METHOD AND DEVICE FOR STORING ECONOMICALLY AUXILIARY CORRECTION DATA APPLIED IN GLOBAL NAVIGATION SATELLITE SYSTEM

• US 20070216574A1
• Filed: 03/14/2006
• Published: 09/20/2007
• Est. Priority Date: 03/14/2006
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Huang, Kung-Shuan
• Granted Patent: US 7,629,923 B2
• Time in Patent Office: Days
• US Class Current: 342/357.240
• CPC Class Codes: G01S 19/41 Differential correction, e.g. DGPS [differential GPS]

Abstract

A method applied in a Global Navigation Satellite System (GNSS) for minimizing storage of correction data is disclosed. The method comprises: determining the receiver position and satellite positions; determining a intermediate point according to the receiver position and the satellite position; determining a current cell of the intermediate point; and storing the correction data sets related to the current cell.

Claims

1. A method applied in a Global Navigation Satellite System (GNSS) for minimizing storage of correction data, comprising:

determining a receiver position and at least a satellite position;

determining a intermediate point according to the receiver position and the satellite position;

determining a current cell of the intermediate point; and

storing the correction data sets related to the current cell.

2. The method of claim 1, wherein the satellite position is corresponded to a visible satellite.

3. The method of claim 1, wherein the intermediate point is in a predetermined atmospheric layer.

4. The method of claim 3, wherein the intermediate point is in the ionosphere.

5. The method of claim 1, wherein the current cell is consisted of at lest three ionospheric grid points (IGP), and the IGPs surround the intermediate point.

6. The method of claim 1, further comprising the following steps:

determining a future cell; and

storing a plurality of correction data sets related to the future cell.

7. The method of claim 6, wherein the step of determining a future cell further comprises:

determining the future cell according to the intermediate point and a motivation of the intermediate point.

8. The method of claim 6, wherein the current cell is consisted of at lest three ionospheric grid points (IGP) which surround the intermediate point, and the future cell is also consisted of at least three IGPs which overlap at least one IGP with the current cell.

9. The method of claim 8, wherein the GNSS receiver further comprises an IGP pool for recording the IGP information to collect the IGP delay data, the method further comprises:

refreshing the IGP information in the IGP pool according to the IGPs of the current cell and the future cell.

10. The method of claim 9, further comprising the following steps:

For each IGP delay data, check whether the corresponding IGP information exists in the IGP pool;

if yes, store the correction data related to the IGP into the IGP pool; and

if no, check whether the IGP pool is available for storing more IGP information;

if yes, store the correction data related to the IGP; and

if no, discard the data.

11. The method of claim 10, further comprising the following step:

correcting the receiver position according to the correction data in the IGP pool.

12. The method of claim 6, wherein the motivation of the intermediate point is a velocity vector of the intermediate point.

13. The method of claim 6, wherein the motivation of the intermediate point is a locus of the intermediate point.

14. A computer-readable medium comprising computer-executable instructions for implementing the method as claim in claim 1.

15. A portable device, comprising a processor and a memory, adapted to implement the method as claimed in claim 1.