A Target Detection and Track Search Method for Airborne Pulse LiDAR

Abstract

The invention provides a target detection and track search method for an onboard pulsed laser radar, and belongs to the technical field of signal processing and target detection of laser radar. The method is characterized by performing, in an observation period, a targeted search according to the possible speed direction of a target by using the motion characteristics of the target in order to reduce a large number of invalid searches; simultaneously, shifting the echo data according to a time offset corresponding to the specific search speed, accumulating the echo data, using the maximum value as a possible track point, performing step search in all possible speed ranges, taking a plurality of possible track points as potential targets, and determining the track and the speed of the target if a set confidence threshold value is satisfied in consecutive multiple observation periods so as to complete the target capture. The method only needs two operations including data shifting and accumulation, is particularly suitable for the high-speed parallel digital processing by a DSP or FPGA, has a small calculation amount and fast target detection and track search real-time processing speed, and improves a signal-to-noise ratio and detection performance.

Description

technical field [0001] The invention relates to the technical field of laser radar signal processing and target detection, in particular to a pulse laser radar target detection and track search method, which is especially suitable for detecting low observability targets in the environment of strong clutter and low signal-to-noise ratio detection. Background technique [0002] In the environment of strong clutter and low signal-to-noise ratio, the detection of low observability targets is an important research direction in the field of radar and photoelectric detection. In the airborne photoelectric detection system, infrared can be used to search and detect the thermal radiation of airspace targets because of its long range, so as to judge the presence of targets and lock the target's position; laser (infrared band) has a short detection range and can be used to obtain targets. The radial distance and other information; the combination of the two realizes the positioning of...

AI Technical Summary

Problems solved by technology

In the figure, the target track is represented by According to the classic TBD detection method, the original 200 frames of multi-pulse laser echo observation data of 1.6×10 8 sample points to perform TBD detection processing such as exhaustive search or dynamic programming, it needs to start from 8×10 per frame 5 traversing and searching all possible directions of the echo observation data of a sample point and a total of 200 frames to find the track route of the target, the computational load will be very huge and difficult to process in real time

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