Ground vacuum calibration test method and system based on multi-channel transceiver module

Abstract

The invention relates to the field of space remote sensing satellites, and provides a ground vacuum calibration test method based on a multi-channel transceiver module, which comprises the following steps: determining a calibration loop power parameter and a link gain parameter based on an internal calibration loop gain formula, and establishing a relation model between each parameter and an internal calibration coefficient k; configuring a multi-channel transceiver module; starting a test, collecting calibration loop power parameters and link gain parameters output by the tested equipment in real time, and synchronously recording environmental conditions during the test; and calculating an internal calibration coefficient k based on the acquired calibration loop power parameter, and calculating a corresponding link gain parameter. By accurately measuring transmitting power, receiving gain and calibration loop power parameters, high-precision gain measurement can be realized under complex environmental conditions, an accurate internal calibration coefficient is generated, and radiation calibration gain compensation of a satellite-borne system is supported.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of space remote sensing satellites, and in particular to a ground vacuum calibration test method and system based on a multi-channel transceiver module. BACKGROUND

[0002] Synthetic Aperture Radar (SAR) is a kind of high-resolution imaging radar, which is widely used in ground monitoring, resource investigation, disaster warning and other fields. The radiation accuracy of SAR image is a key technical index to guarantee the imaging quality and data application value. In order to ensure the radiation accuracy of SAR image, the system needs to be calibrated through radiation calibration. The existing satellite-borne SAR radiation calibration method usually includes relative calibration (internal calibration) and absolute calibration, wherein the internal calibration is used to calibrate the gain stability of the instrument during the imaging period of the SAR on-orbit, mainly involving the measurement of average transmit power and system receive gain.

[0003] The existing SAR internal calibration system is composed of an internal calibrator, a reference calibration signal sampling and transmission network, and an antenna subsystem calibration signal sampling and transmission network. The internal calibrator is used to make relative measurement on the transmission characteristic change of the radar transceiver channel, and to provide relative calibration data required for radiation correction and system error compensation for the signal processor. Through full-array transmit loop calibration, full-array receive loop calibration and reference loop calibration, the transmit loop transfer function Kt, the receive loop transfer function Kr and the reference loop transfer function Kc are obtained respectively, and the internal calibration gain is derived therefrom, which is used to correct the radiation accuracy of the radar system.

[0004] Such existing technology still has the problems of limited accuracy, lack of multi-channel high-precision engineering measurement capability, and lack of measured data support for the change of internal calibration coefficients under different environmental conditions in ground vacuum calibration test, which is difficult to meet the requirements of high-precision SAR system for ground calibration data, and also affects the reliability and accuracy of satellite-borne radiation calibration. SUMMARY

[0005] In view of the above problems, the present application aims to provide a ground vacuum calibration test method and system based on a high-precision multi-channel transceiver module, which solves the problems of insufficient accuracy of existing ground calibration, inaccurate measurement of link gain state and lack of satellite-borne gain compensation data. The above application purpose of the present application is realized by the following technical scheme: The present application provides a ground vacuum calibration test method based on a multi-channel transceiver module, comprising the steps of, Step S1: In the test preparation stage, the scaling loop power parameters and the link gain parameters are determined based on the internal scaling loop gain formula, and the relationship model between the parameters and the internal scaling coefficient k is established; the scaling loop power parameters include the transmit scaling loop output power P1, the receive scaling loop output power P2 and the reference scaling loop output power P3, and the link gain parameters include the transmit power P t and the receive gain G r ; Step S2: Configure a multi-channel transceiver module, including two receive ports and one transmit port; the transmit port is connected with the transmit unit of the device under test, and outputs a multi-channel radio frequency excitation signal through a power division network; the receive port 1 is used to receive the scaling loop power parameters and the receive gain Gr, and the receive port 2 is used to receive the transmit power Pt output by the device under test; Step S3: Start the test in the ground vacuum environment, the transmit port transmits a radio frequency excitation signal, the multi-channel transceiver module collects the scaling loop power parameters and the link gain parameters output by the device under test in real time, and synchronously records the environmental conditions during the test, including the temperature and the vacuum degree; Step S4: Based on the scaling loop power parameters collected in step S3, the internal scaling coefficient k is calculated according to the relationship model in step S1, and the corresponding link gain parameters in the on-orbit operation of the satellite are calculated.

