Method, device, medium and system for pulse-by-pulse rapid identification of in-pulse linear frequency modulation signals

Abstract

The invention discloses a method, a device, a medium and a system for pulse-by-pulse rapid identification of an in-pulse linear frequency modulation signal, and belongs to the field of signal processing, and the method comprises the following steps: processing an intermediate frequency data stream of an input signal, and outputting frame data containing instantaneous phase, frequency, amplitude and azimuth information; collecting information of similar frame data, and performing signal parameter measurement to obtain parameter measurement information; obtaining intra-pulse linear modulation information of the signal pulse by using phase and frequency information of the frame data; and finally, gathering parameter measurement information and signal intra-pulse modulation information to form a PDW (pulse width modulation) so as to realize simultaneous processing of signal parameter measurement and signal intra-pulse feature extraction, thereby having the capability of identifying intra-pulse linear frequency modulation signals pulse by pulse. The method provided by the invention has a pulse-by-pulse intra-pulse linear frequency modulation characteristic identification capability, and can improve the signal sorting and identification capability.

Description

Technical Field

[0001] The present invention relates to the field of signal processing, and more specifically, to a method, device, medium, and system for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse. Background Art

[0002] Traditional methods for extracting intra-pulse characteristics of signals mainly use digital intermediate frequency processing methods, that is, high-speed AD samples the intermediate frequency signal, and through digital signal processing algorithms for the sampled data stream, the five major parameters of the pulse signal (pulse amplitude, pulse width, arrival time, carrier frequency, and arrival angle) can be accurately measured. At the same time, the linear frequency modulation characteristics within the pulse of the signal can be obtained through phase calculation.

[0003] The working timing of traditional signal intra-pulse detection, identification, and parameter measurement is shown in Figure 1 . High-speed AD samples the input intermediate frequency signal, and within t 1 , the intermediate frequency data stream of the signal is obtained through digital signal processing algorithms; then the intermediate frequency data stream is processed. One path is for signal parameter measurement, and within t 2 , the parameter information of the pulse signal is obtained to form PDW data; one path is through phase calculation, and within t 3 , the intra-pulse characteristics of the signal are obtained; finally, at time t 4 , the merging of signal parameters is completed. Figure 1 In 1 , t 2 is the digital signal processing algorithm time; t 3 is the signal parameter measurement time; t 4 is the signal intra-pulse algorithm calculation time; t

[0004] Since signal parameter measurement and signal intra-pulse characteristic extraction cannot be completed simultaneously, usually the signal intra-pulse characteristic extraction time is longer than the signal parameter measurement time. For complex electromagnetic environments with a high density of pulse signals, the intra-pulse characteristics of each pulse cannot be extracted in real time, and it will also cause matching errors between the intra-pulse characteristic parameters of the signal and the signal measurement parameters, as shown in Figure 2 , thus resulting in a decrease in the correct rate of signal sorting and identification. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method, device, medium, and system for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse, which has the ability to identify intra-pulse linear frequency modulation characteristics pulse by pulse and can improve signal sorting and identification capabilities.

[0006] The purpose of the present invention is achieved through the following solutions:

[0007] A method for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse includes the following steps:

[0008] By processing the intermediate frequency data stream of the input signal, frame data containing instantaneous phase, frequency, amplitude, and azimuth information is output;

[0009] Collect the information of similar frame data and perform signal parameter measurement to obtain parameter measurement information;

[0010] Then, using the phase and frequency information of the frame data, the in-pulse linear modulation information of the signal pulse is obtained;

[0011] Finally, summarize the parameter measurement information and the in-pulse modulation information of the signal to form a PDW, so as to realize the simultaneous processing of signal parameter measurement and in-pulse feature extraction of the signal, thereby having the ability to identify in-pulse linear frequency modulation signals pulse by pulse.

[0012] Further, the collection of the similar information of the similar frame data specifically includes: collecting the frequency, azimuth, and amplitude information of the similar frame data.

[0013] Further, the parameter measurement information includes frequency, pulse width, azimuth, and amplitude.

[0014] Further, the obtaining of the in-pulse linear frequency modulation information of the signal pulse by using the phase and frequency information of the frame data specifically includes: in the frequency information of the similar frame data, obtaining the bandwidth of the in-pulse large linear modulation signal through the frequency difference between the initial frame and the termination frame.

[0015] Further, the obtaining of the in-pulse linear frequency modulation information of the signal pulse by using the phase and frequency information of the frame data specifically includes: in the phase information of the similar frame data, obtaining the bandwidth of the in-pulse small linear modulation signal through the first-order difference of the phase sequence.

[0016] A device for quickly identifying in-pulse linear frequency modulation signals pulse by pulse includes a processor and a memory. A computer program is stored in the memory, and when the computer program is loaded by the processor, it executes the method described in any one of the above.

[0017] A computer-readable storage medium stores a computer program, and when the computer program is loaded by a processor, it executes the method described in any one of the above.

[0018] An electronic system includes the device for quickly identifying in-pulse linear frequency modulation signals pulse by pulse described above.

