Reflection channel gain calibration method and device, equipment and medium

Abstract

The embodiment of the invention provides a reflection channel gain calibration method and device, equipment and a medium, and the method comprises the steps: obtaining a gain deviation value of an occultation receiver when a preset simulator is under a preset connection condition, and the gain deviation value is a deviation caused by an AD actual sampling value; obtaining a target signal power value input into a reflection channel of the occultation receiver by the preset simulator; receiving the DDM noise power output by the reflection channel; and determining a target gain of the occultation receiver under an AD target sampling value based on the gain deviation value, the target signal power value and the DDM noise power. According to the embodiment of the invention, the gain of the reflection channel is calibrated.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a method, device, equipment and medium for calibrating a reflection channel gain. Background Art

[0002] GNSS-R (Global Navigation Satellite System - Reflectometry) is an instrument that uses the Global Navigation Satellite System (GNSS) signals to detect the Earth's atmosphere and ocean environment. It receives GNSS satellite signals reflected by the Earth's atmosphere or ocean surface to invert relevant physical parameters of the atmosphere and ocean.

[0003] Using GNSS reflected signals to measure sea surface wind fields is one of the main tasks and functions of the GNSS-R occultation detector. This function requires the pre-launch calibration of the GNSS-R occultation detector reflection channel gain to calculate the absolute power of the reflected signal corresponding to the onboard GNSS-R DDM (Delay-Doppler Mapping) waveform.

[0004] For sea surface wind field measurement, accurate reflection channel gain calibration is crucial. When using GNSS-R signals to measure sea surface wind fields, it is necessary to accurately know the absolute power of the reflected signal. The reflected signal power is closely related to the roughness of the sea surface, which in turn is affected by the sea surface wind field. By calculating the absolute power of the reflected signal and noise, the information of the sea surface wind field can be more accurately inverted. If the gain calibration is inaccurate, it will lead to an incorrect estimation of the reflected signal power, which will in turn cause large errors in the wind field inversion process. Summary of the invention

[0005] In view of the above problems, a method and apparatus, device, and storage medium for calibrating the gain of a reflection channel are proposed to overcome the above problems or at least partially solve the above problems, including: A method for calibrating a reflection channel gain, the method comprising: When the preset simulator is under the preset connection condition, a gain deviation value of the occultation receiver is obtained, wherein the gain deviation value is a deviation caused by an actual AD sampling value; Obtaining a target signal power value in a reflection channel inputted from the preset simulator to the occultation receiver; receiving the DDM noise power output by the reflection channel; Based on the gain deviation value, the target signal power value and the DDM noise power, a target gain of the occultation receiver under an AD target sampling value is determined.

[0006] Optionally, when the preset simulator is under a preset connection condition, obtaining a gain deviation value of the occultation receiver includes: When the preset simulator is under the preset connection condition, the gain deviation value of the occultation receiver is determined by adjusting the signal source output power of the preset simulator.

[0007] Optionally, when the preset simulator is under a preset connection condition, determining the gain deviation value of the occultation receiver by adjusting the signal source output power of the preset simulator comprises: Adjusting the signal source output power of the preset simulator, determining the first signal source output power when the AD actual sampling value is the preset value, and determining the second signal source output power when the AD target sampling value is the preset value; A gain deviation value of the occultation receiver is determined based on the first signal source output power and the second signal source output power.

[0008] Optionally, determining a gain deviation value of an occultation receiver based on the output power of the first signal source and the output power of the second signal source includes: The difference between the output power of the first signal source and the output power of the second signal source is used as the gain deviation value of the occultation receiver.

[0009] Optionally, the obtaining of the target signal power value in the reflection channel input by the preset simulator to the occultation receiver comprises: When the preset simulator inputs a simulator signal to the reflection channel of the occultation receiver, a power meter connected to the preset simulator is used to collect a candidate signal power value at each power point; A target signal power value is determined according to the candidate signal power values.

