A method for estimating course and speed of sea surface target

A target and heading technology, applied in the field of sea target heading and speed estimation, can solve the problems of sea target tracking loss and motion pattern mismatch, and achieve the effect of reducing a priori uncertainty, increasing confidence, and improving estimation accuracy.

Active Publication Date: 2019-01-04
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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Problems solved by technology

However, this method is only effective when the sea surface target moves in a straight line at a uniform speed. When the sea surface target maneuvers (such as a coordinated turn), the dynamic model of the built target does not match the actual motion mode of the target, which eventually leads to Tracking of surface targets lost

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  • A method for estimating course and speed of sea surface target
  • A method for estimating course and speed of sea surface target
  • A method for estimating course and speed of sea surface target

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specific Embodiment

[0041] Consider the case of a sea target making a coordinated turning maneuver in a two-dimensional plane. Assuming that both the system noise and the measurement noise obey the Gaussian distribution, the carrier aircraft moves in a straight line at a uniform speed, and the trajectory of the target on the sea surface is as follows: figure 2 shown;

[0042] target state vector u k and Respectively represent the position and velocity of the sea surface target on the X axis at time k, and y k and Respectively represent the position and velocity of the sea surface target on the Y axis at time k. The target motion model is represented by a coordinated turn (CT) model:

[0043]

[0044] in represents Gaussian noise,

[0045] Its covariance matrix is Therefore, the covariance matrix Q of the system noise k-1 It can be expressed as:

[0046]

[0047] Where ω represents the turning angle rate of the sea surface target, T represents the sampling period, and the meas...

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Abstract

The invention provides a method for evaluating navigation direction and navigation speed of a sea surface target. The method comprises the steps of establishing a corresponding system state space model by means of motion state of the sea surface target, and establishing a measurement model according to a measurement principle of an airborne radar; calculating a prior mean value and a prior covariance matrix of system state in a volume Kalman filtering algorithm; calculating the prior mean value and the prior covariance matrix of the system state in a truncated Kalman filtering algorithm; afterwards, calculating a system state posteriori mean value and a system state posteriori covariance, and finally introducing an adaptive adjusting mechanism, calculating the final posteriori mean value and the final covariance matrix of the system state.

Description

technical field [0001] The invention relates to the technical field of sea surface target tracking, in particular to a method for estimating the heading and speed of a sea surface target. Background technique [0002] The course speed is an important characteristic of the sea surface target, and it is very important to accurately estimate the course speed for the tracking of the sea surface target. There are many differences between airborne radar tracking of sea surface targets and air target tracking, and its detection performance faces some new challenges. Among them, due to the slow movement speed of sea surface targets, it is difficult to move out of the minimum range of airborne radar in a short period of time. The resolution unit leads to a slow convergence speed of target heading and speed estimation, which is not conducive to the commander's rapid decision-making. In addition, due to the influence of airborne radar measurement accuracy, sea surface target heading e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/58
CPCG01S13/588
Inventor 程然缪礼锋王婷婷
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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