Almanacs Service |
An Almanac is a data set containing reduced-precision orbital parameters, and other data, for a GPS satellite. Almanac information can be obtained from the NetRS by using the Almanacs Service. This allows the user to obtain GPS almanac data for all satellites without affecting any continuous streams.
The Almanacs Service is triggered whenever an external client program connects to an Almanacs Service TCP port. In response, the NetRS will transmit the Almanac data, for all satellites, to the client, in RT17 format. Once all the Almanac information has been sent, the NetRS will close the connection. The client application should then drop its end of the connection. Note that the Almanac data is provided only once each time the port is opened. It is not a continuous stream.