Apparatus and method for time maintenance in a satellite position system receiver
First Claim
1. An apparatus for time maintenance in a satellite positioning system receiver configured to receive data from a plurality of satellites, the apparatus comprising:
- means for maintaining stored timing data for use by the receiver;
means associated with the receiver for using the stored timing data to acquire communication signals from at least one satellite vehicle;
processing means for deriving a first portion of timing information using the acquired communication signals, the processing means deriving a second portion of timing information using the stored timing; and
means for combining the first and second portions to determine a real time estimate.
0 Assignments
0 Petitions
Accused Products
Abstract
A system for maintaining time in a satellite positioning system (SPS) receiver that relies on almanac data to maintain a reasonably accurate time. The approximate time based on almanac data is sufficiently accurate to bound the unknown parameters when a request for position is received. The receiver may automatically update the internal time and/or position. When a time update is required, the approximate time based on almanac data is sufficiently accurate that the receiver need only acquire the code phase from the satellites and can internally determine the code period into the bit and the bit into the week based on the almanac data.
-
Citations
21 Claims
-
1. An apparatus for time maintenance in a satellite positioning system receiver configured to receive data from a plurality of satellites, the apparatus comprising:
-
means for maintaining stored timing data for use by the receiver;
means associated with the receiver for using the stored timing data to acquire communication signals from at least one satellite vehicle;
processing means for deriving a first portion of timing information using the acquired communication signals, the processing means deriving a second portion of timing information using the stored timing; and
means for combining the first and second portions to determine a real time estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for time maintenance in a satellite positioning system receiver configured to receive data from a plurality of satellites, the method comprising:
-
maintaining stored timing data;
using the stored timing data to acquire communication signals from at least one satellite vehicle;
using the acquired communication signals to derive a first portion of timing information;
using the stored timing data to derive a second portion of timing information; and
combining the first and second portions to determine a real time estimate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification