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Method for detecting ground moving target of high-orbit platform

A ground moving target and detection method technology, applied in the field of radar moving target detection, can solve problems such as difficulty in moving target detection, and achieve the effects of strong continuous observation ability, short revisit period and wide irradiation range

Inactive Publication Date: 2019-03-01
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, a method for detecting ground moving objects on a high-orbit platform provided by the present invention solves the problem that spaceborne SAR is difficult to continuously detect moving objects on ground

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  • Method for detecting ground moving target of high-orbit platform
  • Method for detecting ground moving target of high-orbit platform
  • Method for detecting ground moving target of high-orbit platform

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Embodiment Construction

[0044] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0045] like figure 1 As shown, a high-orbit platform ground moving target detection method includes the following steps:

[0046] S1. Send a signal to the target through the front channel, and receive the echo through the front and rear channels at the same time.

[0047] S2. Estimate the Doppler frequency and modulation frequency of the echo signal by using the fractional Fourier transform to obtain the estimated echo signa...

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Abstract

The invention discloses a method for detecting a ground moving target of a high-orbit platform. An along-track interferometric (ATI) method is applied to the high-orbit platform. The ground moving target is detected by using a polynomial distance model-based RD algorithm in combination with a function of estimating the Doppler frequency and the modulation frequency using fractional Fourier transform (FrFT). Compared with a low-orbit satellite-borne SAR system, the high-orbit platform of the present invention has a wide illumination range, a short revisit period, and a good continuous observation capability. A double threshold detection method is used to achieve a good clutter suppression effect in a weak clutter region. Furthermore, the method can detect a plurality of moving targets in aground observation scenario.

Description

technical field [0001] The invention relates to the field of radar moving target detection, in particular to a method for detecting ground moving targets on high-rail platforms. Background technique [0002] There are many methods to realize Synthetic Aperture Radar (SAR) Ground Moving Target Detection (GMTI), mainly including single-channel and multi-channel methods. Among them, the single-channel method is simple to implement, but its ability to suppress clutter is weak; the multi-channel method uses the correlation of echoes between multiple channels to suppress the echoes generated by stationary targets, so that moving targets can be preserved. , and further estimate the parameters of the moving target. [0003] At present, the airborne SAR ground moving target detection technology is relatively mature. In order to achieve long-term and large-scale observation, spaceborne SAR is gradually developing. Low-Earth orbit satellites generate SAR images through continuous obse...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 曹建蜀田昊宇
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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