Title:
GPS RECEIVING APPARATUS
Document Type and Number:
Japanese Patent JP3748805
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a GPS receiving apparatus in which a CN threshold is changed adaptively so as to be matched to the usage environment of the GPS receiving apparatus and in which a signal and disturbance waves can be always discriminated irrespective of the installation environment of a GPS antenna.
SOLUTION: The maximum value of the received CN of a signal from each receivable satellite at a time when a satisfactory GPS reception is obtained is stored, and the mean value of the stored maximum value is found so as to be a CN-max at a stage in which the satisfactory GPS reception is continued for a prescribed time. By referring to a table in which an optimum CN threshold is made to correspond in each reception CN, a CN threshold with reference to the CN-max is acquired. The update of the CN-max and the update of the CN threshold are performed continuously, and a satellite to be used for a positioning operation is decided by using the obtained CN threshold.
Inventors:
Mutsumi Ito
Application Number:
JP2001340795A
Publication Date:
February 22, 2006
Filing Date:
November 06, 2001
Export Citation:
Assignee:
Clarion Co., Ltd.
International Classes:
G01C21/00; G01S19/22; G01S19/24; G08G1/0969; (IPC1-7): G01S5/14; G01C21/00; G08G1/0969
Domestic Patent References:
| JP9304502A | ||||
| JP2001264076A | ||||
| JP5007195A | ||||
| JP5048571A | ||||
| JP2000252879A | ||||
| JP2001272451A |
Other References:
Waldemar Kunysz,High Performance GPS Pinwheel Antenna,ION GPS 2000,2000年 9月,pages 2506-2511
Barry Price,Selective GPS Jamming,ION GPS 2000,2000年 9月,pages 2096-2104
Barry Price,Selective GPS Jamming,ION GPS 2000,2000年 9月,pages 2096-2104
Attorney, Agent or Firm:
Shuhei Matsuoka