[0006] Further, step S1 includes, Step S11: Under the reference environmental conditions, the product reference value of the transmit power Pt and the receive gain Gr is calculated based on the scaling loop power parameters and the internal scaling loop gain formula; Step S12: Under the changing environmental conditions, the product actual value of the transmit power Pt and the receive gain Gr is calculated based on the scaling loop power parameters, the scaling loop power parameter variation and the internal scaling loop gain formula; Step S13: Based on the product reference value and the product actual value, the product variation of the transmit power Pt and the receive gain Gr is calculated, and the internal scaling coefficient k is calculated in combination with the scaling loop power parameter variation.

[0007] Further, the calculation formula of step S11 is: ; Wherein, P t is the transmit power, G r is the receive gain, is the transmit scaling loop output power under the reference environmental conditions, is the receive scaling loop output power under the reference environmental conditions, is the reference scaling loop output power under the reference environmental conditions, is a constant, a is the parameter value under the reference environment condition, which is used as a reference benchmark.

[0008] Further, the calculation formula of step S11 is, ; wherein P t is the transmit power, G r is the receive gain, is the transmit calibration loop output power under the changing environment condition, is the receive calibration loop output power under the changing environment condition, is the reference calibration loop output power under the changing environment condition, , and are the parameter variation amounts of the respective calibration loops; is a constant, b is the measured parameter value under the changing environment condition, which is used to represent the corresponding gain state.

[0009] Further, the calculation formula of step S13 is, wherein, ; k is an internal calibration coefficient, , and are the parameter variation amounts of the respective calibration loops, is the actual value of the product of the transmit power Pt and the receive gain Gr combination.

[0010] Further, in step S2, the transmit port is connected to the transmit unit of the device under test, and outputs a multi-channel radio frequency excitation signal through a power division network; the receive port 1 is used to receive calibration loop power parameters, including: The radio frequency excitation signal is emitted by the device under test frequency modulation signal source, passes through a pre-amplifier, a circulator, a power division network, a TR component, a calibration synthesis network, an internal calibrator, and an analog receiver, and the transmit calibration loop output power is measured by the system receive port 1; The radio frequency excitation signal is emitted by the device under test frequency modulation signal source, passes through an internal calibrator, a calibration synthesis network, a TR component, a power division network, a circulator, and an analog receiver, and the receive receive calibration loop output power is measured by the receive port 1; The radio frequency excitation signal is emitted by the device under test frequency modulation signal source, passes through an internal calibrator and an analog receiver, and the reference calibration loop output power is measured by the receive port 1.

[0011] Further, in step S3, The radio frequency excitation signal is emitted by the device under test frequency modulation signal source, passes through a pre-amplifier, a circulator, a power division network, and a TR component, and the transmit power is measured by the receive port 2.

[0012] The transmitting port 1 transmits a signal by the excitation source through the directional coupler, the TR component of the measured device, the calibration synthesis network and the analog receiver, and the receiving gain is measured by the receiving port 1.

