NASA NTRS · 19770000162
Secure communications system
Abstract
System employs electronically randomized variant of quadraphase modulation and demodulation between two synchronized transceivers. System uses off-the-shelf components. It may be used with digital data, command signals, delta-modulated voice signals, digital television signals, or other data converted to digital form.
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Doland, G. D.. 1977-09-01. Secure communications system. https://ntrs.nasa.gov/citations/19770000162
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