Multi-frame Tracking-before-Detection Method for Airborne Early Warning Radar Based on Minimum Coverage Airspace

Abstract

The invention discloses a multi-frame pre-detection tracking method for an airborne early warning radar based on the minimum coverage airspace. In order to solve the unaligned measurement airspace grid caused by the movement of the radar platform, a dynamic programming-based tracking-before-detection algorithm brings about It is difficult to implement; the present invention first uses a measurement grid-aligned discretization method to discretize the entire state space, then uses the method of coordinate system change to determine the mapping relationship between measurement and state, and then traverses the maximum mapping results of each dimension to obtain Compress the size of the coverage airspace, then complete the accumulation data preparation corresponding to the minimum coverage airspace dimension according to the mapping relationship, and finally use the pre-detection tracking algorithm to complete the detection and tracking of the target; the method of the present invention preserves the original position of the measurement point trace as much as possible , in the case of retaining most of the measurement point traces, the size of the search space is compressed, and the computational burden of the algorithm is reduced while ensuring the tracking accuracy.

Description

technical field [0001] The invention belongs to the field of radar target detection, in particular to a multi-frame detection-before-tracking technology for weak targets by an airborne early warning radar. Background technique [0002] Placing the early warning radar on an airborne platform that can move flexibly in the air has very important military significance: a) The launch of the radar greatly reduces the influence of the curvature of the earth and terrain occlusion, so that the detection blind area of ​​the early warning radar is significantly reduced; b ) The movement of the carrier aircraft enables the radar surveillance area to change flexibly, providing the possibility of completing various surveillance tasks; c) The mobility of the carrier aircraft ensures that the radar has a strong survivability in combat missions. Therefore, moving ground-based and ship-borne early warning radars to launch platforms such as airplanes and balloons is an inevitable choice for re...

AI Technical Summary

Problems solved by technology

Both literatures did not consider the impact of carrier movement

[0004] In the published patent "A Method for Tracking Before Detection of Airborne Radar Weak Targets Based on Coordinate Calibration" (publication number: CN108983216A), the tracking before detection algorithm used is another implementation method of the DP-TBD algorithm. The method screens the original echo data with the goal of reducing the calculation amount of the algorithm, so that the data input to the tracker is the position information of the echo point. Although the problem of grid misalignment in the measurement space can be avoided, it is undoubtedly better than the original algorithm. loss of performance

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