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A Space-borne SAR System Based on Space-Time Sampling Method

A space-time, spaceborne technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve the problem of not being able to achieve high resolution and wide swath at the same time, and increase the width of the observation band. Effect

Active Publication Date: 2021-03-09
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

Method used

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  • A Space-borne SAR System Based on Space-Time Sampling Method
  • A Space-borne SAR System Based on Space-Time Sampling Method
  • A Space-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 space-time sampling method-based wide space-borne SAR system, the wide SAR system is spliced ​​by Q sub-swaths, corresponding to each sub-swath there will be a space-time sampling matrix; The first aspect is to calculate the maximum cross-correlation coefficient of any space-time sampling matrix, and then calculate the coefficient mean of the maximum cross-correlation coefficient; the second aspect is to adjust the space-time sampling matrix according to the one-dimensional Gaussian distribution to obtain the optimal space-time Sampling matrix group; in the third aspect, the optimal space-time sampling matrix group is assigned to the sub-swath; in the fourth aspect, in order to avoid the transmission pulse occlusion in the spaceborne SAR system, each sub-band works in a squint state by adding a squint angle, The echo delay of each sub-swath is guaranteed to be the same, so that the echoes of each sub-swath can be completely received, and finally a wide-field SAR system that can increase the width of the observation swath while ensuring the resolution is obtained. The invention improves the problem that the traditional SAR system cannot realize high resolution and wide surveying band at the same time 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...

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Application Information

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