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Waveform design method of a high-resolution wide-width SAR based on pitch-dimensional frequency intra-pulse scanning

A waveform design and pitch-dimensional technology, which is applied in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve problems such as limitations and engineering implementation difficulties

Active Publication Date: 2020-06-09
XIDIAN UNIV
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Problems solved by technology

However, the beam control of the above method is discrete beam control from sub-pulse to sub-pulse, which requires fast phase transformation between sub-pulses, and there are difficulties and limitations in engineering implementation.

Method used

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  • Waveform design method of a high-resolution wide-width SAR based on pitch-dimensional frequency intra-pulse scanning
  • Waveform design method of a high-resolution wide-width SAR based on pitch-dimensional frequency intra-pulse scanning
  • Waveform design method of a high-resolution wide-width SAR based on pitch-dimensional frequency intra-pulse scanning

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0061] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0062] Step 1) Set input parameters:

[0063] According to the SAR imaging index requirements, set the SAR imaging swath size to W and the distance resolution to ρ r , the azimuth resolution is ρ a , the near-end incidence angle of the swath The height and velocity of the SAR platform are H and V, respectively. In this embodiment, the imaging swath size W=100km is set, and the distance resolution ρ r =0.75m, azimuth resolution ρ a = 0.75m, incident angle near the survey zone The height and speed of the SAR platform are H=600km and V=7500m / s, respectively.

[0064] Step 2) Construct the transmit antenna array Z:

[0065] Constructing the transmitting antenna array Z=[z of periodically arranged N transmitting antennas 1 ,z 2 ,…,z ...

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Abstract

The invention provides a waveform design method of a high-resolution wide-width SAR based on pitch-dimensional frequency intra-pulse scanning. The objective of the invention is to complete waveform design of a single-channel high-resolution wide-width SAR through a pitch-dimensional frequency intra-pulse scanning technology. The method comprises the following implementation steps: setting input parameters; constructing a transmitting antenna array; synthesizing a transmitted waveform; extracting a time-space directional diagram of a pitch-dimensional frequency intra-pulse scanning signal in the transmitted waveform; calculating the instantaneous beam pointing angle of the time-space directional diagram; calculating the number of transmitting antennas of the transmitting antenna array; calculating the signal bandwidth of the transmitted signal; calculating the center frequency of the transmitting signal and the time delay between the adjacent transmitting antennas; and obtaining the waveform design result of the high-resolution wide-width SAR scanned in the pitch-dimensional frequency pulse. According to the method, the transmission waveform is designed to control the instantaneousbeam pointing angle of the synthetic directional diagram to realize intra-pulse beam continuous scanning, spatial filtering is equivalently realized by utilizing frequency domain filtering to completerange ambiguity suppression, and engineering implementation is relatively simple.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to a waveform design method of a high-resolution wide-range SAR, in particular to a waveform design method of a high-resolution wide-range SAR based on pitch-dimensional frequency intrapulse scanning. Background technique [0002] Synthetic Aperture Radar (SAR) is widely used in military and civil fields because of its all-day and all-weather imaging characteristics of ground scenes. In some application scenarios, such as global dynamic observation, ground object classification and recognition, etc., SAR is required to have high resolution and wide imaging capabilities. However, in traditional SAR imaging, high resolution and wide swath are a pair of contradictions due to the opposite requirements for pulse repetition frequency PRF. High resolution requires a long synthetic aperture time, and the formed Doppler bandwidth is large enough. In order to avoid azimuth ambi...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9011G01S13/9094G01S7/414G01S7/418
Inventor 刘楠葛改陈元元张林让
Owner XIDIAN UNIV
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