Doppler through-wall radar locating method based on energy operator

Abstract

The invention belongs to the technical field of target tracking, and discloses a Doppler through-wall radar locating method based on an energy operator. The Doppler through-wall radar locating methodincludes an energy operator frequency estimating algorithm and a locating and tracking algorithm. The energy operator frequency estimating algorithm is used to extract a target component of interest in the received echo and estimate the instantaneous frequency feature value of the target component. The locating and tracking algorithm is used to track and locate the target component in real time according to a target frequency. High precision can be ensured and multiple targets can be simultaneously located without constructing a large transceiver antenna array. The cost of the system can be reduced, the size of radar can be reduced, and the power of the battery can be saved. Moreover, complicated multi-channel data fusion can be avoided, and the complexity of signal processing can be reduced. The method has a wide application prospect in the field of real-time detection of Doppler through-wall radar.

Description

technical field [0001] The invention belongs to the technical field of target tracking, in particular to an energy operator-based Doppler through-wall radar positioning method. Background technique [0002] In recent years, the use of Doppler through-the-wall radar to track human targets has been regarded as a powerful tool with broad application prospects in military and civilian fields. Early research results show that in order to locate a moving target, accurate estimation of the target's instantaneous frequency plays an important role. So far, the most popular algorithm for instantaneous frequency estimation of Doppler through-wall radar is based on short-time Fourier transform (STFT). However, this type of approach has several major drawbacks. First, due to the particularity of the application of through-wall radar, most observers often hope to obtain the detection information of the target in real time. However, when using the STFT algorithm to process signals, ther...

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Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the current method to improve the estimation performance of target instantaneous frequency is mainly to increase the antenna to obtain more signal features, which leads to large size, heavy weight and high cost of the radar, which is not suitable for wearing. The portability and economy of the wall radar; at the same time, the time-frequency analysis technology will be compromised by the time and frequency resolution, resulting in a decrease in the estimation accuracy of the frequency; in addition, when the instantaneous frequencies of different targets are similar, the separation algorithm is prone to failure The problem of modal aliasing causes the estimation accuracy of instantaneous frequency to decrease or even misjudgment; finally, a large number of Fourier transforms and high-order exponents will increase the computational complexity

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