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- Q7447754 subject Q7029002.
- Q7447754 abstract "A Selective Availability Anti-spoofing Module (SAASM) is used by military Global Positioning System receivers to allow decryption of precision GPS observations, while the accuracy of civilian GPS receivers may be reduced by the United States military through Selective Availability (SA) and anti-spoofing (AS). However, on May 1, 2000 it was announced that SA was being discontinued, along with a United States Presidential Directive that no future GPS programs will include it. Before the advent of L2C, AS was meant to prevent access to dual-frequency observations to civilian users.SAASM allows satellite authentication, over-the-air rekeying, and contingency recovery. Those features are not available with the similar, but older, PPS-SM system. PPS-SM systems require periodic updates with a classified "Red Key" that may only be transmitted by secure means (such as physically taking the receiver to a secure facility for rekeying or having a trusted courier deliver a paper tape with a new key to the receiver, after which that paper tape must be securely destroyed). SAASM systems can be updated with an encrypted "Black Key" that may be transmitted over unclassified channels. All military receivers newly-deployed after the end of September 2006 must use SAASM.SAASM does not provide any additional anti-jam capability, however the higher data (chipping) rate of P(Y) code can provide a higher processing gain which will provide better tracking performance in a jamming environment. Future GPS upgrades, such as M-Code, will provide additional improvements to anti-jam capabilities.SAASM hardware is covered with an anti-tampering coating, to deter analysis of their internal operation.Deployment of the next generation military signal for GPS, called M-code, commenced with the launch of IIR-M and IIF satellites, beginning in 2005. A complete constellation of 18 satellites with M-code capability is planned for 2016.".
- Q7447754 wikiPageExternalLink saving-saasm-1202.
- Q7447754 wikiPageWikiLink Q11211.
- Q7447754 wikiPageWikiLink Q15903792.
- Q7447754 wikiPageWikiLink Q18822.
- Q7447754 wikiPageWikiLink Q5251356.
- Q7447754 wikiPageWikiLink Q5395703.
- Q7447754 wikiPageWikiLink Q5514330.
- Q7447754 wikiPageWikiLink Q7029002.
- Q7447754 wikiPageWikiLink Q7239523.
- Q7447754 wikiPageWikiLink Q7303534.
- Q7447754 comment "A Selective Availability Anti-spoofing Module (SAASM) is used by military Global Positioning System receivers to allow decryption of precision GPS observations, while the accuracy of civilian GPS receivers may be reduced by the United States military through Selective Availability (SA) and anti-spoofing (AS). However, on May 1, 2000 it was announced that SA was being discontinued, along with a United States Presidential Directive that no future GPS programs will include it.".
- Q7447754 label "Selective availability anti-spoofing module".