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Rotary scanning ground-based SAR high-precision imaging scheme based on fast BP algorithm

A technology of rotary scanning and BP algorithm, which is applied in 2D image generation, calculation, image data processing, etc., can solve the problems of restricting the real-time application of BP algorithm, high computational complexity, etc. The effect of resolution

Pending Publication Date: 2022-07-26
HUNAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, compared with other algorithms, the computational complexity of the BP algorithm is extremely high, which greatly limits the real-time application of the BP algorithm in large-scale imaging occasions.

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  • Rotary scanning ground-based SAR high-precision imaging scheme based on fast BP algorithm
  • Rotary scanning ground-based SAR high-precision imaging scheme based on fast BP algorithm
  • Rotary scanning ground-based SAR high-precision imaging scheme based on fast BP algorithm

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] The basic idea of ​​the fast BP algorithm is to approximate the signal model in each modulation period, so that the processing in the radial range direction can be converted into FFT processing; Smaller (much smaller than the straight-line SAR), generally less than 2 radial range resolution unit widths (will be analyzed later), the range migration correction for each pixel point only needs to be at the close range R of the pixel point s It is carried out on the distance channel where it is located and the two adjacent distance channels, without the need to perform range migration correction in the frequency domain or large-scale accumulation across the range resolution unit in the time domain, which makes the accumulation processing in the azimuth easier to achieve.

[0024] According to the attached drawings, the azimuth...

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Abstract

The invention relates to combination of a rotary scanning ground-based SAR and a fast BP algorithm, and discloses a rotary scanning ground-based SAR high-precision imaging scheme based on the fast BP algorithm. According to the scheme, firstly, an azimuth phase history function and the number of pulse periods needed by cross-resolution unit movement are calculated according to gridded elevation auxiliary data and are stored in a data file in a three-dimensional array mode; secondly, echo signal sampling data of a monitoring area are recorded through arc rotation scanning, and for each modulation period, FFT is adopted to carry out spectral analysis on the data and shift arrangement is carried out on a frequency spectrum to obtain the frequency spectrum; and for each pixel point, coherent accumulation and cross-resolution unit distance migration correction processing are carried out in the azimuth direction, and finally an arc SAR image of the monitoring area is obtained. According to the invention, the fast BP algorithm has low operand and memory space, has good adaptation under the condition of large-distance migration, can cover a surrounding 360-degree large-range scene in one-time observation in combination with the rotation scanning SAR, and has high efficiency and wider application.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a high-precision imaging solution for ground-based SAR by rotating scanning based on a fast BP algorithm. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution radar that uses pulse compression technology in the range direction and synthetic aperture technology in the azimuth direction to obtain a high-resolution image of the target. It can carry out all-weather, all-weather earth observation, and can penetrate the surface and vegetation to obtain subsurface information at a specific frequency, so it has a wide range of applications in geological survey, remote sensing imaging and deformation detection, target recognition and other fields. Ground-based synthetic aperture radar (GB-SAR) integrates the SAR imaging principle and electromagnetic wave interference technology, and uses the system parameters of the sensor, the geom...

Claims

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Application Information

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IPC IPC(8): G01S13/90G06T11/00G06T17/05
CPCG01S13/9094G06T11/003G06T17/05
Inventor 王秀婷何松华
Owner HUNAN UNIV