New GPS civil messages
The US DoT is seeking comments on plans to broadcast pre-operational civil navigation messages from GPS satellites.
The Department of Transportation is seeking comment from the public and industry on USAF plans to broadcast these pre-operational L2C and L5 civil navigation (CNAV) messages from some satellites, beginning in April 2014.
Although the messages will be formatted in accordance with promulgated interface specs, DoT warns that their pre-operational nature means that their availability and other characteristics may not comply with all requirements of the relevant interface specs - and should be employed at the users’ risk.
DoT is seeking comments before 4 April 2014 on:
- (a) Benefits, risks or issues to users from this plan, including comments on the appropriate timeline for broadcasting pre-operational CNAV messages.
- (b) Receiver development benefits and other intended uses of pre-operational signals.
- (c) Benefits and potential impacts to users of continuous pre-operational CNAV messages with L2C and L5 signals set healthy.
The CNAV message broadcasts - planned to begin later in April 2014 - will be implemented on all operational GPS satellites capable of transmitting L2C and L5 signals. Currently, 7 IIR–M satellites broadcast L2C, and 4 IIF satellites broadcast L2C and L5.
On average, users may expect at least one L2C-broadcasting satellite to be in view at all times.
Further information and submission details are at the DoT link below . .
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