[0010] Optionally, determining a target gain of the occultation receiver at an AD target sampling value based on the gain deviation value, the target signal power value, and the DDM noise power includes: Determining a quotient of the DDM noise power and the target signal power value; The target gain of the occultation receiver at the AD target sampling value is determined based on the difference between the quotient value and the gain deviation value.

[0011] Optionally, it also includes: Error correction is performed on the occultation receiver based on the target gain.

[0012] A device for calibrating a reflection channel gain, the device comprising: A gain deviation value acquisition module is used to acquire a gain deviation value of the occultation receiver when the preset simulator is under a preset connection condition, wherein the gain deviation value is a deviation caused by an actual AD sampling value; A target signal power value acquisition module, used to acquire the target signal power value in the reflection channel input from the preset simulator to the occultation receiver; A DDM noise power receiving module, used for receiving the DDM noise power output by the reflection channel; The target gain determination module is used to determine the target gain of the occultation receiver under the AD target sampling value based on the gain deviation value, the target signal power value and the DDM noise power.

[0013] An electronic device comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein the computer program implements the above-mentioned calibration method for reflection channel gain when executed by the processor.

[0014] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the calibration method of the reflection channel gain as described above is implemented.

[0015] The embodiments of the present invention have the following advantages: In an embodiment of the present invention, when the preset simulator is under preset connection conditions, the gain deviation value of the occultation receiver is obtained, and the gain deviation value is the deviation caused by the actual AD sampling value; the target signal power value in the reflection channel input by the preset simulator to the occultation receiver is obtained; the DDM noise power output by the reflection channel is received; based on the gain deviation value, the target signal power value and the DDM noise power, the target gain of the occultation receiver under the AD target sampling value is determined, thereby achieving calibration of the reflection channel gain, providing a new error correction method, and further improving the data inversion accuracy. Using a simulator signal source with known signal strength, high-precision calibration of the system is achieved by precisely controlling the ambient temperature and digital control AGC. The system is corrected for gain calibration errors before launch, and the correction results are applied to on-orbit data inversion, further improving the inversion accuracy of on-orbit applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0017] Figure 1is a flow chart of steps of a method for calibrating a reflection channel gain provided by an embodiment of the present invention; Figure 2a is a flowchart of another method for calibrating the reflection channel gain provided by an embodiment of the present invention; Figure 2b It is a block diagram of the principle of calibration of gain deviation value caused by sampling value change provided by one embodiment of the present invention; Figure 3 is a flowchart of another method for calibrating the reflection channel gain provided by an embodiment of the present invention; Figure 4a is a flowchart of another method for calibrating the reflection channel gain provided by an embodiment of the present invention; Figure 4b It is a block diagram of the principle of power calibration of a simulator output signal provided by an embodiment of the present invention; Figure 5a This is a schematic diagram of a reflective channel calibration system provided by one embodiment of the present invention; Figure 5b Another embodiment of the present invention provides a reflection channel calibration system block diagram; Figure 5c It is a general test principle block diagram of a reflection channel calibration system provided by an embodiment of the present invention; Figure 6 It is a structural schematic diagram of a calibration device for reflection channel gain provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Reference Figure 1 , shows a flow chart of the steps of a method for calibrating the reflection channel gain provided by an embodiment of the present invention, which may specifically include the following steps: Step S101, when the preset simulator is under the preset connection condition, obtaining the gain deviation value of the occultation receiver, the gain deviation value being the deviation caused by the actual AD sampling value; In practical applications, the preset simulator can be used to generate simulated signals to input the simulated signals into the occultation receiver. The occultation receiver receives signals from low earth orbit (LEO) satellites and global navigation satellite system (GNSS) satellites, measures the refraction and delay of the signals when passing through the earth's atmosphere, and thus inverts atmospheric parameters (such as temperature, pressure, humidity) and ionospheric electron density.

