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Waveform design method of two-dimensional scanning high-resolution wide-width SAR based on azimuth frequency scanning

A waveform design and two-dimensional scanning technology, applied in high-resolution wide-format imaging, two-dimensional scanning high-resolution wide-format SAR waveform design, and high-resolution wide-format SAR waveform design field, which can solve the problem of large number of devices and large number of channels. , unfavorable engineering implementation and other problems, to achieve the effect of less receiving channels, less equipment, and increased width

Inactive Publication Date: 2021-06-25
XIDIAN UNIV
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Problems solved by technology

With the continuous improvement of the requirements for resolution and imaging width, SAR uses multi-dimensional waveform coding signals to achieve high-resolution and wide-width imaging, and the number of channels required will become larger and larger, which is not conducive to engineering realization.

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  • Waveform design method of two-dimensional scanning high-resolution wide-width SAR based on azimuth frequency scanning
  • Waveform design method of two-dimensional scanning high-resolution wide-width SAR based on azimuth frequency scanning
  • Waveform design method of two-dimensional scanning high-resolution wide-width SAR based on azimuth frequency scanning

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Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0044] Step 1) Set the parameters of the synthetic aperture imaging radar SAR:

[0045] The antenna array Z=[z of N antennas arranged at equal intervals is set to comprise the synthetic aperture imaging radar SAR 1 ,z 2 ,…,z n ,…,z N ], each antenna z n The azimuth dimension is connected with a time delay line TTD for realizing azimuth frequency sweep n , the distance and time delay in the azimuth dimension between adjacent antennas are d and τ, z n The time delay is All antennas use the same transmit signal The pulse repetition frequency of the transmitted signal is F r , the height and velocity of the SAR platform are H and V respectively, the pitch-dimensional mapping bandwidth of SAR imaging is W, and the incident angl...

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Abstract

The invention provides a waveform design method of a two-dimensional scanning high-resolution wide-width SAR based on azimuth frequency scanning. The method comprises the following implementation steps: setting parameters of a synthetic aperture imaging radar SAR; calculating a transmitted waveform of the antenna array; calculating a time-space directional diagram of the transmitted waveform; calculating an instantaneous beam directional angle of the time-space directional diagram; drawing a zebra map and dividing the zebra map; calculating a wave beam scanning range of a transmitted waveform in an azimuth frequency scanning mode; calculating azimuth dimension time delay and frequency modulation rate according to the beam scanning range; and obtaining a waveform design result of the two-dimensional scanning high-resolution wide-width SAR of azimuth frequency scanning. According to the invention, the fuzzy suppression can be realized by equivalently replacing DBF spatial filtering with frequency spectrum shift under a single channel, the defect that fuzzy suppression is realized by depending on a multi-channel system and a DBF technology in the prior art is overcome, and engineering realization is facilitated; the surveying and mapping band is divided in a pitching dimension, the width of the surveying and mapping band can be increased, and high-resolution wide-width imaging is achieved through two-dimensional scanning.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a waveform design method for high resolution and wide range SAR, in particular to a waveform design method for two-dimensional scanning high resolution and wide range SAR based on intrapulse azimuth dimension frequency scanning, which can be used for SAR Achieve high-resolution wide-format imaging. Background technique [0002] Synthetic Aperture Radar (SAR) is an active Earth observation system that can be installed on aircraft, satellites and other flight platforms to conduct ground-to-ground observations all-weather and all-weather. In application scenarios such as global dynamic observation, ground object classification and recognition, SAR is required to have the imaging capability to achieve high resolution and wide width. Traditional SAR imaging modes include strip mode, spotlight mode and scan mode. The transmitted signal waveforms used in traditional SAR ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9054G01S13/9056G01S13/9094G01S7/41
Inventor 刘楠陈元元
Owner XIDIAN UNIV
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