[0013] Based on the same inventive concept, the application provides a ground vacuum calibration test system based on a multi-channel transceiver module, which performs the ground vacuum calibration test method as described above, comprising, The configuration module is configured to determine the calibration loop power parameters and the link gain parameters based on the internal calibration loop gain formula in the test preparation stage, and establish a relationship model between each parameter and the internal calibration coefficient k; the calibration loop power parameters include the transmitting calibration loop output power P1, the receiving calibration loop output power P2 and the reference calibration loop output power P3, and the link gain parameters include the transmitting power P t And the receiving gain G r； The multi-channel transceiver module comprises two receiving ports and one transmitting port; the transmitting port is connected with the transmitting unit of the measured device and outputs multi-channel radio frequency excitation signals through the power division network; the receiving port 1 is used for receiving the calibration loop power parameters and the receiving gain Gr, and the receiving port 2 is used for receiving the transmitting power Pt output by the measured device; The data processing module is configured to start the test in the ground vacuum environment, the transmitting port transmits the radio frequency excitation signal, the multi-channel transceiver module collects the calibration loop power parameters and the link gain parameters output by the measured device in real time, and the environmental conditions during the test are recorded synchronously, including the temperature and the vacuum degree; based on the calibration loop power parameters collected in step S3, the internal calibration coefficient k is calculated according to the relationship model in step S1, and the corresponding link gain parameters in the on-orbit operation of the satellite are calculated.

[0014] Further, the data processing module comprises, The reference gain calculation unit is configured to calculate the product reference value of the transmitting power Pt and the receiving gain Gr based on the calibration loop power parameters and the internal calibration loop gain formula under the reference environmental condition; The actual gain calculation unit is configured to calculate the product actual value of the transmitting power Pt and the receiving gain Gr based on the calibration loop power parameters, the calibration loop power parameter variation and the internal calibration loop gain formula under the varying environmental condition; The internal calibration coefficient calculation unit is configured to calculate the product variation of the transmitting power Pt and the receiving gain Gr based on the product reference value and the product actual value, and calculate the internal calibration coefficient k in combination with the calibration loop power parameter variation.

[0015] Compared with the prior art, the application has at least one of the following beneficial effects: The ground vacuum calibration test method and system based on the high-precision multi-channel transceiver module provided by the application can realize high-precision gain measurement under complex environmental conditions, generate accurate internal calibration coefficients, support radiation calibration gain compensation of the satellite-borne system, and thus significantly improve the precision and reliability of the radiation calibration of the satellite-borne SAR system, and solve the problems of inaccurate calibration data and insufficient gain compensation in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The step flow chart of the ground vacuum calibration test method based on the high-precision multi-channel transceiver module of the application is shown in the figure. Figure 2 The working principle diagram of the program reliable loading and running method based on the DSP of the application is shown in the figure. Figure 3 The curve diagram of the calibration signal changing with time in the embodiment of the application is shown in the figure. Figure 4 The internal information flow diagram of the measured device in the embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0017] To make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are some embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0018] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the phrase "comprising" used in the specification of the application means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0019] First embodiment The SAR image radiation precision is calibrated through radiation calibration. The satellite-borne SAR radiation calibration consists of relative calibration (internal calibration) and absolute calibration. The internal calibration is mainly used for calibrating the gain stability of the instrument equipment of the SAR in each imaging time period in the on-orbit operation. The internal calibration mainly includes average transmission power and system receiving gain. The internal calibration system of a general SAR system mainly consists of an internal calibrator, a reference calibration signal sampling and transmission network, and an antenna subsystem calibration signal sampling and transmission network.

[0020] The internal calibrator is used for relative measurement of radar transceiver channel transmission characteristic changes, and provides relative calibration data for signal processor to provide radiation correction and system error compensation. The internal calibrator can obtain radar transmission pulse signals of the transmission channel, the receiving channel and the reference channel, and performs radar system internal calibration through three calibration loops. The full-array transmission loop calibration completes transmission signal sampling, obtains the transmission loop transfer function K t , performs transmission pulse waveform characteristic detection and transmission channel gain measurement; the full-array receiving loop calibration generates a receiving calibration signal, obtains the receiving loop transfer function K r , performs receiving loop detection and receiving channel front-end gain measurement; the reference loop calibration copies radar signals, and obtains the calibration reference loop transfer function K c . According to the characteristic functions in the same time period, the internal calibration gain can be obtained. (2) By using the characteristic functions in different time periods, the relative change value of the radar system gain can be obtained, so as to correct the radiation accuracy of the radar system. The inventor found in the process of developing ground vacuum calibration test research that the internal calibration gain calculation formula in the prior art often assumes that the transfer coefficient is a fixed value, for example, m=1, or directly omits the transfer coefficient term, without fully considering the transfer characteristic differences and power losses of different calibration loops and components in actual circuits. Since the transfer coefficients of different circuits and different loops are not the same in actual working state, simply defaulting the coefficient to 1 or ignoring it will lead to insufficient calibration accuracy and cannot truly reflect the gain state of the system transmission and receiving link. In addition, the prior art lacks data support for measuring the internal calibration coefficient k in different environmental conditions, and it is difficult to provide high-precision basic data set for on-orbit gain compensation of the satellite-borne system.

