CN116879855A - Radar electronic countermeasure signal processing system and method - Google Patents
Radar electronic countermeasure signal processing system and method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
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Abstract
The application relates to the technical field of signal processing, and provides a radar electronic countermeasure signal processing system and a method, wherein the system comprises the following steps: the thermal imaging device is used for collecting a thermal imaging image of the array channel; the temperature information extraction module is used for extracting temperature distribution information of the array channels according to the thermal imaging diagram; the channel dividing module is used for determining a channel to be corrected and a channel not to be corrected in the array channel according to the temperature distribution information; the sampling module is used for sampling signals by utilizing an independent clock source of each channel to obtain sampling information; and the signal processing module corrects the sampling information of the channel to be corrected based on the standard clock source to generate a real sampling signal. According to the application, the channels are divided into the channels to be corrected and the channels not to be corrected according to the environmental temperature value of each channel, and only the independent clock sources of the channels to be corrected are used for carrying out frequency sampling correction instead of all channels, so that the system operation load is reduced, and the system response speed and the signal synchronism of each channel are improved.
Description
Technical Field
The application relates to the technical field of signal processing, in particular to a radar electronic countermeasure signal processing system and a method.
Background
In the application fields of electronic reconnaissance, radio direction finding, digital array radar, phased array radar and the like, strict requirements are placed on the phase consistency of a plurality of receiving channels. The receiving channel comprises an antenna, a radio frequency front end, a frequency conversion channel, an intermediate frequency sampling part and the like.
The synchronization of the intermediate frequency sampling is a key link of system synchronization. The synchronous meaning of the intermediate frequency sampling is that the multipath ADC samples the intermediate frequency signal at the same time and synchronously gathers multipath data into the FPGA at the rear end. The synchronicity problem mainly comprises three aspects: (1) analog input link consistency: it is necessary to ensure amplitude and phase consistency from the intermediate frequency connector to the analog input pins of the ADC chip. (2) synchronicity of multiple ADC sampling instants: ensuring that all ADC chips sample at the same sampling instant, i.e. ensuring that the phases of the ADC input clocks are the same, is desirable. (3) multiplexing ADC sample data convergence alignment: and ensuring consistent time delay from the ADC to the FPGA on the digital receiving module, and converging the data of the digital receiving modules to the back-end equipment through optical fibers.
To meet the synchronization requirement, the multichannel receiver may employ an independent clock source to perform signal sampling, so that the system has the following advantages: (1) isolation and stability: the independent clock source can be separated from other systems, so that mutual interference is avoided. This isolation helps to ensure stability of the clock signal, reducing clock drift and jitter due to other system variations or disturbances. (2) flexibility: the selection of the independent clock source is not limited by other systems, and the proper high-precision clock source can be selected according to specific requirements. Thus, the requirements of different system components on the stability and the precision of the clock can be flexibly met. (3) fault tolerance: in some systems, if the shared clock source fails or is unstable, the operation of the overall system may be affected. The use of an independent clock source can improve the fault tolerance of the system and avoid single-point faults. (4) reducing coupling: in complex systems, coupling between components may result in increased complexity and debugging difficulties. The use of independent clock sources can reduce the coupling between components and simplify system design and debugging. And (5) accurate synchronization: for applications requiring highly accurate synchronization, such as communication, radar, measurement, etc., accurate synchronization can be better achieved by using an independent clock source, and system performance and measurement accuracy are improved. (6) energy saving: some systems may require clocks of different frequencies under different operating conditions. The independent clock source can adjust the clock frequency according to actual demands, thereby saving energy and power consumption.
However, the multi-channel receiver with independent clock sources is provided with the independent clock sources in each channel, so that when different temperature environments exist in different channels, the synchronous performance of sampled signals is poor due to different temperature drift when signals are sampled in each channel, and the complete synchronization of a plurality of independent channels cannot be realized, so that the system performance is influenced.
