A calibration method and device, equipment, and medium for reflection channel gain

Abstract

An embodiment of the present invention provides a method and apparatus, device, and medium for calibrating the gain of a reflection channel. The method includes: when a preset simulator is under preset connection conditions, obtaining a gain deviation value of a occultation receiver, where the gain deviation value is a deviation caused by an actual AD sampling value; obtaining a target signal power value input by the preset simulator into a reflection channel of the occultation receiver; receiving a DDM noise power output by the reflection channel; and 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. Through the embodiment of the present invention, calibration of the gain of the reflection channel is achieved.

Description

Technical Field

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

[0002] A GNSS-R (Global Navigation Satellite System - Reflectometry) occultation sounder is an instrument that uses 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] Measuring the sea surface wind field using GNSS reflected signals is one of the main tasks and functions of a GNSS-R occultation sounder. This function requires pre-launch calibration of the reflection channel gain of the GNSS-R occultation sounder to calculate the absolute power of the reflected signal corresponding to the on-board GNSS-R DDM (Delay-Doppler Mapping) waveform.

[0004] For sea surface wind field measurement, accurate calibration of the reflection channel gain is crucial. When measuring the sea surface wind field using GNSS-R signals, it is necessary to accurately know the absolute power of the reflected signal. The reflected signal power is closely related to the sea surface roughness, which is in turn 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, and thus a large error will occur in the wind field inversion process. Summary of the Invention

[0005] In view of the above problems, a method and device, equipment, and storage medium for calibrating the gain of a reflection channel are proposed to overcome or at least partially solve the above problems, including:

[0006] A method for calibrating the gain of a reflection channel, the method including:

[0007] When a preset simulator is under preset connection conditions, obtain the gain deviation value of the occultation receiver, where the gain deviation value is the deviation caused by the actual AD sampling value;

[0008] Obtain the target signal power value input by the preset simulator into the reflection channel of the occultation receiver;

[0009] Receive the DDM noise power output by the reflection channel;

[0010] Determine the target gain of the occultation receiver at the AD target sampling value based on the gain deviation value, the target signal power value, and the DDM noise power.

[0011] Optionally, when the preset simulator is under the preset connection condition, obtaining the gain deviation value of the occultation receiver includes:

[0012] When the preset simulator is under the preset connection condition, determine the gain deviation value of the occultation receiver by adjusting the signal source output power of the preset simulator.

[0013] Optionally, 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 includes:

[0014] Adjust the signal source output power of the preset simulator to 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;

[0015] Determine the gain deviation value of the occultation receiver based on the first signal source output power and the second signal source output power.

[0016] Optionally, determining the gain deviation value of the occultation receiver based on the first signal source output power and the second signal source output power includes:

[0017] Take the difference between the first signal source output power and the second signal source output power as the gain deviation value of the occultation receiver.

[0018] Optionally, obtaining the target signal power value input by the preset simulator into the reflection channel of the occultation receiver includes:

[0019] When the preset simulator inputs a simulator signal into the reflection channel of the occultation receiver, use a power meter connected to the preset simulator to collect the candidate signal power values at each power point;

[0020] Determine the target signal power value according to the candidate signal power values.

[0021] Optionally, determining the target gain of the occultation receiver at the AD target sampling value based on the gain deviation value, the target signal power value, and the DDM noise power includes:

[0022] Determine the quotient of the DDM noise power and the target signal power value;

[0023] Determine the target gain of the occultation receiver at the AD target sampling value based on the difference between the quotient value and the gain deviation value.

[0024] Optionally, it further includes:

[0025] Perform error correction on the occultation receiver based on the target gain.

[0026] A calibration device for the reflection channel gain, the device includes:

[0027] A gain deviation value acquisition module, configured to acquire the gain deviation value of the occultation receiver when a preset simulator is under a preset connection condition, where the gain deviation value is the deviation caused by the AD actual sampling value;

[0028] A target signal power value acquisition module, configured to acquire the target signal power value input by the preset simulator into the reflection channel of the occultation receiver;

[0029] A DDM noise power reception module, configured to receive the DDM noise power output by the reflection channel;

[0030] A target gain determination module, configured to determine the target gain of the occultation receiver at the AD target sampling value based on the gain deviation value, the target signal power value, and the DDM noise power.