[0020] Under the simulator connection conditions, the actual sampling value of the AD (analog-to-digital converter) may introduce a deviation value of the receiver gain. This phenomenon is usually related to hardware characteristics, nonlinearity of the signal processing link, and interface matching between the simulator and the receiver. Among them, the simulator connection conditions refer to the connection method and parameter settings between the simulator and the receiver in the test or simulation environment. These conditions directly affect the signal transmission quality and the performance of the receiver.

[0021] In the embodiment of the present invention, when the preset simulator is under the preset connection condition, the gain deviation value of the occultation receiver can be calibrated. The gain deviation value is the deviation caused by the actual AD sampling value and is a known quantity.

[0022] Step S102, obtaining a target signal power value in a reflection channel inputted from a preset simulator to an occultation receiver; The preset simulator can generate a simulation signal and input the generated simulation signal into the reflection channel of the occultation receiver to simulate the on-orbit state of the occultation receiver. In an embodiment of the present invention, the target signal power value of the simulation signal can be calibrated in advance. After the calibration is completed, the target signal power value is known data, and the reflection channel gain calibration can be implemented based on the target signal power value.

[0023] Step S103, receiving the DDM noise power output by the reflection channel; After the analog signal is input into the reflection channel, it is processed by the reflection channel and the DDM noise power output by the reflection channel can be received.

[0024] Step S104, determining the target gain of the occultation receiver under the AD target sampling value based on the gain deviation value, the target signal power value and the DDM noise power.

[0025] After obtaining the gain deviation value, the target signal power value and the DDM noise power, the target gain of the occultation receiver under the AD target sampling value can be determined by combining the relationship between the gain deviation value, the target signal power value and the DDM noise power and the target gain of the occultation receiver under the AD target sampling value. Among them, in the relationship between the gain deviation value, the target signal power value, the DDM noise power and the target gain of the occultation receiver under the AD target sampling value, the gain deviation value, the target signal power value and the DDM noise power are all known data, and only the target gain is an unknown data, so a set of gain deviation values, target signal power values ​​and DDM noise power can calculate the target gain of the occultation receiver under the AD target sampling value.

[0026] The target sampling value may be a value set according to the scenario, such as AD13.5.

[0027] In one embodiment of the present invention, the specific process of step S104 is: determining the quotient of the DDM noise power and the target signal power value; and determining the target gain of the occultation receiver under the AD target sampling value based on the difference between the quotient and the gain deviation value.

[0028] Target gain = DDM noise power / target signal power value - gain deviation value.

[0029] In one embodiment of the present invention, after determining the target gain, the error of the occultation receiver can be corrected based on the target gain, so that the correction result can be applied to the inversion of on-orbit data, further improving the inversion accuracy of the on-orbit application.

[0030] In an embodiment of the present invention, when a preset simulator is under preset connection conditions, a gain deviation value of the occultation receiver is obtained, wherein the gain deviation value is a deviation caused by an actual AD sampling value; a target signal power value in a reflection channel input from the preset simulator to the occultation receiver is obtained; the DDM noise power output from the reflection channel is received; and based on the gain deviation value, the target signal power value, and the DDM noise power, the target gain of the occultation receiver under the AD target sampling value is determined. Through the embodiment of the present invention, the reflection channel gain is calibrated, and a new error correction method is provided to further improve the data inversion accuracy. By using a simulator signal source with known signal strength, high-precision calibration of the system is achieved by precisely controlling the ambient temperature and the numerically controlled AGC. The system is subjected to gain calibration error correction before launch, and the correction result is applied to the inversion of on-orbit data, further improving the inversion accuracy of on-orbit applications.

[0031] Reference Figure 2a , shows a flowchart of another method for calibrating the reflection channel gain provided by an embodiment of the present invention, which may specifically include the following steps: Step S201, when the preset simulator is under the preset connection condition, obtaining a gain deviation value of the occultation receiver, the gain deviation value being a deviation caused by an actual AD sampling value; Step S202, when the preset simulator is under the preset connection condition, determining the gain deviation value of the occultation receiver by adjusting the signal source output power of the preset simulator; In practical applications, the signal source of the preset simulator can output a signal whose signal source output power is known. Then, through AD sampling, the AD sampling value corresponding to the current signal source output power can be determined, and the AD sampling value can be converted into an AD target value.

