Assessment of Weighting Functions Used in Oppermann Codes in Polyphase Pulse Compression Radars

Document Type : Research Article


1 B. Zakeri is with Babol University of Technology, Babol, Iran, (

2 M. R. Zahabi Babol University of Technology, Babol, Iran, (

3 Corresponding Author, S. Alighale is with Babol University of Technology, Babol, Iran, (


Polyphase is a common class of pulse compression waveforms in the radar systems. Oppermann code is one of the used codes with polyphone pattern. After compression, this code has little tolerant against Doppler shift in addition to its high side lobe level. This indicates that the use of Oppermann code is an unsuitable scheme to radars applications. This paper shows that the use of amplitude weighting functions improves properties of code and makes it an appropriate technique. Noticeable reduction in sidelobe and false alarm as well as the increase of the target detection ability and Doppler tolerant are the signature of amplitude weighting functions investigated and simulated in this study.


[1]     M. Skolnik, Introduction to radar system, 2nd ed., McGraw-Hill, NewYork, 1980.
[2]     P. E. Peace, Low probability of intercept radar, Artech House, Boston, 2004.
[3]     B. L. Lewis and F. F Kretschmer Jr., “A New Class of Polyphase Pulse Compression Codes and Techniques,” IEEE Transactions on Aerospace and Electronic System, Vol.17, No.3, 364-372, May 1981.
[4]     I. Oppermann and B. S. Vucetic, “Complex Spreading Sequences with a Wide Range of Correlation Properties,” IEEE Trans. on Commun., vol. 45, pp. 365–375, Mar. 1997.
[5]     B. L. Lewis, “Range Sidelobe Reduction Technique for FM Derived Polyphase Codes,” IEEE Transactions on Aerospace and Electronic System, vol. 29, no. 3, July 1993.
[6]     F. F. Kretschmer and B. L. Lewis, “Doppler Properties of Polyphase Coded Pulse Compression Waveforms,” IEEE Trans. on Aerospace and Electronic Systems, vol. 19, no. 4, pp. 521-531, July 1983.
[7]     F.F. Kretschmer Jr. and L. R. Welch, “Sidelobe Reduction Techniques for Polyphase Pulse Compression Codes,” IEEE International Radar conference, 2001. p.441-6.
[8]     P. Fan and M. Darnell, “Sequence Design for Communications Applications,” Somerset: Research Studies Press, 1996.
[9]     .-J. Zepernick and A. Finger, “Pseudo Random Signal Processing: Theory and Application,” Chichester: John Wiley & Sons, 2005.
[10]  M.Jamil, H.J. Zepernick and M. I. Pettersson, “Performance Assessment of Polyphase Pulse Compression Codes,” IEEE Int. Symp. On SpreadSpect. Techn. and Appl., Bologna, Italy, pp. 161-165, Aug. 2008.