[0031] An electronic device, including a processor, a memory, and a computer program stored on the memory and capable of running on the processor, where when the computer program is executed by the processor, it implements the calibration method for the reflection channel gain as described above.

[0032] A computer-readable storage medium, on which a computer program is stored, where when the computer program is executed by a processor, it implements the calibration method for the reflection channel gain as described above.

[0033] The embodiments of the present invention have the following advantages:

[0034] In an embodiment of the present invention, when a preset simulator is under preset connection conditions, a gain deviation value of a occultation receiver is obtained, where the gain deviation value is a deviation caused by an actual AD sampling value; a target signal power value input by the preset simulator into a reflection channel of the occultation receiver is obtained; 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, a target gain of the occultation receiver at an AD target sampling value is determined, thereby calibrating the gain of the reflection channel, providing a new error correction method, and further improving the data inversion accuracy. By using a simulator signal source with a known signal strength and precisely controlling the environmental temperature and numerically controlled AGC, high-precision calibration of the system is achieved. The gain calibration error before launch of the system is corrected, and the correction result is applied to the in-orbit data inversion, further improving the inversion accuracy of the in-orbit application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the description of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 is a flowchart of the steps of a method for calibrating the gain of a reflection channel provided by an embodiment of the present invention;

[0037] Figure 2a is a flowchart of the steps of another method for calibrating the gain of a reflection channel provided by an embodiment of the present invention;

[0038] Figure 2b is a principle block diagram for calibrating the gain deviation value caused by the change of sampling value provided by an embodiment of the present invention;

[0039] Figure 3 is a flowchart of the steps of another method for calibrating the gain of a reflection channel provided by an embodiment of the present invention;

[0040] Figure 4a is a flowchart of the steps of another method for calibrating the gain of a reflection channel provided by an embodiment of the present invention;

[0041] Figure 4b is a principle block diagram for calibrating the output signal power of a simulator provided by an embodiment of the present invention;

[0042] Figure 5a is a principle block diagram of a reflection channel calibration system provided by an embodiment of the present invention;

[0043] Figure 5bIt is a schematic block diagram of another reflection channel calibration system provided by an embodiment of the present invention;

[0044] Figure 5c It is a schematic block diagram of the overall test principle of a reflection channel calibration system provided by an embodiment of the present invention;

[0045] Figure 6 It is a schematic structural diagram of a calibration device for the reflection channel gain provided by an embodiment of the present invention. Detailed implementation manners

[0046] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0047] Referring to Figure 1 , a flowchart of the steps of a method for calibrating the reflection channel gain provided by an embodiment of the present invention is shown, which may specifically include the following steps:

[0048] Step S101, when the preset simulator is under the preset connection condition, obtain the gain deviation value of the occultation receiver, where the gain deviation value is the deviation caused by the actual sampling value of the AD;

[0049] In practical applications, the preset simulator can be used to generate a simulated signal, and input the simulated signal into the occultation receiver. The occultation receiver measures the refraction and delay of the signal when passing through the Earth's atmosphere by receiving the signal between a low Earth orbit (LEO) satellite and a global navigation satellite system (GNSS) satellite, so as to invert the atmospheric parameters (such as temperature, pressure, humidity) and the ionospheric electron density.

[0050] Under the simulator connection condition, 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 the hardware characteristics, the nonlinearity of the signal processing link, and the interface matching between the simulator and the receiver. Among them, the simulator connection condition refers 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.

[0051] 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 sampling value of the AD and is a known quantity.

[0052] Step S102, obtain the target signal power value input by the preset simulator into the reflection channel of the occultation receiver;

[0053] The preset simulator can generate analog signals and input the generated analog signals 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 analog signal can be pre-calibrated. After the calibration is completed, the target signal power value is known data, and the reflection channel gain calibration can be achieved based on the target signal power value.

[0054] Step S103: Receive the DDM noise power output by the reflection channel;

[0055] After the analog signal is input into the reflection channel and processed by the reflection channel, the DDM noise power output by the reflection channel can be received.

[0056] Step S104: Determine the target gain of the occultation receiver at the AD target sampling value based on the gain deviation value, the target signal power value, and the DDM noise power.

[0057] After obtaining the gain deviation value, the target signal power value, and the DDM noise power, the target gain of the occultation receiver at the AD target sampling value can be determined by combining the relationship between the gain deviation value, the target signal power value, the DDM noise power, and the target gain of the occultation receiver at 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 at 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. Therefore, a set of gain deviation values, target signal power values, and DDM noise powers can be used to calculate the target gain of the occultation receiver at the AD target sampling value.

[0058] Among them, the target sampling value can be a value set according to the scenario, such as AD13.5.

[0059] In an embodiment of the present invention, the specific process of step S104 is: determine the quotient of the DDM noise power and the target signal power value; determine the target gain of the occultation receiver at the AD target sampling value based on the difference between the quotient and the gain deviation value.

[0060] Target gain = DDM noise power / target signal power value - gain deviation value.

[0061] In an embodiment of the present invention, after determining the target gain, the occultation receiver can also be error-corrected based on the target gain, so that the correction result can be applied to the on-orbit data inversion, further improving the inversion accuracy of the on-orbit application.

[0062] In an embodiment of the present invention, when a preset simulator is under preset connection conditions, a gain deviation value of a occultation receiver is obtained, where the gain deviation value is a deviation caused by an actual AD sampling value; a target signal power value input by the preset simulator into a reflection channel of the occultation receiver is obtained; DDM noise power output by the reflection channel is received; and based on the gain deviation value, the target signal power value, and the DDM noise power, a target gain of the occultation receiver at an AD target sampling value is determined. Through the embodiment of the present invention, calibration of the gain of the reflection channel is achieved, a new error correction method is provided, and the data inversion accuracy is further improved. By using a simulator signal source with a known signal intensity and precisely controlling the ambient temperature and numerically controlled AGC, high-precision calibration of the system is realized. The pre-launch gain calibration error of the system is corrected, and the correction result is applied to on-orbit data inversion, further improving the inversion accuracy of on-orbit applications.

[0063] Referring to Figure 2a , a flowchart of steps of another method for calibrating the gain of a reflection channel provided by an embodiment of the present invention is shown, which may specifically include the following steps:

[0064] Step S201, when a preset simulator is under preset connection conditions, obtain a gain deviation value of the occultation receiver, where the gain deviation value is a deviation caused by an actual AD sampling value;

[0065] Step S202, when a preset simulator is under preset connection conditions, determine the gain deviation value of the occultation receiver by adjusting the signal source output power of the preset simulator;

[0066] In practical applications, the signal source of the preset simulator can output a signal, the signal source output power of the output signal is known, and 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.

[0067] 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 a 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.

[0068] In an embodiment of the present invention, when a preset simulator is under preset connection conditions, 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:

[0069] Sub-step S11, adjust the signal source output power of the preset simulator, determine a first signal source output power when the actual AD sampling value is a preset value, and determine a second signal source output power when the AD target sampling value is a preset value;

[0070] In practical applications, when adjusting the output power of the signal source of the preset simulator, both the actual AD sampling value and the target AD sampling value change accordingly. Furthermore, a preset value can be set in advance. Then, during the process of adjusting the signal source output power, the first signal source output power when the actual AD sampling value is the preset value can be determined, and the second signal source output power when the target AD sampling value is the preset value can be determined, where the preset value is set according to the actual scenario.

[0071] Sub-step S12: Determine the gain deviation value of the occultation receiver based on the first signal source output power and the second signal source output power.

[0072] After obtaining the first signal source output power and the second signal source output power, the gain deviation value of the occultation receiver can be determined according to the first signal source output power and the second signal source output power.

