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Mobile compensation process for double-base synthetic aperture radar imaging

A technology of synthetic aperture radar and motion compensation, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measurement devices, etc., can solve the problem of increasing the cost of the bistatic SAR system, the difficulty of detecting the rapid disturbance of the carrier aircraft, and the inaccuracy of parameters advanced questions

Inactive Publication Date: 2009-06-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, if there is no inertial navigation system (Inertial Navigation System, referred to as: INS) and global positioning system (Global Position System, referred to as: GPS), or the parameters provided by the navigation system are not high in accuracy, the above method is invalid
Furthermore, INS and GPS navigation instrument systems are also difficult to detect the rapid disturbance of the carrier aircraft
Also, the use of INS and GPS itself adds to the cost of a bistatic SAR system

Method used

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  • Mobile compensation process for double-base synthetic aperture radar imaging
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  • Mobile compensation process for double-base synthetic aperture radar imaging

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Embodiment Construction

[0091]The present invention mainly uses the method of processing the bistatic SAR measured data to verify, and all steps and conclusions are verified correctly on MATLAB 7.0. The specific implementation steps are as follows:

[0092] Step 1 Identify mixed strong signals containing strong scatter point targets

[0093] The echo data received by the Bi-SAR receiver is a 2400×8000 complex matrix M raw (m, n), where m is the range sampling point number of the Bi-SAR receiving radar, 2400 is the range sampling point number of the receiver radar within a single pulse repetition period, m=1,...,2400; n is the receiving The number of pulses observed by aircraft radar, N a is the number of pulses observed by the receiver radar, n=1,...,8000; the Bi-SAR echo data is processed along the distance direction by pulse pressure, that is, matched filtering, and the echo data M after distance compression is obtained comp (m, n).

[0094] From the two-dimensional echo signal data matrix M c...

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Abstract

The invention provides a motion compensation method for bistatic synthetic aperture radar imaging based on a phase tracking algorithm. In the method, firstly, by designing a set of narrow-band filters, inhibiting the echo effects of the neighboring targets and acquiring the phase position information of the echo signal of strong scattering points, phase position compensation and direction compression are carried out on the neighboring distance unit, thereby acquiring a bistatic SAR imaging result with high accuracy; secondly, extracting bistatic SAR imaging processing parameters by directly using echo data can lower the cost of a bistatic SAR system; in addition, self-focusing technology which utilizes the echo data to process the signals can compensate the effect of the rapid disturbance which is difficult to be detected by a navigation system. The method provides technical supports for the study of advanced high-resolution radar imaging technology.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to the motion compensation technology of Bistatic Synthetic Aperture Radar imaging (Bi-SAR for short). Background technique [0002] The transmitter and receiver of the bistatic synthetic aperture radar are placed on different platforms. The transmitter emits a signal to irradiate a certain target scene, and the receiver receives the echo signal of the irradiated target scene. The Doppler frequency shift generated by the relative movement of the target is compressed in azimuth to achieve high-resolution imaging of the target in the range direction and azimuth direction respectively. [0003] Bistatic SAR has many outstanding advantages: [0004] (1) The non-backscatter information of the target or scene can be obtained, which is beneficial to improve the target recognition performance. [0005] (2) It has the characteristics of long range, concealment and strong ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 王建国杨柳恩徐三元张晓玲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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