CN116466308A - Echo dynamic adjustment method, device, equipment, medium and radar echo simulator - Google Patents
Echo dynamic adjustment method, device, equipment, medium and radar echo simulator Download PDFInfo
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The invention relates to an echo dynamic adjustment method, an echo dynamic adjustment device, an echo dynamic adjustment equipment, a medium and a radar echo simulator, wherein the method comprises the following steps: acquiring radar working parameters and transmitting trigger pulses corresponding to a current period of a satellite-borne radar, and determining target baseband echo data from the pre-stored baseband echo data corresponding to different time widths and bandwidths according to the time widths and bandwidths; according to the distance tracking error, performing signal processing on the target baseband echo data to obtain a processed signal, wherein the distance tracking error corresponding to the processed signal is smaller than a set value; according to the emission trigger pulse, adjusting the sampling starting time to obtain an adjusted sampling starting time; and according to the adjusted sampling starting time and the processed signal, adjusting the frequency of the echo signal in the current period is realized. By the method, the synchronization of the echo simulator and the satellite-borne radar on the working time sequence and the working parameters can be realized, so that the radar load is comprehensively and fully tested.
Description
Technical Field
The invention relates to the technical field of space microwave remote sensing, in particular to an echo dynamic adjustment method, an echo dynamic adjustment device, an echo dynamic adjustment equipment, a medium and a radar echo simulator.
Background
For example, the satellite-borne radar altimeter satellite (the satellite is used for measuring the distance from the satellite to the sea surface and the sea surface height) in the domestic and foreign orbits basically adopts the radar of the declivity receiving system, so that the output signal bandwidth of the receiver can be effectively reduced, the radar sampling point number is greatly reduced, and the transmission pressure of satellite-ground data is lightened.
However, compared with a matched filtering receiving system radar, the deskew receiving system radar needs to track the distance between a target, namely, the distance between the target and the target, and dynamically adjusts the position of a radar receiving window according to the distance between the target and the radar, so that complete radar echo receiving is ensured. The characteristic of the declining receiving system radar determines that the satellite radar load needs to be subjected to on-orbit signal processing, so that the load integration test and the satellite ground assembly stage all need to comprehensively test radar load on-orbit signal processing software, and the satellite is ensured to work correctly after being in orbit.
At present, a target echo simulator is used in the ground test stage of the spaceborne radar, but the existing target echo simulator has defects in the test of the declined receiving system radar, and the existing target echo simulator does not have a mechanism for synchronizing with radar tracking control information, so that the test of radar load is incomplete and insufficient.
Therefore, in the prior art, in the echo process, the target echo simulator does not have a mechanism for synchronizing with radar tracking control information, so that the radar load is not fully tested.
Disclosure of Invention
The invention aims to solve at least one technical problem by providing a method, a device, equipment, a medium and a radar echo simulator for dynamically adjusting echo.
In a first aspect, the present invention solves the above technical problems by providing the following technical solutions: a method of echo dynamics adjustment, the method comprising:
acquiring radar working parameters and transmitting trigger pulses corresponding to a current period of a satellite-borne radar, wherein the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking error and sampling starting time, the distance tracking error is the difference between the position of an actual echo signal in a display window of the satellite-borne radar and a preset ideal position, and the sampling starting time is the time of the satellite-borne radar receiving the echo signal;
Determining target baseband echo data from the pre-stored baseband echo data corresponding to different time widths and bandwidths according to the time widths and the bandwidths;
performing signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal, wherein the distance tracking error corresponding to the processed signal is smaller than a set value;
according to the emission trigger pulse, the sampling starting time is adjusted, and the adjusted sampling starting time is obtained;
and according to the adjusted sampling starting time and the processed signal, realizing the adjustment of the frequency of the echo signal in the current period.
The beneficial effects of the invention are as follows: according to the distance tracking error of the space-borne radar in the radar working parameters corresponding to the current period, the time width corresponding to the time width and the bandwidth are subjected to signal processing, so that the distance tracking error corresponding to the processed signal is smaller than a set value, namely, the baseband echo data stored in the echo simulator can be synchronously and dynamically adjusted according to the radar working parameters of the space-borne radar, and meanwhile, the sampling starting moment is adjusted according to the emission trigger pulse, so that the working parameters of the radar and the echo signals can be synchronized, namely, the synchronization of the echo simulator and the space-borne radar in the working time sequence and the working parameters is realized, and the comprehensive and sufficient test of radar load is ensured.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the radar working parameters further comprise a distance tracking value, wherein the distance tracking value is the distance between the target measured in real time and the satellite-borne radar after the satellite-borne radar tracks the target, and the target is a relatively static target or a relatively moving target;
and performing signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal, where the signal processing includes:
if the target is a relatively stationary target, determining a first frequency spectrum shifting amount according to the distance tracking error, and performing frequency spectrum shifting on the target baseband echo data according to the first frequency spectrum shifting amount to obtain the processed signal;
if the target is a relative moving target, acquiring a preset distance change curve of the relative moving target, determining a target relative distance change amount according to the distance change curve, determining a second frequency spectrum moving amount according to the target relative distance change amount and the distance tracking error, and performing frequency spectrum moving on the target baseband echo data according to the second frequency spectrum moving amount to obtain the processed signal, wherein the distance change curve is a curve reflecting each preset distance change between the relative target movement and the satellite-borne radar in different periods.
The further scheme has the beneficial effect that for different types of targets tracked by the satellite-borne radar, different radar working parameters can be adopted to realize signal processing of target baseband echo data so as to meet different requirements.
Further, the adjusting the frequency of the echo signal in the current period according to the adjusted sampling start time and the processed signal includes:
quadrature modulation is carried out on the processed signals to obtain intermediate frequency signals with frequencies corresponding to the adjusted sampling starting moments;
and taking the adjusted sampling starting time as the playing time of the intermediate frequency signal to realize the adjustment of the frequency of the echo signal in the current period.
The further scheme has the beneficial effect that the synchronization of the echo simulator and the spaceborne radar can be realized on the time sequence, namely the sampling starting time through the quadrature modulation of the processed signals.
Further, if the target tracked by the spaceborne radar is a relatively moving target, for each pre-stored baseband echo data, the baseband echo data is determined by the following method:
acquiring a preset distance change curve of the relative moving target and real satellite data, wherein the real satellite data is a historical echo signal corresponding to the satellite-borne radar;
Determining the relative distance variation of the target according to the distance variation curve;
determining a third frequency spectrum moving amount according to the target relative distance variation;
and according to the third frequency spectrum shifting amount, performing frequency spectrum shifting on the real satellite data to obtain the baseband echo data.
The further scheme has the advantages that the real satellite data are processed according to the distance change curve, the baseband echo data suitable for the echo simulator can be obtained, the baseband echo data are obtained by using the real satellite data, and the radar system can be tested and evaluated more truly in function and performance.
Further, according to the third spectrum shifting amount, spectrum shifting is performed on the real satellite data to obtain the baseband echo data, including:
according to the third frequency spectrum shifting amount, performing frequency spectrum shifting on the real satellite data to obtain initial data;
and formatting the initial data to obtain the baseband echo data, wherein the data format of the baseband echo data is the data format corresponding to the echo simulator.
The adoption of the further scheme has the advantages that the initial data are generally floating point type data, the prestored data in the echo simulator are integers determined by the bit number of the D/A converter (analog-to-digital conversion), and therefore the initial data can be formatted to obtain the baseband echo data in the data format corresponding to the echo simulator.
Further, the method further comprises the steps of:
acquiring radar working parameters of a next period of the current period;
and according to the radar working parameters of the next period, realizing the adjustment of the frequency of the echo signal of the next period.
The adoption of the further scheme has the beneficial effect that the synchronization between the satellite-borne radar and the echo simulator can be ensured periodically through periodical adjustment.
In a second aspect, the present invention further provides a radar echo simulator for solving the above technical problem, including:
the system comprises a data processor, a data storage module and a radio frequency module;
the data processor is used for acquiring radar working parameters corresponding to a current period of a satellite-borne radar and transmitting trigger pulses, the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking error and sampling starting time, the distance tracking error is the difference between the position of an actual echo signal in a display window of the satellite-borne radar and a preset ideal position, and the sampling starting time is the time when the satellite-borne radar receives the echo signal;
the data storage module is used for storing baseband echo data corresponding to different bandwidths;
The data processor is further used for determining target baseband echo data from the data storage module according to the time width and the bandwidth; according to the distance tracking error, performing signal processing on the target baseband echo data to obtain a processed signal; according to the emission trigger pulse, the sampling starting time is adjusted, and the adjusted sampling starting time is obtained; according to the adjusted sampling starting time and the processed signal, the frequency of the echo signal in the current period is adjusted, wherein the distance tracking error corresponding to the processed signal is smaller than a set value;
the radio frequency module is used for inputting intermediate frequency echo data into the radar to be tested after digital-to-analog conversion, and the intermediate frequency echo data are processed signals output by the data processor.
In a third aspect, the present invention further provides an echo dynamic adjustment device for solving the above technical problem, where the device includes:
the system comprises a radar working parameter acquisition module, a sampling starting time and a sampling starting time, wherein the radar working parameter acquisition module is used for acquiring radar working parameters and transmitting trigger pulses corresponding to a satellite-borne radar in a current period, the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking errors and the sampling starting time, the distance tracking errors are differences between the positions of actual echo signals in a display window of the satellite-borne radar and preset ideal positions, and the sampling starting time is the time when the satellite-borne radar receives echo signals;
The target baseband echo data determining module is used for determining target baseband echo data from the pre-stored baseband echo data corresponding to different time widths and bandwidths according to the time widths and the bandwidths;
the signal processing module is used for carrying out signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal, and the distance tracking error corresponding to the processed signal is smaller than a set value;
the sampling starting time adjustment module is used for adjusting the sampling starting time according to the emission trigger pulse to obtain an adjusted sampling starting time;
and the echo frequency adjusting module is used for adjusting the frequency of the echo signal in the current period according to the adjusted sampling starting time and the processed signal.
In a fourth aspect, the present invention further provides an electronic device for solving the above technical problem, where the electronic device includes a memory, a processor, and a computer program stored on the memory and capable of running on the processor, and the processor implements the echo dynamic adjustment method of the present application when executing the computer program.
In a fifth aspect, the present invention further provides a computer readable storage medium, where a computer program is stored, where the computer program is executed by a processor to implement the echo dynamic adjustment method of the present application.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments of the present invention will be briefly described below.
