Azimuth Signal Preprocessing Method for Single-Phase Central Multi-beam Synthetic Aperture Radar
A synthetic aperture radar, multi-beam technology, applied in the field of radar, can solve the problem of no signal processing method
Active Publication Date: 2010-04-14
INST OF ELECTRONICS CHINESE ACAD OF SCI
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The working mode of the aperture radar is adopted, and there is no signal processing method specially for this new system at present.
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[0042] The orientation signal processing needs to be performed in the frequency domain. Assuming that the orbital inclination of the satellite is greater than 90°, the right side of the antenna depends on the situation
[0043] fdc=(-2 / λRc) [V (Rs-Rt)+ωe (Rs×Rt)] (7)
[0046] 2. spectrum broadening: at the end of each beam spectrum, the zero-padding extension length is original NB=3 times.
[0051] After the frequency shift, the azimuth spectrum of each beam is shown in the cross shaded part in Fig. 4(a).
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The invention relates to the technical field of radar, and belongs to a synthetic aperture radar signal processing method, in particular to an azimuth signal preprocessing method. The azimuth spectrum of each sub-beam echo of the single-phase central multi-beam synthetic aperture radar system is sampled by the pulse repetition frequency (PRF) and partially overlaps with each other on the frequency axis, which can be processed in the frequency domain, using FFT frequency shifting and other means, Synthesize a broad Doppler spectrum. The azimuth echo data with a wider Doppler bandwidth is synthesized after being processed by the signal processing method, so that the azimuth resolution can be improved after azimuth compression processing.
Description
Single-phase central multi-beam synthetic aperture radar azimuth signal preprocessing method Technical field The present invention relates to technical field of radar, belong to synthetic aperture radar signal processing, at a kind of synthetic aperture radar The new system—single-phase central multi-beam synthetic aperture radar, proposes an azimuth signal preprocessing method for this new system It provides a design reference for the engineering of the control system. Background technique Synthetic Aperture Radar (SAR) can realize the observation of the earth's surface all-weather and all-weather, obtain ground target High-resolution images have broad application prospects in the fields of national economy and national defense. Spaceborne synthetic aperture radar system design A fundamental limitation in the calculation is the conflict between the mapping bandwidth and the azimuth resolution, which arises from their influence on the system pulse. Different require...
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IPC IPC(8): G01S13/90
Inventor 李世强杨汝良
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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