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SAR imaging method based on the LFM-PC composite modulation signal and polar coordinate format algorithm

A technology of polar coordinate format and compound modulation, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve the problems of not being able to use PFA imaging, poor anti-interference performance, etc., and achieve Doppler tolerance Improve and overcome the effect of poor anti-interference performance

Inactive Publication Date: 2017-08-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The traditional SAR imaging method based on LFM signal and polar coordinate format algorithm can achieve good imaging effect, but the anti-interference performance is poor
The phase-encoded signal is sampled differently than a smoothed LFM signal within one pulse, and thus cannot be imaged with a PFA

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  • SAR imaging method based on the LFM-PC composite modulation signal and polar coordinate format algorithm
  • SAR imaging method based on the LFM-PC composite modulation signal and polar coordinate format algorithm
  • SAR imaging method based on the LFM-PC composite modulation signal and polar coordinate format algorithm

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Embodiment Construction

[0033] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0034] The invention utilizes the phase coding signal to modulate the LFM signal to obtain a new composite modulation signal——LFM-PC signal, uses the LFM-PC signal as a radar transmission signal, and uses PFA for imaging processing. Because the phase modulation function of LFM-PC signal is continuous, the SAR imaging method based on LFM-PC signal and polar coordinate format algorithm is feasible. At the same time, the Doppler tolerance of the LFM-PC signal is greatly improved compared with the phase-encoded signal, so good imaging effects can still be obtained at small oblique angles of view.

[0035] All steps of the present invention, conclusion are verified correctly...

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Abstract

The invention discloses an SAR imaging method based on the LFM-PC composite modulation signal and polar coordinate format algorithm, which uses the phase coded signal modulated LFM signal to obtain a new composite modulation signal of LFM-PC signal wherein the LFM-PC composite modulation signal is used as a radar transmitting signal and PFA is used for imaging processing. As the phase modulation function of LFM-PC signal obtained from the phase coded signal modulated LFM signal is continuous, the SAR imaging method based on the LFM-PC composite modulation signal and polar coordinate format algorithm becomes feasible. At the same time, the Doppler tolerance of LFM-PC signal is greatly improved compared with the phase coded signal. Therefore, the invention can achieve a good imaging effect and good an anti-interference performance under small inclined perspective.

Description

technical field [0001] The invention relates to a synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging processing method, in particular to a SAR imaging method based on an LFM-PC composite modulation signal and a polar coordinate format algorithm, and belongs to the technical field of radar imaging. Background technique [0002] SAR obtains target information through imaging, and is an important means of earth observation and space reconnaissance. Since it was first proposed in the 1950s, it has developed rapidly and played an important role in both military and civilian fields. In terms of civilian use, SAR can be used for surface mapping, ocean monitoring, and disaster observation; in terms of military use, SAR can be used for battlefield reconnaissance and target identification. [0003] Linear Format Modulation (LFM) signals, Non-linear Format Modulation (NLFM) signals, phase-encoded signals and chaotic signals are several common radar signals. At present, ...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S13/32G01S7/02
CPCG01S7/023G01S13/325G01S13/9017
Inventor 张劲东吴悦贾逸群张杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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