CN111142103B - Signal processing method for distance gate crossing problem in ground detection radar - Google Patents
Signal processing method for distance gate crossing problem in ground detection radar Download PDFInfo
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- CN111142103B CN111142103B CN202010104588.0A CN202010104588A CN111142103B CN 111142103 B CN111142103 B CN 111142103B CN 202010104588 A CN202010104588 A CN 202010104588A CN 111142103 B CN111142103 B CN 111142103B
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
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Abstract
The invention discloses a signal processing method aiming at the problem of distance gate crossing in a ground detection radar, which comprises the following steps: the radar transmitting end firstly transmits a point frequency signal, and then transmits a plurality of repeated periods of linear frequency modulation continuous wave signals. The radar receiving end extracts the speed information of the point frequency signal to obtain rough measurement speed information of the target, extracts the range profile of the linear frequency modulation continuous wave signal, performs speed compensation by utilizing the rough measurement speed information of the target, and finally obtains the range profile information without crossing of the range gate. According to the invention, the linear frequency modulation continuous wave signal is subjected to speed compensation, so that the target displacement caused by long-time accumulation is removed, the speed measurement precision and the distance measurement precision of the detected target are ensured, and the method can be used for target detection under the condition of low data rate.
Description
Technical Field
The invention belongs to the field of signal and information processing, and particularly relates to a signal processing method of a ground detection radar aiming at a range gate crossing problem.
Background
The ground detection radar has wide application in application scenes such as border monitoring, key area protection and the like. With the continuous improvement of modern technology, technology and science and technology, the ground detection radar is continuously developed towards miniaturization, low power consumption and low cost. Therefore, when part of the traditional ground detection radars process signals, a long-time accumulation mode is adopted to finish the detection of moving targets so as to meet the requirements of required precision and measurement distance.
At present, when the traditional ground detection radar is accumulated for a long time, the displacement of the target can cause the problem that the detection results of a plurality of repeated periods generate the crossing of a distance gate, and then the moving target detection work cannot be accurately performed. How to solve the problem of distance gate crossing at low speed is a current urgent problem.
Disclosure of Invention
The invention aims to provide a signal processing method aiming at the problem of distance gate crossing in a ground detection radar, which solves the problem of distance gate crossing at a low speed.
The technical solution for realizing the purpose of the invention is as follows: a signal processing method for a range gate crossing problem in a ground detection radar, comprising:
the radar transmitting terminal firstly transmits a point frequency signal, and then transmits a plurality of linear frequency modulation continuous wave signals with repeated periods;
the radar receiving end extracts the speed information of the point frequency signal to obtain rough measurement speed information of the target; and extracting a range profile of the linear frequency modulation continuous wave signal, and performing speed compensation by using rough measurement speed information of the target to finally obtain range profile information without crossing a range gate.
Compared with the prior art, the invention has the remarkable advantages that: (1) According to the invention, through the signal processing of two different emission waveforms of the ground detection radar, the distance information of a target is initially measured, and then the linear frequency modulation continuous wave signal is subjected to speed compensation processing, so that the problem of distance gate crossing under low speed is solved; (2) The invention has the advantages of high accuracy, simple signal processing and the like, and is suitable for ground detection radars under different accuracy requirements by changing the frequency and the duration of the transmitted waveform.
Drawings
FIG. 1 is a flow chart of a signal processing method for a range gate crossing problem in a ground detection radar according to the present invention.
Fig. 2 is a simulation of a set of transmit waveforms of the present invention.
Fig. 3 is a schematic diagram of the result of range profile extraction before speed compensation.
Fig. 4 is a schematic diagram of a velocity compensated range profile extraction result according to the present invention.
Detailed Description
As shown in fig. 1, a signal processing method for a range gate crossing problem in a ground detection radar, where the ground detection radar has two emission waveforms, namely a point frequency continuous wave signal and a multiple complex period linear frequency continuous wave signal, the signal processing method includes the following steps:
the radar transmitting terminal firstly transmits a point frequency signal, and then transmits a plurality of linear frequency modulation continuous wave signals with repeated periods;
the radar receiving end extracts the speed information of the point frequency signal to obtain rough measurement speed information of the target; and extracting a range profile of the linear frequency modulation continuous wave signal, and performing speed compensation by using rough measurement speed information of the target to finally obtain range profile information without crossing a range gate.
