Global positioning system device and ionosphere error estimation method thereof
AssigneeInstitute for Information Industry
InventorsMing Yang, Shau-Shiun Jan, An-Lin Tao, Chih-Hung Li, Shan-Yuan Yang
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Abstract
A global positioning system device and an ionosphere error estimation method thereof are provided. The global positioning system device is connected to a plurality of dual-band base stations, and receives a plurality of ionosphere pierce point coordinates and a plurality of ionosphere errors from the dual-band base stations. The global positioning system device calculates a user ionosphere error by an interpolation method based on the ionosphere pierce point coordinates and the ionosphere errors of the dual-band base stations and a user ionosphere pierce point coordinate of the global positioning system device.
Claims6
An ionosphere error estimation method for use in a global positioning system (GPS) device, the GPS device connecting with a first dual-band base station and a second dual-band base station, the ionosphere error estimation method comprising the following steps of:
- (a) enabling the GPS device to receive a first ionosphere pierce point (IPP) coordinate and a first ionosphere error from the first dual-band base station, wherein the first dual-band base station receives a first positioning signal from a GPS satellite via a first IPP, calculates the first IPP coordinate according to the first IPP and calculates the first ionosphere error according to the first positioning signal;
- (b) enabling the GPS device to receive a second IPP coordinate and a second ionosphere error from the second dual-band base station, wherein the second dual-band base station receives a second positioning signal from the GPS satellite via a second IPP, calculates the second IPP coordinate according to the second IPP, and calculates the second ionosphere error according to the second positioning signal;
- (c) enabling the GPS device to receive a user positioning signal from the GPS satellite via a user IPP;
- (d) enabling the GPS device to calculate a user IPP coordinate according to the user IPP;
- and
- (e) enabling the GPS device to calculate a user ionosphere error through interpolation method according to the first IPP coordinate and the first ionosphere error of the first dual-band base station, the second IPP coordinate and the second ionosphere error of the second dual-band base station and the user IPP coordinate directly.
A global positioning system (GPS) device, which connects with a first dual-band base station and a second dual-band base station, the GPS device comprising:
- a network signal receiver, being configured to receive a first ionosphere pierce point (IPP) coordinate and a first ionosphere error from the first dual-band base station, and receive a second IPP coordinate and a second ionosphere error from the second dual-band base station, wherein the first dual-band base station receives a first positioning signal from a GPS satellite via a first IPP, calculates the first IPP coordinate according to the first IPP and calculates the first ionosphere error according to the first positioning signal, and the second dual-band base station receives a second positioning signal from the GPS satellite via a second IPP, calculates the second IPP coordinate according to the second IPP, and calculates the second ionosphere error according to the second positioning signal;
- a GPS signal receiver, being configured to receive a user positioning signal from the GPS satellite via a user IPP;
- and
- a processor, being configured to calculate a user IPP coordinate according to the user IPP, and calculate a user ionosphere error through interpolation method according to the first IPP coordinate and the first ionosphere error of the first dual-band base station, the second IPP coordinate and the second ionosphere error of the second dual-band base station and the user IPP coordinate directly.
Dependencies are inferred from the claim text.