Single-channel HRWS-SAR imaging method based on pulse phase encoding

Abstract

The invention discloses a single-channel HRWS-SAR imaging method based on pulse phase encoding, which mainly solves the contradiction between high resolution and wide swath in the existing single-channel SAR system. The single-channel HRWS-SAR imaging method comprises the steps of: configuring parameters of an SAR system, and ensuring that range ambiguity only appears once within a main beam illumination range; performing phase encoding on a transmitted pulse signal; decoding an entire echo signal; transforming the entire echo signal after decoding into a range-Doppler domain, and extracting an unambiguous echo signal and an ambiguous echo signal in the range-Doppler domain; and forming an image of an unambiguous region by utilizing the extracted unambiguous echo signal, and forming an image of an ambiguous region by utilizing the extracted ambiguous echo signal. The single-channel HRWS-SAR imaging method based on pulse phase encoding breaks through the constraints of the minimum antenna area on the single-channel SAR system, has low system complexity, requires few space resources, is easy in real-time processing, and can be applied to terrain mapping, environment and disaster monitoring, geological exploration, marine monitoring and investigation.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a single-channel high-resolution wide-swap HRWS synthetic aperture radar (SAR) imaging method, which can be used for terrain surveying and mapping, environment and disaster monitoring, geological detection, ocean monitoring and investigation. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar with two-dimensional high-resolution capability. By transmitting a large-bandwidth signal, after pulse compression, it can obtain high resolution in the distance; relying on the relative motion between the radar and the target to form a large Synthetic aperture, after coherent processing, achieves high resolution in azimuth. SAR has all-weather, all-time and long-distance information acquisition capabilities, and can complete tasks that are difficult for optical radar and infrared radar in complex environments, such as wide surveying swa...

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Problems solved by technology

However, the implementation system of this method not only needs to solve the problem of inconsistent amplitude and phase between channels, but also needs to deal with the error problem caused by signal separation. At the same time, the complexity of the system is too high to realize real-time processing.

[0006] In their paper "Unambiguous SAR signal reconstruction from nonuniform displaced phase center sampling" (IEEE Geoscience and RemoteSensing Letters), G. Krieger et al. proposed a high-resolution viewing swath imaging method, which uses multi-dimensional encoded signals combined with digital beamforming However, this method is difficult to implement in practical applications due to the limitation of hardware conditions and waveform design.

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