Fig. 1 is a schematic flow chart of an echo dynamic adjustment method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a radar principle of a de-skew receiving system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an echo simulator according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an echo simulator connected to a radar load according to an embodiment of the present invention;
FIG. 5 is a flow chart of a relative stationary target echo data processing procedure according to an embodiment of the present invention;
FIG. 6 is a flow chart of a relative motion target echo data processing according to an embodiment of the present invention;
FIG. 7 is a flow chart of processing real satellite data into echo simulator usable data according to one embodiment of the present invention;
FIG. 8 is a schematic diagram of an echo dynamic adjusting device according to an embodiment of the present invention;
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the invention.
The following describes the technical scheme of the present invention and how the technical scheme of the present invention solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
The scheme provided by the embodiment of the invention can be applied to any application scene needing echo dynamic adjustment.
An embodiment of the present invention provides a possible implementation manner, as shown in fig. 1, and provides a flowchart of an echo dynamic adjustment method, where the method may be executed by an echo simulator. For convenience of description, the method provided by the embodiment of the present invention will be described below by taking an echo simulator as an execution body, and the method may include the following steps as shown in a flowchart in fig. 1:
Step S110, acquiring radar working parameters and transmitting trigger pulses corresponding to a satellite-borne radar in a current period, wherein the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking error and sampling starting time, the distance tracking error is the difference between the position of an actual echo signal in a display window of the satellite-borne radar and a preset ideal position, and the sampling starting time is the time when the satellite-borne radar receives the echo signal;
step S120, determining target baseband echo data from the pre-stored baseband echo data corresponding to different time widths and bandwidths according to the time widths and the bandwidths;
step S130, performing signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal, wherein the distance tracking error corresponding to the processed signal is smaller than a set value;
step S140, adjusting the sampling start time according to the emission trigger pulse, to obtain an adjusted sampling start time;
and step S150, adjusting the frequency of the echo signal in the current period according to the adjusted sampling starting time and the processed signal.
According to the method, signal processing is carried out on the time width and the time width corresponding to the bandwidth and the bandwidth according to the distance tracking error of the spaceborne radar in the radar working parameters corresponding to the current period, so that the distance tracking error corresponding to the processed signal is smaller than a set value, namely, the baseband echo data stored in the echo simulator can be synchronously and dynamically adjusted according to the radar working parameters of the spaceborne radar, meanwhile, the sampling starting moment is adjusted according to the emission trigger pulse, and the synchronization of the radar working parameters and the echo signals can be realized, namely, the synchronization of the echo simulator and the spaceborne radar in the working time sequence and the working parameters is realized, and the comprehensive and sufficient test of radar load is ensured.
The solution of the present invention will be further described with reference to the following specific examples, in which, for better understanding of the solution of the present application, the principles involved in the solution of the present application will be described with reference to fig. 2 and 3.
Because the on-board radar (hereinafter may be simply referred to as radar) does not have the characteristic of on-track maintenance capability, the on-board radar is required to be tested effectively and sufficiently in the ground development stage, and an effective way is to use an echo simulator to simulate the echo of a target tracked by the radar, input the echo into a receiving channel of the radar, and verify the on-track working state of the radar load. In addition, as the target echo needs to be subjected to distance tracking when the de-skew receiving system radar works, namely, the target needs to be subjected to distance tracking, the de-skew receiving system radar needs to be subjected to real-time signal processing and distance closed-loop tracking, and the echo of the simulator needs to be synchronized with the working parameters of the radar, which is a difficult problem faced by the ground testing stage of the current de-skew receiving system spaceborne radar.
Referring to fig. 2, S1, S2, S3 are time-frequency relation diagrams corresponding to echo signals of three different targets, taking one echo signal as an example, mixing the echo signal with a receiving reference signal Sref, and obtaining intermediate frequency echoes through low-pass filtering, wherein the intermediate frequency echoes of each target are sine waves with a single frequency, and the frequency of the sine waves is related to the time difference between the echo signal and the receiving reference signal.
The specific reasons for the above problems are as follows: the working principle of the de-skew receiving system radar is that when the target echo (the echo signal of the target) reaches the radar, the radar generates a receiving reference signal with the same frequency as the radar transmitting signal, the receiving reference signal and the target echo are mixed, and after low-pass filtering and quadrature demodulation, a baseband signal (also called as a baseband echo signal or baseband echo data) is obtained, and corresponds to the sine wave. The frequency of the baseband echo signal of the de-skew receiving system radar is determined by the time difference between the received reference signal and the target echo, and the time-frequency conversion relationship realizes the conversion of the time measurement of the radar into the frequency measurement.
And after the radar signal processor periodically collects, quantifies and processes the baseband echo signals to obtain the target distance, the radar can change the moment generated by receiving the reference signals in the next period so as to adapt to the change of the target distance. That is, the distance of the target of the next cycle and the timing of generation of the reception reference signal together determine the frequency of the radar echo (echo signal) of the next cycle. So if it is desired to use the echo simulator to more accurately test the radar load, the operation of the echo simulator must be synchronized with the operation of the radar load as much as possible, and the echo simulator changes the frequency of the echo in real time according to the operation parameters of the radar load. The difficulty associated with this is how to achieve dynamic adjustment of the echo signals, and to achieve synchronization of the operation of the echo simulator with the operation of the radar load.