[0032] Based on the above data processing process, when the signal source output power is adjusted, the AD sampling value and the AD target value change accordingly, and the gain deviation value is the deviation caused by the actual AD sampling value. Therefore, the gain deviation value of the occultation receiver can be determined by adjusting the signal source output power of the preset simulator.

[0033] In one embodiment of the present invention, when the preset simulator is under the preset connection condition, determining the gain deviation value of the occultation receiver by adjusting the signal source output power of the preset simulator may include the following sub-steps: Sub-step S11, adjusting the signal source output power of the preset simulator, determining the first signal source output power when the AD actual sampling value is the preset value, and determining the second signal source output power when the AD target sampling value is the preset value; In actual applications, when adjusting the signal source output power of the preset simulator, the AD actual sampling value and the AD target sampling value will change accordingly. Therefore, the preset value can be set in advance. Then, in the process of adjusting the signal source output power, the first signal source output power can be determined when the AD actual sampling value is the preset value, and the second signal source output power can be determined when the AD target sampling value is the preset value, wherein the preset value is set according to the actual scenario.

[0034] Sub-step S12, determining a gain deviation value of the occultation receiver based on the output power of the first signal source and the output power of the second signal source.

[0035] After the output power of the first signal source and the output power of the second signal source are obtained, the gain deviation value of the occultation receiver can be determined according to the output power of the first signal source and the output power of the second signal source.

[0036] Specifically, the difference between the output power of the first signal source and the output power of the second signal source is used as the gain deviation value of the occultation receiver.

[0037] That is, the gain deviation value = the output power of the first signal source - the output power of the second signal source.

[0038] Step S203, receiving the DDM noise power output by the reflection channel; Step S204, determining the target gain of the occultation receiver under the AD target sampling value based on the gain deviation value, the target signal power value and the DDM noise power.

[0039] Reference Figure 2b , is a principle block diagram of a gain deviation value calibration caused by a sampling value change in an embodiment of the present invention, the simulator includes a signal source, a reflection channel baseband part, a debug box, MOXA, and a PC serial port display terminal. Among them, the reflection channel baseband part can include AD and FPGA.

[0040] Among them, the output power of the signal source is a known quantity. By accurately adjusting the output power of the signal, the signal power range of point B is ensured to be -4dBm~-6dBm. Then, the insertion loss of the RF coaxial cable can be calibrated using a spectrum analyzer, so that the output signal of the signal source enters the AD to achieve AD sampling. Then, the FPGA processes the AD sampling value, converts the sampling value into the target value through simple calculation, and then enters the Debug box through the debug cable. After the Debug box debugs the data, it enters the MOXA box through the serial port debug cable. The MOXA box converts the 422 data into serial port data, and then enters the PC through the USB cable for serial port display.

[0041] By accurately adjusting the output signal power intensity of the signal source, the output power P13.5 of the signal source can be obtained when the system sampling target value is 13.5. Then, the output power P△ of the signal source corresponding to different target values ​​can be obtained by adjusting the output power of the signal source. When the sampling target value is adjusted to be the same as the target value of the system connection simulator, =P 13.5 -P △ .

[0042] In an embodiment of the present invention, when the preset simulator is under the preset connection condition, the gain deviation value of the occultation receiver is determined by adjusting the signal source output power of the preset simulator; the target signal power value in the reflection channel input from the preset simulator to the occultation receiver is obtained; the DDM noise power output by the reflection channel is received; based on the gain deviation value, the target signal power value and the DDM noise power, the target gain of the occultation receiver under the AD target sampling value is determined, thereby realizing the calibration of the reflection channel gain.

