CN114035163A - Method for processing radar echo signal based on algorithm model - Google Patents
Method for processing radar echo signal based on algorithm model Download PDFInfo
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- CN114035163A CN114035163A CN202111536860.3A CN202111536860A CN114035163A CN 114035163 A CN114035163 A CN 114035163A CN 202111536860 A CN202111536860 A CN 202111536860A CN 114035163 A CN114035163 A CN 114035163A
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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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
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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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
- G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
- G01S7/2928—Random or non-synchronous interference pulse cancellers
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Abstract
The invention belongs to the technical field of radar signal processing, in particular to a method for processing radar echo signals based on an algorithm model, which comprises the following steps: step 1, radar echo signal acquisition and preprocessing: the method comprises the steps that signals transmitted by a radar signal transmitter are reflected by a target, processed through a radar signal receiver, preprocessed through a signal preprocessing module and built into a simulation signal model, wherein the radar echo signals are linear frequency modulation signals; step 2, extracting, analyzing and deskewing the characteristics of the radar echo signals; step 3, establishing an algorithm model to optimize radar echo signals; step 4, reconstructing the radar echo signal; the invention has the beneficial effects that: the method has the effects of simple operation steps, high reliability and high processing precision, and can effectively solve the simulation problem of radar echo signal processing by combining a digital signal processing theory and an algorithm model.
Description
Technical Field
The invention belongs to the technical field of radar signal processing, and particularly relates to a method for processing radar echo signals based on an algorithm model.
Background
The traditional radar system basically takes two aspects of 'hardware technology as the center' and 'special function oriented' as development modes. While they can meet the required requirements in both signal processing and data processing speed and accuracy, they limit the versatility and flexibility of the overall radar system. The software radar has three characteristics of standardization, digitization and modularization, and is a development mode taking software technology as a core and facing application requirements and a radar system based on an open system architecture. The software radar architecture adopts an open system architecture, can adopt advanced technologies of more technical units in a radar system, and can promote the performance improvement and the function optimization of the integrated radar system compared with the traditional radar closed development process. The software radar adopts a layered decoupling architecture system, and the research and development mode is a layered parallel behavior concept.
Modern radar systems are increasingly complex and difficult to analyze simply and intuitively, and the simulation of various functions and performances of the systems is completed by means of a computer, and the simulation problem of radar signal processing is lack of application of a digital signal processing theory and an algorithm model because a main mode of modern radar signal processing is a systematic and software processing mode.
In order to solve the above problems, the present application provides a method for processing radar echo signals based on an algorithm model.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a method for processing radar echo signals based on an algorithm model, which has the effects of simple operation steps, high reliability and high processing precision, the radar echo signals can be subjected to deskew processing through the set deskew processing signal model, the radar echo signals are subjected to deskew processing, the sampling rate is reduced, and the simulation problem of radar echo signal processing can be effectively solved by adopting the combination of a digital signal processing theory and the algorithm model.
In order to achieve the purpose, the invention provides the following technical scheme: a method of processing radar echo signals based on an algorithmic model, the method comprising the steps of:
step 1, radar echo signal acquisition and preprocessing: the method comprises the steps that signals transmitted by a radar signal transmitter are reflected by a target, processed through a radar signal receiver, preprocessed through a signal preprocessing module and built into a simulation signal model, wherein the radar echo signals are linear frequency modulation signals;
and 2, extracting, analyzing and deskewing the characteristics of the radar echo signals:
(1) performing analog-to-digital conversion on the received analog signal model in the step 1 to obtain a radar echo signal in a digital form, and extracting the characteristics of the echo signal;
(2) generating a digital reference local oscillator signal, wherein the digital reference local oscillator signal is an ideal linear frequency modulation signal and corresponds to a signal obtained by synchronously sampling an analog reference local oscillator signal and a radar echo signal;
(3) correlating the received radar echo signal with a local oscillator signal with the same scanning speed as the radar echo signal, outputting a difference frequency signal, and establishing a deskew signal model in a time domain;
step 3, establishing an algorithm model to optimize radar echo signals:
(1) aiming at the characteristics of the signal model subjected to the deskew processing in the step 2, establishing a proper algorithm model, and optimizing important parameters of the signal model;
(2) carrying out interference removal processing on the optimized parameters through a signal identification model, and removing random interference signals;
(3) calculating and integrating the signal model after interference removal through the algorithm model to obtain an optimal signal model;
and 4, reconstructing the radar echo signal:
(1) selecting a corresponding signal component which can be used for signal reconstruction according to the central frequency of a signal sent by the radar signal transmitter, and performing signal reconstruction on the optimal signal model in the step 3;
(2) and performing simple filtering processing on the signal obtained by reconstruction, highlighting the essential characteristics of the signal, weakening noise interference and obtaining a final output signal.
