A Human Detection Method Combining Frequency-Domain Clutter Image Detection and High-Low Frequency Energy Ratio
A technology of human body detection and high-frequency energy, applied in the field of human body detection, can solve the problems of intertwining, elevated background level of human body echo signal spectrum, target detection algorithm failure, etc., to achieve the effect of effective detection
Active Publication Date: 2016-09-14
WUHAN BINHU ELECTRONICS
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[0006] The conventional moving target detection algorithm has a large notch near the zero frequency. When the DC component is canceled, the useful human body echo signal is also canceled; or due to the inherent characteristics of the filter, the DC component and the The human body echo signals are intertwined with each other, and the background level near the frequency spectrum of the useful human body echo signal is raised, causing the conventional target detection algorithm to fail
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[0025] 1. Steps to create frequency domain clutter map:
[0026] 1.1 Doppler filter;
[0027] First, the radar echo baseband signal is processed by DC signal elimination, and then Chebyshev weighted FFT is performed. Doppler filter expression where N=1024.
[0028] In this embodiment, radar target echo collection data is used for analysis, and the FFT analysis results are shown in figure 2 , 3 :
[0029] 1.2 Frequency domain clutter map update and storage;
[0030] Frequency-domain clutter map technology is to divide the echo signal spectrum within the radar scanning range into multiple frequency-domain clutter units in the frequency domain, such as figure 1 . When the frequency domain clutter map is established, each frequency domain clutter unit stores the average clutter power value of multiple frequency domain resolution units corresponding to the frequency domain clutter unit. When the frequency domain clutter unit is updated, the new The clutter power value Y(n...
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The invention relates to the field of human body detection, in particular to a human body detection method combining frequency domain clutter map detection with a high and low frequency energy ratio. The method sequentially comprises building of a frequency domain clutter map, the frequency domain clutter map detection and the high and low frequency energy ratio, wherein the building of the frequency domain clutter map comprises the steps of Doppler filtering and updating and storing of the frequency domain clutter map; the frequency domain clutter map detection comprises the step that human body detection is carried out according to the judgment threshold determined by the ambient level of the frequency domain clutter map; the high and low frequency energy ratio is used for carrying out human body detection according to difference of high frequency energy and low frequency energy in echo; the frequency domain clutter map detection is used for indoor dynamic human body detection; the high and low frequency energy ratio is used for indoor static human body detection. The human body detection method combining frequency domain clutter map detection with the high and low frequency energy ratio has good human body detection performance and popularization capacity, and can be widely applied to the technical fields such as personnel detection in anti-terrorist and street fighting secrete chambers and seismic casualty search and rescue.
Description
technical field [0001] The invention relates to the field of human body detection, in particular to a human body detection method combining frequency domain clutter pattern detection and high-low frequency energy ratio. Background technique [0002] The partition wall detection radar is a personnel indicating radar, which is used for human detection in secret rooms and provides decision-making basis for decision-makers. [0003] The radar uses a continuous wave system to meet the low power consumption requirements of the radar, and uses zero-IF receiver technology to reduce the AD sampling rate. When the partition wall detection radar is working, the transmitting antenna radiates a single-point frequency sinusoidal signal, and receives the radar echo signal through the receiving antenna. The radar echo signal is directly converted to the baseband after a down-conversion, and then the useful signal in the baseband is extracted through a low-pass filter. [0004] Everything ...
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IPC IPC(8): G01S13/88
CPCG01S13/888
Inventor 郑志成韩喆黄志华徐敏超董铮马俊杰余洋
Owner WUHAN BINHU ELECTRONICS