A Study of Very Broadband Antijam Modulation/Demodulation Techniques For Passive Satellite Circuits,
Abstract
A combined theoretical and experimental investigation of techniques suitable for incorporation into a braodband (about 100 mc) direct sequence AJ modulator and demodulator has been initiated. Results to date have been concerned with the high-speed keystream generator, with the microwave biphase modulator and correlation mixer and with methods of achieving synchronization. Evaluation of alternative high-speed digital circuitry techniques has led to the selection of hybrid NOR circuits (tunnel diode - charge storage diode) and noninverting delay circuits as the basic components employed in the breadboard binary keystream generator. Analytical studies of the effect of phase and amplitude unbalance on the maximum AJ protection achievable in a biphase direct sequence system in the face of continuous CW jamming at the carrier frequency have provided expressions for the bit error rate (assuming coherent PSK) as functions of phase and amplitude unbalance and jamming-to-signal ratios. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1963
- Accession Number
- AD0346611
Entities
People
- J. Lindholm
- J. Wittman
Organizations
- Sylvania Electric Products