Abstract
In this paper, an optical inter-vehicle ranging system is proposed which adopts direct sequence spread spectrum (DS-SS) technology with various optical spreading codes for laser transmission. On-off keying (OOK) is used as a modulation scheme for laser transmission. A background light noise is modeled as an additive white Gaussian noise and lightwave dispersion is considered. A ranging error rate (RER) of the optical inter-vehicle ranging system is evaluated by computer simulation. It is shown that the ranging system using an optical orthogonal code has lower RER than ranging systems using a prime code, an extended prime code, and modified m-sequences even if there are the interference from other users and lightwave dispersion.