Abstract
The problem of single-channel reception of global positioning system (GPS) communication waveforms makes passive sensing of aerial target difficult because of forward scatter. This paper proposes a novel aerial target passive sensing method based on linear canonical transformation (LCT) using the forward scattered satellite communication waveforms. The proposed method firstly preprocesses the received signal based on the characteristics of the traditional satellite tracking loop and the forward scattered satellite communication waveforms to effectively suppress the interference of the direct wave through DC removal. Then, the Gaussian noise and multipath interference in the channel are suppressed by applying a rectangular window to its linear canonical domain. Finally, aerial target sensing is performed based on the peak value of signals in the linear canonical transform domain. The characteristic signal is constructed by analyzing the satellite communication waveforms. Combining the linear canonical transform with the matched filter (MF) to estimate the target parameter. Simulation results show that the proposed method can effectively perform the aerial target sensing by using satellite communication waveforms in the forward scatter scenario.
Highlights
Academic Editors: DmitriyPassive sensing systems generally use the electromagnetic waves of external radiation source, such as FM broadcast, satellite, digital TV broadcast, etc
This work provided a simplified model of the received signal and analyzed its Doppler characteristics in [22]; none of these works has focused on extracting the characteristics from satellite communication waveforms for target sensing; it is of great significance to study the problem of aerial target sensing in the case of forward scatter
This paper has proposed a novel aerial target passive sensing method based on linear canonical transformation, in which the proposed method adopts the forward scatter radar model and satellite communication waveforms characteristics
Summary
Passive sensing systems generally use the electromagnetic waves of external radiation source, such as FM broadcast, satellite, digital TV broadcast, etc. Since the satellite has a low receiving power, and the FSR system has a large radar cross-sectional area, the use of satellites as external radiation sources to construct FSR systems for the aerial target sensing is one of the important areas of FSR systems. This work provided a simplified model of the received signal and analyzed its Doppler characteristics in [22]; none of these works has focused on extracting the characteristics from satellite communication waveforms for target sensing; it is of great significance to study the problem of aerial target sensing in the case of forward scatter.
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