研究目的
To analyze the performance of photonics-based MIMO radars as a function of the spatial geometry of transmitting/receiving elements, the signal parameters and noise characteristics, and to confirm their capability to enable a cross-range super-resolution.
研究成果
The results confirm the huge potential of MIMO detection also in case of multiple targets, and the capability to enable a cross range super-resolution. The correct detection of two targets 3 cm apart in cross-range direction utilizing signals with a BW of 1 GHz (15 cm of resolution) was demonstrated, obtaining a resolution improvement of a factor 5. The importance of the antenna lay-out and number of receivers and transmitters have also been demonstrated. Finally, robustness against additive noise and insensitivity to real phase noise values assured by photonics have been verified.
研究不足
The analysis is based on a simulator and not on real-world experiments. The performance of the system could be affected by real-world conditions not accounted for in the simulator.
1：Experimental Design and Method Selection:
A 2-D simulator was developed to study the performance of photonics-based MIMO radars. The simulator includes modules for scenario simulation, signal simulation, detection, and presentation.
2：Sample Selection and Data Sources:
The scenario used in the model has an antenna configuration of M transmitters and N receivers, with all antennas equidistant to the target and occupying an angular sector of 2θ.
3：2θ. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The reference signal parameters initially used in the model are: 10 GHz carrier frequency, pulsed/chirped signal, signal bandwidth of 1 GHz, sampling frequency of 4 GHz, and signal-to-noise ratio (SNR) of 18 dB.
4：Experimental Procedures and Operational Workflow:
The signal simulator module generates the M transmitted signals and calculates the MxN received signal matrix. The detection module implements a log-likelihood function suitable for a MIMO approach.
5：Data Analysis Methods:
The presentation module takes the statistic output from the detection algorithm and allows the presentation of the desired output (range/cross-range map, extinction ratio [dB], histogram).
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