[0043] Reference Figure 3 , shows a flow chart of the steps of a method for calibrating the reflection channel gain provided by an embodiment of the present invention, which may specifically include the following steps: Step S301, when the preset simulator is under the preset connection condition, obtaining the gain deviation value of the occultation receiver, the gain deviation value being the deviation caused by the actual AD sampling value; Step S302, obtaining a target signal power value in a reflection channel inputted from a preset simulator to an occultation receiver; Step S303, receiving the DDM noise power output by the reflection channel; Step S304, determining a quotient of the DDM noise power and the target signal power value; In practical applications, the relationship between DDM noise power, target signal power value, gain deviation value, and target gain is as follows: DDM noise power = (target gain + gain deviation value) * target signal power value.

[0044] Based on the above relationship, after obtaining the DDM noise power, the target signal power value and the gain deviation value, the quotient of the DDM noise power and the target signal power value can be determined first, and then the target gain can be calculated based on the quotient.

[0045] Step S305: determining the target gain of the occultation receiver under the AD target sampling value based on the difference between the quotient value and the gain deviation value.

[0046] The formula for calculating the total gain of the reflection channel using the simulator signal is as follows:

[0047] In the formula, Output DDM signal related power value, The ideal gain of the receiver when the AD target value is 13.5 under the ambient temperature T condition; is the deviation value of the receiver gain caused by the actual AD sampling value under the simulator connection condition, which can be obtained through calibration and is a known quantity; is the signal power value input into the reflection link, which can be obtained through calibration and adjusted to a known value.

[0048] Since there is only one unknown quantity in the formula Therefore, the total gain of the receiver can be calibrated through a set of observations. Then, the calibration result of the total gain of the receiver reflection channel is corrected using the measured value.

[0049] In an embodiment of the present invention, when a preset simulator is under a preset connection condition, a gain deviation value of the occultation receiver is obtained, the gain deviation value being a deviation caused by an actual AD sampling value; a target signal power value in a reflection channel input from the preset simulator to the occultation receiver is obtained; a DDM noise power output from the reflection channel is received; a quotient of the DDM noise power and the target signal power value is determined; and a target gain of the occultation receiver under an AD target sampling value is determined based on a difference between the quotient and the gain deviation value, thereby achieving calibration of the reflection channel gain, providing a new error correction method, and further improving data inversion accuracy.

[0050] Reference Figure 4a , shows a flowchart of another method for calibrating the reflection channel gain provided by an embodiment of the present invention, which may specifically include the following steps: Step S401, when the preset simulator is under the preset connection condition, obtaining the gain deviation value of the occultation receiver, the gain deviation value being the deviation caused by the actual AD sampling value; Step S402, when the preset simulator inputs a simulator signal to the reflection channel of the occultation receiver, a power meter connected to the preset simulator is used to collect a candidate signal power value at each power point; In practical applications, the preset simulator can be connected to a power meter, which can be used to accurately measure the collected signal power to further improve the calibration accuracy. The sampling frequency and sampling period of the power meter can be set in advance, and then the candidate signal power values ​​of the power points can be collected according to the sampling frequency and sampling period to calculate the target signal power value.

[0051] Step S403: determining a target signal power value according to the candidate signal power values.

[0052] After collecting multiple candidate signal power points, a target signal power value may be determined based on the multiple candidate signal power points. Specifically, an average value of the multiple candidate signal power points may be used as the target signal power value.

[0053] Step S404, receiving the DDM noise power output by the reflection channel; Step S405, determining the target gain of the occultation receiver under the AD target sampling value based on the gain deviation value, the target signal power value and the DDM noise power.

[0054] Reference Figure 4b , shows a block diagram of the power calibration principle of a simulator output signal provided by an embodiment of the present invention, wherein the simulator is connected to a power meter and an industrial computer, and a data recording PC is connected to the power meter.

[0055] The output power of the simulator can be set and adjusted through an industrial computer, but it is considered an unknown quantity. The output port of the simulator is connected to a power meter through an RF coaxial cable. The power meter accurately measures the collected signal power. To further improve the calibration accuracy, the data sampled by the power meter is transmitted to a data recording PC for statistics and averaging. The statistical accuracy can reach 0.01dB.

