Method and a system for positioning of an electronic device, and an electronic device
First Claim
1. A method for positioning an electronic device in which a code modulated signal transmitted by satellites, Position information of the satellites and time data are received, and local time data is generated, wherein in delta range measurements are taken for at least four different satellite, the satellite velocity is determined in relation to the electronic device for each of said at least four satellites, said delta range measurements and velocities are used for generating reference data to find out the frequency error of the local time data and the position of the electronic device, and the minimum value of said reference data is searched.
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Abstract
The present invention relates to a method for positioning of an electronic device by receiving a code modulated signal transmitted by satellites, position information of the satellites and time data, and by generating local time data. In the method, delta range measurements are taken to at least four different satellites. For each of said at least four satellites, the velocity of the satellite is determined in relation to the positioning receiver. Furthermore, in the method, the delta range measurement results are replaced in an algorithm applying said delta range measurements and velocities to generate reference data for determining the local time data frequency error and the position. The local time data frequency error and the position are determined by searching for the minimum value of said reference data. The invention also relates to a system and an electronic device applying the method.
21 Citations
19 Claims
- 1. A method for positioning an electronic device in which a code modulated signal transmitted by satellites, Position information of the satellites and time data are received, and local time data is generated, wherein in delta range measurements are taken for at least four different satellite, the satellite velocity is determined in relation to the electronic device for each of said at least four satellites, said delta range measurements and velocities are used for generating reference data to find out the frequency error of the local time data and the position of the electronic device, and the minimum value of said reference data is searched.
- 9. A system comprising receiving means for receiving code modulated signals transmitted by satellites, means for receiving position information of the satellites and time data, and means for generating local time data, wherein it comprises means for taking delta range measurements to at least four different satellites, means for determining the velocity of each of said at least four satellites in relation to the receiving means, means for using said delta range measurements and velocities for generating reference data to determine the frequency error of the local time data and position, and means for searching for the minimum value of said reference data.
- 15. An electronic device comprising means for receiving code modulated signals transmitted by satellites, means for receiving position information of the satellites and time data, and means for generating local time data, wherein the electronic device comprises means for taking delta range measurements to at least four different satellites, means for determining the velocities of each of said at least four satellites in relation to the electronic device, means for using said delta range measurements and velocities to generate reference data for determining the frequency error of the local time data and position, and means for searching for the minimum value of said reference data.
Specification