[0021] Therefore, the purpose of the present application is to provide a ground vacuum calibration test method based on a high-precision multi-channel transceiver system, which realizes the engineering actual measurement of the internal calibration coefficient by theoretical derivation of the internal calibration formula and use of the high-precision multi-channel transceiver system. The present application solves the problem of low ground vacuum calibration accuracy and provides data support for subsequent on-board calibration, and has the technical characteristics of high feasibility and high accuracy. The specific implementation is as follows:

[0022] As shown in , Figure 1 , 3 The present application provides a ground vacuum calibration test method based on a multi-channel transceiver module, which provides a practical solution for the actual engineering implementation of ground vacuum calibration test, and the steps include, Step S1: In the test preparation phase, the calibration loop power parameters and link gain parameters are determined based on the internal calibration loop gain formula, and a relationship model between each parameter and the internal calibration coefficient k is established. The calibration loop power parameters include the output power P1 of the transmit calibration loop, the output power P2 of the receive calibration loop, and the output power P3 of the reference calibration loop. The link gain parameters include the transmit power P... t and receive gain G r ; Specifically, under normal circumstances, the total gain of the internal calibration loop is: ; Among them, P t For transmission power, G r P1 is the output power of the transmit calibration circuit, P2 is the output power of the receive calibration circuit, P3 is the output power of the reference calibration circuit, and m is a constant.

[0023] Step S2: Configure a multi-channel transceiver module, including two receiving ports and one transmitting port; the transmitting port is connected to the transmitting unit of the device under test, and outputs multi-channel RF excitation signals after passing through a power divider network; receiving port 1 is used to receive the calibration circuit power parameters and receiving gain Gr, and receiving port 2 is used to receive the transmitting power Pt output by the device under test; Specifically, such as Figure 3 As shown, in the system, receiver port 1 is used to receive four radio frequency echo signals, namely transmit calibration P1, receive calibration P2, reference calibration P3, and receive gain G. r The echo signal received at receiving port 1, after passing through a directional coupler, is finally obtained by the amplitude and phase receiver to obtain the changes in amplitude and phase. In the system shown, receiving port 2 is used to receive the transmit power P of the device under test. t After passing through the directional coupler, the amplitude and phase changes are also obtained by the amplitude and phase receiver. In this system, the output signal from transmit port 1 is emitted by the excitation source, passes through the directional coupler to output the transmit power signal, and is then received by receive port 1 to obtain the complete receive gain G. r .

[0024] Step S3: Start the test in a vacuum environment on the ground. Transmit the radio frequency excitation signal through the transmitting port. Collect the calibration circuit power parameters and link gain parameters output by the device under test in real time through the multi-channel transceiver module, and record the environmental conditions during the test, including temperature and vacuum level. Specifically, such as Figure 4As shown, the transmission calibration loop P1 information flow is: Chirp1→HPA→CIR(1-2)→NT1→TRM(1-2)→NT2→IC(C-S1-S3-R)→RCVR1(2-3)→RX1, which finally receives and collects the relative amplitude and phase information of the P1 signal; the reception calibration loop P2 information flow is: Chirp1→HPA→CIR(1-3)→IC(T-S2-S1-C)→NT2→TRM(2-1)→NT1→CIR(2-3)→RCVR1(1-3)→RX1, which finally receives and collects the relative amplitude and phase information of the transmission power of the P2 signal; the reference calibration loop P3 information flow is: Chirp1→HPA→CIR(1-3)→IC(T-S2-S3-R)→RCVR1(2-3)→RX1, which finally receives and collects the relative amplitude and phase information of the P3 signal.