[0073] Specifically, the difference between the first signal source output power and the second signal source output power is used as the gain deviation value of the occultation receiver.

[0074] That is, gain deviation value = first signal source output power - second signal source output power.

[0075] Step S203: Receive the DDM noise power output by the reflection channel;

[0076] Step S204: Determine the target gain of the occultation receiver at the target AD sampling value based on the gain deviation value, the target signal power value, and the DDM noise power.

[0077] Refer to Figure 2b , which is a schematic diagram of the principle for calibrating the gain deviation value caused by the change of the sampling value in the embodiment of the present invention. The simulator includes a signal source, a baseband part of the reflection channel, a Debug box, a MOXA, and a PC serial port display terminal. Among them, the baseband part of the reflection channel may include an AD and an FPGA.

[0078] Among them, the signal source output power is a known quantity. By precisely adjusting the output power of the signal, it is ensured that the signal power range at point B is -4 dBm to -6 dBm. Then, the insertion loss of the RF coaxial cable can be calibrated using a spectrum analyzer, enabling the signal output from the signal source to enter the AD for AD sampling. Then, the FPGA processes the AD sampling value, converts the sampling value into a target value through simple operations, and then enters the Debug box through a debugging cable. After the Debug box debugs the data, it then enters the MOXA box through a serial debugging cable. The MOXA box converts the 422 data into serial data and then enters the PC through a USB cable for serial display.

[0079] By precisely adjusting the output signal power intensity of the signal source, the output power P13.5 of the signal source when the system sampling target value is 13.5 can be obtained. Then, by adjusting the output power of the signal source, the output power P△ of the signal source corresponding to different target values can be obtained. When the sampling target value is adjusted to be the same as the target value of the system-connected simulator, = P 13.5 -P △ .

[0080] In the embodiment of the present invention, when the preset simulator is under the preset connection condition, by adjusting the output power of the signal source of the preset simulator, the gain deviation value of the occultation receiver is determined; the target signal power value input from the preset simulator into the reflection channel of 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 at the AD target sampling value is determined, realizing the calibration of the gain of the reflection channel.

[0081] Referring to Figure 3 , a step flowchart of a method for calibrating the gain of a reflection channel provided by an embodiment of the present invention is shown, which may specifically include the following steps:

[0082] Step S301, when the preset simulator is under the preset connection condition, obtain the gain deviation value of the occultation receiver, where the gain deviation value is the deviation caused by the AD actual sampling value;

[0083] Step S302, obtain the target signal power value input from the preset simulator into the reflection channel of the occultation receiver;

[0084] Step S303, receive the DDM noise power output by the reflection channel;

[0085] Step S304, determine the quotient of the DDM noise power and the target signal power value;

[0086] In practical applications, the relationship among the DDM noise power, the target signal power value, the gain deviation value, and the target gain is as follows:

[0087] DDM noise power = (target gain + gain deviation value) * target signal power value.

[0088] 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.

[0089] Step S305, determine the target gain of the occultation receiver at the AD target sampling value based on the difference between the quotient and the gain deviation value.

[0090] The formula for calculating the total gain of the reflection channel using the simulator signal is as follows:

[0091]

[0092] In the formula, Output the relevant power value of the DDM signal, is the ideal gain of the receiver when the AD target value is 13.5 under the environmental temperature T; is the deviation value of the receiver gain caused by the actual AD sampling value under the simulator connection condition, and this value can be obtained through calibration and is a known quantity; is the signal power value input into the reflection link, and this value can be obtained through calibration and can be adjusted to a known quantity.

[0093] Since there is only one unknown quantity in the formula , therefore, the total gain of the receiver can be calibrated through a set of observed values. Then, using this measured value, the calibration result of the total gain of the receiver reflection channel is corrected for errors.

