Continuous wave radar multi-dimensional resolution velocity measurement method

Abstract

The invention discloses a continuous wave radar multi-dimensional resolution velocity measurement method, and belongs to the field of radio radar detection. According to the invention, pseudo-random code sequences with different parameters are subjected to composite processing to obtain composite pseudo-code signals. And transmitting through a transmitting antenna of the speed measuring radar, and then carrying out digital correlation demodulation, fast short-time Fourier transform, target detection and data fusion on echo signals received by a receiving antenna of the speed measuring radar in real time to complete the target speed and change rate information of the high-speed group target. The method provided by the invention can effectively solve the problems of large speed dynamic range, low speed measurement precision, low target resolution and the like in high-speed group target speed measurement, improves the high-speed group target speed measurement precision and the multi-target resolution capability, and improves the efficiency evaluation performance; the method has the advantages of being simple in algorithm, good in reliability, stable in performance, high in measurement precision and the like, and is suitable for long-distance high-precision measurement of the high-speed group target speed.

Description

Technical Field

[0001] The invention relates to the field of radio radar detection, in particular to a continuous wave radar multi-dimensional resolution velocity measurement method. Background Art

[0002] At present, the methods used for high-speed group target measurement mainly include zone interception method, high-speed photography method and radar measurement method. When the zone interception method is used for high-speed group target measurement, there are problems such as difficulty in arranging the zone interception device, low acceptance rate of test results, and difficulty in meeting the requirements of high-speed group target measurement. The high-speed photography method has the problem that there are a large number of high-speed group targets, the movement speed is fast, and the targets are difficult to distinguish. In principle, radar measurement method is the first choice for high-speed group target measurement, but due to the large number of high-speed group targets, short effective measurement time, wide speed distribution, and single parameter measurement cannot take into account both high distance resolution and high speed resolution, it is difficult to improve the speed measurement accuracy. Summary of the invention

[0003] In view of this, the present invention proposes a continuous wave radar multi-dimensional resolution speed measurement method. The present invention provides accurate distance, speed, quantity and other information of high-speed group targets, which can effectively improve the measurement accuracy of the radar and play a very important role in multi-target resolution and target track formation.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A continuous wave radar multi-dimensional resolution velocity measurement method comprises the following steps:

[0006] Step 1, start measuring and start the speed measuring radar;

[0007] Step 2: after the speed measuring radar is started, a pseudo-random code sequence with different parameters is generated, and the pseudo-random code sequences with different parameters are composited to obtain a composite pseudo-code signal; and the composite pseudo-code signal is transmitted from the transmitting antenna of the speed measuring radar;

[0008] Step 3, the receiving antenna of the speed measuring radar receives the echo signal in real time, the echo signal is first amplified by a low noise amplifier, and then transformed into a video signal through orthogonal mixing, filtering amplification and orthogonal detection; the echo signal is a composite pseudo code signal reflected by a high-speed group target;

[0009] Step 4, digitally sampling the video signal to obtain a digital echo signal, performing correlation demodulation processing on the digital echo signal to obtain the distance information between the high-speed group target and the speed measuring radar corresponding to different parameters, and performing short-time Fourier transform on the correlated demodulated signal to obtain the movement speed of the high-speed group target relative to the speed measuring radar corresponding to different parameters;

[0010] Step 5, data fusion is performed on the distance between the same high-speed target and the speed measuring radar and the moving speed relative to the speed measuring radar obtained under different parameters to obtain the accurate distance and moving speed between the same high-speed target and the speed measuring radar.

[0011] Furthermore, in step 2, the pseudo-random code sequences with different parameters are composited to obtain the composite pseudo-random code signal in the following specific manner: the speed measuring radar performs carrier modulation on different pseudo-random code sequences respectively to obtain multiple pseudo-random signals, and the multiple pseudo-random signals are summed to obtain the composite pseudo-random code signal.

[0012] Furthermore, the specific method of step 4 is as follows: the video signal is divided into two paths, correlated with different range code clocks, and filtered to obtain the corresponding range gate echo information; each range gate information is individually subjected to time-frequency analysis processing to obtain the time Doppler energy information of each range gate; the number of targets and their speeds of each range gate are obtained by performing constant false alarm threshold processing and target detection on the range gate information.

[0013] Furthermore, the specific method of step 5 is: by performing target association matching and speed time fusion on multiple range gate detection data, finding relevant points and fitting the target motion speed trajectory, thereby obtaining the target speed and its change rate information.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the present invention compared with the prior art are:

[0015] Aiming at the speed measurement of high-speed group targets, the present invention carries out correlation demodulation, time-frequency analysis and target detection and other processing on the video echo signal based on the target multi-dimensional resolution and trajectory fitting technology of pseudo code ranging, separates the targets by using the target multi-dimensional information, and then carries out target association, information fusion, trajectory fitting and other processing to obtain the target speed information. The present invention has the characteristics of high distance and speed resolution, strong algorithm robustness, high measurement accuracy and the like, can effectively improve the resolution and speed measurement accuracy of high-speed group targets, and provide a basis for the initial speed measurement and performance evaluation of high-speed group targets. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a flow chart of a method for multi-dimensional resolution velocity measurement of a continuous wave radar in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] A continuous wave radar multi-dimensional resolution velocity measurement method, such as Figure 1 As shown, the following steps are included:

[0019] Step 1, start measuring and start the speed measuring radar;

[0020] Step 2: after the speed measuring radar is started, a pseudo-random code sequence with different parameters is generated, and the pseudo-random code sequences with different parameters are composited to obtain a composite pseudo-code signal; and the composite pseudo-code signal is transmitted from the transmitting antenna of the speed measuring radar;