[0025] Wherein, Chirp1 is the frequency modulation signal source of the device under test, HPA is the pre-stage power amplifier, CIR is the circulator, NT is the power division and synthesis network, TRM is the TR component, IC is the internal calibrator, S is the switch, RCVR1 is the receiver of the device under test, DC is the directional coupler, and RCVR2 is the amplitude and phase receiver of the system.

[0026] As shown in Figure 4 , the P t information flow is: Chirp1→HPA→CIR(1-2)→NT1→TRM(1-3)→RX2, which finally receives and collects the relative amplitude and phase information of the P t signal. G r information flow is: Chirp2→DC2→TX1→TRM(3-1)→NT1→CIR(2-3)→RCVR1(2-3)→TR1, which finally receives and collects the relative amplitude and phase information of the G r signal. Wherein, Chirp2 is the excitation source of the system.

[0027] Step S4: Based on the calibration loop power parameters collected in step S3, the internal calibration coefficient k is calculated according to the relationship model of step S1, and the corresponding link gain parameters in the on-orbit operation of the satellite are calculated.

[0028] Specifically, in the process of on-orbit operation of the existing spaceborne SAR system, the link gain parameters such as the transmitting power Pt and the receiving gain Gr cannot be directly measured in real time due to the limitations of the closed structure of the spaceborne system, the complex environment and the limited device resources. On the one hand, the spaceborne device usually does not have a dedicated power measurement port or external access to power measurement instruments, and cannot collect the transmitting power signal in real time through a dedicated power measurement port or a directional coupler as in ground tests. On the other hand, an external excitation source and high-precision measurement equipment cannot be introduced in the spaceborne environment to complete the closed-loop measurement of the receiving link gain. Therefore, the internal calibration coefficient k dataset and the calibration loop power parameters obtained in the ground vacuum calibration test phase must be relied on as the basic data for the on-orbit calibration gain compensation of the spaceborne system, to ensure the high precision and reliability of the on-orbit radiometric calibration.

[0029] Further, the step S1 comprises, Step S11: calculating a product reference value of the transmitting power Pt and the receiving gain Gr based on the calibration loop power parameter and an internal calibration loop gain formula under the reference environmental condition; Step S12: calculating a product actual value of the transmitting power Pt and the receiving gain Gr based on the calibration loop power parameter, the calibration loop power parameter variation and the internal calibration loop gain formula under the varying environmental condition; Step S13: calculating a product variation of the transmitting power Pt and the receiving gain Gr based on the product reference value and the product actual value, and combining the calibration loop power parameter variation to calculate the internal calibration coefficient k.

[0030] Further, the calculation formula of the step S11 is: ; Wherein, P t is the transmitting power, G r is the receiving gain, is the transmitting calibration loop output power under the reference environmental condition, is the receiving calibration loop output power under the reference environmental condition, is the reference calibration loop output power under the reference environmental condition, is a constant, and a is a parameter value under the reference environmental condition, which is used as a reference reference.

[0031] Further, the calculation formula of the step S11 is, ; Wherein, P t is the transmitting power, G r is the receiving gain, is the transmitting calibration loop output power under the varying environmental condition, is the receiving calibration loop output power under the varying environmental condition, The reference calibration loop outputs power under varying environmental conditions, , and are the power parameter variation amounts of the respective calibration loops; is a constant, and b is the measured parameter value under varying environmental conditions, used to represent the corresponding gain state.

[0032] Further, the calculation formula of step S13 is, wherein, ; k is an internal calibration coefficient, , and are the power parameter variation amounts of the respective calibration loops, is the actual value of the product of the transmit power Pt and the receive gain Gr combination.

