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A high-precision slope monitoring radar target detection and ranging method

A radar target and ranging method technology, applied in measurement devices, radio wave measurement systems, instruments, etc., can solve problems such as spectrum leakage, image frequency interference, and system complexity, reduce equipment complexity and cost, and eliminate image frequency. Interfere, avoid the effect of setting thresholds

Active Publication Date: 2022-08-05
HUNAN ZHONGDA CONSTR ENG TESTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the general LFM continuous wave radar also needs to process the intermediate frequency signal, resulting in a complex system and more hardware, and also uses digital IQ demodulation, which may cause inconsistency in the amplitude and phase of the IQ two channels, resulting in image frequency In addition, the finite FFT transform will produce spectrum leakage. For high-precision slope ranging, the frequency value extracted by the FFT algorithm is easy to deviate from the real frequency value, which will cause large errors and cause large false alarms; in addition, conventional In the constant false alarm detection method, it is necessary to set the threshold of the signal power for target detection. The threshold needs to be modified according to the change of the signal-to-clutter ratio of each measurement, which makes the slope monitoring work more cumbersome.

Method used

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  • A high-precision slope monitoring radar target detection and ranging method
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  • A high-precision slope monitoring radar target detection and ranging method

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Experimental program
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Effect test

Embodiment 1

[0081] with f 0=12GHz, τ=1ms (transmission signal pulse width), B=500MHz, when the measurement target is 1678.9m, the simulation calculation is carried out according to the method of the present invention, and the results of each node are as follows Figure 5-Figure 11 shown,:

[0082] from Figure 9 It can be seen that the traditional FFT causes spectrum leakage due to signal truncation, while the full-phase FFT supplements the breakpoint data and better maintains the continuity of the signal, thereby effectively suppressing spectrum leakage. from Figure 11 It can be seen that after the refinement of the CZT algorithm, the spectral envelope is more specific, the spectral resolution is increased, and the spectral peak points can be better found.

Embodiment 2

[0084] with f 0 =12GHz, B=500MHz, τ=1ms, when the measurement target is 1200m and 2738m, the results of each node are as follows Figure 12-Figure 18 It can be seen from the comparison of FFT and CZT spectrum refinement diagrams that after spectrum refinement, the envelope is more complete, and the output one-dimensional range image is output as the result of the ranging target.

[0085] Furthermore, from Figure 16 The left and right images of the sampled signal spectrum and Figure 18 Comparing the upper and lower images of the CZT, the effect of CZT spectrum refinement can be clearly seen. The two frequency points are refined around the two frequency points, showing an obvious envelope and increasing the frequency resolution.

Embodiment 3

[0087] with f 0 =12GHz, B=500MHz, when the measurement target is 125.2m, 1234.5m, 2678.8m, the results of each node are as follows Figure 19-Figure 25 As shown, the detection algorithm loops the amplitude of each frequency point, normalizes the amplitude of the echo signal after FFT, and further controls the threshold range.

[0088] Figure 20 is the echo signal spectrum, which is added for each target echo signal. Since there are 3 targets, 3 peak frequency points are displayed on each spectrogram. from Figure 23 It can be clearly seen from the comparison diagram that the all-phase fft suppresses the spectral leakage performance. Figure 25 The one-dimensional distance image of the target is the final output.

[0089] It can be seen from the above that the target detection and ranging method of the present invention can reduce a low-frequency amplification and data acquisition channel while satisfying the slope monitoring function within 5KM, reduce the amount of equi...

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Abstract

The invention discloses a high-precision slope monitoring radar target detection and ranging method. The method inputs the received signal reflected by the slope into a mixer, and the output end of the mixer is connected to the input of a low-pass filter. end, the output end of the low-pass filter is connected to the input end of the A / D sampling module, and for the digital signal at the output end of the A / D sampling module, the full-phase FFT algorithm is used first to obtain the signal spectrum without leakage, and through two The high-level detection algorithm accurately detects the spectrum peak points, and uses the CZT algorithm to refine the spectrum near the spectrum peak points to measure the high-precision value of the peak frequency points. According to the relationship between the frequency and the distance of the chirp continuous wave beat frequency signal, The target distance can be obtained from the exact value of the peak frequency point. The method of the invention can avoid image frequency interference, optimize frequency estimation, reduce the false alarm probability of target detection, improve the measurement accuracy of the short-range slope radar, and reduce the system complexity and hardware cost.

Description

technical field [0001] The invention belongs to the technical field of radar monitoring, and in particular relates to a high-precision slope monitoring radar target detection and ranging method. Background technique [0002] my country is an area prone to geological disasters. According to incomplete statistics, more than 50% of the hidden danger points of geological disasters in my country are landslide hidden danger points. As a kind of geological disaster, the slope landslide has the characteristics of slow formation, sudden occurrence and strong destructiveness. Therefore, it is difficult for the masses to predict the geological disaster and landslide monitoring methods. Therefore, high-precision slope monitoring radar is of great significance for monitoring landslides. Therefore, the product has broad application prospects in the field of domestic geological disaster monitoring and prevention. [0003] The general slope monitoring radar adopts the linear frequency modu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/08G01S13/88G01S7/41G01S7/36G06F17/14
CPCG01S13/08G01S13/88G01S7/414G01S7/36G06F17/14
Inventor 李春苗尹小波罗治郭棋武湛永坚曹毅强孔德君王峰毕晓猛雷彬
Owner HUNAN ZHONGDA CONSTR ENG TESTING TECH
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