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Satellite borne SAR satellite load reduction data rate processing method

A processing method and data rate technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of high azimuth oversampling rate and SAR satellite load reducing data rate, etc., and achieve a signal-to-noise ratio, Guaranteeing the effect of Earth observation performance

Active Publication Date: 2018-03-23
SHANGHAI SATELLITE ENG INST
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Problems solved by technology

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a processing method for reducing the data rate of the on-board SAR satellite load, which solves the azimuth that SAR system design faces under the azimuth ambiguity and zebra diagram design requirements to a certain extent The large data rate problem caused by the high oversampling rate can effectively guarantee the earth observation performance of the SAR system, and has the advantage of maintaining the signal-to-noise ratio, which is realized by azimuth resampling of the echo data received by the satellite

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  • Satellite borne SAR satellite load reduction data rate processing method
  • Satellite borne SAR satellite load reduction data rate processing method
  • Satellite borne SAR satellite load reduction data rate processing method

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[0028] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0029] Such as figure 1 Shown, the processing method that space-borne SAR satellite load of the present invention reduces data rate comprises the following steps:

[0030] Step 1, input SAR (Synthetic Aperture Radar) echo data, input SAR (Synthetic Aperture Radar) echo data to the system, assuming that the system pulse repetition frequency is PRF;

[0031] Step 2, Doppler center estimation, using the attitude measurement data or the original echo data to estimate the Doppler center, assuming that...

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Abstract

The invention provides a satellite borne SAR satellite load reduction data rate processing method. The method comprises the steps that 1 SAR echo data are input; 2 Doppler center estimation is carriedout; 3 the downsampling multiple is determined; 4 a downsampling interpolation kernel function is built; 5 on-board data re-sampling is carried out; and 6 signal re-sampling is carried out. Accordingto the invention, the problem of large data rate, which is caused by high azimuth oversampling rate faced by the SAR system design under the requirements of azimuth ambiguity and zebra map design, issolved to a certain extent; the earth observation performance of the SAR system is effectively ensured; and the signal to noise ratio is ensured.

Description

technical field [0001] The invention relates to the technical field of signal and information processing, in particular to a processing method for reducing the data rate of an on-board SAR satellite load. Background technique [0002] Synthetic Aperture Radar (SAR) has been widely used in military and civilian fields due to its all-weather and all-weather high-resolution earth observation capabilities, such as battlefield reconnaissance, ocean monitoring, agricultural census and topographic mapping, etc., usually SAR The radar pulse repetition frequency (Pulse Repetition Frequency, PRF) of the system is greater than the Doppler bandwidth of the system, which leads to a certain redundancy in the SAR echo data, and the data rate of the SAR system echo becomes quadratic with the increase of the radar high resolution. With the continuous improvement of people's demand for SAR image resolution, the data rate of spaceborne SAR system is increasing, and the system is facing more an...

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Application Information

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IPC IPC(8): G01S19/05G01S7/40
CPCG01S7/4052G01S19/05
Inventor 路瑞峰刘艳阳侯雨生张丙良巩彪曹岸杰魏春
Owner SHANGHAI SATELLITE ENG INST
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