In some solutions, sampling correction is performed on the independent clock source configured by setting an external standard clock source to each channel, but due to the number of channels in the array channels, the external standard clock source cannot achieve a required sampling speed when sampling the independent clock source, for example, the frequency of the external standard clock source is 10 times that of the independent clock source of each channel, and the array channels have 100 channels, so that the external standard clock source cannot perform sampling correction on the frequencies of all the independent clock sources in each unit time, and still affects the signal synchronization of each independent channel.
Disclosure of Invention
In order to solve the above prior art problems, the application provides a radar electronic countermeasure signal processing system and a method thereof, which aim to solve the problem that the speed of sampling and correcting an independent clock source of each channel by adopting an external standard clock source cannot meet the requirement when the problem of signal synchronization of multiple channels is solved in the existing array channels.
In a first aspect of the application, there is provided a radar electronic countermeasure signal processing system, the system comprising:
a thermal imaging device configured to acquire a thermal imaging map of the array channel;
a temperature information extraction module configured to extract temperature distribution information of an array channel according to the thermal imaging map;
the channel dividing module is configured to determine a channel to be corrected and a channel not to be corrected in the array channel according to the temperature distribution information;
the sampling module is configured to sample signals by using independent clock sources configured on each channel to obtain sampling information;
and the signal processing module is configured to correct the sampling information of the channel to be corrected based on the standard clock source and generate a real sampling signal according to the sampling information.
Optionally, the temperature information extraction module specifically includes:
a pixel value extraction unit configured to extract a color pixel value of each pixel point in the thermal imaging map;
and the temperature distribution map generation unit is configured to acquire a mapping relation comparison table of preset color pixel values and temperature, and convert the thermal imaging map into a temperature distribution map based on the mapping relation comparison table.
Optionally, the channel dividing module specifically includes:
a channel locating unit configured to acquire positional information of each channel in the array channels, determine an ambient temperature value of each channel based on the positional information and the temperature profile;
the channel dividing unit is configured to acquire a correction temperature threshold value, and divide a plurality of channels in the array channel into a channel to be corrected and a channel not to be corrected according to the correction temperature threshold value;
the channels to be corrected are channels with the environmental temperature value higher than the correction temperature threshold value, and the channels not to be corrected are channels with the environmental temperature value not higher than the correction temperature threshold value.
Optionally, the sampling module specifically includes:
a sampling control signal generation unit;
wherein the sampling control signal generation unit is configured to generate a sampling control signal according to the sampling frequency of the sampling module and an independent clock signal of the independent clock source;
wherein the sampling control signal comprises the vibration times of the crystal oscillator of the independent clock source when each sampling action is executed.
Optionally, the sampling module specifically includes:
a sampling information output unit;
the sampling signal output unit is configured to execute signal sampling actions according to the sampling control signals and output sampling information corresponding to each signal sampling action;
the sampling information comprises the vibration times of the crystal oscillator corresponding to the signal sampling action and the signal amplitude obtained by sampling.
Optionally, the signal processing module specifically includes:
a frequency detection unit;
the frequency detection unit is configured to acquire a standard clock signal of a standard clock source and an independent clock signal of an independent clock source of a channel to be corrected, and frequency sample the independent clock signal by using the standard clock signal to acquire a real frequency value of the independent clock signal.
Optionally, the channel dividing module specifically includes:
an association channel determining unit;
wherein the associated channel determining unit is configured to determine channels to be corrected having the same ambient temperature value as associated channels according to the ambient temperature value of each channel to be corrected;
the signal processing module specifically comprises:
a frequency detection unit;
the frequency detection unit is configured to acquire a standard clock signal of a standard clock source and an independent clock signal of an independent clock source of any one channel to be corrected in associated channels with the same environmental temperature value, frequency sample the independent clock signal by using the standard clock signal, and take a real frequency value of the independent clock signal obtained by sampling as a real frequency value of each associated channel.
