Bi-carrier Golay code based ranging with improved range resolution

In this paper, we present Golay code based bi-carrier detection and ranging algorithm that offers improved range resolution. We exploit the zero side lobe property of complementary Golay Code pair for detection and side lobe free ranging of targets. The complementary Golay code pair is transmitted on two orthogonal carriers of a bi-carrier signal We propose base band filtering of the complementary code pair for bandwidth reduction of the bi-carrier signal and to keep the two codes non-interacting. The detection and ranging algorithm for the Golay code based bi-carrier signal is based on a double quadrature demodulator and matched filtering. The performance of the filtered complementary code pair degrades in the presence of noise. Monte-carlo simulations were carried out to investigate the effect of noise on the correlation of filtered Golay code and some of conventional coding signals (PN and Gold sequence) in ranging applications. A comparison of the performance of these codes shows that Golay code is robust to noise among these codes. Improved range resolution and better noise rejection capability supports the unconventional use of Golay code in ranging applications.