[0019] The beneficial effects of the present invention include:

[0020] The method of the present invention realizes the simultaneous processing of signal parameter measurement and in-pulse feature extraction of signals, forms PDWs containing in-pulse modulation information, improves the in-pulse recognition ability of pulse signals in signal processing, has the in-pulse linear frequency modulation feature recognition ability for each pulse, and thus can improve the signal sorting and recognition ability. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a timing diagram of the in-pulse detection, recognition, and parameter measurement processing of traditional signals;

[0023] Figure 2 It is a schematic diagram of the matching error between the in-pulse characteristic parameters and the signal measurement parameters of the signal;

[0024] Figure 3 It is a schematic diagram of the simultaneous processing of signal parameter measurement and in-pulse feature extraction of the embodiment of the present invention. Detailed Embodiments

[0025] All features disclosed in all embodiments in this specification, or all steps in the methods or processes implicitly disclosed, except for mutually exclusive features and / or steps, can be combined and / or extended and replaced in any way.

[0026] In order to solve the technical problems in the background, the inventors of the present invention believe after creative thinking that modern radiation source signals generally adopt in-pulse modulation waveforms with low intercept probability characteristics and spread spectrum characteristics. It has become very difficult to sort and recognize radar signals based on the five traditional parameters of pulse amplitude, pulse width, arrival time, carrier frequency, and arrival angle. In order to improve the in-pulse recognition ability of pulse signals in signal processing and have the in-pulse linear frequency modulation recognition ability for each pulse, the present invention proposes a scheme for quickly recognizing in-pulse linear frequency modulation signals for each pulse. The specific implementation process is as follows:

[0027] The main characteristic of a chirp signal is that its frequency changes with time, and the instantaneous frequency is the first derivative of the phase with respect to time, which is the first-order difference of the phase sequence in digital signals. By processing the intermediate-frequency data stream, frame data containing instantaneous phase, frequency, amplitude, and azimuth information is output. In parameter measurement and PDW formation, correct information of the same type is fused to obtain parameter measurement information of the PDW (including frequency, pulse width, azimuth, and amplitude); then, using the phase and frequency information of the frame data, the in-pulse chirp information of the signal pulse is obtained (as Figure 3 shown), enabling simultaneous processing of signal parameter measurement and in-pulse feature extraction of the signal, and having the ability to identify in-pulse chirp signals pulse by pulse. In a preferred embodiment, the method of the present invention specifically includes the following steps:

[0028] Step 1: Process the intermediate-frequency data stream of the input signal to form frame data containing instantaneous phase, frequency, amplitude, and azimuth information, and store them as RF1 - RFn, DOA1 - DOAn, PA1 - PAn, θ1 - θn respectively;

[0029] Step 2: Collect the frequency, azimuth, and amplitude information of the same-type frame data, perform signal parameter measurement, and obtain parameters such as signal frequency, azimuth, pulse width, and amplitude;

[0030] Step 3: Collect the frequency information of the same-type frame data, and obtain the bandwidth of the in-pulse large linear modulation signal by subtracting RF1 from RFn;

[0031] Step 4: Collect the phase information of the same-type frame data, and obtain the bandwidth of the in-pulse small linear modulation signal by taking the first-order difference of the phase sequence;

[0032] Step 5: Summarize the signal parameter measurement information and the in-pulse modulation information of the signal to form a PDW.

[0033] Through the above method of the present invention, simultaneous processing of signal parameter measurement and in-pulse feature extraction of the signal is achieved, and a PDW containing in-pulse modulation information is formed.

[0034] In other embodiments of the present invention, based on the above method, in a certain prototype, taking two signal inputs as an example, they are P a (PW = 10us, DOA = 45°, RF = 9300Hz, in-pulse chirp 1MHz), P b (PW = 10us, DOA = 70°, RF = 8700Hz, in-pulse chirp 100MHz), and the following steps are executed:

[0035] Step 1: Process the intermediate-frequency data stream of the input signal, and signals P a and P bOutput frame data containing instantaneous phase, frequency, amplitude, and azimuth information respectively;

[0036] Step 2: Collect the frequency, azimuth, and amplitude information of the same type of frame data, perform signal parameter measurement, and obtain signals P a and signal P b parameters such as frequency, azimuth, pulse width, and amplitude;

[0037] Step 3: For signal P a , collect the frequency information of the same type of frame data, and obtain the bandwidth of the large in-pulse linear modulation signal by subtracting RF1 from RFn, ΔRF = RFn - RF1, which is approximately equal to 100 MHz;

[0038] Step 4: For signal P b , collect the phase information of the same type of frame data, and obtain the bandwidth of the small in-pulse linear modulation signal ΔRF = Δθ / Δt by taking the first-order difference of the phase sequence, which is approximately equal to 1 MHz.

[0039] Step 5: Summarize the parameter measurement information of signal P a and the in-pulse modulation information of the signal to form PDWa; summarize the parameter measurement information of signal P b and the in-pulse modulation information of the signal to form PDWb.

[0040] It should be noted that within the scope of protection defined in the claims of the present invention, the following embodiments can be combined and / or extended, replaced in any logical manner from the above specific implementation manners, such as the disclosed technical principles, disclosed technical features, or implicitly disclosed technical features.

