Moving Information Determination Apparatus, a Receiver, and a Method Thereby

• US 20130082873A1
• Filed: 09/10/2012
• Published: 04/04/2013
• Est. Priority Date: 09/30/2011
• Status: Abandoned Application

• Current Assignee: Maishi Electronic (Shanghai) Limited
• Original Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Inventors: He, Xiaoyong, Zou, Jinghua, Tang, Deyu, Gou, Juan
• Application Number:
  US13/609,130
• Publication Number:
  US 20130082873A1
• Time in Patent Office: Days
• US Class Current: 342/357.28
• CPC Class Codes: G01S 19/45 by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement

Abstract

A moving information determination apparatus includes an ECA (Earth Center Assistant) information acquisition module, an altitude information and position information storage module and a moving information calculation module. The altitude information and position information storage module provides initial position information of the moving information determination apparatus and altitude information of the moving information determination apparatus. The ECA acquisition module obtains a radius of the Earth at the current position of the moving information determination apparatus. The moving information calculation module calculates the current position and/or velocity of the moving information determination apparatus based on the radius of the Earth and a plurality of signals from a plurality of satellites.

Claims

1. A moving information determination apparatus for determining moving information comprising:

an altitude information and position information storage module for providing initial position information of the moving information determination apparatus and altitude information of the moving information determination apparatus;

an Earth Center Assistant (ECA) acquisition module for obtaining a radius of Earth at a current position of the moving information determination apparatus based on the initial position information and the altitude information from the altitude information and position information storage module; and

a moving information calculation module for calculating at least one of the current position and velocity of the moving information determination apparatus based on the radius of Earth and a plurality of signals from a plurality of satellites.

2. The moving information determination apparatus of claim 1, wherein the altitude information, and position information storage module further comprising:

an initial position establishment and management module, that obtains the initial position,

wherein the initial position establishment and management module obtains a first position based on an average radius of the Earth and the signals from the satellite, obtains an Nth radius of the Earth that is more accurate than the average radius of the Earth based on an Nth position and a corresponding certain altitude value, obtains an (N+1)th position that is more accurate than the Nth position based on the Nth radius of the Earth and the signals from the satellites, and determines the initial position from the (N+1) positions based on predetermined rule, and wherein N is an integer that is greater than or equal to 1.

3. The moving information determination apparatus of claim 2, wherein the certain altitude value is obtained from an altitude information source or is set as any value according to the actual landscape.

4. The moving information determination apparatus of claim 2, wherein the altitude information and position information torage module further comprising:

a position information database, that stores at least one of positions from the first position to the (N+1)th position and the current position of the moving information determination apparatus.

5. The moving information determination apparatus of claim 4, wherein the moving information determination apparatus further comprising:

a position information updating module, that to updates the Nth position by the (N+1)th position, and updates the (N+1)th position by the current position of the moving information determination apparatus.

6. The moving information determination apparatus of claim 2, wherein the altitude information and position information storage module further comprises an altitude information source for storing altitude information, said altitude information source comprises:

a first altitude information source operable for storing altitude information which is calculated by a GPS receiver;

a second altitude information source operable for storing previous altitude information recorded on the GPS receiver;

a third altitude information source operable for storing altitude information obtained from an external altitude measurement source; and

a fourth altitude information source operable for storing global altitude information.

7. The moving information determination apparatus of claim 6, further comprises an altitude information source selection module operable for selecting an altitude value as a basis to calculate the radius of the Earth from the first, the second, the third and the fourth altitude information sources,

wherein the altitude information source selection module selects the altitude information according to at least one of the methods:

(a) comparing an altitude value stored in the corresponding altitude information source with an altitude datum, and abandoning the altitude value stored in the corresponding altitude information source if a difference between the altitude value and the altitude datum is greater than a first threshold;

(b) comparing an altitude value stored in the corresponding altitude information source with a first altitude value calculated by the moving information determination apparatus based on the altitude value stored in the corresponding altitude information source, and abandoning the altitude value stored in the corresponding altitude information source if a difference between the altitude value and the first altitude value is greater than a second threshold;

(c) comparing the current position calculated by the moving information determination apparatus with a backup previous position stored in the position information database, and abandoning the altitude value stored in the corresponding altitude information source if a difference between the current position and the backup previous position is greater than a third threshold;

(d) comparing the initial position with a backup previous position in the position information database, and abandoning the altitude value stored in the corresponding altitude information source if a difference between the initial position and the backup previous position is greater than a fourth threshold;

wherein the altitude information source selection module selects one of the first, the second, the third and the fourth altitude information sources by the order of selecting the altitude information calculated by the GPS receiver and stored in the first altitude information source, the previous altitude information recorded on the GPS receiver and stored in the second altitude information source, the altitude information obtained from an external altitude measurement source and stored in the third altitude information source, and the altitude information stored in the fourth altitude information source.

