Laser Radar Receiver Performance Improvement by Inter Symbol Interference

Xuesong MAO  Daisuke INOUE  Hiroyuki MATSUBARA  Manabu KAGAMI  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.8   pp.2631-2637
Publication Date: 2012/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.2631
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Sensing
spread spectrum laser radar,  ISI,  threshold decoding,  high pass filters,  

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The power of laser radar received echoes varies over a large range due to many factors such as target distance, size, reflection ratio, etc, which leads to the difficulty of decoding codes from the received noise buried signals for spectrum code modulated laser radar. Firstly, a pseudo-random noise (PN) code modulated laser radar model is given, and the problem to be addressed is discussed. Then, a novel method based on Inter Symbol Interference (ISI) is proposed for resolving the problem, providing that only Additive White Gaussian Noise (AWGN) exists. The ISI effect is introduced by using a high pass filter (HPF). The results show that ISI improves laser radar receiver decoding ratio, thus the peak of the correlation function of decoded codes and modulation codes. Finally, the effect of proposed method is verified by a simple experiment.