Optionally, the signal processing module specifically includes:
a correction coefficient determination unit;
a sampling signal generation unit;
the correction coefficient determining unit determines a correction coefficient according to the real frequency value of the independent clock signal and the standard frequency value of the standard clock signal;
the sampling signal generating unit corrects the sampling information according to the correction coefficient and generates a real sampling signal by using the corrected sampling information.
Optionally, the expression for determining the correction coefficient is specifically:
wherein, the liquid crystal display device comprises a liquid crystal display device,for correction factor, +.>For standard frequency value, +.>Is the true frequency value.
Optionally, the sampling signal generating unit specifically includes:
a sampling information corrector unit;
a sampling signal generation subunit;
the sampling information correction subunit corrects the vibration times of the crystal oscillator corresponding to each sampling action in the sampling information by using a correction coefficient;
wherein the sampling signal generation subunit draws a true sampling signal by using the corrected sampling information.
Optionally, the expression of the sampling information and the corrected sampling information is specifically:
wherein, the liquid crystal display device comprises a liquid crystal display device,for sampling information +.>For corrected sampling information, +.>Signal amplitude obtained for sampling, +.>The vibration frequency of the crystal oscillator.
In a second aspect of the present application, there is provided a radar electronic countermeasure signal processing method, including:
acquiring a thermal imaging image of the array channel;
extracting temperature distribution information of the array channels according to the thermal imaging diagram;
determining a channel to be corrected and a channel not to be corrected in the array channel according to the temperature distribution information;
signal sampling is carried out by utilizing an independent clock source configured on each channel, and sampling information is obtained;
and correcting the sampling information of the channel to be corrected based on the standard clock source, and generating a real sampling signal according to the sampling information.
The application has the beneficial effects that: according to the radar electronic countermeasure signal processing system and the method, the channels are divided into the channels to be corrected and the channels not to be corrected according to the environmental temperature value of each channel by collecting the thermal imaging image of the array channel, and only the independent clock sources of the channels to be corrected are subjected to frequency sampling correction instead of all channels, so that the system operation load is reduced, and the system response speed and the signal synchronism of each channel are improved.
Drawings
FIG. 1 is a schematic diagram of a radar electronic countermeasure signal processing system according to the present application;
FIG. 2 is a schematic diagram of a radar electronic countermeasure signal processing system according to the present application;
FIG. 3 is a schematic diagram of the application dividing an array channel into a channel to be corrected and a channel not to be corrected;
FIG. 4 is a schematic diagram of dividing a channel to be corrected into associated channels having the same ambient temperature value according to the present application;
fig. 5 is a schematic flow chart of a radar electronic countermeasure signal processing method provided by the application.
Reference numerals:
10-an independent clock module; a 20-sampling module; 30-a standard clock module; 40-a signal processing module; 50-a thermal imaging device; 60-a temperature information extraction module; 70-channel dividing module.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1:
referring to fig. 1, fig. 1 is a schematic structural diagram of a radar electronic countermeasure signal processing system according to an embodiment of the present application.
As shown in fig. 1, a radar electronic countermeasure signal processing system includes: a thermal imaging device 50, a temperature information extraction module 60, a channel division module 70, a sampling module 20, and a signal processing module 40.
Wherein the thermal imaging device 50 is configured to acquire a thermal imaging map of the array channel; the temperature information extraction module 60 is configured to extract temperature distribution information of the array channels according to the thermal imaging map; the channel dividing module 70 is configured to determine a channel to be corrected and a channel to be non-corrected in the array channels according to the temperature distribution information; the sampling module 20 is configured to sample signals by using an independent clock source configured to each channel, so as to obtain sampling information; the signal processing module 40 is configured to correct the sampling information of the channel to be corrected based on the standard clock source and generate a true sampling signal according to the sampling information.
