研究目的
Investigating the use of VHF Omnidirectional Range (VOR) navigation aid system as a signal donor for passive radar experiments to detect airliners and analyze their radar cross section (RCS).
研究成果
The experiment demonstrated that passive radar using VOR signals can effectively estimate the RCS of airliners. The average RCS values obtained were consistent with measurements from anechoic chamber tests, validating the technique's potential for large-scale angular domain analysis of target signatures.
研究不足
The bistatic configuration introduces complexity in analyzing RCS due to the dependence on four parameters (θTx, ψTx, θRx, ψRx). The technique's accuracy is limited by the signal-to-noise ratio and the quality of trajectory data from ADS-B.
1：Experimental Design and Method Selection:
The experiment was designed as a bistatic passive radar system using a VOR beacon as the signal donor. The signal processing involved Doppler processing and extraction of target echoes.
2：Sample Selection and Data Sources:
Airliners flying in the vicinity of the VOR beacon were selected as targets. Data on their trajectories were obtained using ADS-B receivers.
3：List of Experimental Equipment and Materials:
The receiving system consisted of one horizontal antenna, a tuned receiver, and a data acquisition system. The VOR transmitter operated at 117.3 MHz with a power of 200 Watts.
4：3 MHz with a power of 200 Watts.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The received signal was digitized and processed to detect targets based on Doppler frequency shifts. The RCS of targets was estimated using the radar equation.
5：Data Analysis Methods:
The amplitude of target echoes was extracted and analyzed to estimate RCS. The evolution of RCS was analyzed as a function of the target's attitude in azimuth and elevation.
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