Ultralow sidelobe synthetic aperture radar imaging method based on complete complementary sequence

A fully complementary sequence, synthetic aperture radar technology, applied in the field of signal processing, can solve the problems of destroying the non-sidelobe characteristic of the pulse compression signal of the fully complementary sequence, poor imaging performance of the waveform of the fully complementary sequence signal, and restricting the application of the fully complementary sequence, etc. High-resolution, easy-to-achieve, easy-to-create effects

Inactive Publication Date: 2012-07-25
BEIHANG UNIV
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Problems solved by technology

This means that the azimuths and moments of the pulses formed by the two sequences are different, resulting in different delay phases, which destroys the sidelobe-free characteristic of the pulse compression signal of the complete complementary sequence
This problem leads to the fact that the imaging performance based on the complete complementary sequence signal waveform is even worse than that of the traditional chirp signal, and its advantages are not reflected at all, thus limiting the application of the complete complementary sequence in synthetic aperture radar

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  • Ultralow sidelobe synthetic aperture radar imaging method based on complete complementary sequence
  • Ultralow sidelobe synthetic aperture radar imaging method based on complete complementary sequence
  • Ultralow sidelobe synthetic aperture radar imaging method based on complete complementary sequence

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Embodiment

[0125]This embodiment proposes an ultra-low sidelobe synthetic aperture radar imaging method based on a complete complementary sequence, where the parameters involved in the imaging process are shown in Table 1.

[0126] Table 1 Example parameters

[0127]

[0128] This embodiment specifically includes the following steps:

[0129] Step 1: Divide the echo data C based on the complete complementary sequence signal waveform into the echo data C obtained by separately using sequence A and sequence B as radar transmission signals 1 and C 2 ;

[0130] C 1 and C 2 is also a two-dimensional complex array. According to formulas (3) and (4), C can be obtained 1 and C 2 .

[0131] Step 2: range pulse compression processing based on matched filtering;

[0132] Using the two complementary code sequence signals of the complete complementary sequence as reference signals, the echo data C of sequence A and sequence B are respectively 1 and C 2 Perform distance matching filterin...

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Abstract

The invention discloses an ultralow sidelobe synthetic aperture radar imaging method based on a complete complementary sequence. The ultralow sidelobe synthetic aperture radar imaging method includes steps of 1, dividing echo data based on signal waveforms of the complete complementary sequence into echo data which are obtained by means of utilizing two complementary sequences as radar transmitting signals independently; 2, compressing range pulses based on matched filtering; 3, performing azimuth Fourier transformation; 4, correcting range migratory motion; 5, performing azimuth data high-frequency zero fill; 6, shifting and adding the data after zero rill; and 7, performing azimuth compressing to obtain a final image. The ultralow sidelobe synthetic aperture radar imaging method has theadvantages that radar signal waveforms are easy to be generated, pulse compressing is easy to be realized, azimuth ultralow sidelobe is realized, and azimuth resolution and image quality are high.

Description

technical field [0001] The invention relates to an ultra-low sidelobe and high-resolution synthetic aperture radar imaging method based on a complete complementary sequence, which belongs to the technical field of signal processing. Background technique [0002] Synthetic Aperture Radar (SAR) has all-weather and all-weather earth observation capabilities, and is currently the most concerned earth observation system. Currently, image quality is one of the key factors restricting the application of SAR. Spatial resolution, side lobe ratio, and ambiguity are important indicators to measure the quality of SAR images. The traditional SAR system uses chirp signal as the radar transmission signal waveform. Under the unweighted condition, the peak side lobe ratio after range compression is about -13.2dB. In the actual imaging process, the frequency domain weighting method is usually used to suppress the side lobe, and its disadvantage is that the spatial resolution is sacrificed. ...

Claims

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Application Information

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Patent Type & Authority Applications(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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