[0056] The industrial computer sets the output power of the simulator. According to the actual working environment, the setting range is -115dBm to -145dBm, the step is 1dB, and each power point stays for 5 minutes. The 31 power points are accurately calibrated by the power meter and the data recording PC. Then, the output power of the simulator can be accurately calculated by considering the insertion loss of the RF coaxial cable. .

[0057] In an embodiment of the present invention, when a preset simulator is under a preset connection condition, a gain deviation value of the occultation receiver is obtained, and the gain deviation value is a deviation caused by an actual AD sampling value; when the preset simulator inputs a simulator signal to a reflection channel of the occultation receiver, a power meter connected to the preset simulator is used to collect a candidate signal power value at each power point; a target signal power value is determined according to the candidate signal power value; the DDM noise power output by the reflection channel is received; based on the gain deviation value, the target signal power value and the DDM noise power, the target gain of the occultation receiver under the AD target sampling value is determined, thereby realizing calibration of the reflection channel gain, providing a new error correction method, and further improving data inversion accuracy.

[0058] Reference Figure 5a , which is a principle block diagram of a reflection channel calibration system implemented in the present invention. The reflection channel calibration system may include a reflection antenna, an LNA (low noise amplifier) ​​and a filter, a down-conversion channel and a baseband processing. The reflection antenna may be used to receive a GNSS reflection signal, and the input power is Pin. The LNA and the filter are used to amplify the reflection signal received by the reflection antenna and filter out the out-of-band interference signal. The down-conversion channel is used to down-convert, amplify the intermediate frequency, filter the intermediate frequency and perform AD sampling on the amplified and filtered signal. The baseband processing is used to capture, track and resolve the sampled digital intermediate frequency signal, and then output the DDM related power value (that is, the DDM noise observation value of the input calibration source).

[0059] refer to Figure 5b , which is a principle block diagram of another reflection channel calibration system implemented in the present invention. The reflection channel detailed design circuit may include a reflection antenna, a cavity filter, a first-stage LNA, a RF filter, a second-stage LNA, a down-conversion, an intermediate frequency amplifier, an intermediate frequency filter, an AD, a baseband FPGA and a reflection DSP.

[0060] The reflection antenna can be used to receive the GNSS reflection signal, and then transmit the signal to the cavity filter. The cavity filter filters the received reflection signal and removes out-of-band interference. The first-stage LNA performs low-noise amplification on the filtered signal, and then transmits the signal to the RF filter. The RF filter can be used to suppress image interference, and then the signal enters the second-stage LNA for further amplification. The amplified signal enters the down-conversion module. The constant temperature crystal oscillator provides the system clock input to the phase-locked local oscillator source, and then outputs the local oscillator signal to provide the local oscillator signal for down-conversion. The down-conversion module performs frequency migration on the signal, down-converts the RF signal to an intermediate frequency signal, and then enters the intermediate frequency amplifier for intermediate frequency amplification. The intermediate frequency amplified signal enters the intermediate frequency filter for intermediate frequency filtering. The intermediate frequency filtered signal enters the AD for analog-to-digital conversion. The converted intermediate frequency digital signal enters the baseband FPGA for digital signal capture and tracking. The processed signal enters the reflection DSP for data inversion and solution, and outputs the DDM related power value (that is, the DDM noise observation value of the input calibration source).

[0061] refer to Figure 5c , which is another overall experimental principle block diagram of the reflection channel calibration system implemented by the present invention. In this experiment, a simulator is used as an input signal source of known power. Under the condition of an incubator controlled at an ambient temperature of 0℃ to 45℃, the DDM signal of the detector reflection channel is collected under different input signal power conditions. Finally, the total link gain of the receiver is calculated through post-data processing, and a calibration error correction model and an AD sampling error correction model are established, and a lookup table and correction model required for calculating the input signal power from the DDM digital observation quantity are established.