8. The moving information determination apparatus of claim 1 wherein the moving information determination apparatus is integrated into a Global Navigation Positioning System,

wherein the moving information determination apparatus further comprises a checking module that determines the validation of the finally calculated position based on the at least one of the parameters of dilution of precision (DOP) value, the intensity of the signals from satellites and if the velocity of the GPS receiver conforms to the motion module.

9. The moving information determination apparatus of claim 1, wherein the moving information determination apparatus is integrated into a Global Positioning Navigation System, wherein the moving information determination apparatus further comprises a selection module that determines to select the moving information determination apparatus, based an at least one of the parameters of the DOP value, the intensity of signals from the satellites, the availability of the radius of the Earth and the number of the satellites.

10. A OPS receiver in a Global Navigation Positioning System, comprising:

a moving information determination apparatus, that comprises;

an altitude information and position information storage module for providing initial position information of the moving information determination apparatus and altitude information of the moving information determination apparatus;

an Earth Center Assistant (ECA) acquisition module for obtaining a radius of the Earth at the current position of the moving information determination apparatus based on the initial position information and the altitude information from the altitude information and position information storage module; and

a moving information calculation module for calculating the current position and velocity of the moving information determination apparatus based on the radius of the Earth and a plurality of signals from a plurality of satellite; and

a baseband signal processing unit for providing the signals from the satellites to the moving information determination apparatus.

11. A method, for determining moving information of an object equipped with a GPS receiver, comprising:

obtaining at an altitude information and position information storage module, initial position information and altitude information of the GPS receiver;

obtaining, at an Earth center assistant information acquisition module, a radius of the Earth at a current position of the GPS receiver based on the initial position information and altitude information of the GPS receiver; and

calculating, at a moving information calculation module, the moving information based on the radius of the Earth and a plurality of signals from a plurality of satellites,

wherein the moving information comprises at least one of the current position and velocity of the receiver.

12. The method of claim 11, wherein the step of obtaining the initial position comprising:

calculating a first position of he GPS receiver based on an average radius of the Earth and the signals from the satellites;

obtaining an Nth radius of the Earth that is more accurate than the average radius of the Earth based on an Nth position and a corresponding certain altitude value;

obtaining an (N+1)th position that is more accurate than the Nth position based on the Nth radius of the Earth and the signals from the satellites; and

determining the initial position from the first position to the (N+1)th position based on a predetermined rule, wherein N is an integer that is greater than or equal to 1.

13. The method of claim 12, wherein the certain altitude value is obtained from an altitude information source or is set as any value according to the actual landscape.

14. The method of claim 12, further comprising:

updating the Nth position by the (N+1)th position; and

updating the (N+1)th position by the current position of the receiver.

15. The method of claim 11, further comprising:

selecting an altitude value as a basis to calculate the radius of the Earth before obtaining the radius of the Earth from an altitude information source, wherein said altitude information source comprises four kinds of altitude information sources,

wherein the four kinds of altitude information source comprises;

a first altitude information source operable for storing altitude information which is calculated by a GPS receiver;

a second altitude information source operable for storing previous altitude information recorded on the GPS receiver;

a third altitude information source operable for storing altitude information obtained from an external altitude measurement source; and

a fourth altitude information source operable for storing global altitude information

16. The method of claim 15, wherein the step of selecting the altitude value is performed according to at least one of the methods:

(a) comparing an altitude value stored in the corresponding altitude information source with an altitude datum, and abandoning the altitude value in the corresponding altitude information source if a difference between the altitude value and the altitude datum is greater than a first threshold;

(b) comparing an altitude value stored in the corresponding altitude information source with a first altitude value calculated by the moving information determination apparatus based on the altitude value stored in the corresponding altitude information source, and abandoning the altitude value stored in the corresponding altitude information source if a difference between the altitude value and the first altitude value is greater than a second threshold;

(c) comparing the current position of the ORS receiver calculated by the moving information determination apparatus with a backup previous position stored in a position information database, and abandoning the altitude value in the corresponding altitude information source if a difference between the current position and the backup previous position is greater than a third threshold;

(d) comparing the initial position with a backup previous position in the position information database, and abandoning the altitude value in the corresponding altitude information source if a difference between the initial position and the backup previous position is greater than a fourth threshold;

wherein the altitude value is selected by the order of selecting the altitude information calculated by the GPS receiver and stored in the first altitude information source, the previous altitude information recorded on the GPS receiver and stored in the second altitude information source, the altitude information obtained from an external altitude measurement source and stored in the third altitude information source, and the altitude information stored in the first altitude information source.

17. The method of claim 11, wherein the method is used in a Global Positioning Navigation System, and wherein the method further comprising:

determining the validation of a finally calculated position based on the at least one of the parameters of the DOP value, the intensity of the signals from satellites and if the velocity of the GPS receiver conforms to the motion module.

18. The method of claim 11, wherein the method is used in a Global Positioning Navigation System, and wherein the method further comprising:

determining to select the method for determining moving information based on at least one of the parameters of the DOP value, the intensity of signals from the satellites, the availability of the radius of the Earth, and the number of the satellites.