It should be noted that, in the signal sampling scheme of the existing array channel, there are two sampling signal clock source setting schemes generally. One is: the array channels employ a shared clock source that provides a sampling clock signal to each channel of the receiver, and each channel performs a signal sampling action based on the sampling clock signal. However, in the scheme of sharing the clock source, if the shared clock source fails or is unstable, the operation of the whole system may be affected, i.e. the fault tolerance of the shared clock source is low. The second step is: the array channels adopt independent clock sources, sampling clock signals are provided by the independent clock sources configured on each channel, and each channel performs signal sampling actions according to the sampling clock signals. However, in the scheme of the independent clock source, when different channels have different temperature environments, different temperature drift is caused when signals are sampled, so that the signal synchronization obtained by sampling is poor. In some solutions, sampling correction is performed on the independent clock source configured by setting an external standard clock source to each channel, but due to the number of channels in the array channels, the external standard clock source cannot achieve a required sampling speed when sampling the independent clock source, for example, the frequency of the external standard clock source is 10 times that of the independent clock source of each channel, and the array channels have 100 channels, so that the external standard clock source cannot perform sampling correction on the frequencies of all the independent clock sources in each unit time, and still affects the signal synchronization of each independent channel.
Thus, the present embodiment proposes a multi-channel signal synchronization system for radar electronic countermeasure, as shown in fig. 2, the system includes at least one receiving channel, a standard clock module 30 and a signal processing module 40, the receiving channel includes an independent clock module 10 and a sampling module 20; after the received signal passes through the radio frequency front end, by configuring the standard clock module 30 for the array channels, each receiving channel obtains sampling information only through the independent clock signal of the independent clock module 10, and then drawing the real sampling signal according to the standard clock signal and the independent clock signal of the standard clock module 30 by utilizing the sampling information, the problem that different temperature drift exists when signals are sampled due to different temperature environments of different channels is solved, and the signal synchronism is poor. Compared with the signal sampling scheme of the traditional multichannel receiver, the embodiment only collects sampling information by utilizing the independent clock signals of each channel, does not fit and draw the sampling signals after collecting the sampling information, corrects the sampling information by utilizing the relation between the standard clock signals and the independent clock signals, corrects the temperature drift in the sampling information of each channel respectively, and fits and draws the sampling information after correction to obtain a real sampling signal.
On the basis of this, in order to solve the problem that the speed of sampling and correcting the independent clock source provided by the independent clock module 10 of each channel by the external standard clock source provided by the standard clock module 30 cannot meet the requirement, the embodiment configures the thermal imaging diagram of the acquisition array channel, divides the channels in the array channel into a channel to be corrected and a channel not to be corrected according to the temperature distribution information of the array channel extracted from the thermal imaging diagram, samples the independent clock source of each channel to obtain sampling information, corrects the sampling information of the channel to be corrected by using the standard clock source to generate a real sampling signal, and only performs frequency sampling correction on the independent clock source of the channel to be corrected instead of all channels by dividing the channels into the channel to be corrected and the channel not to be corrected, thereby reducing the system operation load and improving the system response speed and the signal synchronism of each channel.
In a preferred embodiment, the standard clock module 30 comprises a crystal configured in a constant temperature environment. When the sampling information is corrected, the relation between the standard clock signal and the independent clock signal is utilized, and the relation between the standard clock signal and each independent clock signal is not utilized, namely, even if the standard clock signal has errors, the relation between the standard clock signal and each independent clock signal is maintained unchanged as long as the stability of the standard clock signal is maintained, and the signal sampling of each channel is not influenced, so that the precision requirement on the standard clock module 30 is reduced, and the system cost and the maintenance cost are reduced. Meanwhile, due to the application of the independent clock modules 10, even if the independent clock module 10 of one channel in the receiver fails or is unstable, signal sampling of other channels cannot be affected, and when electronic investigation tasks are carried out according to the received signals in the follow-up process, only the failed or unstable channel received signals are removed, and normal operation of the tasks cannot be affected by utilizing other normal received signals.
