GPS receiver utilizing a communication link
First Claim
1. In a method for determining the position of a remote unit, a process comprising:
- receiving, at said remote unit, a satellite almanac information for a plurality of satellites in view of said remote unit from a source other than a Satellite Positioning System satellite; and
computing, in said remote unit, a position information for said remote unit by using a Doppler information derived from said satellite almanac information.
0 Assignments
0 Petitions
Accused Products
Abstract
A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellites in view of the remote GPS receiver unit.
583 Citations
35 Claims
-
1. In a method for determining the position of a remote unit, a process comprising:
-
receiving, at said remote unit, a satellite almanac information for a plurality of satellites in view of said remote unit from a source other than a Satellite Positioning System satellite; and computing, in said remote unit, a position information for said remote unit by using a Doppler information derived from said satellite almanac information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A mobile unit which uses data representative of Satellite Positioning System (SPS) signals to provide the position of said mobile unit, said mobile unit comprising:
-
a receiver in said mobile unit, said receiver operable for coupling through a communications link to receive a satellite almanac information for a plurality of satellites in view of said mobile unit wherein said satellite almanac is received from a source other than a satellite positioning system satellite; a processing unit in said mobile unit, said processing unit coupled to said receiver to receive said satellite almanac information and compute a position information for said mobile unit by using a Doppler information derived from said satellite almanac information. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method of using a basestation for providing a communications link to a mobile GPS unit, said method comprising:
-
determining a satellite almanac information for a plurality of satellites in view of said mobile GPS unit; transmitting said satellite almanac information to said mobile GPS unit for determination of a Doppler information. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A basestation for providing a communication link to a mobile GPS unit, said basestation comprising:
-
a source of a satellite almanac information for a plurality of satellites in view of said mobile GPS unit; a transmitter coupled to said source of said satellite almanac information, said transmitter for transmitting through said communication link said satellite almanac information to said mobile GPS unit for determination of a Doppler information. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
-
Specification