Orientation multichannel synthetic aperture radar imaging method based on Doppler estimation

Abstract

The invention discloses an orientation multichannel synthetic aperture radar imaging method based on Doppler estimation. The method comprises the following steps of determining that a synthetic aperture radar includes M channels, wherein the M channels of the synthetic aperture radar receive target echo signals in a detection scope respectively; then calculating equivalent phase center distances of the M channels respectively so as to calculate a two-dimensional frequency domain target echo signal S(fr, fb), and according to the respective equivalent phase center distance of the M channels, calculating and acquiring an effective Doppler bandwidth Be of the synthetic aperture radar; according to the S(fr, fb) and the Be, calculating an orientation direction channel error gamma a of the synthetic aperture radar and an orientation direction channel error estimation value of the synthetic aperture radar; and using the orientation direction channel error estimation value and the S(fr, fb) to carry out error correction, calculating a target echo signal after the error correction is performed on the channel and carrying out ambiguity resolution processing; calculating the target echo signal after the ambiguity resolution processing and then carrying out imaging processing; and calculating synthetic aperture radar imaging of the target echo signal.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar signal processing, and in particular relates to an azimuth multi-channel synthetic aperture radar imaging method based on Doppler estimation, which is suitable for correcting errors between channels of azimuth multi-channel synthetic aperture radar, and is especially suitable for echo Error correction between channels of azimuth multi-channel synthetic aperture radar when the number of wave signal fuzzy components is unknown or varies with baseband frequency. Background technique [0002] Synthetic Aperture Radar (SAR) imaging technology has the characteristics of all-day and all-weather work, and is widely used in the field of aviation and aerospace remote sensing; However, for the traditional single-channel SAR radar, due to the limitation of the minimum antenna area, high azimuth resolution and wide range mapping are a set of contradictions that are difficult to reconcile. In ...

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Problems solved by technology

[0004] In practical applications, the number of fuzzy components often changes with the baseband frequency, and it is difficult to accurately obtain the change of the number of fuzzy components in advance; when the number of fuzzy components is inaccurate, the division of noise subspace and signal subspace will appear error, which in turn affects the orthogonality between the noise subspace and the signal subspace, resulting in inaccurate or even invalid channel error estimates

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