[0094] In the embodiment of the present invention, when the preset simulator is under the preset connection condition, obtain the gain deviation value of the occultation receiver, and the gain deviation value is the deviation caused by the actual AD sampling value; obtain the target signal power value input from the preset simulator into the reflection channel of the occultation receiver; receive the DDM noise power output by the reflection channel; determine the quotient of the DDM noise power and the target signal power value; determine the target gain of the occultation receiver at the AD target sampling value based on the difference between the quotient and the gain deviation value, realizing the calibration of the reflection channel gain, providing a new error correction method, and further improving the data inversion accuracy.

[0095] Referring to Figure 4a , it shows the step flow chart of another method for calibrating the gain of the reflection channel provided by an embodiment of the present invention, which specifically may include the following steps:

[0096] Step S401, when the preset simulator is under the preset connection condition, obtain the gain deviation value of the occultation receiver, and the gain deviation value is the deviation caused by the actual AD sampling value;

[0097] Step S402, when the preset simulator inputs the simulator signal into the reflection channel of the occultation receiver, use a power meter connected to the preset simulator to collect the candidate signal power values at each power point;

[0098] In practical applications, a preset simulator can be connected to a power meter, which can be used to accurately measure the power of the collected signals to further improve the calibration accuracy. The sampling frequency and sampling period of the power meter can be preset, and then the candidate signal power values at the power points can be collected according to the sampling frequency and sampling period to calculate the target signal power value.

[0099] Step S403: Determine the target signal power value according to the candidate signal power values.

[0100] After collecting multiple candidate signal power points, the target signal power value can be determined based on the multiple candidate signal power points. Specifically, the average value of the multiple candidate signal power points can be used as the target signal power value.

[0101] Step S404: Receive the DDM noise power output by the reflection channel;

[0102] Step S405: Determine the target gain of the occultation receiver at the AD target sampling value based on the gain deviation value, the target signal power value, and the DDM noise power.

[0103] Refer to Figure 4b , which shows a schematic block diagram of the calibration principle of the output signal power of an embodiment of the present invention. Among them, the simulator is connected to the power meter and the industrial control computer, and the data recording PC is connected to the power meter.

[0104] The output power of the simulator can be set and adjusted through the industrial control computer, but it is regarded as an unknown quantity. The output port of the simulator is connected to the power meter through a radio frequency coaxial cable. The power meter accurately measures the power of the collected signals. To further improve the calibration accuracy, the data sampled by the power meter is transmitted to the data recording PC for statistics and averaging, and the statistical accuracy can reach 0.01 dB.

[0105] The industrial control computer sets the output power of the simulator. According to the actual working environment, the setting range is -115 dBm to -145 dBm, the step is 1 dB, and each power point stays for 5 minutes. 31 power points are accurately calibrated through the power meter and the data recording PC, and then considering the insertion loss of the radio frequency coaxial cable, the output power of the simulator can be accurately calculated. .

[0106] 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, and the gain deviation value is the deviation caused by the actual AD sampling value; when the preset simulator inputs a simulator signal into the reflection channel of the occultation receiver, a candidate signal power value at each power point is collected by a power meter connected to the preset simulator; 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 at the AD target sampling value is determined, realizing the calibration of the gain of the reflection channel, providing a new error correction method, and further improving the data inversion accuracy.

[0107] Refer to Figure 5a , which is a schematic diagram of the principle of a reflection channel calibration system according to an embodiment of 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 baseband processing. Among them, the reflection antenna can be used to receive GNSS reflection signals, and the input power is Pin. The LNA and the filter are used to amplify the reflection signals received by the reflection antenna and filter out out-of-band interference signals. The down-conversion channel is used to down-convert, intermediate-frequency amplify, intermediate-frequency filter, and AD sample the signals of the amplifier and the filter. The baseband processing is used to capture, track, and solve the sampled digital intermediate-frequency signals, and then output DDM correlation power values (i.e., the DDM noise observation values of the input calibration source).

[0108] Refer to Figure 5b , which is another schematic diagram of the principle of a reflection channel calibration system according to an embodiment of the present invention. The detailed design circuit of the reflection channel may include a reflection antenna, a cavity filter, a first-stage LNA, a radio frequency filter, a second-stage LNA, down-conversion, an intermediate-frequency amplifier, an intermediate-frequency filter, AD, a baseband FPGA, and a reflection DSP, etc.