In a preferred embodiment, the temperature information extraction module 60 specifically includes: a pixel value extraction unit configured to extract a color pixel value of each pixel point in the thermal imaging map; and the temperature distribution map generation unit is configured to acquire a mapping relation comparison table of preset color pixel values and temperature, and convert the thermal imaging map into a temperature distribution map based on the mapping relation comparison table.
On this basis, as shown in fig. 3, the channel dividing module 70 specifically includes: a channel locating unit configured to acquire positional information of each channel in the array channels, determine an ambient temperature value of each channel based on the positional information and the temperature profile; the channel dividing unit is configured to acquire a correction temperature threshold value, and divide a plurality of channels in the array channel into a channel to be corrected and a channel not to be corrected according to the correction temperature threshold value; the channels to be corrected are channels with the environmental temperature value higher than the correction temperature threshold value, and the channels not to be corrected are channels with the environmental temperature value not higher than the correction temperature threshold value.
In this embodiment, the basis for dividing the channels in the array channel into the channel to be corrected and the non-channel to be corrected is the environmental temperature value of each channel obtained by extracting through the thermal imaging chart, if the environmental temperature value is higher than the correction temperature threshold value, the channel is considered to have temperature drift or the temperature drift error that occurs at the environmental temperature exceeds the allowable range, and at this time, the channel is divided into the channel to be corrected; if the ambient temperature value is not higher than the correction temperature threshold value, the channel is considered to be free from temperature drift or the temperature drift error does not exceed the allowable range under the ambient temperature, and the channel is divided into channels which are not to be corrected. Thus, selective channel signal sampling correction is achieved by dividing the channel into a channel to be corrected and a channel not to be corrected.
In a preferred embodiment, the sampling module 20 specifically includes: and a sampling control signal generating unit. Wherein the sampling control signal generation unit is configured to generate a sampling control signal according to the sampling frequency of the sampling module 20 and the independent clock signal of the independent clock module 10; wherein the sampling control signal includes the number of vibrations of the crystal oscillator of the independent clock module 10 when each sampling action is performed. The sampling module 20 specifically includes: and a sampling information output unit. The sampling signal output unit is configured to execute signal sampling actions according to the sampling control signals and output sampling information corresponding to each signal sampling action; the sampling information comprises the vibration times of the crystal oscillator corresponding to the signal sampling action and the signal amplitude obtained by sampling.
When the sampling module 20 obtains the sampling information, the sampling control signal generating unit generates a sampling control signal based on the sampling frequency of the sampling module 20 and the independent clock signal of the independent clock module 10, and then performs the signal sampling action of each channel by using the sampling control signal to generate the sampling information. Compared with a sampling control signal based on a sampling time point in a traditional signal sampling scheme, the embodiment adopts the vibration times of the crystal oscillator corresponding to the signal sampling action to determine the sampling time, namely the generated sampling control signal records the signal sampling when each channel vibrates the crystal oscillator of an independent clock source, and the generated sampling information is the vibration times of the crystal oscillator corresponding to each sampling action and the signal amplitude obtained by sampling the sampling action. Therefore, when the drawing of the real sampling signal is carried out, the accurate real sampling signal can be obtained only by correcting the vibration times.
In a preferred embodiment, the signal processing module 40 specifically includes: and a frequency detection unit. The frequency detection unit is configured to acquire a standard clock signal and an independent clock signal of an independent clock source of a channel to be corrected, and frequency sample the independent clock signal by using the standard clock signal to acquire a real frequency value of the independent clock signal.
