Unmanned area target detection method

Abstract

The invention provides an unmanned area target detection method. The unmanned area target detection method comprises the following steps: carrying out AD sampling on echo signals, wherein the echo signals are reflection signals of detection wave signals sent by a detection radar after the detection wave signals reach targets; carrying out range-direction Fourier transform on the sampled signals to obtain a single repetition-frequency one-dimensional range image; carrying out MTI filtering on a plurality of repetition-frequency one-dimensional range images; carrying out non-phase-coherent accumulation on filtered data to obtain non-phase-coherent accumulation results of the echo signals; and carrying out constant false-alarm rate detection on the non-phase-coherent accumulation results of the echo signals and judging whether the targets exist in a detected area. The unmanned area target detection method adopts a dual-delay-line canceller, so that the inhibition capability on zero-frequency clutters can be effectively improved; through the adoption of the azimuth-direction non- phase-coherent accumulation, the azimuth-direction spectral dispersion effect is effectively avoided; in addition, the zero-frequency resolution ratio and the signal-to-clutter ratio of an azimuth Doppler can be further improved by increasing MTI filtering points and non-phase-coherent accumulation points.

Description

technical field [0001] The invention relates to the technical field of continuous wave radar target detection, in particular to a method for detecting targets in uninhabited areas. Background technique [0002] Chirp continuous wave radar has high range resolution, simple structure, small size, light weight and good low intercept probability characteristics, and has been widely used in the field of intelligent monitoring. The target detection technology of chirp continuous wave radar is of vital significance in the intelligent monitoring system of unattended occasions or uninhabited restricted areas, and directly determines the safety performance of the monitoring system. [0003] In order to ensure a low intercept probability of the radar, the accumulation points of the linear frequency modulation continuous wave radar in the azimuth direction are generally more. Especially in the intelligent monitoring system, the power of the transmitter is low, and the resolution of the...

AI Technical Summary

Problems solved by technology

However, the detection radar currently used in intelligent monitoring systems generally adopts a fixed target detection threshold, which is difficult to guarantee the anti-false alarm capability of the radar, and also limits the low interception performance of the radar to a certain extent.

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