JP2003114271A - Dgps system and dgps service business - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a DGPS system for equalizing the positioning precision of a GPS receiver integrated with a portable telephone to that of a DGPS receiver without adding new hardware, and to provide a DGPS processing service for realizing the DGPS system. SOLUTION: The position information obtained by the GPS receiver is sent to a DGPS service center via the portable telephone. The DGPS service center utilizes the sent position information for selecting a DGPS base station closest to the position of the GPS receiver out of a plurality of DGPS base stations and uses position correcting information obtained by the DGPS base station for correcting the sent position information to obtain corrected position information, which is transmitted to the portable telephone. The portable telephone sets the transmitted corrected position information as DGPS position information.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a GPS (Grobal P
In a mobile phone with an integrated ositioning system (receiver) function, the accuracy of the position information detected by the GPS receiver can be measured using the data transmission function of the mobile phone.
cial Grobal Positioning System) A method to improve the receiver and its service business.

[0002]

2. Description of the Related Art Conventionally, in DGPS, position correction information is calculated from position information detected by a GPS receiver of the DGPS base station in the DGPS base station and self-position information of the DGPS base station which is accurately known beforehand, and FM broadcasting The position correction information sent by FM broadcasting is broadcast by the user.
A general method is to obtain the corrected position information by correcting the position information received by the M receiver and obtained by the user's GPS receiver with the position correction information. Therefore, the conventional DGPS receiver includes the FM receiver and the G receiver in addition to the GPS receiver.
A DGPS processing unit for correcting the position information obtained by the PS receiver with the correction information obtained by the FM receiver is required.

[0003]

SUMMARY OF THE INVENTION The present invention provides a GPS receiver connected to a mobile phone or a GPS receiver integrated with the mobile phone by utilizing the mobile phone, and by using the FM receiver and the DGPS processing. D is unnecessary
A GPS receiver is provided.

[0004]

[Means for Solving the Problems] G connected to a mobile phone
In the PS receiver, the position information obtained by the GPS receiver is sent to the DGPS service center by a mobile phone. In the DGPS service center, a plurality of DGPS
The DGPS base station located closest to the position indicated by the position information received from the base stations is selected, the received position information is corrected by the position correction information, and the corrected position information is calculated, and the corrected position information is calculated. Send to the phone. The GPS
The mobile phone connected to the receiver uses the corrected position information sent as DGPS position information.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a conventional DGPS receiver configuration example, and FIG. 2 shows a DGPS system configuration example according to the present invention.

In FIG. 1, reference numeral 1 denotes a GPS receiver 2 which receives radio waves from a plurality of GPS satellites and calculates position information, and which receives an FM broadcast wave having position correction information obtained by a DGPS base station. The FM receiver 3 that outputs the position correction information by the DGPS processing unit 4 that corrects the position information that is the output of the GPS receiver 1 by the position correction information that is the output of the FM receiver 2 and outputs the corrected position information is The GPS receiver 1, FM receiver 2, and DG
It is a DGPS receiver configured by the PS processing unit 3.

In FIG. 2, reference numeral 5 denotes a GPS receiver 6 which receives radio waves from a plurality of GPS satellites and calculates position information as in the case of 1. A mobile phone base station 8 receives position information obtained from the GPS receiver 5. The mobile phone 7 having a data transmission function of transmitting to the via DGPS service center 10 or receiving the corrected position information from the DGPS service center 10 via the mobile phone base station 8 is composed of a GPS receiver 5 and a mobile phone 6. GPS
The mobile phone 8 with a receiver function receives the position information transmitted from the mobile phone 6 and transmits it to the DGPS service center 10, or transmits the corrected position information transmitted from the DGPS service center 10 to the mobile phone 6. The mobile phone base station 9 that calculates the position correction information from the position information detected by its own GPS receiver and the self-position information that is known accurately in advance, and provides the position correction information to the DGPS service center 10 Is based on the location information sent from the mobile phone 6.
The DGPS base station 9 closest to the position of the GPS receiver 5 among the plurality of DGPS base stations is selected, and the position information sent from the DGPS base station 9 is corrected to be corrected position information, The DGPS service center transmits the corrected position information to the mobile phone 6 via the mobile phone base station 8.

[0008]

According to the present invention, a mobile phone with a GPS receiver function can obtain position information with the same accuracy as a DGPS receiver without adding new hardware to the conventional GPS receiver.

[Brief description of drawings]

FIG. 1 is a conventional configuration example of a DGPS receiver.

FIG. 2 is a DGPS system configuration example according to the present invention.

[Explanation of symbols]

1 and 2, 1, 5: GPS receiver 2: FM receiver 3: DGPS processing unit 4: DGPS receiver 6: Mobile phone 7: Mobile phone with GPS receiver function 8: Mobile phone base station 9: DGPS base station 10: DGPS Service Center

Claims (2)

[Claims] 1. A GPS receiver, the position information detected by the GPS receiver is transmitted to a DGPS service center, or the corrected position information sent from the DGPS service center is received and the corrected position of the GPS receiver is received. A mobile phone as information, a plurality of DGPS base stations that calculate position correction information from position information detected by a GPS receiver that the user has and self-position information that is known in advance, and position information transmitted from the mobile phone. From the plurality of DGPS base stations, a DGPS base station located closest to the position indicated by the received position information is selected, and the received position is calculated based on the position correction information obtained by the selected DGPS base station. Comprised of a DGPS service center that corrects information, calculates corrected position information, and sends this to the mobile phone. DGPS, characterized in that
method. 2. A DGPS service business by the DGPS service center according to claim 1.