In order to synchronize the operation of the echo simulator with the operation of the radar load, in this embodiment, the structure and the operation principle of the radar echo simulator are described with reference to fig. 3:
the radar echo simulator in the embodiment comprises a data processor, a data storage module and a radio frequency module;
the data processor is used for acquiring radar working parameters corresponding to a current period of a satellite-borne radar and transmitting trigger pulses, the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking error and sampling starting time, the distance tracking error is the difference between the position of an actual echo signal in a display window of the satellite-borne radar and a preset ideal position, and the sampling starting time is the time when the satellite-borne radar receives the echo signal;
after the data processor acquires the radar working parameters corresponding to the current period of the spaceborne radar, the data processor can acquire all the parameters by analyzing the radar working parameters. The preset ideal position refers to a position which can ensure complete receiving of radar echo, for example, a center position in a display window is a theoretical value.
The data storage module (up-conversion path shown in fig. 3) is used for storing the baseband echo data corresponding to different bandwidths and bandwidths.
Different time widths can correspond to different baseband echo data, different bandwidths can also correspond to different baseband echo data, and corresponding relations among each time width, each bandwidth and each baseband echo data are established, so that corresponding target baseband echo data can be determined according to the corresponding relations based on the bandwidths and the time widths in radar working parameters.
After acquiring radar operating parameters (corresponding to the operating parameter resolution shown in fig. 3), the data processor is further configured to determine target baseband echo data (corresponding to the pre-stored data read shown in fig. 3) from the data storage module according to the time width and the bandwidth; performing signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal (corresponding to echo calculation shown in fig. 3); adjusting the sampling start time according to the emission trigger pulse to obtain an adjusted sampling start time (corresponding to the digital delay shown in fig. 3); and according to the adjusted sampling starting time and the processed signal, realizing the adjustment of the frequency of the echo signal of the current period (corresponding to the intermediate frequency playing shown in fig. 3), wherein the distance tracking error corresponding to the processed signal is smaller than a set value.
The radio frequency module is used for inputting intermediate frequency echo data into the radar to be tested after digital-to-analog conversion, and the intermediate frequency echo data are processed signals output by the data processor.
Alternatively, referring to fig. 3, the radio frequency module may be formed of a frequency multiplier, a digital-to-analog converter, and a band-pass filter. The radio frequency module takes a 100MHz clock signal of the radar as a working reference, and the 100MHz clock signal is doubled to a required frequency and then is used as a clock signal required by digital-analog change. Under the reference of the clock signal, the digital-to-analog converter generates intermediate frequency echo data (also called as intermediate frequency signal), the intermediate frequency signal obtains the required intermediate frequency radar echo through a band-pass filter, and the required intermediate frequency radar echo is input to the tested radar for testing.
In the scheme of the application, in order to realize the working synchronization of the echo simulator and the radar load, the method mainly comprises the steps of working time sequence synchronization and working parameter synchronization, and particularly can refer to a connection schematic diagram between the radar load and a target echo simulator (also called a radar echo simulator) shown in fig. 4, and the synchronization of the radar working parameter and the radar working parameter of the echo simulator is realized by establishing an information synchronization mechanism between the echo simulator and the radar load.
In a first aspect, the timing of operations is synchronized
The playing time of the intermediate frequency signal (which refers to the signal after quadrature modulation of the processed signal, which will be described in detail later) is determined by the radar transmitting trigger pulse and the radar sampling starting time, and the clock source of the digital delayer used is 100MHz of the radar, which can ensure the synchronization of the working time sequence of the simulator and the working time sequence of the radar. The working time sequence of the radar system mainly comprises a transmitting trigger pulse and a sampling trigger pulse, the working time sequence of the echo simulator mainly comprises a transmitting trigger pulse, the pulses are generated based on the same clock source, the synchronization of the pulses can be ensured, and then the time sequence synchronization of the radar and the echo simulator can be ensured.
In a second aspect, operating parameter synchronization
And when the radar works, the working parameters are periodically adjusted, and after the period is finished, the radar packages the radar working parameters of the next period and sends the radar working parameters to the echo simulator. After receiving the parameter packet, the echo simulator analyzes the parameter packet information, processes pre-stored echo data in real time, namely, the processing process of the data processor, and in the next period, the frequency domain characteristics (such as frequency) of the radar echo (echo signal) correspond to the working parameters of the radar, so that the working synchronization of the radar echo (echo signal) and the working parameters of the radar is ensured.
With the above principle introduced, the method for dynamically adjusting echo provided in the present application will be described in detail with reference to fig. 1, and the method may include the following steps:
step S110, acquiring radar working parameters and transmitting trigger pulses corresponding to a satellite-borne radar in a current period, wherein the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking error and sampling starting time, the distance tracking error is the difference between the position of an actual echo signal in a display window of the satellite-borne radar and a preset ideal position, and the sampling starting time is the time when the satellite-borne radar receives the echo signal;
optionally, the radar working parameter further includes a distance tracking value, where the distance tracking value is a distance between the target measured in real time by the satellite-borne radar and the satellite-borne radar after the target is tracked by the satellite-borne radar.
Alternatively, the target is a relatively stationary target or a relatively moving target, the relatively stationary target refers to the relatively stationary target and the radar, and the relatively moving target refers to the relatively moving target and the radar.
