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An azimuth NCS imaging method, system, medium and device based on azimuth deramp

An imaging method and azimuth technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., to achieve high-precision focusing and high-efficiency processing requirements

Active Publication Date: 2022-07-15
BEIJING INST OF RADIO MEASUREMENT
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  • Application Information

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Problems solved by technology

The azimuth NCS processing is performed on the signal before the azimuth pulse pressure, and it is not suitable for the azimuth coarse focus data processing after the azimuth deramp processing

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  • An azimuth NCS imaging method, system, medium and device based on azimuth deramp
  • An azimuth NCS imaging method, system, medium and device based on azimuth deramp
  • An azimuth NCS imaging method, system, medium and device based on azimuth deramp

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Embodiment Construction

[0023] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

[0024] figure 1 A flowchart of an azimuth deramp-based azimuth NCS imaging method provided in an embodiment of the present invention, as shown in figure 1 As shown, the method includes:

[0025] S1. Perform azimuth deramp processing on the range frequency domain-azimuth time domain signal after range pulse pressure and movement correction;

[0026] Let the speed of light be c and the carrier frequency be f c , the distance frequency is f r , the modulation frequency is γ, is an imaginary unit, is the distance dimension time, t m is the azimuth dimension time.

[0027] The range frequency domain and azimuth time domain signal expressions after range pulse pressure and ambulatory correction are:

[0028]

[0029] according to...

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Abstract

The invention relates to an azimuth NCS imaging method, system, medium and equipment based on azimuth deramp. The method comprises: performing azimuth deramp processing on the distance frequency domain-azimuth time domain signal after range pulse pressure and movement correction; After the processed range frequency domain-azimuth time domain signal is transformed into a two-dimensional frequency domain signal, the azimuth defocusing process is performed; The SAR image is obtained by standard processing. The invention combines the two processing technologies of azimuth deramp and azimuth NCS well, so that it can process large rotation angle (high resolution) and large strabismus spotlight SAR data, and takes into account the requirements of high-precision focusing and high-efficiency processing.

Description

technical field [0001] The invention relates to a synthetic aperture radar azimuth imaging method, in particular to an azimuth deramp-based azimuth NCS imaging method, system, medium and equipment. Background technique [0002] In Spotlight SAR (Synthetic Aperture Radar), high azimuth resolution is obtained by using a large beam rotation angle, and the azimuth equivalent bandwidth is generally larger than the pulse repetition frequency, and the azimuth spectrum is often removed by azimuth deramp processing. After stacking and azimuth deramping, a coarsely focused SAR image is obtained. In spotlight SAR, there are not only large turning angles, but also large squints. The azimuthal focus depth is limited under large squints, manifesting as defocused images of objects that are off-center of the azimuthal scene. An effective solution is to use azimuth NCS (Nonlinear Chirp Scaling, nonlinear frequency modulation scaling) processing, that is, through scaling of the azimuth phas...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41G01S7/295
CPCG01S7/295G01S7/41G01S13/9011G01S13/9041
Inventor 邢涛李军韦立登王新民
Owner BEIJING INST OF RADIO MEASUREMENT