Polynomial Fitting ISAR Envelope Alignment Method for Piecewise Linear Estimation

A polynomial fitting and envelope alignment technology, applied in the field of polynomial fitting ISAR envelope alignment, can solve the problems that it is difficult to suppress the target echo envelope drift and echo jump, and the envelope alignment cannot be achieved, so as to overcome the " "jump" phenomenon, improve translation compensation performance, and suppress the effect of envelope "drift"

Inactive Publication Date: 2015-10-28
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is: under the condition of strong noise measurement, the existing envelope alignment method is difficult to suppress the problem of target echo envelope drift and echo jump, and cannot perform accurate envelope alignment. Polynomial Fitting ISAR Envelope Alignment Method for Segment Linear Estimation

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  • Polynomial Fitting ISAR Envelope Alignment Method for Piecewise Linear Estimation
  • Polynomial Fitting ISAR Envelope Alignment Method for Piecewise Linear Estimation
  • Polynomial Fitting ISAR Envelope Alignment Method for Piecewise Linear Estimation

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Embodiment Construction

[0021] Reference figure 1 The specific implementation steps of this embodiment are as follows:

[0022] Step 1. The echo signal received by the radar is compressed into range pulse as:

[0023] S ( t ^ , t m ) = X k S k ( t ^ , t m )

[0024] = X k σ k · sin c [ B ( t ^ - 2 R ( t m ) c ) ] · exp [ - j 4 π f c R ( t m ) c ] - - - ( 1 )

[0025] among them, t ^ = t - mT r Is fast time, t m =mT is slow time, m is an integer, T r Pulse repetition period (PRI), σ k Is the complex scattering coefficient of the scattering point on the target, f c Carrier frequency of the radar transmitting signal;

[0026] Step 2. Model the envelope error function and find the derivative:

[0027] 2a) The envelope error function ΔR(t m ) Is modeled in polynomial form

[0028] ΔR ( t m ) = X ...

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Abstract

The invention discloses a low signal-to-noise ratio ISAR envelope alignment method based on piecewise linear movement estimation. The method mainly solves the problem that in the prior art, ISAR echo envelopes with a low signal-to-noise ratio can not be effectively or quickly aligned. According to the implementation scheme, envelope errors of target echoes are modeled in a high-order polynomial form based on the continuity of target movement, a full-aperture time is divided into multiple periods of sub-aperture time, and envelope errors in each period of sub-aperture time are approximated to be linear. Linear coefficient estimation is carried out on each sub-aperture through a traditional envelope alignment algorithm, and estimation on envelope errors of a full aperture is achieved through the least square method based on linear coefficient estimation results of the sub-apertures. According to the method, efficient and accurate alignment of the target echo envelopes can be achieved under the condition of a low signal-to-noise ratio, and the method can be used in the target detection and recognition and ISAR imaging fields.

Description

Technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to inverse synthetic aperture radar (ISAR) imaging processing, in particular to a piecewise linear estimation polynomial fitting ISAR envelope alignment method, which is suitable for packetizing low signal noise (clutter) signals Network alignment processing. Background technique [0002] Inverse Synthetic Aperture Radar (ISAR) achieves high range resolution by transmitting large-bandwidth signals, and passively forms a synthetic array to achieve high azimuth resolution by relying on the relative motion between the radar and the target. The movement of the target relative to the radar can be divided into rotation and translation components. The rotation component is the rotation of the target around a certain reference point. If its translational component is compensated, it is equivalent to a plane turntable model. The translational component is that the target attitude ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S7/41G01S13/904G01S13/9064
Inventor 张磊董祺全英汇许志伟徐刚
Owner XIDIAN UNIV
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