While GPS is an indispensable tool for synchronizing military actions due to extremely accurate and well-synchronized atomic clocks, it is vulnerable to jamming and spoofing.

Mission critical applications require protection from jamming or spoofing (transmission of fake data that looks legitimate). In 1998 the United States Joint Chiefs of Staff selected SAASM (Selective Availability Anti- Spoofing Module) as the security architecture to eliminate the risks of jamming and spoofing. As required under the 2003 Joint Chiefs of Staff Instruction: Master Positioning, Navigation, and Timing Plan (CJCSI 6130.01C), all newly fielded US Department of Defense GPS systems will need to use SAASM-compliant Precise Positioning System (PPS) devices as of October 2006. Enclosure E specifies SAASM for all new GPS deployments. Procurement of non-SAASM GPS user equipment is disallowed unless wavered.

Spectracom offers synchronization to secure SAASM GPS in its SecureSync modular time and frequency reference system and its 9400 Series NetClock network time server. Use of the SAASM versions of these products is restricted to authorized users and is available through Foreign Military Sales (FMS). Contact us for more information.

Choice of MRU or GB-GRAM Receiver

Spectracom’s SecureSync offers a choice of 2 SAASM receivers; a 24-channel Miniature Ruggedized Unit (MRU) and a 12-channel Ground-Based GPS Receiver Application Module (GB-GRAM). When loaded with the crypto-keys, they receive the L1 and L2 GPS frequencies, decrypt the P(Y) code, and precisely synchronize time for the most mission-critical applications. If the keys are not present, are deleted, or have expired, these units operate the same as commercial GPS receivers by receiving and synchronizing to the C/A L1 signal (also known as standard positioning service [SPS] instead of PPS).

Products for SAASM GPS Clock Synchronization