Preferably, the signal preprocessing module in step 1 sequentially performs moving average filtering and fourier transform on the radar echo signal, converts the radar echo signal from a time domain to a frequency domain, performs band-pass filtering and inverse fourier transform on the radar echo signal, converts the radar echo signal from the frequency domain to a time domain, and amplifies reflected wave signal components in the radar echo signal to obtain the analog signal model.
Preferably, in the method for processing a radar echo signal based on an algorithm model of the present invention, a sampling rate fs of the analog-to-digital conversion in step 2 satisfies: fs is more than or equal to Bd, wherein: bd represents the bandwidth of the mapping-area signal acquired with analog deskew reception.
Preferably, as a method for processing a radar echo signal based on an algorithm model, the sampling rate of the digital reference local oscillator signal in step 2 is the same as the sampling rate adopted when the radar echo signal is subjected to analog-to-digital conversion, wherein the frequency modulation slope is the same as the frequency modulation slope of the analog reference local oscillator signal.
Preferably, in the signal model for deskewing in step 2, the digital radar echo signal is multiplied by the digital reference local oscillator signal, so as to cancel a secondary phase term of the digital echo signal, where the frequency changes linearly with time, and leave a dot frequency signal only related to the target position, thereby completing deskewing of the radar echo signal.
As a preferable method for processing radar echo signals based on an algorithm model according to the present invention, the important parameters of the signal model in step 3 include a transmitting frequency, an operating wavelength, a transmitting signal bandwidth, a transmitting signal time width, a transmitting pulse repetition period, a transmitting pulse repetition frequency, a sampling frequency, a noise power, a total number of targets existing in a radar detection range, a distance of each target, a speed of each target, a reflection coefficient of each target, and a number of echo pulses of each target.
As a preferred method for processing radar echo signals based on an algorithm model according to the present invention, the algorithm model in step 3 includes, but is not limited to, SAR, ISAR, MTI, or MTD algorithm models.
Preferably, in the method for processing radar echo signals based on an algorithm model of the present invention, the signal filtering process in step 4 uses a gaussian filter to perform the filtering process.
The method for processing radar echo signals based on the algorithm model is preferable, and further comprises a graphic processor for processing radar echo signals and a memory for storing executable instructions of the processor; wherein the graphics processor is configured to execute the instructions.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the radar echo signals can be preprocessed through the signal preprocessing module, so that the interference and clutter of the radar echo signals can be effectively eliminated, a simulation signal model is obtained, and the accuracy of radar echo signal label description is improved;
2. according to the signal model for deskewing, a digital radar echo signal is multiplied by a digital reference local oscillator signal, so that a secondary phase item of frequency linear change along with time in the digital echo signal is offset, a dot frequency signal only related to a target position is left, deskewing of the radar echo signal is completed, and the sampling rate is reduced after deskewing of the radar echo signal;
3. the radar echo signal is optimized by establishing an algorithm model, and the simulation problem of radar echo signal processing can be effectively solved by combining a digital signal processing theory and the algorithm model;
4. the algorithm is optimized in parallel, the algorithm is suitable for the high-speed parallel computing capacity of the graphics processor, the echo computing time of the graphics processor is less than the pulse period along with the increase of the number of sampling points, the number of targets and the number of channels, the real-time requirement of a system can be met, the hardware cost of development is effectively reduced, and the development efficiency is remarkably improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method of processing radar echo signals based on an algorithmic model according to the present invention;
FIG. 2 is a flow chart of a deskew processed signal model of a method of processing radar echo signals based on an algorithmic model of the present invention;
FIG. 3 is a flow chart of radar echo signal optimization for a method of processing radar echo signals based on an algorithmic model of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Please refer to fig. 1-3;
a method of processing radar echo signals based on an algorithmic model, the method comprising the steps of:
step 1, radar echo signal acquisition and preprocessing: the method comprises the steps that signals transmitted by a radar signal transmitter are reflected by a target, processed through a radar signal receiver, preprocessed through a signal preprocessing module and built into a simulation signal model, wherein the radar echo signals are linear frequency modulation signals;
and 2, extracting, analyzing and deskewing the characteristics of the radar echo signals:
(1) performing analog-to-digital conversion on the received analog signal model in the step 1 to obtain a radar echo signal in a digital form, and extracting the characteristics of the echo signal;
(2) generating a digital reference local oscillator signal, wherein the digital reference local oscillator signal is an ideal linear frequency modulation signal and corresponds to a signal obtained by synchronously sampling an analog reference local oscillator signal and a radar echo signal;
(3) correlating the received radar echo signal with a local oscillator signal with the same scanning speed as the radar echo signal, outputting a difference frequency signal, and establishing a deskew signal model in a time domain;
step 3, establishing an algorithm model to optimize radar echo signals:
(1) aiming at the characteristics of the signal model subjected to the deskew processing in the step 2, establishing a proper algorithm model, and optimizing important parameters of the signal model;
(2) carrying out interference removal processing on the optimized parameters through a signal identification model, and removing random interference signals;
(3) calculating and integrating the signal model after interference removal through the algorithm model to obtain an optimal signal model;
and 4, reconstructing the radar echo signal:
(1) selecting a corresponding signal component which can be used for signal reconstruction according to the central frequency of a signal sent by the radar signal transmitter, and performing signal reconstruction on the optimal signal model in the step 3;
(2) and performing simple filtering processing on the signal obtained by reconstruction, highlighting the essential characteristics of the signal, weakening noise interference and obtaining a final output signal.
