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Object tracking method of passive radar

A technology of target tracking and passive radar, which is applied in the field of radar, can solve the problem of not being able to form the same track with measured data, and achieve the effect of improving the accuracy of target estimation

Inactive Publication Date: 2017-07-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the problem that the existing technology can only form a stable track for the continuous sampling measurement data of the target, and cannot form the same track for the measurement data with interruptions before and after the same target

Method used

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  • Object tracking method of passive radar

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Embodiment

[0137] The passive radar target tracking method of the present embodiment assumes that the passive radar tracking system is a three-station fixed station tracking system on a two-dimensional plane (that is, the system includes 3 fixed radar stations at a certain distance on the same plane), and The simulation is carried out by using matlab software.

[0138] Let the position coordinates of the three radar stations be O 1 (-20km,0), O 2 (20km,0), O 3 (0,20km), and assume that the azimuth measurement of the three stations is independent of each other, the mean value of the azimuth measurement error is 0, and the standard deviation is σ β =0.02°, and obey the Gaussian distribution.

[0139] Assume that the system sampling interval T s = 1s,T th =22s,T sm =3s, the total simulation time T=120s.

[0140] Suppose there are three targets within the observation range: target T1 moves at a constant speed within 0 to 120 seconds, and its initial position is X T1 (-21km, 75km), it...

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Abstract

The invention relates to an object tracking technology of a passive radar, and discloses a multi-object tracking method of the passive radar. Positioning is carried out according to direction angle information of a multi-station passive radar, and a speed, acceleration and angle limited visualized method is used to initialize a track; and an IMM algorithm is used to track a moving object, a UKF algorithm is used to solve a nonlinear problem of a tracking system, a JPDA method is used to a multi-object association problem, and the track of the object is obtained, and the state of the object is estimated. Certain measurement interruption track is predicted, a new track within Tth+Tsm after interruption time is estimated reversely, a sequential association method is used to associate new and old tracks and obtain an examination matrix psiN*M, and the psiN*M is limited to solve an association confirmation matrix omegaN*M associated with the optimal track. Thus, multiple objects of the passive radar can positioned and tracked, the object estimating precision within the track initialization time is improved, and the interruption track association problem within the threshold time can be solved.

Description

technical field [0001] The invention relates to radar technology, in particular to passive radar target tracking technology. In particular, there are multiple targets in the tracking area, and the track of each target will be interrupted, resulting in a discontinuous track after the tracking filter. Background technique [0002] In the field of radio detection technology, passive radar itself does not emit electromagnetic waves, but locates and tracks targets by receiving electromagnetic information radiated by targets. The passive radar system has the advantages of long range and good concealment, which plays an important role in improving the system's survivability in the electronic station environment. The passive radar system determines the radiation source and its carrying platform or target position information based on the electromagnetic wave parameters radiated by the target. The key technology of the system lies in the processing of the measurement data and the fo...

Claims

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Application Information

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IPC IPC(8): G01S13/72
CPCG01S13/726
Inventor 孙甫超张顺生
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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