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| Automotive Radar: From Its Origins to Future Directions |
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| Vehicular mmWave Communication and Joint Communication Radars |
Heinz Haderer, Reinhard Feger, Clemens Pfeffer, and Andreas Stelzer
Institute for Communications Engineering and RF-Systems, Johannes Kepler University Linz
Altenberger Str. 69, 4040 Linz, Austria
Email: h.haderer, r.feger, c.pfeffer, a.stelzerg@nthfs.jku.at
Abstract —We present a phase-coded continuous-wave (CW) multiple-input multiple-output (MIMO) radar approach based on code-division multiplexing. We use zero-correlation-zone (ZCZ) sequence sets to separate at the receivers signals from multiple transmitters. In particular, our approach uses equidistantly shifted almost-perfect autocorrelation sequences for efficient implementation. We carried out measurements using a software-defined radar platform with 16 MIMO channels to demonstrate the capability of the proposed approach.Haderer, H.; Feger, R.; Stelzer, A., "A comparison of phase-coded CW radar modulation schemes for integrated radar sensors," Microwave Conference (EuMC), 2014 44th European , vol., no., pp.1896,1899, 6-9 Oct. 2014
IndexTerms—phase-coded CW radar, zero correlation sequence sets, APAS, MIMO, beamforming
doi: 10.1109/EuMC.2014.6986832
Abstract: For radar sensors, for example, automotive radar sensors based on integrated circuits, taking advantage of the growing capabilities of digital circuits is becoming of increasing interest. Currently used linear frequency-modulated continuous wave (FMCW) signals could be replaced with phase-coded ones. As a consequence, the codes used would become a significant design parameter. In our investigation, we applied three binary codes (binary m-sequence, almost perfect autocorrelation sequence, and Golay-complementary sequence), one two-valued code (Golomb's code), and one ternary sequence (Ipatov's ternary sequence) and used a linear FMCW signal for comparison. The codes were selected with a future realization of the radar system based on integrated circuits in mind. We provide brief instructions for generating each sequence. Finally, we demonstrate the performance of the phase-coded signals by means of measurements carried out with a SiGe-based RF IQ-transceiver.IEEE MTT-S 2015 International Microwave Symposium Technical Program
keywords: {CW radar;Golay codes;sensors;FMCW signals;Golay complementary sequence;Golomb code;Ipatov ternary sequence;autocorrelation sequence;automotive radar sensors;binary m-sequence;digital circuits;integrated circuits;integrated radar sensors;linear FMCW signal;linear frequency modulated continuous wave;phase coded CW radar modulation scheme comparison;radar system;Correlation;Integrated circuits;Phase measurement;Polynomials;Radar cross-sections;Sensors},
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6986832&isnumber=6986339
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| Periodic autocorrelation property of optimized punctured ZCZPS. |
Lei Xu; Qilian Liang, "Zero Correlation Zone Sequence Pair Sets for MIMO Radar," Aerospace and Electronic Systems, IEEE Transactions on , vol.48, no.3, pp.2100,2113, JULY 2012
doi: 10.1109/TAES.2012.6237581
Abstract: Inspired by recent advances in multiple-input multiple-output (MIMO) radar, we apply orthogonal phase coded waveforms to MIMO radar system in order to gain better range resolution and target direction finding performance. We provide and investigate a generalized MIMO radar system model using orthogonal phase coded waveforms. In addition, we slightly modify the system model to improve the system performance. Accordingly, we propose the concept and the design methodology for a set of ternary phase coded waveforms that is the optimized punctured zero correlation zone (ZCZ) sequence-pair set (ZCZPS). We also study the MIMO radar ambiguity function of the system using phase coded waveforms, based on which we analyze the properties of our proposed phase coded waveforms which show that better range resolution could be achieved. In the end, we apply our proposed codes to the two MIMO radar system models and simulate their target direction finding performances. The simulation results show that the first MIMO radar system model could obtain ideal target direction finding performance when the number of transmit antennas is equal to the number of receive antennas. The second MIMO radar system model is more complicated but could improve the direction finding performance of the system.
keywords: {MIMO radar;antenna arrays;orthogonal codes;phase coding;receiving antennas;ZCZ-ZCZPS;direction finding performance;generalized MIMO radar system model;multiple-input multiple-output radar;orthogonal phase coded waveforms;receive antennas;ternary phase coded waveforms;zero correlation zone sequence pair sets;zero correlation zone sequence-pair set;Correlation;MIMO;MIMO radar;Radar antennas;Receiving antennas;Transmitting antennas},
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6237581&isnumber=6237562
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