High-frequency airborne FM continuous wave SAR motion compensation and imaging processing method

A technology of frequency modulation continuous wave and motion compensation, which is applied in the radio wave measurement system, radio wave reflection/reradiation, utilization of reradiation, etc., can solve the problem of inability to process frequency modulation continuous wave real-time echo data, and does not involve SAR motion compensation technology and other issues to achieve a good practical effect

Active Publication Date: 2017-04-26
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

(3) SAR real-time imaging method based on FM continuous wave (CN102590812A), this invention mainly solves the problem that existing methods cannot process FM continuous wave real-time echo data
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  • High-frequency airborne FM continuous wave SAR motion compensation and imaging processing method
  • High-frequency airborne FM continuous wave SAR motion compensation and imaging processing method
  • High-frequency airborne FM continuous wave SAR motion compensation and imaging processing method

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[0038] Reference figure 1 , figure 2 , The present invention improves the traditional range Doppler imaging algorithm, compensates the intrapulse range movement, RVP and tilt terms of FM continuous wave, and further combines the imaging algorithm and FM continuous wave SAR motion compensation to realize unmanned FM continuous wave SAR imaging method based on mobile platform.

[0039] The motion compensation and imaging processing method for high-frequency airborne FM continuous wave SAR of the present invention includes the following steps:

[0040] 1. Perform first-order line-of-sight motion compensation on the original data, that is, phase compensation relative to the center line of the scene. Take the distance R from the center line of the scene ref For reference, r RI In order to refer to the motion error at the slope distance, the yaw error and the corresponding phase error of the SAR carrier platform in the line of sight (LOS) are calculated.

[0041] r RI (t m ,R ref )=z ...

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Abstract

The invention provides a high-frequency airborne FM continuous wave SAR motion compensation and imaging processing method, which compensates for intra-pulse range migration, RVP and a slope item of FM continuous waves through improving the traditional range-Doppler imaging algorithm, further integrates the imaging algorithm with FM continuous wave SAR motion compensation, and implements an FM continuous wave SAR imaging method based on a UAV platform. The high-frequency airborne FM continuous wave SAR motion compensation and imaging processing method combines the actual aerial carrier flight condition, brings forward the motion compensation method suitable in a FM continuous wave mode, combines the motion compensation method with the improved imaging algorithm, and realizes FMCW SAR high resolution imaging in the case of aerial carrier motion error.

Description

technical field [0001] The invention relates to an airborne frequency modulation continuous wave SAR motion compensation and imaging method, which is suitable for a miniaturized SAR system adopting a frequency modulation continuous wave system. Background technique [0002] The highly miniaturized FMCW (Frequency Modulated Continuous Wave) SAR (Synthetic Aperture Radar) has a series of advantages such as simple structure, low price, low power consumption, and low probability of interception. It is very suitable for the rapidly developing and widely used small UAV platform. The high-frequency (Ka) SAR system has the characteristics of high resolution and similarity to the visible light representation of ground objects, and it is more and more used in civilian applications such as search and rescue, regional monitoring, disaster monitoring and control, and small UAVs for ground reconnaissance. and other military fields. [0003] At present, the UAV-borne high-frequency freque...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 唐侃刘庆波王树文蔡昆周郁崔永香
Owner SHANGHAI RADIO EQUIP RES INST
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