It should be noted that, the independent clock modules 10 under different temperature environments have different temperature drift, that is, the actual independent clock signal output by each independent clock module 10 has an error with the frequency of the designed independent clock signal. Therefore, when the relation between the standard clock signal and each independent clock signal is adopted to correct the sampling information, the real frequency value of the independent clock signal of each channel needs to be determined first, specifically, the standard clock signal is adopted to perform frequency sampling on the independent clock signal, and then the real frequency value corresponding to the standard clock signal is obtained, and it should be noted that, since the standard clock signal output by the standard clock module 30 is not an accurate clock signal, the real frequency value at this time is only the real frequency value corresponding to the standard clock signal, but only the relation between the standard clock signal and each independent clock signal needs to be known when the sampling information is corrected, so that the obtained real frequency value corresponding to the standard clock signal meets the correction requirement. Compared with the traditional multichannel receiver, the embodiment needs to ensure that the shared clock source has the clock signal with the absolute accurate frequency, the embodiment does not need to have excessive limitation on the frequency accuracy of the shared clock source, and can realize the synchronism of multichannel signal sampling by only ensuring the stability of the standard clock signal.
In a preferred embodiment, the channel dividing module 70 specifically includes: an association channel determining unit; wherein the associated channel determining unit is configured to determine channels to be corrected having the same ambient temperature value as the associated channel according to the ambient temperature value of each channel to be corrected. On this basis, the signal processing module 40 specifically includes: a frequency detection unit; the frequency detection unit is configured to acquire a standard clock signal of a standard clock source and an independent clock signal of an independent clock source of any one channel to be corrected in associated channels with the same environmental temperature value, frequency sample the independent clock signal by using the standard clock signal, and take a real frequency value of the independent clock signal obtained by sampling as a real frequency value of each associated channel.
In order to further reduce the system operation load, the number of channels to be corrected is still higher than the ratio of the standard clock signal to the independent clock signal, so that the problem that signal sampling correction cannot be performed on all channels to be corrected in unit time is solved. In this embodiment, when dividing the channels, the channels to be corrected having the same environmental temperature value are determined as the associated channels according to the environmental temperature value of each channel to be corrected, that is, the channels to be corrected having the same environmental temperature value are regarded as having the same temperature drift. Therefore, when the frequency detection unit utilizes the standard clock signal to sample and correct the independent clock signal of each channel to be corrected, the channel to be corrected with the same temperature drift is sampled only once, and then the real frequency value of the independent clock signal obtained by sampling is used as the real frequency value of each associated channel, so that the system operation load is greatly reduced, and the system response speed is improved.
As shown in fig. 4, there are 10 first channels with an environmental temperature value a and 5 second channels with an environmental temperature value B in the channels to be corrected, when the frequency detection unit samples the independent clock signal of each channel with the standard clock signal, sampling correction is performed from any one of the 10 first channels with an environmental temperature value a, sampling correction is performed from any one of the 5 second channels with an environmental temperature value B, and the obtained real frequency value is used as the real frequency value of the 5 second channels.
In a preferred embodiment, the signal processing module 40 specifically includes: and a correction coefficient determination unit and a sampling signal generation unit. The correction coefficient determining unit determines a correction coefficient according to the real frequency value of the independent clock signal and the standard frequency value of the standard clock signal; the sampling signal generating unit corrects the sampling information according to the correction coefficient and generates a real sampling signal by using the corrected sampling information. Specifically, an expression of the correction coefficient is determined, specifically:
wherein, the liquid crystal display device comprises a liquid crystal display device,for correction factor, +.>For standard frequency value, +.>Is the true frequency value.
In a preferred embodiment, the sampling signal generating unit specifically includes: the sampling information correction subunit and the sampling signal generation subunit. The sampling information correction subunit corrects the vibration times of the crystal oscillator corresponding to each sampling action in the sampling information by using a correction coefficient; wherein the sampling signal generation subunit draws a true sampling signal by using the corrected sampling information.
In a preferred embodiment, the expression of the sampling information and the corrected sampling information is specifically:
wherein, the liquid crystal display device comprises a liquid crystal display device,for sampling information +.>For corrected sampling information, +.>Signal amplitude obtained for sampling, +.>The vibration frequency of the crystal oscillator.