[0062] The occultation detector host is placed inside the high and low temperature box, and the ground equipment is placed outside the high and low temperature box. The GNSS signal simulator generates GNSS satellites. The simulator's rear port signal is connected to the occultation detector's positioning and occultation channels through a radio frequency power divider. The simulator's calibrated front port signal is connected to the occultation detector's reflection channel through a radio frequency cable. The linear regulated power supply provides +28V system power for the occultation detector host. The occultation detector host is connected to the ground inspection equipment through an interface module. The interface module transmits low-speed 422 data, high-speed 422 data, and 1553B data to the ground inspection equipment, and then transmits it to the data receiving PC through the USB bus for display and post-data processing. The analog signal acquisition is measured using a multimeter.

[0063] It should be noted that, for the sake of simplicity, the method embodiments are described as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0064] Reference Figure 6 , shows a schematic diagram of the structure of a calibration device for a reflection channel gain provided by an embodiment of the present invention, which may specifically include the following modules: A gain deviation value acquisition module 601 is used to acquire a gain deviation value of the occultation receiver when the preset simulator is under a preset connection condition, wherein the gain deviation value is a deviation caused by an actual AD sampling value; A target signal power value acquisition module 602 is used to acquire a target signal power value in a reflection channel inputted from the preset simulator to the occultation receiver; A DDM noise power receiving module 603, used to receive the DDM noise power output by the reflection channel; The target gain determination module 604 is used to determine the target gain of the occultation receiver under the AD target sampling value based on the gain deviation value, the target signal power value and the DDM noise power.

[0065] In an embodiment of the present invention, the gain deviation value acquisition module 601 may include the following sub-steps: The gain deviation value determination submodule is used to determine the gain deviation value of the occultation receiver by adjusting the signal source output power of the preset simulator when the preset simulator is under the preset connection condition.

[0066] In one embodiment of the present invention, the gain deviation value determination submodule may include: A signal source output power determination unit, used to adjust the signal source output power of the preset simulator, determine the first signal source output power when the AD actual sampling value is a preset value, and determine the second signal source output power when the AD target sampling value is a preset value; A gain deviation value determining unit is used to determine the gain deviation value of the occultation receiver based on the output power of the first signal source and the output power of the second signal source.

[0067] In one embodiment of the present invention, the gain deviation value determining unit may include: The gain deviation value determining subunit is used to use the difference between the output power of the first signal source and the output power of the second signal source as the gain deviation value of the occultation receiver.

[0068] In an embodiment of the present invention, the target signal power value acquisition module 602 may include the following submodules: A candidate signal power value determination submodule, configured to collect the candidate signal power value of each power point by using a power meter connected to the preset simulator when the preset simulator inputs a simulator signal to the reflection channel of the occultation receiver; The target signal power value determination submodule is used to determine the target signal power value according to the candidate signal power value.

[0069] In an embodiment of the present invention, the target gain determination module 604 may include: A quotient value determination submodule, used to determine a quotient value of the DDM noise power and the target signal power value; The target gain determination submodule is used to determine the target gain of the occultation receiver under the AD target sampling value based on the difference between the quotient value and the gain deviation value.

[0070] In one embodiment of the present invention, the device further comprises: An error correction module is used to perform error correction on the occultation receiver based on the target gain.

[0071] In an embodiment of the present invention, when a preset simulator is under preset connection conditions, a gain deviation value of the occultation receiver is obtained, wherein the gain deviation value is a deviation caused by an actual AD sampling value; a target signal power value in a reflection channel input from the preset simulator to the occultation receiver is obtained; the DDM noise power output from the reflection channel is received; and based on the gain deviation value, the target signal power value, and the DDM noise power, the target gain of the occultation receiver under the AD target sampling value is determined. Through the embodiment of the present invention, the reflection channel gain is calibrated, and a new error correction method is provided to further improve the data inversion accuracy. By using a simulator signal source with known signal strength, high-precision calibration of the system is achieved by precisely controlling the ambient temperature and the numerically controlled AGC. The system is subjected to gain calibration error correction before launch, and the correction result is applied to the inversion of on-orbit data, further improving the inversion accuracy of on-orbit applications.

