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Synthetic aperture radar wide swath imaging method

A technology of synthetic aperture radar and wide swath, applied in measurement devices, radio wave measurement systems, reflection/re-radiation of radio waves, etc., can solve problems affecting swath width, poor focusing performance at swath edges, and monotonous phase error. increase and other problems, to achieve the effect of taking into account imaging efficiency and focusing performance, increasing the width of the surveying swath, and reducing the phase error

Pending Publication Date: 2022-07-08
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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Problems solved by technology

In addition, the phase error of the imaging results obtained based on Taylor series expansion will monotonically increase as the distance from the center point increases. At this time, the focusing performance at the edge of the swath becomes worse, which affects the width of the swath.

Method used

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  • Synthetic aperture radar wide swath imaging method

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Embodiment Construction

[0034] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0035] The invention provides a fast imaging method for a wide swath of a low-frequency ultra-wideband synthetic aperture radar. The fast imaging method based on NCS replaces the phase approximation based on the Taylor formula expansion, and uses the Legendre expansion based on the replacement of the phase approximation. The phase approximation method based on the method increases the swath width and achieves good focusing at the edge of the swath. The implementation flow chart of the present invention is as follows figure 1 shown, including the following steps:

[0036] Step S1, performing a two-dimensional FFT on the radar echo, as follows:

[0037] Suppose the radar echo is in where x 0 ,r 0 are the azimuth coordinates and the nearest slant distance of the target from the radar, respectively; T p ,f 0 , K, τ are the signal pulse width, cent...

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Abstract

The synthetic aperture radar wide swath imaging method provided by the invention can realize wide swath imaging, gives consideration to imaging efficiency and focusing performance, and is suitable for low-frequency UWB-SAR. According to the fast imaging method for the wide swath of the low-frequency-band ultra-wideband synthetic aperture radar, the fast imaging method based on the NCS is provided, the original phase approximation based on a Taylor formula expansion is replaced, a phase approximation method based on a Legendre expansion is used, the width of the swath is increased, and the imaging efficiency is improved. Good focusing at the edge of a surveying and mapping band is realized.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to an imaging method for a wide swath of synthetic aperture radar. Background technique [0002] Ultra-Wideband Synthetic Aperture Rader (UWB-SAR) is a new type of radar with two-dimensional high resolution capability. UWB-SAR basically works in the low frequency band, and the electromagnetic waves in this band can penetrate clouds, leaf clusters and shallow surfaces, so as to carry out high-resolution reconnaissance and detection of hidden targets. Therefore, UWB-SAR is an important reconnaissance tool in the modern military field, and can also play a major role in civil fields such as environmental resource survey and terrain mapping. [0003] The commonly used synthetic aperture radar imaging algorithms are divided into two categories: precise imaging algorithms and approximate imaging algorithms. An accurate imaging algorithm means that no assumption is made a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9021G01S7/41
Inventor 田卫明谢鑫胡程邓云开董锡超
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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