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Performance Analysis of Ground Target Detection Utilizing Beidou Satellite Reflected Signals
Chaoqun Gao1, DongKai Yang2, XueBao Hong3
1School of Electronic and Information Engineering, Beihang University, Beijing 100191, China. 13370149796@163.com.
Sensors (Basel, Switzerland)
|May 12, 2019
Summary
This study demonstrates ground target detection using BeiDou satellite signals. Phase difference analysis of reflected signals reliably detects stationary and moving targets, proving the method
Area of Science:
- Geophysics
- Satellite Remote Sensing
- Signal Processing
Background:
- Traditional ground target detection methods face limitations in certain environments.
- BeiDou Navigation Satellite System (BDS) signals offer a potential alternative for passive sensing.
- Reflected satellite signals contain information about surface characteristics and objects.
Purpose of the Study:
- To develop and validate a novel ground target detection method utilizing reflected BeiDou satellite signals.
- To analyze the effectiveness of phase difference information from phase-lock loops (PLL) for target detection.
- To investigate the influence of satellite geometry and target dynamics on detection performance.
Main Methods:
- Establishing geometric relationships between BeiDou satellites, specular points, and ground targets.
- Analyzing phase difference data derived from PLL tracking of reflected BeiDou signals.
- Conducting field experiments in Beijing with stationary and moving targets.
- Evaluating target detection using in-phase (I) branch data, phase difference, and carrier-to-noise ratio (CNR).
Main Results:
- Observed phase differences in BeiDou signals correlated with target presence during experimental periods.
- Experimental results confirmed the feasibility of detecting both stationary and moving targets.
- Target motion direction was discernible from changes in the satellite's I branch component data.
- Carrier-to-noise ratio (CNR) exhibited significant variations for moving targets compared to stationary ones.
Conclusions:
- Ground target detection using BeiDou reflected signals is feasible and reliable.
- Detection performance is influenced by satellite altitude and azimuth angles.
- Satellite signal components (I branch, phase difference, CNR) provide valuable information for target characterization and motion analysis.
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