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Multichannel synthetic aperture radar imaging method based on complete complementary sequence

A completely complementary sequence and synthetic aperture radar technology, applied in the field of signal processing, can solve problems such as inability to directly compensate azimuth phase, limit applications, and inability to complete distance compression, achieving high resolution, high resolution, and small sidelobe interference Effect

Inactive Publication Date: 2013-09-18
BEIHANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, due to the multi-channel system, the signals received by each channel are aliased in the azimuth frequency domain, and the azimuth phase cannot be directly compensated, so the distance compression in the imaging process cannot be completed.
These shortcomings limit the application of fully complementary sequences in multi-channel synthetic aperture radar

Method used

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  • Multichannel synthetic aperture radar imaging method based on complete complementary sequence
  • Multichannel synthetic aperture radar imaging method based on complete complementary sequence
  • Multichannel synthetic aperture radar imaging method based on complete complementary sequence

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Embodiment

[0143] This embodiment proposes a multi-channel synthetic aperture radar imaging method based on a complete complementary sequence, where the parameters involved in the imaging process are shown in Table 1.

[0144] Table 1 embodiment parameters

[0145]

[0146] This embodiment specifically includes the following steps:

[0147] Step 1: The echo data C based on the complete complementary sequence signal waveform (i) (i=1, 2, 3) are divided into echo data obtained by using sequence A and sequence B as radar transmission signals alone and

[0148] Specifically:

[0149] and It is also a two-dimensional complex array with a size of 256×2048. According to formulas (4) and (5), we can get and (i=1, 2, 3).

[0150] Step 2: Echo data and Perform distance to Fourier transform;

[0151] Specifically:

[0152] For the echo data separated in step 1 and Do Fast Fourier Transform (FFT) along the distance direction, that is, for and One-dimensional Fourier ...

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Abstract

The invention discloses a multichannel synthetic aperture radar imaging method based on a complete complementary sequence. The multichannel synthetic aperture radar imaging method includes following steps: 1, dividing echo data of various channels based on the complete complementary sequence into echo data which are obtained by means of utilizing two complementary sequences as radar transmitting signals independently; 2, performing azimuth Fourier transformation for the separated echo data; 3, performing azimuth spectral reconstruction; 4, performing range compressing; 5, correcting range migratory motion; and 6, performing azimuth compressing to obtain a final image. The multichannel synthetic aperture radar imaging method has the advantages that radar signal waveforms are easy to be generated, pulse compressing is easy to be realized, azimuth ultralow sidelobe is realized, azimuth resolution, image quality and orientation resolution are high, and an observation band is wide.

Description

technical field [0001] The invention relates to a multi-channel synthetic aperture radar imaging method based on a complete complementary sequence, belonging to the technical field of signal processing. Background technique [0002] Synthetic Aperture Radar (SAR) is a device that uses microwave radar to observe the earth. It is an earth observation system with all-weather and all-weather observation capabilities. At present, improving the image quality and improving the earth observation capability of SAR are important goals pursued by the development of the current SAR system. However, the SAR system of the traditional system has the following two shortcomings. On the one hand, the traditional SAR system uses the linear frequency modulation signal as the radar transmission signal. Due to the inherent characteristics of the linear frequency modulation signal, the final image will be subject to strong sidelobe interference, which will affect the image quality. In actual ima...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 陈杰朱燕青杨威王鹏波李卓李春升
Owner BEIHANG UNIV
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