[0033] Specifically, due to temperature variation, the values of in the equation all change. As shown in FIG. 2, assume that the parameters without change are represented by subscript "a", and the parameters with change are represented by subscript "b": Figure 2 ; ; ; Taking the logarithm of the above formula, we obtain: wherein, k is an internal calibration coefficient.

[0034] Therefore, when the two values of the internal calibration coefficient k and are determined, the variation of gain can be determined. In the ground simulation test phase, the values of can be measured by the equipment, and thus the values of the internal calibration coefficient k varying with temperature are obtained and recorded and summarized, so that in the on-board internal calibration, the values of the internal calibration coefficient k at different temperatures and the values of at the corresponding temperatures are used to calculate at different temperatures, so as to realize compensation of . As described above, the purpose of the ground vacuum calibration test is to obtain the internal calibration coefficient k: ; wherein, .

[0035] Further, in step S2, the transmitting port is connected with the transmitting unit of the device under test, and outputs a multi-channel radio frequency excitation signal through a power division network; the receiving port 1 is used for receiving a scaling loop power parameter, including: The device under test frequency modulation signal source sends a radio frequency excitation signal, which passes through a pre-amplifier, a circulator, a power division network, a TR component, a scaling synthesis network, an internal scaling device and an analog receiver, and the transmitting scaling loop output power is measured by the system receiving port 1; The device under test frequency modulation signal source sends a radio frequency excitation signal, which passes through an internal scaling device, a scaling synthesis network, a TR component, a power division network, a circulator and an analog receiver, and the receiving scaling loop output power is measured by the receiving port 1; The device under test frequency modulation signal source sends a radio frequency excitation signal, which passes through an internal scaling device and an analog receiver, and the reference scaling loop output power is measured by the receiving port 1.

[0036] Further, in step S3, The device under test frequency modulation signal source sends a radio frequency excitation signal, which passes through a pre-amplifier, a circulator and a power division network, and the transmitting power is measured by the receiving port 2.

[0037] The transmitting port 1 transmits a signal from the excitation source through a directional coupler, a TR component of the device under test, a scaling synthesis network and an analog receiver, and the receiving gain is measured by the receiving port 1.

[0038] Second embodiment Based on the same inventive concept, the present application provides a ground vacuum calibration test system based on a multi-channel transceiver module, which performs the ground vacuum calibration test method as described above, and includes, The configuration module is used for determining scaling loop power parameters and link gain parameters based on an internal scaling loop gain formula in a test preparation stage, and establishing a relationship model between each parameter and an internal scaling coefficient k; the scaling loop power parameters include transmitting scaling loop output power P1, receiving scaling loop output power P2 and reference scaling loop output power P3, and the link gain parameters include transmitting power P t And receiving gain G r； The multi-channel transceiver module includes two receiving ports and one transmitting port; the transmitting port is connected with the transmitting unit of the device under test, and outputs a multi-channel radio frequency excitation signal through a power division network; the receiving port 1 is used for receiving scaling loop power parameters and receiving gain Gr, and the receiving port 2 is used for receiving transmitting power Pt output by the device under test; The data processing module is used for starting the test in the ground vacuum environment, the transmitting port transmits the radio frequency excitation signal, the multi-channel transceiver module collects the scaling loop power parameters and the link gain parameters output by the measured equipment in real time, and the environmental conditions during the test are recorded synchronously, including temperature, vacuum degree; based on the scaling loop power parameters collected in step S3, the internal scaling coefficient k is calculated according to the relationship model in step S1, and the corresponding link gain parameters in the on-orbit operation of the satellite are calculated.

[0039] Further, the data processing module comprises, The reference gain calculation unit calculates the product reference value of the transmitting power Pt and the receiving gain Gr based on the scaling loop power parameters and the internal scaling loop gain formula under the reference environmental conditions. The actual gain calculation unit calculates the product actual value of the transmitting power Pt and the receiving gain Gr based on the scaling loop power parameters, the scaling loop power parameter variation and the internal scaling loop gain formula under the varying environmental conditions. The internal scaling coefficient calculation unit calculates the product variation of the transmitting power Pt and the receiving gain Gr based on the product reference value and the product actual value, and calculates the internal scaling coefficient k in combination with the scaling loop power parameter variation.

[0040] The protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solution belonging to the idea of the present application falls within the protection scope of the present application. It should be pointed out that, for ordinary technical personnel in the technical field, some improvements and refinements without departing from the principle of the present application are also regarded as the protection scope of the present application.

[0041] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that the present application is recorded in the range.

[0042] It should be pointed out that the above-mentioned embodiments can be freely combined according to the needs. The above-mentioned is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary technical personnel in the technical field, some improvements and refinements without departing from the principle of the present application are also regarded as the protection scope of the present application.

Claims

1. A ground-based vacuum calibration test method based on a multi-channel transceiver module, characterized in that, The steps include, Step S1: In the test preparation phase, the calibration loop power parameters and link gain parameters are determined based on the internal calibration loop gain formula, and a relationship model between each parameter and the internal calibration coefficient k is established. The calibration loop power parameters include the output power P1 of the transmit calibration loop, the output power P2 of the receive calibration loop, and the output power P3 of the reference calibration loop. The link gain parameters include the transmit power P... t and receive gain G r ; Step S2: Configure a multi-channel transceiver module, including two receiving ports and one transmitting port; the transmitting port is connected to the transmitting unit of the device under test, and outputs multi-channel RF excitation signals after passing through a power divider network; receiving port 1 is used to receive the power parameters of the calibration circuit and the receiving gain Gr, and receiving port 2 is used to receive the transmitting power Pt output by the device under test; Step S3: Start the test in a vacuum environment on the ground. The transmitting port transmits the radio frequency excitation signal. The multi-channel transceiver module collects the calibration loop power parameters and link gain parameters output by the device under test in real time, and records the environmental conditions during the test, including temperature and vacuum level. Step S4: Based on the calibration loop power parameters collected in step S3, calculate the internal calibration coefficient k according to the relationship model in step S1, and calculate the link gain parameters corresponding to the on-orbit operation of the satellite.

2. The ground vacuum calibration test method according to claim 1, characterized in that, Step S1 includes, Step S11: Under reference environmental conditions, based on the calibration circuit power parameters and the inner calibration circuit gain formula, calculate the reference value of the product of the transmit power Pt and the receive gain Gr; Step S12: Under changing environmental conditions, based on the calibration circuit power parameters, the change in calibration circuit power parameters, and the inner calibration circuit gain formula, calculate the actual value of the product of the transmit power Pt and the receive gain Gr. Step S13: Based on the product reference value and the product actual value, calculate the change in the product of the transmit power Pt and the receive gain Gr, and combine it with the change in the power parameters of the calibration loop to calculate the internal calibration coefficient k.

3. The ground vacuum calibration test method according to claim 2, characterized in that, The calculation formula for step S11 is: ； Among them, P t For the aforementioned transmission power, G r The receiving gain is... The output power of the transmit calibration circuit under the aforementioned reference environmental conditions. The output power of the receiving calibration circuit under the aforementioned reference environmental conditions. The reference calibration circuit output power under the aforementioned baseline environmental conditions. is a constant, and a is a parameter value under the reference environmental conditions, used as a reference benchmark.

4. The ground vacuum calibration test method according to claim 3, characterized in that, The calculation formula for step S11 is as follows: ； Wherein, P t For the aforementioned transmission power, G r The receiving gain is... The output power of the transmit calibration circuit under the aforementioned changing environmental conditions. The output power of the receiving calibration circuit under the aforementioned changing environmental conditions. The output power of the reference calibration circuit under the aforementioned changing environmental conditions. , and The variation in power parameters of each calibration circuit; is a constant, and b is a parameter value measured under the changing environmental conditions, used to characterize the corresponding gain state.

