Coding and Decoding Method of Synthetic Aperture Radar
A technology of synthetic aperture radar and encoding and decoding method, which is applied in the field of encoding and decoding of synthetic aperture radar, which can solve problems such as ambiguity in azimuth, ambiguity, and inability to select PRF values, and achieve the effect of reducing difficulty and improving efficiency
Active Publication Date: 2021-06-04
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0005] Therefore, for a synthetic aperture radar installed on an aircraft with a speed of 300m / s, to achieve a range of 250km, the traditional method cannot select a suitable PRF value to ensure neither range nor azimuth ambiguity
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[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0034] Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to ...
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The present invention provides a synthetic aperture radar encoding and decoding method, which comprises the following steps: S1, modulating the transmitting signal according to the farthest operating distance of the synthetic aperture radar and the pulse width of the transmitting signal, so as to realize multi-phase encoding of the transmitting signal; and S2. Perform low-pass filtering on the echo signal corresponding to the transmitted signal to realize polyphase decoding of the echo signal, wherein the polyphase encoding and polyphase decoding can suppress azimuth ambiguity and range ambiguity of the synthetic aperture radar. According to the encoding and decoding method of the present invention, the utilization rate of the transmission power of the synthetic aperture radar is relatively high, and while solving the ambiguity of the azimuth direction and the range direction caused by the high-speed and long-range action distance, it reduces the pressure of subsequent signal processing, making the high-speed platform The advanced synthetic aperture radar can obtain images at a long range, while avoiding the problems of range and azimuth ambiguity caused by it.
Description
technical field [0001] The invention relates to the field of radar waveform design, in particular to a coding and decoding method for synthetic aperture radar. Background technique [0002] The large-scale synthetic aperture radar system with long action range applied to high-speed platforms is an important development direction of synthetic aperture radar, and the problem faced by this large-scale synthetic aperture radar system is how to ensure the long-range action and large mapping width of the radar Under the premise, the azimuth and range ambiguities are suppressed. [0003] The high-speed operation of the platform will make the azimuth Doppler bandwidth very large. For example: X-band radar (center frequency: 9.5GHz, wavelength: 0.03m) is installed on an aircraft with a flight speed of 300m / s, and the antenna azimuth beamwidth is 2 °, the azimuth bandwidth of the echo signal generated at this time is 698Hz; if the speed of the aircraft is 60m / s, the corresponding ech...
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IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 李和平王岩飞徐向辉朱建光赵达伟
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI