Over-the-Air Distribution (OTD) Update (Briefing Charts).

摘要

OTAD Overview. OTAD/OTAR are alternative methods of key distribution. OTAD Next black key sent to user via the GPS navigation message. OTAR Superset of OTAD key sent via the navigation message. Receiver must be on and have a good daily key. If receiver is off or out of keys user obtains next key from COMSEC custodian. OTAR/OTAD Background. Many users rely on OTAD for distribution of cryptokeys. DAGR S/W update released to take full advantage of OTAD and mission constellation operations. 4+ years of successful US OTAD broadcasts. Mission constellations allow simultaneous broadcast of multiple OTAD messages. The SAASM Mission Planning System (SMPS) at the JSpOC performs constellation optimization and assigns OTAR/OTAD keys to be broadcast from each SV.