In an alternative embodiment: the signal preprocessing module in the step 1 sequentially performs moving average filtering and Fourier transform on radar echo signals, converts the radar echo signals from a time domain to a frequency domain, performs band-pass filtering and inverse Fourier transform on the signals, converts the signals from the frequency domain to the time domain, and amplifies reflected wave signal components in the signals to obtain an analog signal model.
In an alternative embodiment: the sampling rate fs of the analog-to-digital conversion in the step 2 meets the following requirements: fs is more than or equal to Bd, wherein: bd represents the bandwidth of the mapping-area signal acquired with analog deskew reception.
In an alternative embodiment: and 2, the sampling rate of the digital reference local oscillator signal in the step 2 is consistent with the sampling rate adopted when the radar echo signal is subjected to analog-to-digital conversion, wherein the frequency modulation slope is consistent with the frequency modulation slope of the used analog reference local oscillator signal.
In an alternative embodiment: in the signal model of the deskew processing in the step 2, the digital radar echo signal is multiplied by the digital reference local oscillator signal, so that a secondary phase item of the digital echo signal, the frequency of which changes linearly with time, is offset, a dot frequency signal only related to the target position is left, and the deskew processing of the radar echo signal is completed.
In an alternative embodiment: important parameters of the signal model in the step 3 include a transmitting frequency, a working wavelength, a transmitting signal bandwidth, a transmitting signal time width, a transmitting pulse repetition period, a transmitting pulse repetition frequency, a sampling frequency, a noise power, a total number of targets existing in a radar detection range, a distance of each target, a speed of each target, a reflection coefficient of each target and a number of echo pulses of each target.
In an alternative embodiment: the algorithm model in step 3 includes but is not limited to SAR, ISAR, MTI or MTD algorithm model.
In an alternative embodiment: and the signal filtering processing in the step 4 adopts a Gaussian filter for filtering processing.
Example 2
Please refer to fig. 1-3; a method of processing radar echo signals based on an algorithmic model, the method comprising the steps of:
step 1, radar echo signal acquisition and preprocessing: the method comprises the steps that signals transmitted by a radar signal transmitter are reflected by a target, processed through a radar signal receiver, preprocessed through a signal preprocessing module and built into a simulation signal model, wherein the radar echo signals are linear frequency modulation signals;
and 2, extracting, analyzing and deskewing the characteristics of the radar echo signals:
(1) performing analog-to-digital conversion on the received analog signal model in the step 1 to obtain a radar echo signal in a digital form, and extracting the characteristics of the echo signal;
(2) generating a digital reference local oscillator signal, wherein the digital reference local oscillator signal is an ideal linear frequency modulation signal and corresponds to a signal obtained by synchronously sampling an analog reference local oscillator signal and a radar echo signal;
(3) correlating the received radar echo signal with a local oscillator signal with the same scanning speed as the radar echo signal, outputting a difference frequency signal, and establishing a deskew signal model in a time domain;
step 3, establishing an algorithm model to optimize radar echo signals:
(1) aiming at the characteristics of the signal model subjected to the deskew processing in the step 2, establishing a proper algorithm model, and optimizing important parameters of the signal model;
(2) carrying out interference removal processing on the optimized parameters through a signal identification model, and removing random interference signals;
(3) calculating and integrating the signal model after interference removal through the algorithm model to obtain an optimal signal model;
and 4, reconstructing the radar echo signal:
(1) selecting a corresponding signal component which can be used for signal reconstruction according to the central frequency of a signal sent by the radar signal transmitter, and performing signal reconstruction on the optimal signal model in the step 3;
(2) and performing simple filtering processing on the signal obtained by reconstruction, highlighting the essential characteristics of the signal, weakening noise interference and obtaining a final output signal.
