Authors V.T. Lobach, A.O. Kasyanov, M.V. Potipak, V.A. Alokhin, C.V. Sumatokhin
Month, Year 11, 2015 @en
Index UDC 621.396.969.1
Abstract Recently, there has been increased interest in the use of Multiple Input Multiple Output (MIMO) technology in developing radars for various applications. Radars using traditional MIMO technology have multiple transmit antennas simultaneously transmit probing signals with orthogonal waveform. Reflected from elements of radar scene signals received in parallel with receive antennas and form a set of propagation paths impulse responses, so called MIMO channel matrix. The main advantages of MIMO radars are improved detection performance, better spatial resolution, wide view angle. The paper considers the methodology coherent MIMO radar with frequency division. The main difference between proposed solutions from existing analogues is a sequential formation of MIMO channel matrix. It is shown, that to build a matrix of MIMO channels in a consistent manner requires a larger number of orthogonal probing waveforms and twice longer time, relative to the traditional parallel method. Under certain conditions, it can lead to a loss in signal/noise ratio to not more than 3 dB. To assess resolution in range, speed and bearing, the analysis "range-speed, range-bearing" and "speed-bearing" ambiguity functions are analyzed. It is shown, that usage of multifrequency probing signals, together with reflected signals spatial selection, allows to measure the range, bearing and speed based on single processing of one pulse train. The proposed method of MIMO channel matrix sequential formation leads to simplify hardware implementation of radar, due to use one transmit and one receive channels. From the view-point of proposed method hardware implementation the sequential switching of receiving and transmitting channels can reduce the radar complexity, as a result, its cost.

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Keywords MIMO radar; channel matrix; ambiguity function; multifrequency signal.
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