In multiple input multiple output (MIMO) radar systems, choosing a proper orthogonal waveform is a critical task. A new hybrid spread spectrum (HSS) technique is proposed to maintain orthogonality at the transmit and receive ends. The HSS technique is a combination of direct-sequence spreading and frequency hopping schemes. In the context of MIMO radar, the transmitted signals are first spread using Hadamard-Walsh orthogonal codes and in every pulse repetition period, each signal hops to a different center frequency. The transmitted HSS signals are orthogonal in frequency and code domains. Simulation results show that the proposed HSS technique can achieve sharper auto ambiguity response and lower sidelobe cross ambiguity response with a gain of over 10 dB and better probability of detection in comparison with frequency orthogonality technique. The proposed HSS technique has the potential to resolve closely spaced targets and provide better immunity against narrowband interferences.

auto ambiguity function and cross ambiguity function, CDMA, hybrid spread spectrum, MIMO radar, orthogonal codes
2018 IEEE Radar Conference, RadarConf 2018
Department of Systems and Computer Engineering

Chahrour, H. (Hossein), Rajan, S, Dansereau, R, & Balaji, B. (Bhashyam). (2018). Hybrid spread spectrum orthogonal waveforms for MIMO radar. In 2018 IEEE Radar Conference, RadarConf 2018 (pp. 1010–1014). doi:10.1109/RADAR.2018.8378699