenuation value of the adjustable attenuator in the front-end downlink backup device and the back-end downlink backup device to the fourth attenuation value.

[0187] Submodule M607: Repeat steps S602-S605. During repeated execution, the front-end uplink primary and secondary devices in steps S602-S605 are replaced with front-end uplink backup devices, and the back-end uplink primary and secondary devices are replaced with back-end uplink backup devices to complete the forwarding function test of the second downlink channel telemetry signal of the radio frequency forwarding system.

[0188] Preferably, submodule M605 includes:

[0189] A second telemetry frame, whose data content is consistent with the first telemetry frame sent by the ground inspection equipment, is pre-set as a comparison benchmark. Each third telemetry frame demodulated from the telemetry signal forwarded by the radio frequency relay system is compared bit by bit with the second telemetry frame used as the comparison benchmark.

[0190] It is important to know that both the orbiter's transmitting and receiving antennas are prototype antennas, with technical specifications consistent with those of the Mars probe's prototype antenna. When placed on the rotating platform, the antenna supports ensure that the spatial position and orientation of the orbiter's transmitting and receiving antennas are consistent with the spatial position and orientation of the prototype antenna when the Mars probe is placed inside the fairing on the day of the actual launch. This simulates the state of the orbiter's transmitting antenna transmitting telemetry signals and the orbiter's receiving antenna receiving remote control signals on the day of the actual launch.

[0191] The technical specifications include at least one of the following: polarization mode, operating frequency band, antenna gain, and beamwidth.

[0192] Specifically, the ground inspection equipment is connected to the transponder electrical components and power amplifier electrical components via low-frequency cables, providing power to the transponder electrical components and power amplifier electrical components, controlling the operation of the transponder electrical components and power amplifier electrical components and monitoring their operating status, and simulating the Mars probe's integrated electronic computer sending telemetry data to the transponder and receiving uplink remote control command data demodulated by the transponder.

[0193] This invention enables testing of the insertion loss and RF signal forwarding function of the uplink primary backup channel and downlink primary backup channel of the RF forwarding system in the launch area of ​​the Mars probe before launch. It fully verifies the adaptability of the launch site RF forwarding system to forward uplink remote control signals and downlink telemetry signals from the Mars probe, and provides guidance for the forwarding scheme on the actual launch day. This includes the attenuation settings of the downlink channel of the uplink channel of the RF forwarding system on the actual launch day, the placement of the uplink forwarding transmitting antenna and the downlink forwarding receiving antenna, etc., to ensure smooth communication of uplink remote control signals and downlink telemetry signals between the Mars probe located at the launch tower and the test equipment in the remote test facility on the actual launch day.

[0194] Those skilled in the art will understand that, besides implementing the system, apparatus, and their modules provided by this invention in purely computer-readable program code, the same program can be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system, apparatus, and their modules provided by this invention can be considered a hardware component, and the modules that implement various programs within it can also be considered structures within the hardware component; alternatively, modules that implement various functions can be considered both software programs implementing the method and structures within the hardware component.

[0195] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A test method for a radio frequency transponder system in the launch area of ​​a Mars probe launch site, characterized in that, include: Calibration preparation steps: Perform state preparation for the first uplink channel and the first downlink channel on the radio frequency forwarding system; Uplink insertion loss calibration steps: Perform insertion loss calibration on the first uplink channel; Downlink insertion loss calibration steps: Perform insertion loss calibration on the first downlink channel; Functional test preparation steps: Perform state preparation for the second uplink and second downlink channels on the radio frequency forwarding system; Uplink function test steps: Perform remote control signal forwarding function test on the second uplink channel; Downlink function test procedure: Perform telemetry signal forwarding function test on the second downlink channel; The functional test preparation steps include: The second connection sub-step of the test equipment in the back-end radio frequency relay room: connect the uplink remote control transmitting port of the Mars probe radio frequency test equipment to the uplink channel entrance of the back-end radio frequency relay cabinet, and connect the downlink telemetry receiving port of the Mars probe radio frequency test equipment to the downlink channel exit of the back-end radio frequency relay cabinet; The second connection sub-step of the test equipment in the front-end radio frequency repeater room: connect the uplink channel outlet of the front-end radio frequency repeater cabinet to the uplink repeater transmitting antenna on the fixed tower platform via radio frequency cable, and connect the downlink channel inlet of the front-end radio frequency repeater cabinet to the downlink repeater receiving antenna on the fixed tower platform via radio frequency cable; The second connection step for products on the Mars probe: Place the orbiter transmitting antenna and the orbiter receiving antenna on the rotating platform in the fairing area; connect the orbiter transmitting antenna to the downlink telemetry signal transmitting port of the power amplifier electrical component of the Mars probe in the front-end radio frequency relay room via an RF cable; connect the orbiter receiving antenna to the uplink remote control signal receiving port of the transponder electrical component in the front-end radio frequency relay room via an RF cable; and connect the transponder electrical component, the power amplifier electrical component, and the ground detection equipment.

