Target detection method and device

Abstract

An embodiment of the invention provides a target detection method and device. The method includes the steps of: forming a distance Doppler two-dimensional plane; for each Doppler channel of the distance Doppler two-dimensional plane, determining a detected distance unit; determining initial reference windows of a constant false alarm left window located at the left side of the detected distance unit, and determining initial reference windows of a constant false alarm right window at the right side; determining an amplitude average value of the initial reference windows of the constant false alarm left window, determining an amplitude average value of the initial reference windows of the constant false alarm right window, selecting the larger amplitude average value as a target amplitude average value, and multiplying the target amplitude average value by a set fast multiplying factor, thereby obtaining a judgment threshold value; and if the amplitude value of the detected distance unit is larger than the judgment threshold value, determining that a target exists in the detected distance unit. The target detection method provided by the embodiment of the invention can control the false alarm probability, thereby improving target detection performance.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a target detection method and device. Background technique [0002] When detecting targets through radar, it is necessary to control the false alarm probability at a low level. The false alarm probability means that when the amplitude of the noise signal exceeds the detection threshold, the radar will mistakenly believe that the target is found. This error is called a false alarm. Probability is false alarm probability; in order to realize the control of false alarm probability, there are many processing methods based on radar signals, such as average constant false alarm detection and so on. [0003] Taking pulse Doppler radar as an example, the common target detection method is: after the moving target detection is completed, a range Doppler two-dimensional plane is formed, such as figure 1 As shown, that is, each frame of echo data includes range dimension and...

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Problems solved by technology

[0004] The average constant false alarm detection processing for the range unit needs to be based on the premise that the target is in the Gaussian distribution noise background, and the probability density distribution of the target background far away from the clutter area must conform to the Gaussian distribution; however, in the actual radar working environment In the case of strong clutter background and unknown interfering targets and multiple targets, if the average constant false alarm detection is used to process the distance unit, the probability of false alarm will be too high, and the target Detect performance degradation issues

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