[0109] The reflective antenna can be used to receive GNSS reflected signals and then transmit the signals to the cavity filter. The cavity filter filters the received reflected signals to remove out-of-band interference. The first-stage LNA amplifies the filtered signals with low noise and then transmits the signals to the RF filter. The RF filter can be used to suppress image interference. Then the signals enter the second-stage LNA for further amplification. The amplified signals enter the down-conversion module. The oven-controlled crystal oscillator provides the system clock and inputs it 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 signals, down-converts the RF signals into intermediate-frequency signals, and then enters the intermediate-frequency amplifier for intermediate-frequency amplification. The intermediate-frequency amplified signals enter the intermediate-frequency filter for intermediate-frequency filtering. The intermediate-frequency filtered signals enter the AD for analog-to-digital conversion. The converted intermediate-frequency digital signals enter the baseband FPGA for digital signal acquisition and tracking. The processed signals enter the reflective DSP for data inversion and solution, and output the DDM correlation power value (i.e., the DDM noise observation value of the input calibration source).

[0110] Reference Figure 5c , which is another overall test principle block diagram for the reflective channel calibration system implemented in the present invention. In this test, the simulator is used as the input signal source with known power. Under the environmental temperature condition that the temperature of the incubator is controlled at 0°C to 45°C, the acquisition of the DDM signals of the detector's reflective channel under different input signal power conditions is completed. Finally, through the later data processing, the calculation of the total link gain of the receiver is completed, the calibration error correction model and the AD sampling error correction model are established, and the look-up table and correction model required for calculating the input signal power from the DDM digital observation are established.

[0111] The occultation detector host is placed inside the high and low temperature chamber, and the ground equipment is placed outside the high and low temperature chamber. The GNSS signal simulator generates GNSS satellites. The signal at the rear port of the simulator is connected to the positioning and occultation channels of the occultation detector through the RF power divider. The calibrated signal at the front port of the simulator is connected to the reflective channel of the occultation detector through the RF cable. The linear regulated power supply provides the +28V system power for the occultation detector host. The occultation detector host is connected to the ground test equipment through the interface module. The interface module transmits the low-speed 422 data, high-speed 422 data, and 1553B data to the ground test equipment, and then transmits them to the data receiving PC through the USB bus for display and later data processing. The analog signal acquisition is measured using a multimeter.

[0112] It should be noted that, for the method embodiments, for the sake of simple description, they are expressed as a series of action combinations. However, those skilled in the art should be aware that the embodiments of the present invention are not limited by the described action sequences, because according to the embodiments of the present invention, certain steps can be performed in other sequences 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 essential for the embodiments of the present invention.

[0113] Referring to Figure 6 , a schematic structural diagram of a calibration device for the reflection channel gain provided by an embodiment of the present invention is shown, which may specifically include the following modules:

[0114] A gain deviation value acquisition module 601, configured to acquire the gain deviation value of the occultation receiver when a preset simulator is under a preset connection condition, where the gain deviation value is the deviation caused by the actual AD sampling value;

[0115] A target signal power value acquisition module 602, configured to acquire the target signal power value input by the preset simulator into the reflection channel of the occultation receiver;

[0116] A DDM noise power reception module 603, configured to receive the DDM noise power output by the reflection channel;

[0117] A target gain determination module 604, configured to determine the target gain of the occultation receiver at the AD target sampling value based on the gain deviation value, the target signal power value, and the DDM noise power.

[0118] In an embodiment of the present invention, the gain deviation value acquisition module 601 may include the following sub-steps:

[0119] A gain deviation value determination sub-module, configured 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 a preset connection condition.

[0120] In an embodiment of the present invention, the gain deviation value determination sub-module may include:

[0121] A model source output power determination unit, configured to adjust the signal source output power of the preset simulator to determine the first signal source output power when the actual AD sampling value is a preset value, and determine the second signal source output power when the AD target sampling value is a preset value;

[0122] A gain deviation value determination unit, configured to determine the gain deviation value of the occultation receiver based on the first signal source output power and the second signal source output power.

