Title:
POSITION CALCULATING DEVICE
Document Type and Number:
Japanese Patent JP3731686
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make judgement of failure in the calculating speed continuously even in case electric wave signals from a GPS satellite are not receivable and calculate the speed and position of a moving body accurately.
SOLUTION: An inertial navigation sensor 11 senses the acceleration and angular velocity of a moving body using an acceleration sensor and gyroscopic sensor, and a GPS receiver 1 calculates the absolute position of the moving body from the electric wave signals given from a GPS satellite. When electric wave signals from the GPS satellite are received, a navigation calculating means 12 calculates the speed and position of the moving body using the data given by the GPS receiver 1 and inertial navigation sensor 11, and calculates them using the data given by the sensor 11 when such signals are not being received, and in case the speed calculated by a failed speed judging means 14 is judged as failure, it re-calculates the speed and position of the moving body on the basis of the mean speed calculated by an at-reception mean speed calculating means 13.
Inventors:
Kurokawa Hisa
Takeshi Okada
Takeshi Okada
Application Number:
JP32548096A
Publication Date:
January 05, 2006
Filing Date:
December 05, 1996
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G01C21/00; G01S5/02; G01S19/49; G01S19/50; (IPC1-7): G01C21/00; G01S5/02; G01S5/14
Domestic Patent References:
| JP8304092A | ||||
| JP7134040A |
Attorney, Agent or Firm:
Mitsutake Murayama