Step S120, determining target baseband echo data from the pre-stored baseband echo data corresponding to different time widths and bandwidths according to the time widths and the bandwidths;
Step S130, performing signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal, wherein the distance tracking error corresponding to the processed signal is smaller than a set value;
optionally, because the target is a relatively stationary target or a relatively moving target, signal processing is performed on the target baseband echo data according to the distance tracking error to obtain a processed signal, where the signal processing includes:
if the target is a relatively stationary target, determining a first frequency spectrum shifting amount according to the distance tracking error, and performing frequency spectrum shifting on the target baseband echo data according to the first frequency spectrum shifting amount to obtain the processed signal;
specifically, the content of the corresponding portion of the above-mentioned step S120 and step S130 when the target is a relatively stationary target may be referred to the flowchart shown in fig. 5, and may specifically include the following steps:
a1, according to the bandwidth B and the time width tau in the radar working parameters, corresponding baseband echo data S are read from the pre-stored baseband echo data corresponding to different time widths and bandwidths 1 ，S 1 Namely, the target baseband echo data;
a2, calculating a first frequency spectrum moving amount according to the distance tracking error delta d in the radar working parameters Where c is the speed of light, 3 x 108 m/s.
A3, performing frequency spectrum shifting on the target baseband echo data in the time domain (namely performing frequency spectrum shifting on the target baseband echo data) to obtain adjusted baseband echo data S 2 Satisfy S 2 ＝S 1 ·e (j·2πΔft) ，S 2 The processed signal is obtained;
if the target is a relative moving target, acquiring a preset distance change curve of the relative moving target, determining a target relative distance change amount according to the distance change curve, determining a second frequency spectrum moving amount according to the target relative distance change amount and the distance tracking error, and performing frequency spectrum moving on the target baseband echo data according to the second frequency spectrum moving amount to obtain the processed signal, wherein the distance change curve is a curve reflecting each preset distance change between the relative target movement and the satellite-borne radar in different periods. The distance change curve refers to a curve which is assumed to be moving in advance in the test and is changed by the movement of the target, and can be understood as a change curve corresponding to each preset distance between the relative target movement and the spaceborne radar in different periods, and the preset distance can be understood as a theoretical distance.
Specifically, the content of the corresponding portion of the step S120 and the step S130 when the target is the relative moving target may refer to the flowchart shown in fig. 6, and may specifically include the following steps:
b1, according to the bandwidth B and the time width tau in the radar working parameters, corresponding baseband echo data S are read from the pre-stored baseband echo data corresponding to different time widths and bandwidths 1 ，S 1 Namely, the target baseband echo data; and reading a preset distance change curve d corresponding to the relative moving target n (n=1, 2,3,) n is an integer representing a cycle count of radar operation;
b2, according to the distance tracking error delta d and the target relative distance variation d in the radar working parameters n+1 -d n Calculating a second spectrum shift amountWherein c is the speed of light, 3 x 108 m/s, d n Represents the distance tracking value (i.e. the distance of the target from the spaceborne radar) corresponding to the current period, d n+1 A distance tracking value corresponding to the next cycle of the current cycle;
b3, performing spectrum shifting on the target baseband echo data in the time domain (i.e. performing spectrum shifting on the target baseband echo data according to the second spectrum shifting amount) to obtain adjusted baseband echo data S 2 Satisfy S 2 ＝S 1 ·e (j ·2πΔft) ，S 2 The processed signal is obtained;
step S140, adjusting the sampling start time according to the emission trigger pulse, to obtain an adjusted sampling start time;
And step S150, adjusting the frequency of the echo signal in the current period according to the adjusted sampling starting time and the processed signal.
Optionally, the adjusting the frequency of the echo signal in the current period according to the adjusted sampling start time and the processed signal includes:
quadrature modulation is carried out on the processed signals to obtain intermediate frequency signals with frequencies corresponding to the adjusted sampling starting moments; and taking the adjusted sampling starting time as the playing time of the intermediate frequency signal to realize the adjustment of the frequency of the echo signal in the current period.
Specifically, for the adjusted baseband echo data S 2 Quadrature modulation of the (processed signal) to the desired frequency f s Intermediate frequency signal of (2)Wherein f s I.e. the frequency corresponding to the adjusted sampling start time.
Alternatively, referring to fig. 7, if the target tracked by the on-board radar is a relatively moving target, for each pre-stored baseband echo data, the baseband echo data is determined by:
acquiring a preset distance change curve of the relative moving target and real satellite data, wherein the real satellite data is a historical echo signal corresponding to the satellite-borne radar, namely a real on-orbit echo signal of the radar of the same type as the satellite-borne radar;
Determining the relative distance change d of the target according to the distance change curve n -d n-1 Wherein d n Representing the distance tracking value corresponding to the current period, d n-1 A distance tracking value corresponding to the previous cycle of the current cycle;
determining a third frequency spectrum shifting amount according to the target relative distance variation
According to the third spectrum shifting amount, performing spectrum shifting on the real satellite data to obtain the baseband echo data S 1 。
Optionally, according to the third spectrum shifting amount, spectrum shifting is performed on the real satellite data to obtain the baseband echo data S 1 May include: performing FFT on real satellite data to obtain first data, performing spectrum shifting on the first data according to the third spectrum shifting amount to obtain second data, and performing IFFT on the second data to obtain baseband echo data S 1 。
Optionally, the performing spectrum shifting on the real satellite data according to the third spectrum shifting amount to obtain the baseband echo data includes:
according to the third spectrum shifting amount, performing spectrum shifting on the real satellite data to obtain initial data (alternatively, the initial data may also be third data obtained by performing IFFT processing on the second data);
And formatting the initial data to obtain the baseband echo data, wherein the data format of the baseband echo data is the data format corresponding to the echo simulator, and storing the baseband echo data into the echo simulator.