[0072] An embodiment of the present invention further provides an electronic device, which may include a processor, a memory, and a computer program stored in the memory and capable of running on the processor. When the computer program is executed by the processor, the above-mentioned calibration method for the reflection channel gain is implemented.

[0073] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned method for calibrating the reflection channel gain is implemented.

[0074] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0076] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0077] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0078] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0079] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1The steps for the functions specified in one or more boxes.

[0080] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0081] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0082] The above is a detailed introduction to the provided method, device, equipment and medium for calibrating the reflection channel gain. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for calibrating a reflection channel gain, characterized in that: The method comprises: When the preset simulator is under the preset connection condition, a gain deviation value of the occultation receiver is obtained, wherein the gain deviation value is a deviation caused by an actual AD sampling value; Obtaining a target signal power value in a reflection channel inputted from the preset simulator to the occultation receiver; receiving the DDM noise power output by the reflection channel; Based on the gain deviation value, the target signal power value and the DDM noise power, a target gain of the occultation receiver under an AD target sampling value is determined.

2. The method according to claim 1, characterized in that The step of obtaining a gain deviation value of an occultation receiver when the preset simulator is under a preset connection condition comprises: When the preset simulator is under the preset connection condition, the gain deviation value of the occultation receiver is determined by adjusting the signal source output power of the preset simulator.

3. The method according to claim 2, characterized in that The method of determining a gain deviation value of an occultation receiver by adjusting a signal source output power of the preset simulator when the preset simulator is under a preset connection condition comprises: Adjusting the signal source output power of the preset simulator, determining the first signal source output power when the AD actual sampling value is the preset value, and determining the second signal source output power when the AD target sampling value is the preset value; A gain deviation value of the occultation receiver is determined based on the first signal source output power and the second signal source output power.

4. The method according to claim 3, characterized in that: The step of determining a gain deviation value of an occultation receiver based on the output power of the first signal source and the output power of the second signal source comprises: The difference between the output power of the first signal source and the output power of the second signal source is used as the gain deviation value of the occultation receiver.

5. The method according to claim 1, characterized in that The step of obtaining the target signal power value in the reflection channel inputted by the preset simulator to the occultation receiver comprises: When the preset simulator inputs a simulator signal to the reflection channel of the occultation receiver, a power meter connected to the preset simulator is used to collect a candidate signal power value at each power point; A target signal power value is determined according to the candidate signal power values.

6. The method according to claim 1, characterized in that The step of determining a target gain of the occultation receiver at an AD target sampling value based on the gain deviation value, the target signal power value, and the DDM noise power comprises: Determining a quotient of the DDM noise power and the target signal power value; The target gain of the occultation receiver at the AD target sampling value is determined based on the difference between the quotient value and the gain deviation value.

7. The method according to claim 1, characterized in that Also includes: Error correction is performed on the occultation receiver based on the target gain.

8. A calibration device for reflection channel gain, characterized in that: The device comprises: A gain deviation value acquisition module is used to acquire a gain deviation value of the occultation receiver when the preset simulator is under a preset connection condition, wherein the gain deviation value is a deviation caused by an actual AD sampling value; A target signal power value acquisition module, used to acquire the target signal power value in the reflection channel input from the preset simulator to the occultation receiver; A DDM noise power receiving module, used for receiving the DDM noise power output by the reflection channel; The target gain determination module is used to determine the target gain of the occultation receiver under the AD target sampling value based on the gain deviation value, the target signal power value and the DDM noise power.

9. An electronic device, characterized in that: The invention comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein when the computer program is executed by the processor, the method for calibrating the reflection channel gain as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for calibrating the reflection channel gain according to any one of claims 1 to 7 is implemented.

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