A spread spectrum receiver uses a comparison of the magnitude of the code correlation amplitudes at equal power at a one chip spacing to the magnitude at a central position there between to determine if multipath interference is present. In particular, the present invention is an image processing system that uses an image and signal process that utilizes real-time streaming video-images from a video camera to determine if the occupant is too close to the air bag, or will be to close the air bag by the time that the airbag deploys. A target volume is illuminated from just above its top surface and return signals processed using the PC as programmed with a purpose-built algorithm. The size of the loop is adjustable by pivoting the positioning arms either toward or away from each other. The passage duct straight section is essentially horizontal and receives the web of material delivered to it by the printing group. According to this structure, it is possible to realize a compact and lightweight slot antenna having higher gain and radiation efficiency characteristics in comparison with the conventional meandered slot antenna.