Adaptive angle tracking method based on digital phase-locked loop

A digital phase-locked loop and angle tracking technology, which is used in the reflection/re-radiation of radio waves, instruments, measuring devices, etc., and can solve problems such as slow convergence speed, divergent tracking performance at the end, poor convergence speed and angle tracking accuracy. , to achieve the effect of improving the convergence speed, small target angle tracking root mean square error, and excellent tracking performance

Active Publication Date: 2017-05-24
NANJING UNIV OF SCI & TECH
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[0004] The purpose of the present invention is to provide an adaptive angle tracking method based on a digital phase-locked loop, which solves the problems of slow initial converg

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  • Adaptive angle tracking method based on digital phase-locked loop
  • Adaptive angle tracking method based on digital phase-locked loop
  • Adaptive angle tracking method based on digital phase-locked loop

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[0035] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, those of ordinary skill in the art can imagine various implementations of the adaptive angle tracking method based on the digital phase locked loop of the present invention. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solutions of the present invention, and should not be regarded as all of the present invention or as a limitation or limitation to the technical solutions of the present invention.

[0036] Combine figure 1 , The steps of the adaptive angle tracking method based on the digital phase-locked loop of the present invention are:

[0037] The first step is to obtain the narrowband echo data of the current antenna front beam pointing. Through data processing such as digital down-conversion and decimation filtering on the original echo data, the requir...

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Abstract

The invention provides an adaptive angle tracking method based on a digital phase-locked loop. The method comprises steps that rapid Fourier transform is utilized to transform time domain signals of a sum beam and a difference beam to a frequency domain, and the monopulse angle measurement technology is then utilized to acquire an angle error; the angle error is then sent to a loop filter of which loop equivalent noise bandwidth changes along with target angle change to acquire a filtering value of the angle error, the filtering value is accumulated to a numerical control oscillator, and adaptive target angle tracking is realized. The method is advantaged in that an angle error convergence speed and angle tracking precision in a target angle tracking process are improved.

Description

technical field [0001] The invention belongs to the technical field of radar target tracking methods, and in particular relates to an adaptive angle tracking method based on a digital phase-locked loop. Background technique [0002] In the angle of radar tracking target, the commonly used angle tracking method is to copy the mature method used in target distance tracking to angle tracking. These methods are usually based on the Kalman Filtering (KF) method. [0003] All Kalman filter-based maneuvering target tracking methods, no matter whether they are linearized for the nonlinearity of the system or use multiple models to represent the target motion state, the state transition matrix in the model determines whether it can be tracked accurately The key to the goal. However, in the usual scenario of airborne radar tracking a maneuvering target, due to the unknown of the actual motion model of the target, the pre-set state transition matrix in the tracking model often does n...

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Application Information

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IPC IPC(8): G01S13/66G01S7/41
CPCG01S7/41G01S13/66
Inventor 盛卫星蒋兵兵张仁李韩玉兵马晓峰
Owner NANJING UNIV OF SCI & TECH
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