研究目的
To develop and validate a dual-band radar system composed of a photonics-based transceiver and a dual-band antenna for simultaneous operation in S- and X-bands, enhancing detection capabilities in adverse conditions.
研究成果
The dual-band radar system successfully integrates a photonics-based transceiver with a FSS-based antenna, enabling simultaneous operation in S- and X-bands. Experimental validations confirmed detections of aerial targets up to 2.9 km with velocities up to 40 m/s, demonstrating robustness and potential for cost and size reduction in radar applications. Future work includes using the antenna for dual-use radar and communication systems.
研究不足
The FSS-based subreflector introduces lower efficiency in the X-band due to dielectric losses and fabrication imprecisions, such as air gaps. The antenna gain at higher frequencies did not meet theoretical expectations, and the system's performance may be affected by environmental factors.
1：Experimental Design and Method Selection:
The design integrates a photonics-based radar transceiver with a dual-band antenna using a frequency selective surface (FSS) subreflector. Numerical simulations were conducted using ANSYS HFSS for antenna optimization.
2：Sample Selection and Data Sources:
The antenna prototype was built with a main reflector, horn antennas, and FSS subreflector. Radar experiments involved detecting non-cooperative aerial targets (helicopters and airplanes) near Pisa International Airport.
3：List of Experimental Equipment and Materials:
Vectorial network analyzer for S-parameter measurements, horn antennas (WR-340 for S-band, WR-90 for X-band), dielectric substrate (Arlon Diclad 880), and photonics-based radar components.
4：Experimental Procedures and Operational Workflow:
Antenna characterization included reflection coefficient, radiation pattern, and gain measurements. Radar detections were performed with configured parameters (e.g., Doppler frequency, bandwidth) and analyzed using digital signal processing.
5：Data Analysis Methods:
Numerical sweeps in HFSS for antenna dimensions, far-field measurements for radiation patterns, and Doppler map analysis for target detection.
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