[0021] Step 3, the receiving antenna of the speed measuring radar receives the echo signal in real time, the echo signal is first amplified by a low noise amplifier, and then transformed into a video signal through orthogonal mixing, filtering amplification and orthogonal detection; the echo signal is a composite pseudo code signal reflected by a high-speed group target;

[0022] Step 4, digitally sampling the video signal to obtain a digital echo signal, performing correlation demodulation processing on the digital echo signal to obtain the distance information between the high-speed group target and the speed measuring radar corresponding to different parameters, and performing short-time Fourier transform on the correlated demodulated signal to obtain the movement speed of the high-speed group target relative to the speed measuring radar corresponding to different parameters;

[0023] Step 5: Data fusion is performed on the distance between the same high-speed target and the speed measuring radar and the speed of movement relative to the speed measuring radar obtained under different parameters to obtain the accurate distance and speed of movement between the same high-speed target and the speed measuring radar, and finally package and report;

[0024] Furthermore, in step 2, the pseudo-random code sequences with different parameters are composited to obtain the composite pseudo-random code signal in the following specific manner: the speed measuring radar performs carrier modulation on different pseudo-random code sequences respectively to obtain multiple pseudo-random signals, and the multiple pseudo-random signals are summed to obtain the composite pseudo-random code signal.

[0025] Furthermore, the specific method of step 4 is as follows: the video signal is divided into two paths, correlated with different range code clocks, and filtered to obtain the corresponding range gate echo information; each range gate information is individually subjected to time-frequency analysis processing to obtain the time Doppler energy information of each range gate; the number of targets and their speeds of each range gate are obtained by performing constant false alarm threshold processing and target detection on the range gate information.

[0026] Furthermore, the specific method of step 5 is: by performing target association matching and speed time fusion on multiple range gate detection data, finding relevant points and fitting the target motion speed trajectory, thereby obtaining the target speed and its change rate information.

[0027] Working principle of the present invention:

[0028] The main working process of the present invention is that the signal generating unit generates a composite pseudo-random continuous wave signal, and the signal is transmitted through the antenna after frequency conversion. After the antenna receives the target echo signal, it is first converted into a video signal by the coherent local oscillator, and multi-channel correlation is performed. If the echo signal carries a certain delayed moving target information, the corresponding Doppler signal will be obtained after correlation with a certain correlator. After FFT digital filtering, target detection and parameter solution, the distance and frequency information of the target can be obtained. The echo signal is correlated and demodulated and Doppler information is processed using pseudo-code continuous wave signals with different parameters to obtain the distance and speed information of the target under different parameters. In order to improve the measurement accuracy, the target measurement values ​​under different parameters are paired, and the measurement values ​​are fused, which can effectively improve the speed measurement accuracy and thus improve the performance evaluation effect.

[0029] In summary, the present invention provides accurate information such as distance, speed, and quantity of high-speed group targets, which can effectively improve the measurement accuracy of radar and plays a very important role in multi-target resolution and target track formation.

[0030] Those skilled in the art will appreciate that the embodiments described are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to the embodiments described. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A continuous wave radar multi-dimensional resolution velocity measurement method, characterized in that: The steps include: Step 1, start measuring and start the speed measuring radar; Step 2: after the speed measuring radar is started, a pseudo-random code sequence with different parameters is generated, and the pseudo-random code sequences with different parameters are composited to obtain a composite pseudo-code signal; and the composite pseudo-code signal is transmitted from the transmitting antenna of the speed measuring radar; Step 3, the receiving antenna of the speed measuring radar receives the echo signal in real time, the echo signal is first amplified by a low noise amplifier, and then transformed into a video signal through orthogonal mixing, filtering amplification and orthogonal detection; the echo signal is a composite pseudo code signal reflected by a high-speed group target; Step 4, digitally sampling the video signal to obtain a digital echo signal, performing correlation demodulation processing on the digital echo signal to obtain the distance information between the high-speed group target and the speed measuring radar corresponding to different parameters, and performing short-time Fourier transform on the correlated demodulated signal to obtain the movement speed of the high-speed group target relative to the speed measuring radar corresponding to different parameters; Step 5, data fusion is performed on the distance between the same high-speed target and the speed measuring radar and the moving speed relative to the speed measuring radar obtained under different parameters to obtain the accurate distance and moving speed between the same high-speed target and the speed measuring radar.

2. The method for measuring velocity using a continuous wave radar with multi-dimensional resolution according to claim 1, characterized in that: In step 2, the pseudo-random code sequences with different parameters are composited to obtain the composite pseudo-random code signal in the following specific manner: the speed measuring radar performs carrier modulation on different pseudo-random code sequences respectively to obtain multiple pseudo-random signals, and the multiple pseudo-random signals are summed to obtain the composite pseudo-random code signal.

3. The method for measuring velocity using continuous wave radar with multi-dimensional resolution according to claim 2, characterized in that: The specific method of step 4 is as follows: the video signal is divided into two paths, correlated with different range code clocks, and filtered to obtain the corresponding range gate echo information; each range gate information is subjected to time-frequency analysis processing to obtain the time Doppler energy information of each range gate; the number of targets and their speeds of each range gate are obtained by performing constant false alarm threshold processing and target detection on the range gate information.

4. The method for measuring velocity using continuous wave radar with multi-dimensional resolution according to claim 3, characterized in that: The specific method of step 5 is: by performing target association matching and speed-time fusion on multiple range gate detection data, finding relevant points and fitting the target motion speed trajectory, thereby obtaining the target speed and its change rate information.

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