[0123] In an embodiment of the present invention, the gain deviation value determination unit may include:

[0124] A gain deviation value determination subunit, configured 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.

[0125] In an embodiment of the present invention, the target signal power value acquisition module 602 may include the following sub-modules:

[0126] A candidate signal power value determination sub-module, configured to collect candidate signal power values at 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;

[0127] A target signal power value determination sub-module, configured to determine a target signal power value according to the candidate signal power values.

[0128] In an embodiment of the present invention, the target gain determination module 604 may include:

[0129] A quotient value determination sub-module, configured to determine the quotient of the DDM noise power and the target signal power value;

[0130] A target gain determination sub-module, configured to determine the target gain of the occultation receiver at the AD target sampling value based on the difference between the quotient value and the gain deviation value.

[0131] In an embodiment of the present invention, the device further includes:

[0132] An error correction module, configured to perform error correction on the occultation receiver based on the target gain.

[0133] 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, where the gain deviation value is the deviation caused by the AD actual sampling value; the target signal power value input by the preset simulator to the reflection channel of the occultation receiver is obtained; the DDM noise power output by the reflection channel is received; and the target gain of the occultation receiver at the AD target sampling value is determined based on the gain deviation value, the target signal power value, and the DDM noise power. Through the embodiment of the present invention, the calibration of the gain of the reflection channel is realized, a new error correction method is provided, and the data inversion accuracy is further improved. By using a simulator signal source with a known signal strength and precisely controlling the ambient temperature and the digital control AGC, the high-precision calibration of the system is realized. The error correction of the pre-launch gain calibration of the system is performed, and the correction result is applied to the on-orbit data inversion, further improving the inversion accuracy of the on-orbit application.

[0134] An embodiment of the present invention further provides an electronic device, which may include a processor, a memory, and a computer program stored on the memory and capable of running on the processor. When the computer program is executed by the processor, the calibration method of the reflection channel gain as described above is implemented.

[0135] 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 calibration method of the reflection channel gain as described above is implemented.

[0136] For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For the relevant parts, please refer to the partial description of the method embodiment.

[0137] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0138] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a device, or a computer program product. Therefore, the embodiments of the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0139] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of 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 flowcharts and / or block diagrams, as well as the combination of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing terminal devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable data processing terminal devices generate a device for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0140] These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing terminal device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and the instruction device implements the functions in Figure 1 one process or multiple processes and / or blocks Figure 1The functions specified in one or more boxes.

[0141] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device, so that a series of operation steps are executed on the computer or other programmable terminal device to generate computer-implemented processing. Thus, the instructions executed on the computer or other programmable terminal device provide for implementing the steps of the functions specified in one or more processes and / or boxes Figure 1 One process or more processes and / or boxes Figure 1 The steps of the functions specified in one box or more boxes.

[0142] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0143] Finally, it should also be noted that in this article, relational terms such as first and second 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or terminal device comprising the said element.

[0144] The above has introduced in detail a calibration method, device, equipment, and medium for the reflection channel gain. Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to 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 a preset connection condition, adjusting the signal source output power of the preset simulator, determining the first signal source output power when the AD actual sampling value is a preset value, and determining the second signal source output power when the AD target sampling value is a preset value; The difference between the output power of the first signal source and the output power of the second signal source is used as a gain deviation value of the occultation receiver, 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 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.

3. 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.

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

5. 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; A target gain determination module, 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; Wherein, the gain deviation value acquisition module includes the following submodules: A gain deviation value determination submodule, 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 a preset connection condition; Wherein, the gain deviation value determination submodule includes: 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, configured to determine 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; Wherein, the gain deviation value determining unit comprises: 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.

6. 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 calibration method of the reflection channel gain as claimed in any one of claims 1 to 4 is implemented.

7. 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 4 is implemented.

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