In an alternative embodiment: on the basis of the embodiment 1, the radar echo signal processing device further comprises a graphics processor for processing a radar echo signal and a memory for storing executable instructions of the processor; wherein the graphics processor is configured to execute the instructions to implement the method for processing the radar echo signal.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for processing radar echo signals based on an algorithmic model, the method comprising the steps of:
step 1, radar echo signal acquisition and preprocessing: the method comprises the steps that signals transmitted by a radar signal transmitter are reflected by a target, processed through a radar signal receiver, preprocessed through a signal preprocessing module and built into a simulation signal model, wherein the radar echo signals are linear frequency modulation signals;
and 2, extracting, analyzing and deskewing the characteristics of the radar echo signals:
(1) performing analog-to-digital conversion on the received analog signal model in the step 1 to obtain a radar echo signal in a digital form, and extracting the characteristics of the echo signal;
(2) generating a digital reference local oscillator signal, wherein the digital reference local oscillator signal is an ideal linear frequency modulation signal and corresponds to a signal obtained by synchronously sampling an analog reference local oscillator signal and a radar echo signal;
(3) correlating the received radar echo signal with a local oscillator signal with the same scanning speed as the radar echo signal, outputting a difference frequency signal, and establishing a deskew signal model in a time domain;
step 3, establishing an algorithm model to optimize radar echo signals:
(1) aiming at the characteristics of the signal model subjected to the deskew processing in the step 2, establishing a proper algorithm model, and optimizing important parameters of the signal model;
(2) carrying out interference removal processing on the optimized parameters through a signal identification model, and removing random interference signals;
(3) calculating and integrating the signal model after interference removal through the algorithm model to obtain an optimal signal model;
and 4, reconstructing the radar echo signal:
(1) selecting a corresponding signal component which can be used for signal reconstruction according to the central frequency of a signal sent by the radar signal transmitter, and performing signal reconstruction on the optimal signal model in the step 3;
(2) and performing simple filtering processing on the signal obtained by reconstruction, highlighting the essential characteristics of the signal, weakening noise interference and obtaining a final output signal.
2. The method according to claim 1, wherein the signal preprocessing module in step 1 comprises sequentially performing moving average filtering and fourier transform on the radar echo signal, converting the radar echo signal from time domain to frequency domain, performing band-pass filtering and inverse fourier transform on the radar echo signal, converting the radar echo signal from frequency domain to time domain, and amplifying reflected wave signal components in the radar echo signal to obtain an analog signal model.
3. The method for processing radar echo signals based on algorithm model according to claim 2, wherein the sampling rate fs of the analog-to-digital conversion in step 2 satisfies: fs is more than or equal to Bd, wherein: bd represents the bandwidth of the mapping-area signal acquired with analog deskew reception.
4. The method according to claim 3, wherein the sampling rate of the reference local oscillator signal in digital form in step 2 is the same as the sampling rate used for analog-to-digital conversion of the radar echo signal, and the chirp rate is the same as the chirp rate of the reference local oscillator signal in analog form.
5. The method according to claim 4, wherein the signal model of the deskew processing in step 2 is implemented by multiplying the digital radar echo signal by the digital reference local oscillator signal, so as to cancel out the quadratic phase term of the digital echo signal whose frequency varies linearly with time, and leave only the dot frequency signal associated with the target position, thereby completing the deskew processing of the radar echo signal.
6. The method of claim 5, wherein the important parameters of the signal model in step 3 include the transmitting frequency, operating wavelength, transmitting signal bandwidth, transmitting signal duration, transmitting pulse repetition period, transmitting pulse repetition frequency, sampling frequency, noise power, total number of targets existing in the radar detection range, distance of each target, speed of each target, reflection coefficient of each target and the number of echo pulses of each target.
7. The method of claim 6, wherein the algorithm model in step 3 comprises but is not limited to SAR, ISAR, MTI or MTD algorithm model.
8. The method of claim 7, wherein the signal filtering process of step 4 is performed by using a Gaussian filter.
9. The method of claim 8, further comprising a graphics processor for processing radar return signals and a memory for storing instructions executable by the processor; wherein the graphics processor is configured to execute the instructions.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116359876A (en) * | 2023-05-30 | 2023-06-30 | 北京立同新元科技有限公司 | Radar signal processing method |
| CN116482631A (en) * | 2023-06-26 | 2023-07-25 | 四川天中星航空科技有限公司 | Target simulation method based on radar echo signals |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116359876A (en) * | 2023-05-30 | 2023-06-30 | 北京立同新元科技有限公司 | Radar signal processing method |
| CN116359876B (en) * | 2023-05-30 | 2023-08-11 | 北京立同新元科技有限公司 | Radar signal processing method |
| CN116482631A (en) * | 2023-06-26 | 2023-07-25 | 四川天中星航空科技有限公司 | Target simulation method based on radar echo signals |
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