Optionally, the distance change curve d obtained by ground data processing is saved n (n=1, 2,3,..n is an integer representing the cycle count of radar operation) as a range profile file for a moving object; the distance change curve file of the moving object can be redesigned according to the verification requirement.
Optionally, the method further comprises:
acquiring radar working parameters of a next period of the current period;
and according to the radar working parameters of the next period, realizing the adjustment of the frequency of the echo signal of the next period.
Compared with the prior art, the scheme of the invention has the following beneficial effects:
(1) Firstly, the synchronization of the working parameters of the radar and the working parameters of the echo simulator is realized by establishing an information synchronization mechanism between the echo simulator and the radar load;
(2) The rapid signal processing method is adopted to realize the synchronization of the radar working parameters and the target echo, and the echo data stored in the simulator can be synchronously and dynamically adjusted according to the working parameters of the radar load;
(3) Corresponding signal processing methods are designed aiming at a relative static target and a relative moving target;
(4) Through the synchronization of the radar working parameters and the target echo, the radar load is subjected to a satellite-ground semi-physical injection simulation test in the surface test stage, and the radar load on-orbit signal processing algorithm can be fully verified;
(5) The adopted data processing algorithm can convert the real on-orbit echo data of the same type of radar load into echo signals suitable for the tested radar load.
Based on the same principle as the method shown in fig. 1, the embodiment of the present invention further provides an echo dynamic adjustment device 20, as shown in fig. 8, the echo dynamic adjustment device 20 may include a radar operating parameter acquisition module 210, a target baseband echo data determination module 220, a signal processing module 230, a sampling start time adjustment module 240, and an echo frequency adjustment module 250, where:
the radar working parameter obtaining module 210 is configured to obtain a radar working parameter corresponding to a current period of a spaceborne radar and transmit a trigger pulse, where the spaceborne radar is a de-skew receiving system spaceborne radar, the radar working parameter includes a bandwidth, a time width, a distance tracking error and a sampling start time, the distance tracking error is a difference between a position of an actual echo signal in a display window of the spaceborne radar and a preset ideal position, and the sampling start time is a time when the spaceborne radar receives the echo signal;
A target baseband echo data determining module 220, configured to determine target baseband echo data from the pre-stored baseband echo data corresponding to different time bandwidths and bandwidths according to the time bandwidths and the bandwidths;
the signal processing module 230 is configured to perform signal processing on the target baseband echo data according to the distance tracking error, so as to obtain a processed signal, where the distance tracking error corresponding to the processed signal is smaller than a set value;
a sampling start time adjustment module 240, configured to adjust the sampling start time according to the transmission trigger pulse, to obtain an adjusted sampling start time;
and the echo frequency adjusting module 250 is configured to implement adjustment of the frequency of the echo signal in the current period according to the adjusted sampling start time and the processed signal.
Optionally, the target is a relatively stationary target or a relatively moving target;
the signal processing module 230 is specifically configured to, when performing signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal:
if the target is a relatively stationary target, determining a first frequency spectrum shifting amount according to the distance tracking error, and performing frequency spectrum shifting on the target baseband echo data according to the first frequency spectrum shifting amount to obtain the processed signal;
If the target is a relative moving target, acquiring a preset distance change curve of the relative moving target, determining a target relative distance change amount according to the distance change curve, determining a second frequency spectrum moving amount according to the target relative distance change amount and the distance tracking error, and performing frequency spectrum moving on the target baseband echo data according to the second frequency spectrum moving amount to obtain the processed signal, wherein the distance change curve is a curve reflecting each preset distance change between the relative target movement and the satellite-borne radar in different periods.
Optionally, the echo frequency adjustment module 250 is specifically configured to, when implementing adjustment of the frequency of the echo signal in the current period according to the adjusted sampling start time and the processed signal:
quadrature modulation is carried out on the processed signals to obtain intermediate frequency signals with frequencies corresponding to the adjusted sampling starting moments;
and taking the adjusted sampling starting time as the playing time of the intermediate frequency signal to realize the adjustment of the frequency of the echo signal in the current period.
Optionally, if the target tracked by the spaceborne radar is a relative moving target, for pre-stored baseband echo data, the baseband echo data is determined by the following first module:
Acquiring a preset distance change curve of the relative moving target and real satellite data, wherein the real satellite data is historical echo data corresponding to the satellite-borne radar;
the first module is used for determining the relative distance variation of the target according to the distance variation curve; determining a third frequency spectrum moving amount according to the target relative distance variation; and according to the third frequency spectrum shifting amount, performing frequency spectrum shifting on the real satellite data to obtain the baseband echo data.
Optionally, when the first module performs spectrum shifting on the real satellite data according to the third spectrum shifting amount to obtain the baseband echo data, the first module is specifically configured to:
according to the third frequency spectrum shifting amount, performing frequency spectrum shifting on the real satellite data to obtain initial data;
and formatting the initial data to obtain the baseband echo data, wherein the data format of the baseband echo data is the data format corresponding to the echo simulator.
