GPS receiver and navigation device

• US 6,856,904 B2
• Filed: 05/27/2003
• Issued: 02/15/2005
• Est. Priority Date: 05/24/2002
• Status: Expired due to Fees

• Current Assignee: Clarion Co., Ltd. (Faurecia SA)
• Original Assignee: Xanavi Informatics Corporation (Hitachi, Ltd.)
• Inventors: Takano, Syuichi, Uchiyama, Hiroki
• Primary Examiner(s): Marc-Coleman, Marthe Y.
• Application Number:
  US10/445,260
• Publication Number:
  US 20040049342A1
• Time in Patent Office: 630 Days
• Field of Search: 701/213, 701/214, 342/358, 342/458, 375/150
• US Class Current: 701/213
• CPC Class Codes: G01C 21/26 specially adapted for navigation in a road network
• CPC Class Codes: G01S 19/35 Constructional details or hardware or software details of the signal processing chain

Abstract

A GPS (Global Positioning System) receiver and a navigation device and system utilizing the same includes a receiver which sequentially generates GPS data including current position information, based on signals received from GPS satellites. The GPS receiver further includes at least one filter which performs filtering with respect to the GPS data sequentially generated by the receiver and generates positioning data including the current position information, and a positioning data output device which selects a filter according to a selection signal and outputs the positioning data in accordance therewith.

Claims

1. A GPS (Global Positioning System) receiver, comprising:

a receiving means which sequentially generates GPS data including current position information, based on signals received from GPS satellites;

a plurality of filtering means which perform filtering with respect to the GPS data sequentially generated by said receiving means and generate positioning data including the current position information; and

a positioning data output means which selects any one of said plurality of filtering means according to a selection signal, and outputs the positioning data generated by the filtering means thus selected.

2. A GPS receiver according to claim 1, wherein,

respective positioning precisions of said plurality of filtering means are different from one another.

3. A navigation device that is utilized being connected with the GPS receiver according to claim 1, comprising:

a navigation means which performs navigation process by use of the positioning data outputted from said GPS receiver;

a telematics means which performs telematics process by use of the positioning data outputted from said GPS receiver; and

a selection signal output means which outputs said selection signal to said GPS receiver, wherein,

said selection signal output means outputs a first selection signal as said selection signal allowing a positioning precision of said GPS receiver to be equal to or more than a predetermined value, when said navigation means utilizes said positioning data, and outputs a second selection signal as said selection signal allowing a positioning rate of said GPS receiver to be equal to or more than a predetermined value, when said telematics means utilizes said positioning data.

4. A navigation device according to claim 3, further comprising:

a positioning rate measuring means which measures the positioning rate of said GPS receiver, wherein,

said selection signal output means outputs said second selection signal, when said telematics means utilizes said positioning data and said positioning rate measured by said positioning rate measuring means is less than the predetermined value.

5. A navigation system comprising the GPS receiver and the navigation device according to claim 3.

6. A GPS (Global Positioning System) receiver, comprising:

a receiving means which sequentially generates GPS data including current position information, based on signals received from GPS satellites;

a filtering means which performs filtering with respect to the GPS data sequentially generated by said receiving means according to a given condition, and generates positioning data including the current position information; and

a positioning data output means which selects said given condition as one of a plurality of conditions being prepared according to a selection signal, provides said condition to said filtering means, and outputs the positioning data generated by said filtering means.

7. A GPS receiver according to claim 6,

according to said plurality of conditions being prepared, a positioning precision of said filtering means is made different for each condition.

8. A navigation device that is utilized being connected with the GPS receiver according to claim 6, comprising:

a navigation means which performs a navigation process by use of the positioning data outputted from said GPS receiver;

a telematics means which performs telematics process by use of the positioning data outputted from said GPS receiver; and

a selection signal output means which outputs said selection signal to said GPS receiver, wherein,

said selection signal output means outputs a first selection signal as said selection signal allowing a positioning precision of said GPS receiver to be equal to or more than a predetermined value, when said navigation means utilizes said positioning data, and outputs a second selection signal as said selection signal allowing a positioning rate of said GPS receiver to be equal to or more than a predetermined value, when said telematics means utilizes said positioning data.

9. A navigation device according to claim 8, further comprising:

a positioning rate measuring means which measures the positioning rate of said GPS receiver, wherein,

said selection signal output means outputs said second selection signal, when said telematics means utilizes said positioning data and said positioning rate measured by said positioning rate measuring means is less than the predetermined value.

10. A navigation system comprising the GPS receiver and the navigation device according to claim 8.