[0041] Embodiment 1

[0042] A method for quickly identifying in-pulse linear frequency modulation signals pulse by pulse, comprising the following steps:

[0043] By processing the intermediate frequency data stream of the input signal, output frame data containing instantaneous phase, frequency, amplitude, and azimuth information;

[0044] Collect the information of the same type of frame data and perform signal parameter measurement to obtain parameter measurement information;

[0045] Then, utilize the phase and frequency information of the frame data to obtain the in-pulse linear modulation information of the signal pulse;

[0046] Finally, summarize the parameter measurement information and the in-pulse modulation information of the signal to form PDW, so as to realize the simultaneous processing of signal parameter measurement and signal in-pulse feature extraction, and thus have the ability to identify in-pulse linear frequency modulation signals pulse by pulse.

[0047] Embodiment 2

[0048] Based on Embodiment 1, the homogeneous information for collecting homogeneous frame data specifically includes: collecting the frequency, azimuth, and amplitude information of the homogeneous frame data.

[0049] Embodiment 3

[0050] Based on Embodiment 1, the parameter measurement information includes frequency, pulse width, azimuth, and amplitude.

[0051] Embodiment 4

[0052] Based on Embodiment 1, obtaining the intra-pulse linear frequency modulation information of the signal pulse by using the phase and frequency information of the frame data specifically includes: in the frequency information of the homogeneous frame data, obtaining the bandwidth of the large intra-pulse linear modulation signal through the frequency difference between the initial frame and the termination frame.

[0053] Embodiment 5

[0054] Based on Embodiment 1, obtaining the intra-pulse linear frequency modulation information of the signal pulse by using the phase and frequency information of the frame data specifically includes: in the phase information of the homogeneous frame data, obtaining the bandwidth of the small intra-pulse linear modulation signal through the first-order difference of the phase sequence.

[0055] Embodiment 6

[0056] An apparatus for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse includes a processor and a memory. A computer program is stored in the memory, and when the computer program is loaded by the processor, it executes the method according to any one of Embodiments 1 to 5.

[0057] Embodiment 7

[0058] A computer-readable storage medium stores a computer program, and the computer program is loaded and executed by a processor to execute the method according to any one of Embodiments 1 to 5.

[0059] Embodiment 8

[0060] An electronic system includes the apparatus for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse according to Embodiment 6.

[0061] The units involved in the embodiments of the present invention can be implemented in software or in hardware, and the described units can also be provided in a processor. Among them, the names of these units do not constitute a limitation to the unit itself in some cases.

[0062] According to one aspect of an embodiment of the present invention, there is provided a computer program product or a computer program, the computer program product or the computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the methods provided in the above various alternative implementations.

[0063] As another aspect, an embodiment of the present invention further provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist separately without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the methods described in the above embodiment.

Claims

1. A method for quickly identifying a linear frequency modulation signal within a pulse on a pulse-by-pulse basis, characterized in that: The following steps are involved: By processing the intermediate frequency data stream of the input signal, frame data containing instantaneous phase, frequency, amplitude and azimuth information is output; Collect information of similar frame data, measure signal parameters, and obtain parameter measurement information; Then, the phase and frequency information of the frame data is used to obtain the intra-pulse linear modulation information of the signal pulse; Finally, the parameter measurement information and the signal intra-pulse modulation information are summarized to form a PDW to achieve simultaneous processing of signal parameter measurement and signal intra-pulse feature extraction, thereby having the ability to identify intra-pulse linear frequency modulation signals pulse by pulse.

2. The method for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse according to claim 1, characterized in that: The collecting of similar information of similar frame data specifically includes: collecting frequency, orientation, and amplitude information of similar frame data.

3. The method for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse according to claim 1, characterized in that: The parameter measurement information includes frequency, pulse width, direction and amplitude.

4. The method for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse according to claim 1, characterized in that: The method of obtaining the intra-pulse linear frequency modulation information of the signal pulse by using the phase and frequency information of the frame data specifically includes: obtaining the intra-pulse large linear modulation signal bandwidth by the frequency difference between the initial frame and the end frame in the same frame data frequency information.

5. The method for rapidly identifying intra-pulse linear frequency modulation signals pulse by pulse according to claim 1, characterized in that: The method of obtaining the intra-pulse linear frequency modulation information of the signal pulse by utilizing the phase and frequency information of the frame data specifically includes: obtaining the intra-pulse small linear modulation signal bandwidth by the first-order difference of the phase sequence in the same frame data phase information.

6. A device for quickly identifying a linear frequency modulation signal within a pulse, pulse by pulse, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is loaded by the processor, the method according to any one of claims 1 to 5 is executed.

7. A computer-readable storage medium, characterized in that: A computer program is stored in a readable storage medium, and the computer program is loaded by a processor to execute the method according to any one of claims 1 to 5.

8. An electronic system, characterized in that: The invention comprises the device for rapidly identifying the linear frequency modulation signal within a pulse on a pulse-by-pulse basis as described in claim 6.

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