Broadband satellite-borne SAR system based on space-time sampling method

A space-time, space-borne technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc. effect with width

Active Publication Date: 2019-10-25
BEIHANG UNIV
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Problems solved by technology

By using a sampling rate lower than the Nyquist sampling frequency, the system of the present invention improves the problem that the traditional SAR system cannot realize high resolution and wide surveying swath at the same time

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  • Broadband satellite-borne SAR system based on space-time sampling method
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  • Broadband satellite-borne SAR system based on space-time sampling method

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[0227] based on figure 1 On the platform of the SAR signal processor of the shown SAR system, adopt hollow time sampling method of the present invention to carry out simulation, its parameter setting is as follows table 1:

[0228] Table 1 Imaging parameter settings

[0229] Orbit height (km) 693 wavelength(m) 0.0555 Signal Bandwidth (MHz) 100 Antenna height (m) 8.93 Antenna length (m) 3.793 Average power (W) 1413 Angle of incidence (°) 38.73～43.50 Oblique Angle(°) 0 Pulse repetition frequency (Hz) 1947

[0230] In order to illustrate the performance of the reconstruction, the results of the space-time sampling ocean scene reconstruction of the wide-field SAR system are as follows: Figure 6 As shown, the ocean scene reconstruction results of the traditional SAR system are as follows Figure 7 shown, from Figure 6 and Figure 7 It can be seen from the comparison that the result of reconstruction using the spac...

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Abstract

The invention discloses a broadband satellite-borne SAR system based on a space-time sampling method. The broadband satellite-borne SAR system is formed by splicing of Q sub-mapping strips; and a space-time sampling matrix is set on each corresponding sub-mapping strip. Firstly, a maximum cross-correlation coefficient is calculated for any space-time sampling matrix and then a coefficient averagevalue is calculated for the maximum cross-correlation coefficients; secondly, the space-time sampling matrixes are adjusted based on one-dimensional Gaussian distribution to obtain an optimal space-time sampling matrix group; thirdly, the optimal space-time sampling matrix group is assigned to the sub-mapping strips; and fourthly, a squint angle is added and thus each sub strip works in a squint state so as to avoid the emission pulse occlusion in the satellite-borne SAR system and the echo time delay of each sub-mapping strip is same and thus the echo of each sub-mapping strip is received completely, so that the broadband satellite-borne SAR system that enables the observation strip width to be increased while the resolution is ensured is obtained. According to the invention, a problem that the conventional SAR systems cannot simultaneously realize high resolution and wide mapping strip is solved by using a sampling rate lower than the Nyquist sampling frequency.

Description

technical field [0001] The present invention relates to a space-borne SAR system, more particularly, to a wide-width space-borne SAR system based on a space-time sampling method. Background technique [0002] Spaceborne SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) is an imaging system with all-weather and all-weather capabilities, not limited by natural conditions such as clouds, rain, fog, and night. The field has a wide range of application value. The simulation of the original echo signal of spaceborne SAR system is of great significance to the design of SAR system and the research of imaging algorithm. [0003] In October 1999, "Radar Imaging Technology" published by Harbin Institute of Technology Press and edited by Liu Yongtan pointed out that synthetic aperture radar (SAR, Synthetic Aperture Radar) is installed on a moving platform, and transmits and receives pulses according to a certain repetition frequency to form echoes. Signal. The structural block...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 于泽陈文姣李春升
Owner BEIHANG UNIV
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