Optionally, the apparatus further comprises:
the periodicity adjustment module is used for acquiring radar working parameters of a next period of the current period; and according to the radar working parameters of the next period, realizing the adjustment of the frequency of the echo signal of the next period.
The echo dynamic adjustment device according to the embodiment of the present invention may execute the echo dynamic adjustment method provided by the embodiment of the present invention, and its implementation principle is similar, and actions executed by each module and unit in the echo dynamic adjustment device according to each embodiment of the present invention correspond to steps in the echo dynamic adjustment method according to each embodiment of the present invention, and detailed functional descriptions of each module of the echo dynamic adjustment device may be referred to the descriptions in the corresponding echo dynamic adjustment method shown in the foregoing, which are not repeated herein.
The echo dynamic adjusting device may be a computer program (including program code) running in a computer device, for example, the echo dynamic adjusting device is an application software; the device can be used for executing corresponding steps in the method provided by the embodiment of the invention.
In some embodiments, the echo dynamics adjustment device provided by the embodiments of the present invention may be implemented by combining software and hardware, and by way of example, the echo dynamics adjustment device provided by the embodiments of the present invention may be a processor in the form of a hardware decoding processor that is programmed to perform the echo dynamics adjustment method provided by the embodiments of the present invention, for example, the processor in the form of a hardware decoding processor may employ one or more application specific integrated circuits (ASIC, application Specific Integrated Circuit), DSP, programmable logic device (PLD, programmable Logic Device), complex programmable logic device (CPLD, complex Programmable Logic Device), field programmable gate array (FPGA, field-Programmable Gate Array), or other electronic components.
In other embodiments, the echo dynamics adjustment device provided in the embodiments of the present invention may be implemented in software, and fig. 8 shows the echo dynamics adjustment device stored in a memory, which may be software in the form of a program, a plug-in unit, or the like, and includes a series of modules including a radar operating parameter acquisition module 210, a target baseband echo data determination module 220, a signal processing module 230, a sampling start time adjustment module 240, and an echo frequency adjustment module 250, which are configured to implement the echo dynamics adjustment method provided in the embodiments of the present invention.
The modules involved in the embodiments of the present invention may be implemented in software or in hardware. The name of a module does not in some cases define the module itself.
Based on the same principles as the methods shown in the embodiments of the present invention, there is also provided in the embodiments of the present invention an electronic device, which may include, but is not limited to: a processor and a memory; a memory for storing a computer program; a processor for executing the method according to any of the embodiments of the invention by invoking a computer program.
In an alternative embodiment, there is provided an electronic device, as shown in fig. 9, the electronic device 4000 shown in fig. 9 includes: a processor 4001 and a memory 4003. Wherein the processor 4001 is coupled to the memory 4003, such as via a bus 4002. Optionally, the electronic device 4000 may further comprise a transceiver 4004, the transceiver 4004 may be used for data interaction between the electronic device and other electronic devices, such as transmission of data and/or reception of data, etc. It should be noted that, in practical applications, the transceiver 4004 is not limited to one, and the structure of the electronic device 4000 is not limited to the embodiment of the present invention.
The processor 4001 may be a CPU (Central Processing Unit ), general purpose processor, DSP (Digital Signal Processor, data signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field Programmable Gate Array, field programmable gate array) or other programmable logic device, transistor logic device, hardware components, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor 4001 may also be a combination that implements computing functionality, e.g., comprising one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.
Bus 4002 may include a path to transfer information between the aforementioned components. Bus 4002 may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus or an EISA (Extended Industry Standard Architecture ) bus, or the like. The bus 4002 can be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 9, but not only one bus or one type of bus.
Memory 4003 may be, but is not limited to, ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, RAM (Random Access Memory ) or other type of dynamic storage device that can store information and instructions, EEPROM (Electrically Erasable Programmable Read Only Memory ), CD-ROM (Compact Disc Read Only Memory, compact disc Read Only Memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
The memory 4003 is used for storing application program codes (computer programs) for executing the present invention and is controlled to be executed by the processor 4001. The processor 4001 is configured to execute application program codes stored in the memory 4003 to realize what is shown in the foregoing method embodiment.
The electronic device shown in fig. 9 is only an example, and should not impose any limitation on the functions and application scope of the embodiment of the present invention.
Embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, which when run on a computer, causes the computer to perform the corresponding method embodiments described above.
According to another aspect of the present invention, there is also provided a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the methods provided in the implementation of the various embodiments described above.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
It should be appreciated that the flow charts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The computer readable storage medium according to embodiments of the present invention may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer-readable storage medium carries one or more programs which, when executed by the electronic device, cause the electronic device to perform the methods shown in the above-described embodiments.
The above description is only illustrative of the preferred embodiments of the present invention and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the disclosure referred to in the present invention is not limited to the specific combinations of technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the spirit of the disclosure. Such as the above-mentioned features and the technical features disclosed in the present invention (but not limited to) having similar functions are replaced with each other.
