A signal processing method for multi-transmit and multi-receive synthetic aperture lidar

Abstract

The invention provides a multiple-input multiple-output synthetic aperture ladar (SAL) signal processing method, which can effectively solve the conflict between an azimuth high resolution and a range direction wide swath, and realize high resolution wide swath SAL imaging. The method comprises the steps of: N array elements respectively receiving target echo signals, each array element performing residual video phase compensation processing and form simplification processing on the target echo signals; each array element performing Fourier transform of azimuth on the target echo signals after form simplification processing; performing solving ambiguity processing on observation vectors formed by target echo Doppler signals mixed by the N array elements; and arranging elements of target echo Doppler signal vectors without fuzziness according to fuzzy component numerical magnitudes, and employing a Doppler frequency spectrum to splice complete target echo Doppler signals without fuzziness, thereby obtaining an SAL image.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a multi-transmit and multi-receive synthetic aperture laser radar signal processing method. The invention can be used for high-resolution and wide-swath synthetic aperture lidar imaging. Background technique [0002] High-resolution earth observation requires higher resolution, longer observation distance, and larger mapping bandwidth, and it is developing towards the direction of multiple sensors working together. Synthetic Aperture Lidar (Synthetic Aperture Ladar, SAL) and microwave synthesis Aperture Radar (Synthetic Aperture Ladar, SAR) has very good complementary characteristics. SAR can be used for census of large-scale areas, and then for interested target facilities, SAL can be used for higher-resolution observations. SAL is a necessary supplementary method to the current high-resolution earth observation methods. [0003] The use of SAL technology can...

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Problems solved by technology

[0004] The research on SAL technology has been included in the development plan of the national high-resolution earth observation. The Key Laboratory of Radar Signal Processing and National Defense Science and Technology of Xidian University found in the research that the single-transmit and single-receive SAL in the high-resolution mode, Its mapping bandwidth is extremely limited

Foreign research on SAL technology has carried out airborne flight tests of single-engine and single-receive SAL, and its surveying and mapping bandwidth is only 2 meters at a distance of one kilometer. Therefore, the nature of the narrow surveying and mapping bandwidth of single-engine and single-receiving SAL seriously restricts Practicality of technology

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