In determining the correction coefficient, the sampling information is corrected using the relationship between the standard clock signal and the independent clock signal. Specifically, the relationship between the standard clock signal and the independent clock signal is the ratio between the standard frequency value of the standard clock signal and the true frequency value of the independent clock signal. After the correction coefficient is obtained, the obtained sampling information can be corrected by using the correction coefficient, wherein the sampling information before correction is the vibration times of the crystal oscillator corresponding to each sampling action and the signal amplitude obtained by sampling the sampling action, and if the sampling information before correction is used for drawing the sampling signal, the vibration times of the crystal oscillator are influenced by the environmental temperature, so that a drawn sampling signal curve is influenced by temperature drift to be distorted; therefore, the correction method is to multiply the vibration times of the crystal oscillator corresponding to each sampling action by the correction coefficient, and the correction coefficient is the ratio between the standard frequency value of the standard clock signal and the real frequency value of the independent clock signal, so that after the vibration times of the crystal oscillator are multiplied by the correction coefficient, the sampling point offset influenced by temperature can be corrected to obtain corrected sampling information, and finally, the sampling signal of each channel of the receiver excluding the temperature influence can be obtained by drawing curves in a coordinate system by using a plurality of sampling points corresponding to the corrected sampling information.
Referring to fig. 5, fig. 5 is a flowchart of a radar electronic countermeasure signal processing method according to an embodiment of the present application.
As shown in fig. 5, a radar electronic countermeasure signal processing method includes the steps of:
s1: acquiring a thermal imaging image of the array channel;
s2: extracting temperature distribution information of the array channels according to the thermal imaging diagram;
s3: determining a channel to be corrected and a channel not to be corrected in the array channel according to the temperature distribution information;
s4: signal sampling is carried out by utilizing an independent clock source configured on each channel, and sampling information is obtained;
s5: and correcting the sampling information of the channel to be corrected based on the standard clock source, and generating a real sampling signal according to the sampling information.
In this embodiment, by acquiring the thermal imaging map of the array channel, the channels are divided into the channel to be corrected and the channel not to be corrected according to the environmental temperature value of each channel, and only the independent clock sources of the channel to be corrected are subjected to frequency sampling correction instead of all channels, so that the system operation load is reduced, and the system response speed and the signal synchronism of each channel are improved.
The specific implementation of the radar electronic countermeasure signal processing method of the present application is substantially the same as the embodiments of the radar electronic countermeasure signal processing system described above, and will not be described herein.
In describing embodiments of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "inner", "outer", "inside", "outside", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Wherein "inside" refers to an interior or enclosed area or space. "peripheral" refers to the area surrounding a particular component or region.
In the description of embodiments of the present application, the terms "first," "second," "third," "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third" and a fourth "may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In describing embodiments of the present application, it should be noted that the terms "mounted," "connected," and "assembled" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, unless otherwise specifically indicated and defined; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the description of embodiments of the application, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
In describing embodiments of the present application, it will be understood that the terms "-" and "-" are intended to be inclusive of the two numerical ranges, and that the ranges include the endpoints. For example: "A-B" means a range greater than or equal to A and less than or equal to B. "A-B" means a range of greater than or equal to A and less than or equal to B.
In the description of embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A radar electronic countermeasure signal processing system, comprising:
a thermal imaging device configured to acquire a thermal imaging map of the array channel;
a temperature information extraction module configured to extract temperature distribution information of an array channel according to the thermal imaging map;
the channel dividing module is configured to determine a channel to be corrected and a channel not to be corrected in the array channel according to the temperature distribution information;
the sampling module is configured to sample signals by using independent clock sources configured on each channel to obtain sampling information;
and the signal processing module is configured to correct the sampling information of the channel to be corrected based on the standard clock source and generate a real sampling signal according to the sampling information.
2. The radar electronic countermeasure signal processing system of claim 1, wherein the temperature information extraction module specifically includes:
a pixel value extraction unit configured to extract a color pixel value of each pixel point in the thermal imaging map;
and the temperature distribution map generation unit is configured to acquire a mapping relation comparison table of preset color pixel values and temperature, and convert the thermal imaging map into a temperature distribution map based on the mapping relation comparison table.