5. The ground vacuum calibration test method according to claim 4, characterized in that, The calculation formula for step S13 is as follows: ,in, ; k is the internal scaling coefficient. , and The variation in power parameters of each calibration circuit is given. The actual value is the product of the transmit power Pt and the receive gain Gr.

6. The ground vacuum calibration test method according to claim 1, characterized in that, In step S2, the transmitting port is connected to the transmitting unit of the device under test, and outputs a multi-channel radio frequency excitation signal after passing through a power divider network; the receiving port 1 is used to receive the power parameters of the calibration circuit, including: The frequency modulation signal source of the device under test emits the radio frequency excitation signal, which passes through the pre-power amplifier, circulator, power divider network, TR component, calibration synthesis network, internal calibrator, and analog receiver. The output power of the transmit calibration loop is measured by the system receiving port 1. The frequency modulation signal source of the device under test emits the radio frequency excitation signal, which passes through the internal calibrator, the calibration synthesis network, the TR component, the power divider network, the circulator, and the analog receiver. The power of the received calibration loop output is measured by the receiving port 1. The frequency modulation signal source of the device under test emits the radio frequency excitation signal, which passes through the internal calibrator and the analog receiver. The output power of the reference calibration circuit is measured by the receiving port 1.

7. The ground vacuum calibration test method according to claim 6, characterized in that, In step S3, The frequency modulation signal source of the device under test emits the radio frequency excitation signal, which passes through the pre-power amplifier, the circulator, the power divider network, and the TR component, and the transmit power is measured by the receiving port 2. The signal is transmitted from the excitation source via the directional coupler through the TR component, the calibration synthesis network, and the analog receiver of the device under test. The receiving gain is then measured at the receiving port 1.

8. A ground vacuum calibration test system based on a multi-channel transceiver module, performing the ground vacuum calibration test method as described in any one of claims 1 to 7, characterized in that, include, The configuration module is used during the test preparation phase to determine the calibration loop power parameters and link gain parameters based on the internal calibration loop gain formula, and to establish a relationship model between each parameter and the internal calibration coefficient k. The calibration loop power parameters include the output power P1 of the transmit calibration loop, the output power P2 of the receive calibration loop, and the output power P3 of the reference calibration loop. The link gain parameters include the transmit power P... t and receive gain G r； The multi-channel transceiver module includes two receiving ports and one transmitting port; the transmitting port is connected to the transmitting unit of the device under test and outputs multi-channel radio frequency excitation signals after passing through a power divider network; receiving port 1 is used to receive the power parameters of the calibration circuit and the receiving gain Gr, and receiving port 2 is used to receive the transmitting power Pt output by the device under test; The data processing module is used to initiate the test in a vacuum environment on the ground. The transmitting port transmits the radio frequency excitation signal, and the multi-channel transceiver module collects the calibration loop power parameters and link gain parameters output by the device under test in real time, and records the environmental conditions during the test, including temperature and vacuum level. Based on the calibration loop power parameters collected in step S3, the internal calibration coefficient k is calculated according to the relationship model in step S1, and the corresponding link gain parameters during the on-orbit operation of the satellite are calculated.

9. The ground vacuum calibration test system according to claim 8, wherein the data processing module comprises, The reference gain calculation unit, under reference environmental conditions, calculates the reference value of the product of the transmit power Pt and the receive gain Gr based on the calibration circuit power parameters and the inner calibration circuit gain formula; The actual gain calculation unit calculates the actual value of the product of the transmit power Pt and the receive gain Gr under changing environmental conditions, based on the calibration circuit power parameters, the change in calibration circuit power parameters, and the inner calibration circuit gain formula. The internal calibration coefficient calculation unit calculates the change in the product of the transmit power Pt and the receive gain Gr based on the product reference value and the actual product value, and calculates the internal calibration coefficient k in combination with the change in the power parameters of the calibration loop.

Images