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Structurally stable multi-target tracking method

A multi-target tracking and stable structure technology, which is applied in the field of radar multi-target tracking and stable structure multi-target tracking, can solve the problems of numerical structure instability, target loss of tracking during radar tracking, etc.

Active Publication Date: 2012-10-03
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] In order to solve the technical defect that the numerical structure of the existing target tracking method is unstable and cause the target to lose track during the radar tracking process, the present invention provides a multi-target tracking method with a stable structure, which establishes a numerically stable structure in the measurement update of multi-target tracking In the model, there are two semi-positive definite matrices subtracted in the variance matrix without error estimation, which can ensure that no symmetric matrix with negative eigenvalues ​​will be generated in a finite word length processing system, which can avoid target loss in the radar tracking process and the entire radar systematic error

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Embodiment Construction

[0026] 1. Define the discretization model of the i-th target in N target tracking as

[0027] x i (k+1)=Φ(k+1,k)x i (k)+Λ(k)ω i (k),

[0028] In the formula is the state vector, (x, y, z) is the position coordinates of the target in the ground reference Cartesian coordinate system, ω i (k) is the process noise vector, Φ(k+1, k)=Φ=diag[Φ 1 , Φ 1 , Φ 1 ] is the state transition matrix, Λ = ∫ kT ( k + 1 ) T Φ ( k + 1 , τ ) Γ ( τ ) dτ = Λ i 0 0 ...

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Abstract

The invention discloses a structurally stable multi-target tracking method which is used for solving the technical problem of failure in target tracking by radars due to instability of numerical structures of existing target tracking methods. The technical scheme includes that the method is characterized in that a numerical stable structural model is set up, subtraction of two positive semidefinite matrixes in an estimation error variance array is avoided, and symmetric matrixes with negative characteristic values cannot be generated in a processing system with limited word length. By means of setup of the numerically stable multi-target tracking structural model, subtraction of two positive semidefinite matrixes in the estimation error variance array is avoided, numerical diffusion in the processing system with limited word length is avoided, and accordingly reliability of a target tracking system is guaranteed while failure in target tracking by radars and faults of a whole radar system are avoided.

Description

technical field [0001] The invention relates to a radar multi-target tracking method, in particular to a multi-target tracking method with a stable structure, and belongs to the field of information technology. Background technique [0002] Multi-target tracking technology is widely used in military and civilian fields, and can be used for air target detection, tracking and attack, air missile defense, air traffic control, port and ocean surveillance, etc. In recent years, with the change of the battlefield environment and the development of countermeasures and anti-countermeasures technology, a series of problems such as strong background clutter, low signal-to-noise ratio, low detection probability and high false alarm rate have arisen. and accuracy put forward higher requirements. [0003] The purpose of multi-target tracking is to correspond the measurements received by the detector to different information sources, form different observation sets or trajectories, estim...

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Application Information

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IPC IPC(8): G01S13/66G01S7/40
Inventor 史忠科
Owner NORTHWESTERN POLYTECHNICAL UNIV