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An Airborne Digital Array Radar Tracking Method for Weakly Maneuvering Targets

A digital array radar and maneuvering target technology, applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve the problems of limited tracking accuracy, filter divergence, and aggravated differences, and achieve the goal of reducing filter disturbance and fast convergence Effect

Active Publication Date: 2018-03-09
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, due to the unpredictable motion model of the target, the airborne digital array radar using the Kalman filter tracking algorithm cannot quickly reach the convergence state in the initial stage of tracking, and the tracking accuracy is limited, and sometimes even filter divergence occurs
On the other hand, when entering the end stage of target tracking, that is, when the airborne digital array radar is close to the target, the angular position of the target seen from the digital array radar changes rapidly, and the state transition matrix in the traditional angle tracking algorithm based on Kalman filter The difference between the described target motion characteristics and the target's real motion trajectory model is intensified, and the tracking accuracy cannot be guaranteed, and the target tracking task cannot even be completed.

Method used

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  • An Airborne Digital Array Radar Tracking Method for Weakly Maneuvering Targets
  • An Airborne Digital Array Radar Tracking Method for Weakly Maneuvering Targets
  • An Airborne Digital Array Radar Tracking Method for Weakly Maneuvering Targets

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Embodiment Construction

[0022] combine figure 2 , the method for the airborne digital array radar of the present invention to track the angle of the weak maneuvering target, comprises the following steps:

[0023] The first step, airborne digital array radar and target motion scene modeling

[0024] Set in the geodetic coordinate system, the abscissa M of the airborne digital array radar at time 0 of the system x =4000, vertical coordinate M y =5000, vertical coordinate M z =10000, target abscissa T x =7939.6, ordinate T y =9768.1, vertical coordinate T z =14978.7, the unit is m, the relative position is as image 3 and Figure 4 shown. Taking the position of the target at time 0 as the origin o' of the coordinate system, the airborne digital array radar points to the target as the positive direction of the x' axis, and in the x'y'z' coordinate system (the o'z' axis is located at In the vertical plane of , and o'x' to o'z' is clockwise, the o'y' axis forms a right-handed coordinate system w...

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Abstract

The invention provides an airborne digital array radar tracking method for weakly maneuvering target angles. In the process of tracking the target, the pitch angle error and azimuth error are used as observation values ​​to detect the inflection point of the real-time measurement curve. When the inflection point is detected, the digital loop filter uses a smaller loop equivalent noise bandwidth. Track the target. The invention accelerates the angle error convergence speed of the angle tracking loop, reduces the filter disturbance at the inflection point, and maintains the continuity of tracking.

Description

technical field [0001] The invention belongs to the field of airborne digital array radar target tracking, and in particular relates to a method for airborne digital array radar to track weakly maneuvering target angles. Background technique [0002] In 1961, after R.E. Kalman proposed the Kalman filter algorithm, scholars proposed a large number of algorithms based on Kalman filter for the angle tracking of maneuvering targets by airborne digital array radar. Kalman filtering includes state equations and observation equations, in which the state transition matrix in the state equation is the modeling of the motion characteristics of the tracking target, and is also the key to determining whether the target can be accurately tracked. In general, due to the unpredictability of the target's motion model, the airborne digital array radar using the Kalman filter tracking algorithm cannot quickly reach the convergence state in the initial stage of tracking, and the tracking accur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/68
Inventor 蒋兵兵张仁李韩玉兵李静盛卫星马晓峰
Owner NANJING UNIV OF SCI & TECH
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