MIMO radar target positioning method and system based on space-time coding

Abstract

The invention discloses an MIMO radar target positioning method and system based on space-time coding, and belongs to the field of target detection and positioning, wherein the method comprises the steps: modulating the initial phase of linear frequency modulation signals through a space-time block code, transmitting the linear frequency modulation signals, and receiving the signals through receiving antennas after the signals are reflected by a target object; performing frequency mixing on the signals received by all the receiving antennas and the signal transmitted by the first transmitting antenna to obtain baseband signals, and performing sampling, extraction recombination and space-time decoding on the baseband signals in sequence to obtain corresponding decoded signals; combining the decoded signals to construct space-time two-dimensional virtual array signals, and sequentially performing two-dimensional smoothing and combination on the space-time two-dimensional virtual array signals to obtain space-time combined virtual sub-array signals; constructing a spectral function of the space-time joint virtual sub-array signals; and calculating the maximum value of the spectral function, and positioning the target object according to the distance and azimuth angle corresponding to the maximum value. The angle estimation precision can be improved, a clutter background is cleaner, target detection is facilitated, and the positioning precision is improved.

Description

technical field [0001] The invention belongs to the field of target detection and positioning, and more particularly relates to a space-time coding-based MIMO radar target positioning method and system. Background technique [0002] Multi-target positioning technology has a wide range of applications, such as smart transportation, indoor positioning, etc. Compared with infrared, laser, ultrasonic and other detection technologies, radar is almost not affected by the weather, has the characteristics of all-weather and all-weather, and has certain penetration capabilities. In scenes with low visibility such as fire scenes and foggy weather, the radar also has stable multi-target positioning performance. [0003] Multiple-input-multiple-out (MIMO) radar is a multi-antenna combined transceiver system. Technologies such as waveform diversity, space diversity and time diversity enable it to have high resolution, flexible beam design, anti-target scintillation and anti-jamming, etc...

AI Technical Summary

Problems solved by technology

Generally speaking, MIMO radar requires that the transmitted waveforms are mutually orthogonal and have good autocorrelation and cross-correlation characteristics, but it is not easy to design multiple waveforms that meet this condition

The existing MIMO radar positioning technology generally designs better orthogonal waveforms to meet the positioning requirements through special methods, but such methods are complex and require a lot of hardware resources; in

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