The following describes the above steps in detail:
(1) A radar signal transmitting step:
(1a) According to the performance parameters, index requirements and radar signal processing sampling rate of the radar, determining the frequency and duration of the point frequency signal, and transmitting the point frequency signal by using a transmitter;
(1b) And determining the center frequency, the modulation slope, the duration of a single repetition period and the number of repetition periods of the linear frequency modulation continuous wave signal according to the performance parameters and index requirements of the radar and the radar signal processing sampling rate. Transmitting a chirped continuous wave signal using a transmitter;
(2) The radar point frequency signal echo signal processing step comprises the following steps:
(2a) At a radar receiving end, according to the radar point frequency signal echo, completing the extraction of radar point frequency signal echo speed information;
(2b) Aiming at the speed information extraction result, obtaining rough measurement speed information of a radar detection target through constant false alarm detection;
(3) And (3) radar linear frequency modulation continuous wave signal echo signal processing:
(3a) At a radar receiving end, according to the linear frequency modulation continuous wave echo, the distance image extraction of radar linear frequency modulation continuous wave signals in a single repetition period is completed;
(3b) Repeating the step (3 a) until the distance image extraction work is completed on the linear frequency modulation continuous wave signals with all the repeated periods.
(3c) Obtaining a speed compensation signal by using the target speed information obtained by rough measurement in the step (2 b):
wherein m represents the mth signal in a repetition period, n represents the nth signal in the signalSampling point, r (m, n) represents a compensation signal for the nth sampling point of the mth signal in one repetition period, μ represents a chirp rate of the chirped continuous wave, f d Representing Doppler shift of the target, f 0 Represents the equivalent center frequency of the transmitted signal, a represents the acceleration of the target, lambda represents the chirped continuous wave wavelength, f s1 Representing the sampling rate, f, during range profile extraction s2 The sampling rate at the time of moving object detection is represented.
(3d) And (3) multiplying the speed compensation signal obtained in the step (3 b) by the result obtained after the distance image extraction in the step (3 a) to finish the speed compensation of the radar linear frequency modulation continuous wave signal.
Further, in step (1 a), after the frequency of the dot frequency signal is determined, the dot frequency signal is transmitted through the transmitter in the form of a sinusoidal carrier.
Further, the radar point frequency signal echo speed information extraction in the step (2 a) is completed by performing discrete fourier transform according to the total number of radar point frequency signal echo sampling points.
Further, the constant false alarm detection in the step (2 b) adopts ordered statistics constant false alarm detection.
Further, the distance image extraction in the step (3 a) is completed by performing discrete fourier transform on each repetition period according to the period number of the chirped continuous wave and the duration of each repetition period.
The radar range gate crossing problem solving effect can be illustrated by the following simulation experiment:
(1) Simulation conditions: the software used for the simulation was MATLAB.
(2) Simulation environment: the simulation is performed in a Windows 10 environment.
(3) The simulation content:
fig. 2 is a simulation of a set of transmit waveforms of the present invention using Matlab software, with time on the horizontal axis in milliseconds (ms), and frequency on the vertical axis in gigahertz (GHz).
During simulation, the time length of the simulated transmitting point frequency signal is 30ms, and the frequency is 5.6GHz. The simulation uses a single-side frequency linear frequency modulation continuous wave signal, the center frequency is 5.4GHz, the signal bandwidth is 400MHz, the system sampling rate is 2MHz, the duration of each repetition period is 5ms, the number of repetition periods is 16, and the signal-to-noise ratio is-9.070 dB. In order to preserve Doppler information after mixing, 2 points before and after the collected echo signals are discarded, and a 20-order low-pass filter is adopted.
It is simulated that a target is located at 500m of the range radar with a speed of 30m/s (positive in the direction away from the radar), and the radar receiving end performs signal processing on the simulated received echo signal.
(4) Analysis of results
Fig. 3 shows the result of distance image extraction before speed compensation by Matlab software, the horizontal axis is frequency in megahertz (MHz), the vertical axis is amplitude in gigahertz (GHz), and sixteen spectral lines in the figure represent the result of distance image extraction after sixteen repetition periods before speed compensation.
Fig. 4 shows the result of distance image extraction after speed compensation by Matlab software, the horizontal axis is frequency in megahertz (MHz), the vertical axis is amplitude in gigahertz (GHz), and sixteen spectral lines in the figure represent the result of distance image extraction after sixteen repetition periods after speed compensation.
