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Multi-channel space-borne SAR antenna control error compensation method

An antenna control and error compensation technology, applied in the field of signal processing, can solve problems such as image quality degradation

Active Publication Date: 2013-12-11
BEIHANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned problems, aiming at the phase inconsistency between channels caused by the multi-channel space-borne SAR antenna control error, resulting in the problem of image quality degradation, a multi-channel space-borne SAR antenna control error compensation method is proposed, The invention can accurately compensate the phase error introduced by the antenna control error, effectively suppress the appearance of paired echoes, and improve the image quality

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Embodiment

[0137] In order to demonstrate the effectiveness of the present invention, the following point target simulation experiments are carried out. Some simulation parameters of the embodiment are shown in Table 1, and the simulation results are as Figure 5 with Image 6 As shown, Figure 5 with Image 6 The frequency map of the azimuth echo signal after filtering without antenna control error compensation and the frequency map of the azimuth echo signal after antenna control error compensation are respectively given.

[0138] Table 1 Some simulation parameters of the embodiment

[0139]

[0140] From Figure 5 It can be seen that when there is no antenna control error compensation, the echo signal frequency diagram after azimuth filtering is confused, which means that the phase error introduced by the antenna control error has an impact on the single-channel echo signal obtained from the multi-channel echo signal filtering process. ,From Image 6 It can be seen that after the antenna co...

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Abstract

The invention discloses a multi-channel space-borne SAR antenna control error compensation method. The method includes the following steps: (1) an antenna parameter is obtained, (2) an echo signal error phase is compensated, and (3) azimuth signal filtering processing is carried out. According to the multi-channel space-borne SAR antenna control error compensation method, phase errors caused by control errors of an antenna can be effectively compensated, inconsistency of phases of reception channels is eliminated, occurrence of paired echoes is prevented, and quality of images is improved. According to the multi-channel space-borne SAR antenna control error compensation method, an original echo signal times a compensation factor in a time domain, and accordingly compensation of the phase errors caused by the control errors of the antenna is finished and calculation efficiency is high. According to the multi-channel space-borne SAR antenna control error compensation method, the phase errors are compensated before imaging processing, and therefore an original imaging algorithm kernel does not need to be modified, and universality is strong.

Description

Technical field [0001] The invention belongs to the field of signal processing, and relates to a method for compensating a multi-channel satellite-borne SAR (Synthetic Aperture Radar) antenna control error. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR) is a kind of microwave imaging radar. Its characteristic is that it is not affected by weather and climate. It can observe all-time, all-weather, high-resolution, and large-area earth observation. Therefore, it is used in military target detection, marine Many fields such as monitoring, resource detection, agriculture and forestry are widely used. [0003] With the continuous improvement of space earth observation requirements, high-resolution and wide-band imaging has become the main development direction of spaceborne SAR. For the traditional single-channel spaceborne SAR system, high resolution and wide surveying strip are a pair of contradictions, which cannot meet the requirements of high resolution an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04G01S7/40G01S13/90
Inventor 陈杰匡辉杨威王鹏波曾虹程张豪杰
Owner BEIHANG UNIV
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