Abstract
In this paper, a multiple-input multiple-output (MIMO) radar system was developed using a Keysight’s N5244A 4-port PNA-X network analyzer and Simulink. The system can transmit and receive TDM stepped-frequency continuous wave signals with a total sweep bandwidth of 450 MHz. The system also provides a reliable, self-contained phase-coherent RF front-end across four RF channels, which is a critical requirement for MIMO Radar signal processing algorithms. A Simulink model was built to organize the collected S-parameters into a virtual array and to perform IFFT processing so that range and angle information from targets could be extracted. The experimental results show the ability of the MIMO radar to distinguish between multiple closely spaced targets with a 33 cm range resolution and a 19o angle resolution.
Highlights
The application of multiple-input multiple-output (MIMO) techniques to radar systems has received considerable attention recently [1,2,3,4,5,6,7,8,9,10,11]
Since four elements are being used in the MIMO radar system, the minimum coherent processing interval (CPI) to create a virtual array when using Time-division multiplexing (TDM) is four times the sweep time
Whereas the range resolution of the radar is defined by the bandwidth of the waveform used on transmission, angular resolution is defined by the beamwidth of the virtual array of the MIMO radar
Summary
The application of multiple-input multiple-output (MIMO) techniques to radar systems has received considerable attention recently [1,2,3,4,5,6,7,8,9,10,11]. MIMO radar is implemented through either spatial diversity in antennas or through colocated antennas using orthogonal independently transmitted waveforms [2]. A generic MIMO radar design is illustrated, where there are M independent orthogonal transmitters and N receivers. It is important to note in (1) that the MIMO radar takes the sum of returns from all targets, whereas phased array radar will only have a return from its directed beam. MIMO radar because these signals form the virtual array, which defines the two-way antenna these signals form the virtual array, which defines the two-way antenna pattern, and which contains and which contains the information necessary to conduct beamforming on reception. Theoretical analysis has shown the benefits of the MIMO radar concept, experimental measurements to demonstrate the feasibility and performance of such systems are of great interest.
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