Multi-target number detection method and device based on frequency-modulated continuous wave radar

Abstract

The invention relates to the field of target detection based on a frequency-modulated continuous wave radar, and particularly belongs to a multi-target number detection method and device based on thefrequency-modulated continuous wave radar. The method comprises the steps that the frequency-modulated continuous wave radar transmits a linear frequency-modulated signal, and the received echo signaland the transmitted linear frequency-modulated signal are mixed; the mixing signal are filtered and discretized to obtain a discrete intermediate frequency signal containing distance and speed information of a plurality of to-be-measured targets; windowing processing is performed on the discrete intermediate frequency signal; two-dimensional fast Fourier transform is performed on the windowed discrete intermediate frequency signal to obtain two-dimensional amplitude spectrum information; a two-dimensional combined adaptive constant false alarm rate algorithm is adopted to perform preliminaryestimation on the number of to-be-measured targets, and a two-dimensional spectrum peak is updated; and based on the two-dimensional spectrum peak, final estimation is performed on the number of the to-be-measured targets by adopting multi-scatter target condensation processing, thereby determining the number of the targets. According to the invention, the detection performance is effectively improved under the condition of relatively low time cost.

Description

technical field [0001] The present invention relates to the field of target detection based on frequency modulated continuous wave radar (Frequency Modulated Continuous Wave Radar, FMCW), in particular to a FMCW radar target number based on two-dimensional combined constant false alarm rate processing (constant false alarm rate, CFAR) and agglomeration processing Detection method and device. Background technique [0002] Radar can work around the clock and is not affected by factors such as light and weather, so it has been widely used in the military field. By radiating electromagnetic waves into space and detecting the echo reflected by the target, information such as the distance of the target can be obtained. The frequency modulated continuous wave (Frequency Modulated Continuous Wave, FMCW) radar has the advantages of easy implementation in hardware, simple structure, small size, light weight and low cost. In terms of performance, it has the advantages of high distanc...

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Problems solved by technology

However, these two types of algorithms have their own defects. The method based on the mean class is only suitable for scenes with relatively uniform clutter distribution, while the detection method based on the statistical ordered class can effectively detect clutter in a non-uniform clutter environment. goal, but this method has high computational complexity due to the need to sort all reference cells

At the same time, these two types of algorithms are prone to the problem of estimating multiple target objects for the same target in the presence of multi-scattering point targets, and the number of targets is unclear, resulting in a decrease in target detection performance.

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