Moving target joint tracking-before-detection method for video synthetic aperture radar

Abstract

The invention discloses a moving target joint tracking-before-detection method for a video synthetic aperture radar, and mainly solves the problems that an existing tracking-before-detection method islarge in calculation amount and poor in maneuvering target detection performance. According to the scheme, continuous multi-frame radar observation data is divided into image data and distance Doppler data, the first two frames of images in the image data are preliminarily detected, track heads are initialized, and candidate regions are formed; state transition is carried out on all state pointsin the previous frame of candidate region to obtain a candidate region of the next frame of target, the candidate region is screened by combining the image and the distance Doppler data, and then a value function and a backtracking function are calculated; after all frames of data are processed, a target is judged through comparison of a value function and a threshold value, and a prediction trackof the target is obtained through a backtracking function. On the premise of ensuring low false alarm rate and high detection rate of the maneuvering moving target, the calculation amount of the tracking-before-test method is effectively reduced, and the method can be used for efficiently detecting the shadow of the moving target by a radar system.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a moving target joint detection method, which can be used for shadow detection of moving targets by video synthetic aperture radar. Background technique [0002] Video Synthetic Aperture Radar ViSAR is a high frame rate imaging system working in high frequency band. Video synthetic aperture radar usually adopts spotlight imaging mode, and obtains high frame rate image sequence through overlapping aperture processing technology to realize real-time observation of the imaging area, and obtains the range Doppler spectrum after processing the echo generated by each frame of image . During the synthetic aperture time, on the one hand, due to the occlusion of the target on the ground area, and on the other hand, due to the Doppler translation caused by the relative motion between the target and the radar, the moving target leaves a shadow on the actual posi...

AI Technical Summary

Problems solved by technology

However, this method has two deficiencies. One is that the amount of calculation increases rapidly with the increase of the number of frames. The other is that only the image data is used and the range Doppler spectrum is not used, so the detection performance of the strong maneuvering target is not good.

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