Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for high-accuracy inverse synthetic aperture radar (ISAR) motion compensation of non-synergistic targets

A motion compensation, non-cooperative technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problem that the compensation effect cannot be obtained

Inactive Publication Date: 2013-11-20
BEIHANG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of large distance migration, the application of these methods cannot get a good compensation effect

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for high-accuracy inverse synthetic aperture radar (ISAR) motion compensation of non-synergistic targets
  • Method for high-accuracy inverse synthetic aperture radar (ISAR) motion compensation of non-synergistic targets
  • Method for high-accuracy inverse synthetic aperture radar (ISAR) motion compensation of non-synergistic targets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] Embodiments of the present invention are described in detail through simulation with reference to the accompanying drawings. figure 1 It is a flow chart of the implementation of the method of the present invention.

[0044] In order to verify the effectiveness of this method, firstly, the echo data of a group of scattered points is simulated by using the step frequency ISAR, and the specific process of the motion compensation method is explained by the echo data. In the simulation, the radar transmits M=128 groups of pulse trains, and the number of modulated pulses in each group is N=128. Start pulse frequency f 0 =10GHZ, pulse repetition frequency prf=20000Hz, total bandwidth B=128MHZ. Assume the initial distance R between the radar and the target center 0 =16000m, target radial velocity v t =170m / s, radial acceleration a t =0.1m / s 2 , the rotational angular velocity

[0045] The distribution of scattering points used in this simulation is as follows figure ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for high-accuracy inverse synthetic aperture radar (ISAR) motion compensation of non-synergistic targets. The method comprises the following steps of: redefining a reference range profile on the basis of the conventional envelope correlation method; and calculating a cross correlation function EC (taum+1) between a range profile to be aligned and the reference range profile, wherein m is equal to 0, 1, ..., and M-1, M is the range profile group number, and taum+1 is the distance offset. The core technology of the motion compensation method is to accurately estimate the offset between each range profile and the reference range profile, namely eliminating range migration, performing estimation and compensation on a phase vector in each range profile to eliminate phase errors of the targets, and finally obtaining a high-accuracy ISAR image after the motion compensation. By the method, the problem of imaging fuzzy caused by target motion can be obviously eliminated, and an effective method for providing high-resolution ISAR images of high-speed moving targets is provided.

Description

technical field [0001] The invention relates to an inverse synthetic aperture radar (Innerves Synthetic Aperture Radar, ISAR for short) motion compensation method, in particular to a high-precision ISAR motion compensation method for non-cooperative targets moving at high speed. Background technique [0002] Inverse Synthetic Aperture Radar (ISAR) usually uses the angular rotation of the target to collect reflectivity data, which can generate high-quality images of non-cooperative targets, and then can observe long-distance targets all-weather, and has important applications in civil and military fields. value. ISAR is more adaptable to bad weather than traditional imaging sensors, and can be applied to high-precision target recognition. However, the relative motion between radar and target usually causes image blur. Therefore, motion compensation is necessary to improve image quality and image resolution. one less step. [0003] The target motion includes translational mo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 陈娟袁运能
Owner BEIHANG UNIV