Smooth procession cone parameter estimation method based on high-resolution ISAR imaging

A parameter estimation and high-resolution technology, applied in the field of signal processing and radar imaging, can solve the problems of large amount of calculation and a large amount of prior information, and achieve the effect of simple calculation, simple operation and less prior information

Active Publication Date: 2013-12-04
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that the method of loop iteration makes the calculation amount very large, and this method requires a lot of prior information

Method used

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  • Smooth procession cone parameter estimation method based on high-resolution ISAR imaging
  • Smooth procession cone parameter estimation method based on high-resolution ISAR imaging
  • Smooth procession cone parameter estimation method based on high-resolution ISAR imaging

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Embodiment Construction

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0050] Refer to attached figure 1 , the detailed steps of the present invention are as follows:

[0051] Step 1. Obtain the frequency-slow time domain echoes recorded by the inverse synthetic aperture radar ISAR.

[0052] The inverse synthetic aperture radar ISAR transmits the chirp signal and receives the echo, and obtains the frequency-slow time domain echo of the inverse synthetic aperture radar ISAR with the frequency as the row vector and the azimuth as the column vector:

[0053] s ( f , t ) = win * exp ( - j 4 π c ( f c + ...

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Abstract

A smooth procession cone parameter estimation method based on high-resolution ISAR imaging mainly solves the problems that joint estimation on cone geometrical parameters and motion parameters in the parameter estimation process of a smooth cone is difficult to carry out, and the calculated amount is large and the needed prior information amount is large in narrow-band imaging and parameter estimation. The method includes the steps of 1, obtaining frequency in ISAR recording, namely, a slowness-time domain echo, 2, estimating the number of Doppler ambiguity times of the echo by utilizing a curve fitting method, 3, compensating the number of Doppler ambiguity times of the echo, 4, correcting range walk of the echo, 5, carrying out the ISAR imaging on echo data by utilizing a matched filtering method, and accurately estimating position information of a scattering center, and 6, carrying out the joint estimation on cone sizes, radar sights and angles of precession by utilizing a least square fitting method. The smooth procession cone parameter estimation method has the advantages of being easy to operate, high in estimation accuracy, small in amount of needed prior information, and capable of carrying out the joint estimation on the cone geometrical parameters and the motion parameters.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a smooth precession cone parameter estimation method based on high-resolution inverse synthetic aperture radar (Inverse Synthetic Aperture Rader, ISAR) imaging in the technical field of radar imaging. The invention accurately estimates the geometric parameters and precession parameters of the cone by performing accurate motion compensation and high-resolution ISAR imaging on the smooth precession cone in the air. Background technique [0002] When the smooth cone target is flying at high speed in the air, the spin motion maintains the stability of its attitude, and the lateral disturbance will convert the spin motion into a precession form, where the spin refers to the rotational motion of the cone around its own symmetry axis , precession is the rotation of the cone around the cone axis while spinning. [0003] Compared with narrowband signals, wideband signals ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/50G01S13/90
Inventor 白雪茹宋扬杜兰刘宏伟肖金国王鹏辉王英华
Owner XIDIAN UNIV
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