As can be seen from fig. 3 and fig. 4, before the speed compensation is not performed, the distance image is extracted, and the distance image has no distance gate crossing problem after the speed compensation is performed, which indicates that the invention can solve the radar distance gate crossing problem at low speed.
Claims (3)
1. A signal processing method for a range gate crossing problem in a ground detection radar, comprising:
the radar transmitting terminal firstly transmits a point frequency signal, and then transmits a plurality of linear frequency modulation continuous wave signals with repeated periods;
the radar receiving end extracts the speed information of the point frequency signal to obtain rough measurement speed information of the target; extracting a range profile of the linear frequency modulation continuous wave signal, performing speed compensation by using rough measurement speed information of a target, and finally obtaining range profile information without crossing a range gate;
the radar point frequency signal echo signal processing method comprises the following steps:
(2a) At a radar receiving end, according to the radar point frequency signal echo, completing the extraction of radar point frequency signal echo speed information;
(2b) Aiming at the speed information extraction result, obtaining rough measurement speed information of a radar detection target through constant false alarm detection;
extracting radar point frequency signal echo speed information in the step (2 a), and performing discrete Fourier transform according to the total number of radar point frequency signal echo sampling points to finish the step;
the constant false alarm detection in the step (2 b) adopts ordered statistics constant false alarm detection;
the method for processing the radar linear frequency modulation continuous wave signal echo signal comprises the following steps:
(3a) At a radar receiving end, according to the linear frequency modulation continuous wave signal echo, the distance image extraction of the radar linear frequency modulation continuous wave signal in a single repetition period is completed;
(3b) Repeating the step (3 a) until the linear frequency modulation continuous wave signals with all the repeated periods finish the distance image extraction work;
(3c) Obtaining a speed compensation signal by using the target speed information obtained by rough measurement in the step (2 b):
wherein m represents an mth signal in one repetition period, n represents an nth sampling point in the signal, r (m, n) represents a compensation signal for the nth sampling point of the mth signal in one repetition period, μ represents a chirp rate of the chirped continuous wave, f d Representing Doppler shift of the target, f 0 Represents the equivalent center frequency of the transmitted signal, a represents the acceleration of the target, λ represents the wavelength, f s1 Representing the sampling rate, f, during range profile extraction s2 Representing the sampling rate at the time of moving object detection;
(3d) Multiplying the speed compensation signal obtained in the step (3 c) by the result obtained after the distance image extraction in the step (3 a) to finish the speed compensation of the radar linear frequency modulation continuous wave signal;
the distance image extraction in the step (3 a) is completed by performing discrete fourier transform on each repetition period according to the period number of the chirp continuous wave and the duration of each repetition period.
2. The signal processing method for the range gate crossing problem in the ground detection radar according to claim 1, wherein the specific method for the radar transmitting end to transmit the radar signal is as follows:
(1a) According to the performance parameters and index requirements of the radar, determining the frequency and the duration of the point frequency signal, and transmitting the point frequency signal by using a transmitter;
(1b) According to the performance parameters and index requirements of the radar, determining the center frequency, the modulation slope, the single repetition period duration and the repetition period number of the linear frequency modulation continuous wave signal; a chirped continuous wave signal is transmitted with a transmitter.
3. The method of claim 2, wherein the point frequency signal is transmitted by the transmitter in the form of a sinusoidal carrier.
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| CN106597427A (en) * | 2016-11-22 | 2017-04-26 | 上海无线电设备研究所 | Ultra-high-speed target detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106597427A (en) * | 2016-11-22 | 2017-04-26 | 上海无线电设备研究所 | Ultra-high-speed target detection method |
Non-Patent Citations (3)
| Title |
|---|
| 肖慧 ; 胡卫东 ; 郁文贤 ; .基于直接相位差分的LFMCW雷达加速运动目标参数估计.信号处理.2009,25(4),全文. * |
| 肖慧 等.基于局部补偿的LFMCW雷达速度-加速度模板匹配法.《信号处理》.2009,第25卷(第25期),第735-740页. * |
| 马可.主动防护系统探测雷达的高速多目标配对.《兵器装备工程学报》.2016,第37卷(第37期),第122-126页. * |
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