A moving target detection method based on distance and speed matching

Abstract

The invention discloses a moving object detection method matching distance with speed. The method is divided to two stages. The first stage is a target initial acquisition stage which comprises the steps of: firstly, performing pulse compression on a plurality of target echo signals; performing coherent accumulation on each distance unit signal of the echo sequence along the slow time; finding a maximum value of the target echo signal after coherent accumulation, and calculating a target speed value according to the row position of the matrix where the maximum value is located; performing agglomerative algorithms on the signals in the row which are larger than a target capture detection threshold, and calculating a signal center value; and calculating a target distance door according to the signal center value. The second stage is a target measurement stage which comprises the steps of: constructing an energy matching signal according to the target speed value and the initial value ofthe distance door; performing matching filtering on the row signal of the matrix where the maximum value of the target echo signal is located after coherent accumulation and a constructed energy matching signal; comparing the maximum value with a target measurement detection threshold; and calculating a target distance value, and outputting a target distance and a speed measurement value. According to the moving object detection method, the target detection signal to noise ratio is improved.

Description

technical field [0001] The invention belongs to the research field of radar signal processing technology, and relates to a method for detecting and measuring a high-speed moving target. Background technique [0002] For radar detection of high-speed maneuvering targets in space, under the condition of limited radar power-aperture product, long-term coherent accumulation must be used to improve the signal-to-noise ratio of target detection. Due to the high-speed movement of the target, different echo pulses will move across distance units, and the traditional coherent accumulation method will have gain loss, resulting in a decrease in detection performance. In order to improve the detection performance, on the one hand, the distance unit of the target echo is corrected first, and then the coherent accumulation is carried out; on the other hand, the energy accumulation is carried out after the coherent accumulation. [0003] At present, the main method for correcting the targ...

AI Technical Summary

Problems solved by technology

This method is not sensitive to the movement of scattering points across distance units caused by target movement, but there will be a decrease in measurement accuracy and energy loss, and the detection performance will decline to a certain extent.

Images