: The U.S. Naval Observatory (USNO) is tasked to provide the Global Positioning System (GPS) with a reliable and stable reference to UTC(USN0). This is accomplished using GPS Precise Positioning Service (PPS) timing receivers with a UTC(USN0) reference input. The USNO monitors GPS Time from all available healthy satellites. On a daily basis, the GPS Time correction, based on the entire constellation with respect to UTC(USNO), is determined and provided to the GPS Master Control Station (MCS) 2nd Satellite Operations Squadron (2 SOPS) at Schriever AFB in Colorado. The USNO s GPS PPS operations have been limited to a single-channel receivel; which only allows tracking of one satellite at a time. Since February 2000, the USNO has been evaluating a 12-channel GPS PPS timing receiver, based on the GPS Monitor Station receiver. The unit is capable of tracking P(Y)-code and removes the effects of Selective Availability (SA). This paper describes the various tests conducted, the receiver s performance, and expected improvements to the USNO GPS PPS operations.

Evaluation and Preliminary Results of the New USNO PPS Timing Receiver

The present invention discloses a GNSS receiver-based time service method and a GNSS receiver. The time service method includes the following steps that: the PVT (Position Velocity and Time) local time of one or more navigation systems is acquired through PVT operation; first temperature data inside the GNSS receiver are obtained, first delay data corresponding to the first temperature data are determined, and the PVT local time of any navigation system is compensated with the first delay data; the PPS of whole-second time corresponding to the PVT operation completion time of the current PVT operation is obtained; and the difference value of the compensated PVT local time and the PPS of the whole-second time is calculated, and the PPS of the next second is outputted according to the difference value.

GNSS receiver-based time service method and GNSS receiver

: A new Global Positioning System (GPS) timing receiver has been built for the U.S. Naval Observatory (USNO). The new receiver is a 12-channel Precise Positioning Service (PPS) unit capable of tracking GPS Y-Code signals and internally removing the effects of Selective Availability. It is based on the receiver being used in the GPS Monitor Stations by the GPS Control Segment. Testing is being done at the Naval Research Laboratory (NRL) using the GPS signal simulator. The NRL simulator is capable of producing 10 simultaneous signals with Selective Availability and Y-Code. Initial test results show that prior problems with timing calibration due to uncertainties in the initial conditions in the receiver have been shown to be stable to less than one nanosecond with small bias. Additional data will be presented showing the measured effects of temperature on the receiver.

Initial Test Results for a New PPS GPS Timing Receiver

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Initial Test Results for a New PPS GPS Timing Receiver