Frequency scaling imaging method for bistatic frequency-modulated continuous wave synthetic aperture radar

Abstract

The invention discloses a frequency scaling imaging method for a bistatic frequency-modulated continuous wave synthetic aperture radar, which particularly comprises the following steps: (1) acquiring an echo signal and performing preprocessing; (2) performing frequency modulation elimination on the echo signal and eliminating a residual video phase; (3) performing complement range migration correction on the echo signal in which the residual video phase is eliminated; (4) performing secondary distance compression, consistent range migration correction and position offset correction on the echo signal after complement range migration correction; (5) performing azimuth compression; and (6) performing Fourier transform on the signal azimuth for obtaining a final focused image. On condition that no interpolation operation is performed, the frequency scaling imaging method has functions of realizing accurate focusing for original data of the bistatic frequency-modulated continuous wave synthetic aperture radar (SAR), setting a problem of large computation amount in interpolation, and improving processing speed.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an imaging method of a bistatic frequency modulated continuous wave SAR in the synthetic aperture radar (Synthetic Aperture Radar, SAR) frequency scaling imaging technology. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar, which uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. Synthetic aperture radar has played an increasingly important role in military reconnaissance, terrain mapping, vegetation analysis, marine and hydrological observation, environmental and disaster monitoring, resource exploration, and detection of crustal micro-changes. [0003] Bistatic SAR is a new radar system. The system transmitting station and receiving station are located on different platforms. The characteristics of the transmit...

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Literature "Y.Liu, Y.K.Deng, R.Wang, and O.Loffeld, Bistatic FMCW SAR signal model and imaging approach, Aerospace and Electronic Systems, IEEE Transactions on, vol.49, no.3, pp.2017–2028, 2013." In the case of considering the instantaneous slope range change, a bistatic frequency modulation continuous wave SAR range-Doppler domain imaging algorithm is proposed, but this method uses a large number of interpolation operations to achieve range migration correction, which is slow and efficient. Low

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