Title:
衛星ナビゲーションシステム及びナビゲーションシステム
Document Type and Number:
Japanese Patent JP3574436
Kind Code:
B2
Abstract:
A navigation system comprises a cell-phone, a base cellular telephone site, and a webserver. Each is paired with a GPS receiver. The GPS receiver associated with the cell-phone is aided with information received from the cell-site and webserver that help reduce satellite search uncertainty. Time difference and/or frequency difference measurements are taken with data collected from what the cell-phone and its GPS receiver assume to be accurate time and frequency. Correction information is used in post-processing of the velocity solutions computed by the cell-phone to arrive at more precise determinations for the system.
Inventors:
Paul Double McBurney
Arthur N. Wu
Arthur N. Wu
Application Number:
JP2002053188A
Publication Date:
October 06, 2004
Filing Date:
February 28, 2002
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
G01C21/00; G01S1/00; G01S5/10; G01S19/06; G01S19/25; G08G1/0969; H04W64/00; G01S5/14; (IPC1-7): G01S5/14; H04Q7/20
Domestic Patent References:
| JP11083976A | ||||
| JP2000055686A | ||||
| JP2001021634A | ||||
| JP11271476A | ||||
| JP10051237A | ||||
| JP9311177A |
Attorney, Agent or Firm:
Masahiko Ueyanagi
Fujitsuna Hideyoshi
Osamu Suzawa
Fujitsuna Hideyoshi
Osamu Suzawa