DUAL-MODE LOCATION POSITION SYSTEM

• US 20070265775A1
• Filed: 05/11/2006
• Published: 11/15/2007
• Est. Priority Date: 05/11/2006
• Status: Active Grant

• Current Assignee: Accton Technology Corporation
• Original Assignee: Accton Technology Corporation
• Inventors: Liu, I-Ru, Tsai, Ting-Yi, Lu, Kuen-Ruey, Liu, Te-Yao
• Granted Patent: US 7,599,796 B2
• Time in Patent Office: Days
• US Class Current: 701/213
• CPC Class Codes: G01C 21/20 Instruments for performing navigational calculations G01C21/24, G01C21/26 take precedence
• CPC Class Codes: G01S 19/32 Multimode operation in a single same satellite system, e.g. GPS L1/L2
• CPC Class Codes: G01S 19/46 the supplementary measurement being of a radio-wave signal type
• CPC Class Codes: G01S 19/48 by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

The dual mode positioning system comprises multiple wireless network devices, one of the multiple wireless network devices including a GPS receiver. DSS is coupled to the multiple wireless network devices and an operation mode switch is also coupled to the multiple wireless network devices including a GPS receiver. A satellite GPS receiver coupled to the operation mode switch. The satellite GPS receiver is operated in an indoor area confined by walls with wide FOV (field of view) glass window, the operation mode switch switching to GPS mode for the satellite GPS receiver receives signals from greater than 3 satellites. Moreover, the satellite GPS receiver is operated in an indoor area confined by concrete walls or walls with narrow FOV glass window, the operation mode switch switching to Joint GPS/WPS mode for the satellite GPS receiver cannot receive signals from greater than 3 satellites.

Claims

1. A dual mode positioning system, comprising:

multiple network communication devices, one of said multiple network communication devices including a GPS receiver;

DSS coupled to said multiple network communication devices;

an operation mode switch coupled to said multiple network communication devices including a GPS receiver; and

a satellite GPS receiver coupled to said switch.

2. The system of claim 1, wherein said satellite GPS receiver is operated in an indoor area confined by walls with wide FOV (field of view) glass window, said operation mode switch switching to GPS mode for said satellite GPS receiver receives signals from greater than 3 satellites.

3. The system of claim 1, wherein said satellite GPS receiver is operated in an indoor area confined by concrete walls or walls with narrow FOV glass window, said operation mode switch switching to Joint GPS/WPS mode for said satellite GPS receiver cannot receive signals from greater than 3 satellites.

4. The system of claim 3, wherein said Joint GPS/WPS mode, said satellite GPS receiver may discard null or degraded GPS position data and replace it by Joint GPS/WPS position data or coordinate degraded GPS position data with Joint GPS/WPS position data in order to improve the accuracy of location positioning.

5. The system of claim 4, wherein said Joint GPS/WPS position data are obtained by correcting a WPS position data of said satellite GPS receiver relative to said network communication device having GPS receiver with a known GPS position.

6. The system of claim 1, wherein said satellite GPS receiver includes a unit to perform the function of UPS positioning, Joint GPS/WPS position request to said network communication device, comparison and merge of GPS and Joint GPS/WPS positions or location-based service for navigation.

7. The system of claim 1, wherein said network communication devices including a UPS receiver has a unit to perform the function of GPS positioning, WPS positioning, Joint GPS/WPS position search and responsive to request of a satellite.

8. The system of claim 1, wherein said DSS performs the function of WPS positioning, WPS to GPS format translation, Joint GPS/WPS position library update.

9. A method of operation a dual mode positioning system having multiple network communication devices and a satellite GPS receiver coupled to a switch, wherein one of said multiple network communication devices includes a GPS receiver, said method comprising:

switching to GPS mode by said switch for satellite GPS receiver receives signals from a number of satellites;

when said GPS satellite receiver is operated in an indoor area confined by walls with wide FOV (field of view) glass window; and

switching to Joint GPS/WPS mode by said switch for said satellite GPS receiver cannot receive signals from said number of satellites when said satellite GPS receiver is operated in an indoor area confined by concrete walls or walls with narrow FOV glass window.

10. The system of claim 9, wherein in said Joint GPS/WPS mode, said satellite GPS receiver may discard null or degraded UPS position data and replace it by Joint GPS/WPS position data or coordinate degraded GPS position data with Joint GPS/WPS position data in order to improve the accuracy of location positioning.

11. The system of claim 10, wherein said Joint GPS/WPS position data is obtained by correcting a WPS position data of satellite GPS receiver relative to said network communication device having GPS receiver.

12. A method of operation a dual mode positioning system having multiple network communication devices and a satellite GPS receiver coupled to a switch, wherein one of said multiple network communication devices includes a GPS receiver, said method comprising:

receiving GPS signals from a number of satellite GPS transmitter by said network communication devices including a GPS receiver;

Location positioning to update GPS data by analyzing received GPS signals;

sending updated GPS position to DSS that has the library of static positions of multiple network communication devices and dynamic positions of satellite;

correcting GPS positions of said multiple network communication devices and said satellite;

associating with said satellite, said multiple network communication devices to perform location positioning to update WPS data;

sending updated WPS data of said satellite to said DSS; and

transforming updated WPS data to GPS format and correcting the position of said satellite based on said updated GPS data.

13. The method of claim 12, further comprising searches from the library of said DSS and responses to said satellite request for updated joint GPS/WPS position.

14. The method of claim 12, wherein said location positioning to update WPS data of that STA by hyperbolic or elliptic positioning method.

15. The method of claim 12, wherein said location positioning to update WPS data of that STA by mandatory triangulation method.

16. The method of claim 12, wherein said location positioning to update WPS data of that STA by single network communication device to satellite positioning method.

19. The method of claim 16, wherein said step of updating GPS data is performed by said satellite GPS receiver.

20. The method of claim 16, wherein said checking step is performed by said satellite GPS receiver.

17. A method of operation a dual mode positioning system having multiple network communication devices and a satellite GPS receiver coupled to a switch, wherein one of said multiple network communication devices includes a GPS receiver, said method comprising:

changing to UPS mode and receiving GPS signals from a number of satellite GPS transmitters;

updating GPS data by analyzing said received GPS signals if said satellite GPS transmitter number is sufficient, otherwise checking the valid status or the standard deviations of GPS data and performing location positioning if status is valid or if standard deviations are less than a thresholds;

changing to joint GPS/WPS mode and sending the request for updated joint GPS/WPS position to associated network communication device if said status is not valid or if said standard deviations are higher than said thresholds; and

receiving updated joint GPS/WPS data with said standard deviations from said associated network communication device.

18. The method of claim 17 further comprising a step of:

comparing said standard deviations of said updated joint GPS/WPS data with those of pure updated GPS data after receiving said updated joint GPS/WPS data;

merging two updated data by choosing the ones with better standard deviations; and

transferring said merged updated data to any location-based service system.