A novel hypersonic vehicle-borne multichannel SAR-GMTI scheme based on adaptive sum and difference beams within eigenspace
| Autor: | Yunhe Cao, Jiusheng Han, Tat Soon Yeo, Shuai Liu, Wang Fengfei |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Synthetic aperture radar
Computer science 020206 networking & telecommunications 02 engineering and technology Moving target indication Azimuth symbols.namesake Control and Systems Engineering Robustness (computer science) Signal Processing 0202 electrical engineering electronic engineering information engineering Chirp symbols 020201 artificial intelligence & image processing Computer Vision and Pattern Recognition Electrical and Electronic Engineering Envelope (radar) Algorithm Doppler effect Software Energy (signal processing) |
| Zdroj: | Signal Processing. 187:108168 |
| ISSN: | 0165-1684 |
| DOI: | 10.1016/j.sigpro.2021.108168 |
| Popis: | This paper investigates a novel ground moving target indication (GMTI) scheme for a hypersonic vehicle-borne multichannel synthetic aperture radar (MC-SAR) system with Doppler ambiguity. First, after the range compression and azimuth chirp Fourier transform (CFT), by applying the eigenspace-based adaptive sum and difference beams (EASDB) on the coarse-focused images, the high-precision cross-track velocity (CTV) can be retrieved. Then, utilizing the high-precision CTV to construct an accurate moving target steering vector to extract the moving target energy. With the proposed CFT-two-step method, we have avoided cumbersome CTV search, and simplified the process of range walk correction, resulting in lower computational complexity. Compared to the CFT-center and CFT-two-step methods, the proposed scheme obtains the accurate two-dimension motion parameters of a moving target, and has better performance and robustness in the detection, focusing, and location, preserving the moving target envelope and achieving higher signal-to-clutter-and-noise ratio (SCNR). Finally, using the processing results of simulation and real measured MC-SAR data, we verify the effectiveness and feasibility of our proposed scheme. |
| Databáze: | OpenAIRE |
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