Research Article
Space-Borne Passive Location Based on a Virtual Synthetic Aperture Mechanism
@INPROCEEDINGS{10.1007/978-3-030-93398-2_52, author={Tong Zhang and Qiang Yang and Xin Zhang and Xiaochuan Wu}, title={Space-Borne Passive Location Based on a Virtual Synthetic Aperture Mechanism}, proceedings={Wireless and Satellite Systems. 12th EAI International Conference, WiSATS 2021, Virtual Event, China, July 31 -- August 2, 2021, Proceedings}, proceedings_a={WISATS}, year={2022}, month={1}, keywords={Passive location Virtual aperture Range-azimuth location Space-borne single platform}, doi={10.1007/978-3-030-93398-2_52} }- Tong Zhang
Qiang Yang
Xin Zhang
Xiaochuan Wu
Year: 2022
Space-Borne Passive Location Based on a Virtual Synthetic Aperture Mechanism
WISATS
Springer
DOI: 10.1007/978-3-030-93398-2_52
Abstract
The passive location method based on space-borne phase interferometer has to design more complex structures of antenna and system to solve the conflict between phase ambiguity and location accuracy. To address the problem, a space-borne passive location method based on virtual aperture is proposed in this paper. This method utilizes the moving characteristics of the space-borne platform to apply the principles of the synthetic aperture into the virtual aperture passive location system to form a new strategy of direction finding and location. We use the equivalent squint range model (ESRM) as the range model and the parameters of the model are estimated by Doppler parameter inversion and geometric approximation. Based on the range model, the received signal is equivalent to a linear frequency modulated signal in the azimuth direction, thus the azimuth location can be completed by matched filtering, while the range location can be completed by range searching. The 2-D coordinates of the radiation source can be obtained by range searching and azimuth focusing.
