Signal processing method and system of microwave micro-motion sensor, and related component

Abstract

The invention discloses a signal processing method and system of a microwave micro-motion sensor, and a related component. The signal processing method comprises the following steps: acquiring an initial digital signal corresponding to a transmitting signal; performing wavelet decomposition on the initial digital signal to obtain a plurality of decomposed components, removing the decomposed components corresponding to the interference signal from all the decomposed components, and performing reconstruction by using the remaining decomposed components to obtain a reconstructed signal; performing FFT operation on the reconstructed signal to obtain an FFT operation result; obtaining a plurality of complex numbers in one-to-one correspondence with the plurality of preset FFT indexes from the FFT operation result by using a multi-channel complex number band-pass filter; and judging whether a complex number exceeds a corresponding threshold value, and if so, judging that the life body exists in the current detection range. The interference variable of the initial digital signal is removed through wavelet decomposition, subsequent calculation is carried out on the obtained reconstructed signal, the influence of the interference signal is avoided, and the detection of whether the life body exists in the current detection range is more accurate.

Description

technical field [0001] The invention relates to the field of microwave micro-motion sensors, in particular to a signal processing method, system and related components of microwave micro-motion sensors. Background technique [0002] Compared with the traditional pyroelectric infrared detection technology, microwave detection technology has the advantages of concealed installation and no influence of ambient temperature, so it is widely used in all walks of life, mainly used to detect whether there are people in the area, and then realize the induction light, sensing area Whether it is occupied or not. [0003] When selecting the frequency, considering that the lower the frequency, the signal is less likely to be reflected, and the higher the frequency, the higher the requirements for the manufacturing process of the equipment. Therefore, 5.725GHz to 5.875GHz is usually selected as the frequency range of microwave detection. [0004] However, this frequency is similar to the...

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Problems solved by technology

[0004] However, this frequency is similar to the frequency of the WiFi signal, and they affect each other when they coexist. If microwave detection is applied in the WiFi environment, the detection results will be interfered by the WiFi signal, and the accuracy of the detection results will be reduced.

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