Claims (10)
1. An echo dynamic adjustment method is characterized by comprising the following steps:
acquiring radar working parameters and transmitting trigger pulses corresponding to a current period of a satellite-borne radar, wherein the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking error and sampling starting time, the distance tracking error is the difference between the position of an actual echo signal in a display window of the satellite-borne radar and a preset ideal position, and the sampling starting time is the time of the satellite-borne radar receiving the echo signal;
determining target baseband echo data from the pre-stored baseband echo data corresponding to different time widths and bandwidths according to the time widths and the bandwidths;
performing signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal, wherein the distance tracking error corresponding to the processed signal is smaller than a set value;
according to the emission trigger pulse, the sampling starting time is adjusted, and the adjusted sampling starting time is obtained;
and according to the adjusted sampling starting time and the processed signal, realizing the adjustment of the frequency of the echo signal in the current period.
2. The method of claim 1, wherein the target is a relatively stationary target or a relatively moving target;
and performing signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal, wherein the signal processing comprises the following steps:
if the target is a relatively stationary target, determining a first frequency spectrum shifting amount according to the distance tracking error, and performing frequency spectrum shifting on the target baseband echo data according to the first frequency spectrum shifting amount to obtain the processed signal;
if the target is a relative moving target, acquiring a preset distance change curve of the relative moving target, determining a target relative distance change amount according to the distance change curve, determining a second frequency spectrum moving amount according to the target relative distance change amount and the distance tracking error, and performing frequency spectrum moving on the target baseband echo data according to the second frequency spectrum moving amount to obtain the processed signal, wherein the distance change curve is a curve reflecting each preset distance change between the relative target movement and the satellite-borne radar in different periods.
3. The method according to claim 1, wherein said adjusting the frequency of the echo signal of the current period based on the adjusted sampling start time and the processed signal comprises:
Quadrature modulation is carried out on the processed signals to obtain intermediate frequency signals with frequencies corresponding to the adjusted sampling starting moments;
and taking the adjusted sampling starting time as the playing time of the intermediate frequency signal to realize the adjustment of the frequency of the echo signal in the current period.
4. A method according to any one of claims 1 to 3, wherein if the target tracked by the on-board radar is a relatively moving target, for each pre-stored baseband echo data, the baseband echo data is determined by:
acquiring a preset distance change curve of the relative moving target and real satellite data, wherein the real satellite data is a historical echo signal corresponding to the satellite-borne radar;
determining the relative distance variation of the target according to the distance variation curve;
determining a third frequency spectrum moving amount according to the target relative distance variation;
and according to the third frequency spectrum shifting amount, performing frequency spectrum shifting on the real satellite data to obtain the baseband echo data.
5. The method of claim 4, wherein the performing spectrum shifting on the real satellite data according to the third spectrum shift amount to obtain the baseband echo data includes:
According to the third frequency spectrum shifting amount, performing frequency spectrum shifting on the real satellite data to obtain initial data;
and formatting the initial data to obtain the baseband echo data, wherein the data format of the baseband echo data is the data format corresponding to the echo simulator.
6. A method according to any one of claims 1 to 3, further comprising:
acquiring radar working parameters of a next period of the current period;
and according to the radar working parameters of the next period, realizing the adjustment of the frequency of the echo signal of the next period.
7. The radar echo simulator is characterized by comprising a data processor, a data storage module and a radio frequency module;
the data processor is used for acquiring radar working parameters corresponding to a current period of a satellite-borne radar and transmitting trigger pulses, the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking error and sampling starting time, the distance tracking error is the difference between the position of an actual echo signal in a display window of the satellite-borne radar and a preset ideal position, and the sampling starting time is the time when the satellite-borne radar receives the echo signal;
The data storage module is used for storing baseband echo data corresponding to different bandwidths;
the data processor is further used for determining target baseband echo data from the data storage module according to the time width and the bandwidth; according to the distance tracking error, performing signal processing on the target baseband echo data to obtain a processed signal; according to the emission trigger pulse, the sampling starting time is adjusted, and the adjusted sampling starting time is obtained; according to the adjusted sampling starting time and the processed signal, the frequency of the echo signal in the current period is adjusted, wherein the distance tracking error corresponding to the processed signal is smaller than a set value;
the radio frequency module is used for inputting intermediate frequency echo data into the radar to be tested after digital-to-analog conversion, and the intermediate frequency echo data are processed signals output by the data processor.
8. An echo dynamics adjustment device, comprising:
the system comprises a radar working parameter acquisition module, a sampling starting time and a sampling starting time, wherein the radar working parameter acquisition module is used for acquiring radar working parameters and transmitting trigger pulses corresponding to a satellite-borne radar in a current period, the satellite-borne radar is a de-skew receiving system satellite-borne radar, the radar working parameters comprise bandwidth, time width, distance tracking errors and the sampling starting time, the distance tracking errors are differences between the positions of actual echo signals in a display window of the satellite-borne radar and preset ideal positions, and the sampling starting time is the time when the satellite-borne radar receives echo signals;
The target baseband echo data determining module is used for determining target baseband echo data from the pre-stored baseband echo data corresponding to different time widths and bandwidths according to the time widths and the bandwidths;
the signal processing module is used for carrying out signal processing on the target baseband echo data according to the distance tracking error to obtain a processed signal, and the distance tracking error corresponding to the processed signal is smaller than a set value;
the sampling starting time adjustment module is used for adjusting the sampling starting time according to the emission trigger pulse to obtain an adjusted sampling starting time;
and the echo frequency adjusting module is used for adjusting the frequency of the echo signal in the current period according to the adjusted sampling starting time and the processed signal.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1-6 when the computer program is executed.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the method of any of claims 1-6.
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