Frequency Domain Synthetic Aperture Radar Imaging Method

Abstract

The invention provides a frequency domain synthetic aperture radar imaging method. The method comprises steps: A, after down conversion and demodulation are sequentially carried out on echo signals received by the synthetic aperture radar, a signal s (ta, tr) is obtained through sampling, two-dimensional Fourier transform is carried out on the signal s (ta, tr), and a signal S (fa, fr) is obtained; B, the signal S (fa, fr) and a radar system working reference signal HRF (fa, fr) are multiplied, and a signal S1 (fa, fr) is obtained; C, stolt transform is carried out on the signal S1 (fa, fr) according to a set interpolation algorithm, and a signal S2 (fa, f'r) is obtained, wherein the f'r is a new distance frequency variable; and D, after two-dimensional inverse Fourier transform is carried out on the signal S2 (fa, f'r), the signal and an interpolation error compensation function corresponding to the set interpolation algorithm are multiplied, and a high-precision synthetic aperture radar image sI (ta, tr) is obtained. The method of the invention can meet requirements of reducing the computational complexity, reducing the operation quantity, improving the imaging precision and the like by the frequency synthetic aperture radar imaging.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to a frequency domain synthetic aperture radar imaging method. Background technique [0002] Synthetic Aperture Radar (SAR) is a microwave imaging remote sensing device that works in active detection mode. SAR is loaded on moving platforms such as aircrafts and satellites. As the platform moves, it transmits detection signals and receives target echo signals. By comprehensively processing a series of received signals, it is equivalent to a large-aperture antenna for transmission and reception. High-resolution target detection is realized by means of the received signal, and this technology is called aperture synthesis technology. [0003] Synthetic aperture radar has long detection distance, wide imaging area and high resolution, and can work around the clock. It has a wide range of applications in resource census, surveying and mapping, marine environmental inves...

AI Technical Summary

Problems solved by technology

The CS method avoids interpolation operations, but it brings problems such as increased processing steps, multiple transposition storage, and approximate errors in the processing model, which increases the complexity and limitations of processing.

[0006] In the continuous practice process, the application found that in the existing SAR imaging methods, there are problems such as low precision, complex calculation processing, and large amount of calculation.

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