3. The radar electronic countermeasure signal processing system of claim 2, wherein the channel dividing module specifically includes:
a channel locating unit configured to acquire positional information of each channel in the array channels, determine an ambient temperature value of each channel based on the positional information and the temperature profile;
the channel dividing unit is configured to acquire a correction temperature threshold value, and divide a plurality of channels in the array channel into a channel to be corrected and a channel not to be corrected according to the correction temperature threshold value;
the channels to be corrected are channels with the environmental temperature value higher than the correction temperature threshold value, and the channels not to be corrected are channels with the environmental temperature value not higher than the correction temperature threshold value.
4. A radar electronic countermeasure signal processing system according to claim 3, wherein the sampling module specifically includes:
a sampling control signal generation unit;
wherein the sampling control signal generation unit is configured to generate a sampling control signal according to the sampling frequency of the sampling module and an independent clock signal of the independent clock source;
wherein the sampling control signal comprises the vibration times of the crystal oscillator of the independent clock source when each sampling action is executed.
5. The radar electronic countermeasure signal processing system of claim 4, wherein the sampling module specifically includes:
a sampling information output unit;
the sampling signal output unit is configured to execute signal sampling actions according to the sampling control signals and output sampling information corresponding to each signal sampling action;
the sampling information comprises the vibration times of the crystal oscillator corresponding to the signal sampling action and the signal amplitude obtained by sampling.
6. The radar electronic countermeasure signal processing system of claim 5, wherein the signal processing module specifically includes:
a frequency detection unit;
the frequency detection unit is configured to acquire a standard clock signal of a standard clock source and an independent clock signal of an independent clock source of a channel to be corrected, and frequency sample the independent clock signal by using the standard clock signal to acquire a real frequency value of the independent clock signal.
7. The radar electronic countermeasure signal processing system of claim 5, wherein the channel dividing module specifically includes:
an association channel determining unit;
wherein the associated channel determining unit is configured to determine channels to be corrected having the same ambient temperature value as associated channels according to the ambient temperature value of each channel to be corrected;
the signal processing module specifically comprises:
a frequency detection unit;
the frequency detection unit is configured to acquire a standard clock signal of a standard clock source and an independent clock signal of an independent clock source of any one channel to be corrected in associated channels with the same environmental temperature value, frequency sample the independent clock signal by using the standard clock signal, and take a real frequency value of the independent clock signal obtained by sampling as a real frequency value of each associated channel.
8. The radar electronic countermeasure signal processing system of claim 7, wherein the signal processing module specifically includes:
a correction coefficient determination unit;
a sampling signal generation unit;
the correction coefficient determining unit determines a correction coefficient according to the real frequency value of the independent clock signal and the standard frequency value of the standard clock signal;
the sampling signal generating unit corrects the sampling information according to the correction coefficient and generates a real sampling signal by using the corrected sampling information.
9. The radar electronic countermeasure signal processing system of claim 8, wherein the sampling signal generating unit specifically includes:
a sampling information corrector unit;
a sampling signal generation subunit;
the sampling information correction subunit corrects the vibration times of the crystal oscillator corresponding to each sampling action in the sampling information by using a correction coefficient;
wherein the sampling signal generation subunit draws a true sampling signal by using the corrected sampling information.
10. A method of radar electronic countermeasure signal processing, comprising:
acquiring a thermal imaging image of the array channel;
extracting temperature distribution information of the array channels according to the thermal imaging diagram;
determining a channel to be corrected and a channel not to be corrected in the array channel according to the temperature distribution information;
signal sampling is carried out by utilizing an independent clock source configured on each channel, and sampling information is obtained;
and correcting the sampling information of the channel to be corrected based on the standard clock source, and generating a real sampling signal according to the sampling information.
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| CN116961819A (en) * | 2023-09-15 | 2023-10-27 | 成都梓峡信息技术有限公司 | Signal sampling system and method for multichannel receiver of electronic reconnaissance system |
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