2. The test method for the radio frequency transponder system of the Mars probe launch site according to claim 1, characterized in that, The uplink function testing steps include: Step S501: Set the second uplink channel to the third primary state. The third primary state indicates that radio frequency signals are forwarded through the back-end uplink primary device, optical fiber cable and front-end uplink primary device, and set the fifth attenuation value of the adjustable attenuator in the back-end uplink primary device and the front-end uplink primary device to the first attenuation value. Step S502: Power on the transponder electromechanical components using the ground testing equipment; Step S503: The Mars probe radio frequency test equipment in the back-end radio frequency relay room outputs an uplink remote control signal, and the third power value of the uplink remote control signal is equal to the median value of the input power range of the back-end uplink main device. Step S504: Monitor the working status of the transponder through the ground inspection equipment to confirm that the transponder is forwarding to the second uplink channel and transmitting through the uplink forwarding transmitting antenna, and that the reception and locking of the uplink remote control signal received by the surround receiving antenna is normal; Step S505: The Mars probe radio frequency test equipment continuously sends a first remote control command frame with fixed data content multiple times, and receives a second remote control command frame received and demodulated from the uplink remote control signal by the transponder through the ground test equipment, performs bit error detection on the data content of the remote control command corresponding to the second remote control command frame, and confirms that the data content of the received remote control command is error-free. Step S506: The control software of the radio frequency forwarding system sets the second uplink channel to the third backup state. The third backup state is characterized by forwarding radio frequency signals through the back-end uplink backup device, the optical fiber cable and the front-end uplink backup device, and setting the sixth attenuation value of the adjustable attenuator in the back-end uplink backup device and the front-end uplink backup device to the second attenuation value. Step S507: Repeat steps S502-S505, wherein, during the repeated execution, the front-end uplink primary device in steps S502-S505 is replaced by the front-end uplink backup device, and the back-end uplink primary device is replaced by the back-end uplink backup device, thereby completing the forwarding function test of the second uplink channel of the radio frequency forwarding system.

3. The test method for the radio frequency transponder system of the Mars probe launch site according to claim 1, characterized in that, The downlink function testing steps include: Step S601: The control software of the radio frequency forwarding system sets the second downlink channel to the fourth primary state. The fourth primary state is characterized by radio frequency signal forwarding through the front-end downlink primary device, optical fiber cable and back-end downlink primary device, and the seventh attenuation value of the adjustable attenuator in the front-end downlink primary device and the back-end downlink primary device is set to the third attenuation value. Step S602: Power on the transponder electrical components and the power amplifier electrical components through the ground detection equipment, and set the downlink transmission port of the transponder electrical components, and output downlink telemetry signals through the power amplifier electrical components; Step S603: Monitor the reception status of the downlink telemetry signal on the Mars probe radio frequency test equipment to confirm that the Mars probe radio frequency test equipment is receiving and locking the downlink telemetry signal normally; Step S604: The ground inspection equipment continuously outputs a first telemetry frame with fixed data content, which is then modulated and output by the response electromechanical components; Step S605: The Mars probe radio frequency test equipment receives the telemetry signal corresponding to the first telemetry frame and demodulates the telemetry data, performs error detection on the telemetry data, and confirms that the received telemetry data has no errors. Step S606: The control software of the radio frequency forwarding system sets the second downlink channel to the fourth backup state. The fourth backup state is characterized by radio frequency signal forwarding through the front-end downlink backup device, the optical fiber cable and the back-end downlink backup device, and the eighth attenuation value of the adjustable attenuator in the front-end downlink backup device and the back-end downlink backup device is set to the fourth attenuation value. Step S607: Repeat steps S602-S605, wherein, during the repeated execution, the front-end uplink primary and secondary devices in steps S602-S605 are replaced with front-end uplink backup devices, and the back-end uplink primary and secondary devices are replaced with back-end uplink backup devices, thereby completing the forwarding function test of the second downlink channel telemetry signal of the radio frequency forwarding system.

4. The test method for the radio frequency transponder system of the Mars probe launch site according to claim 2, characterized in that, Step S505 includes: A third remote control command frame, whose data content is consistent with that of the first remote control command frame sent by the radio frequency test equipment of the Mars probe, is pre-set as a comparison benchmark. Each second remote control command frame is compared bit by bit with the third remote control command frame.

5. The test method for the radio frequency transponder system of the Mars probe launch site according to claim 3, characterized in that, Step S605 includes: A second telemetry frame, whose data content is consistent with the first telemetry frame sent by the ground inspection equipment, is pre-set as a comparison benchmark. Each third telemetry frame demodulated from the telemetry signal forwarded by the radio frequency relay system is compared bit by bit with the second telemetry frame used as the comparison benchmark.

6. A test system for a radio frequency repeater system in the launch area of ​​a Mars probe launch site, characterized in that, The test method for the radio frequency transponder system of the launch area of ​​the Mars probe launch site according to any one of claims 1 to 5 includes: Calibration preparation module: performs state preparation for the first uplink channel and the first downlink channel on the radio frequency forwarding system; Uplink insertion loss calibration module: Performs insertion loss calibration on the first uplink channel; Downlink insertion loss calibration module: Performs insertion loss calibration on the first downlink channel; Functional test preparation module: performs state preparation for the second uplink and second downlink channels on the radio frequency forwarding system; Uplink Function Test Module: Performs remote control signal forwarding function test on the second uplink channel; Downlink Function Test Module: Perform telemetry signal forwarding function test on the second downlink channel.

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