Analog Versus Digital Antijam Video Transmission

This paper presents an evaluation of the relative performance provided by analog and digital video modulation approaches. Antijam (AJ) performance of these modulations is considered when used in concert with spread-spectrum techniques such as frequency hopping, and direct sequence pseudorandom modulation. These modulation approaches are compared on the basis of power efficiency, required channel bandwidth, and degree of AJ protection for the same output video quality. The effect of video bandwidth compression and reduction techniques on the relative modulation performance is also presented. A description of an RCA-developed wide-band video AJ system, based on the results of this study, is also included.