Zero Crossing Counter for Accuracy Improvement of FMCW Range Detection

For civil and military purposes FMCW radars are widely used. The theoretical background is well-established. Nevertheless, improvement of various aspects of these radars is still required. Signal processing is one of the crucial points of the system which determines the capabilities of the radar. In this study a zero crossing detector implementation, which can be efficiently used for target detection and range calculation in short range FMCW range detector is proposed. The duration between consecutive zero-crossings are used as the data instead of the number of cycles per unit time. Experimental evaluation of its performance is also given.

Zero Crossing Counter for Accuracy Improvement of FMCW Range Detection

For civil and military purposes FMCW radars are widely used. The theoretical background is well-established. Nevertheless, improvement of various aspects of these radars is still required. Signal processing is one of the crucial points of the system which determines the capabilities of the radar. In this study a zero crossing detector implementation, which can be efficiently used for target detection and range calculation in short range FMCW range detector is proposed. The duration between consecutive zero-crossings are used as the data instead of the number of cycles per unit time. Experimental evaluation of its performance is also given.

___

  • A.G. Stove, “Linear FMCW Radar Techniques”, IEE Proceedings-F, vol. 139, 1992.
  • I.V. Komarov, S.M. Smolskiy, Fundamentals of Short Range FM Radar, Boston, Artech House, 2003.
  • J. Liu, X. Chen, Z. Zhang, “A Novel Algorithm in the FMCW Microwave Liquid Level Measuring System”, Measurement Science and Technology vol.17, pp. 135-138, 2006.
  • D. L Maskell, G.S. Woods, J.M. Murray, “A Microprocessor Controlled Microwave Ranging System for High Accuracy Industrial Applications”, IEEE Instrumentation and Measurement Technology Conference, IMTC G.S. Woods, D.L. Maskell, M.V. Mohaney, “A High Accuracy Microwave Ranging System for Industrial Appli- cation”, IEEE Transactions on Instrumentation and Measurement, vol. 42, pp. 812-816, 1993.
  • R. Zhang, J. Yang, J. Xiong, “Novel Method of Parameter Estimation for Moving Target in Millimeter-wave Short-range Linear FMCW Radar”, 7th International Conference on Signal Processing Proceedings, ICSP 2004.
  • M. Bouchard, D. Gingras, Y. De Villers, D. Potvin, “High Resolution Spectrum Estimation of FMCW Radar Signals”, IEEE Seventh SP Workshop on Statistical Signal and Array Processing, 1994.
  • L. Yang, L. Liwan, P. Weifeng, C. Yanqin, F. Zhenghe, “Performance Comparison of Super-resolution Estimation Algorithms Used in Real or Complex LFMCW Systems”, International Conference on Microwave and Millimeter Wave Technology Proceedings, 2000.
  • S. De Waele, P.M.T. Broersen, “Modeling Radar Data with Time Series Models”, European Signal Processing Conference X, EUPSICO 2000.
  • H. Wensink, A. Bazen, “On Automatic Clutter IdentiŞcation and Rejection”, IEEE Radar ’99, France1999.
  • B. Kedem, “Spectral Analysis and Discrimination by Zero-Crossings”, Proceedings of IEE, vol. 74, pp 1477-1493,
  • G.L. Cote, M.D. Fox, “Comparison of Zero Crossing Counter to FFT Spectrum of Ultrasound Doppler”, IEEE Transactions on Biomedical Engineering, 1988.
  • M.I. Skolnik, Introduction to Radar Systems, Singapore, McGraw-Hill Book Company, 1980 Second Edition.
  • M. Secmen, S. Demir, A. Hizal, “Dual-polarised T/R Antenna System Suitable for FMCW Altimeter Radar Applications”, IEE Proceedings Microwaves Antennas and Propagation, 2006.