Terminal apparatus, control method for terminal apparatus, control program for terminal apparatus, and computer readable storage medium having stored therein control program for terminal apparatus

• US 20070063891A1
• Filed: 09/05/2006
• Published: 03/22/2007
• Est. Priority Date: 09/06/2005
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Matsumoto, Kazumi
• Granted Patent: US 7,579,983 B2
• Time in Patent Office: Days
• US Class Current: 342/357.620
• CPC Class Codes: G01S 19/235 Calibration of receiver components
• CPC Class Codes: G01S 19/29 carrier including Doppler, related G01S19/246 takes precedence

Abstract

A terminal apparatus including: communication means; positioning means; and reference signal supplying means for supplying a reference signal to the communication means and the positioning means, wherein the communication means includes: synchronizing purpose signal generating means for generating a synchronizing purpose signal to achieve synchronization with a communication signal, by correcting the reference signal, and the positioning means includes: positioning side reference signal generating means for generating, based on the reference signal, a positioning side reference signal; correcting information obtaining means for obtaining from the communication means correcting information used when the synchronizing purpose signal is generated; frequency error information generating means for generating, based on the correcting information, frequency error information indicating a frequency error of the positioning side reference signal relative to the communication signal; estimated receiving frequency information generating; and so on.

Claims

1. A terminal apparatus comprising:

communication means;

positioning means; and

reference signal supplying means for supplying a reference signal to the communication means and the positioning means, wherein

the communication means includes;

synchronizing purpose signal generating means for generating a synchronizing purpose signal to achieve synchronization with a communication signal from a communication base station, by correcting the reference signal, and

the positioning means includes;

positioning side reference signal generating means for generating, based on the reference signal, a positioning side reference signal which is reference for an operation of the positioning means;

correcting information obtaining means for obtaining from the communication means correcting information used when the synchronizing purpose signal is generated by correcting the reference signal;

frequency error information generating means for generating, based on the correcting information, frequency error information indicating a frequency error of the positioning side reference signal relative to the communication signal;

estimated receiving frequency information generating means for generating estimated receiving frequency information indicating an estimated receiving frequency, by estimating a receiving frequency of a satellite signal which is a signal from a positioning satellite;

search frequency range information generating means for generating, based on the estimated receiving frequency information and the frequency error information, search frequency range information indicating a frequency range used for searching for the satellite signal; and

satellite signal receiving means for receiving the satellite signal by searching for the frequency range indicated in the search frequency range information.

2. The terminal apparatus according to claim 1, wherein

the positioning means further includes:

positioning side reference signal correcting information generating means for generating, based on the frequency error information, positioning side reference signal correcting information for correcting a frequency error of the positioning side reference signal generating means relative to the communication signal; and

frequency error correcting means for correcting, based on the positioning side reference signal correcting information, the frequency error of the positioning side reference signal generating means relative to the communication signal.

3. A control method for a terminal apparatus having communication means, positioning means, and reference signal supplying means for supplying a reference signal to the communication means and the positioning means, the method comprising the steps of:

generating, by the terminal apparatus, a synchronizing purpose signal to achieve synchronization with a communication signal from a communication base station, by correcting the reference signal in the communication means;

obtaining, by the terminal apparatus, correcting information from the communication means, the correcting information being used when the synchronizing purpose signal is generated by correcting the reference signal;

generating, based on the correcting information, frequency error information indicating a frequency error of a positioning side reference signal relative to the communication signal, the positioning side reference signal being generated based on the reference signal and being reference for an operation of the positioning means;

generating, by the terminal apparatus, estimated receiving frequency information indicating an estimated receiving frequency, by estimating a receiving frequency of a satellite signal which is a signal from a positioning satellite;

generating, by the terminal apparatus, search frequency range information indicating a frequency range used for searching for the satellite signal, based on the estimated receiving frequency information and the frequency error information; and

receiving, by the terminal apparatus, the satellite signal by searching for the frequency range indicated in the search frequency range information.

4. A control program for a terminal apparatus having communication means, positioning means, and reference signal supplying means for supplying a reference signal to the communication means and the positioning means, the program causing a computer to perform the steps of:

generating, by the terminal apparatus, a synchronizing purpose signal to achieve synchronization with a communication signal from a communication base station, by correcting the reference signal in the communication means;

obtaining, by the terminal apparatus, correcting information from the communication means, the correcting information being used when the synchronizing purpose signal is generated by correcting the reference signal;

generating, based on the correcting information, frequency error information indicating a frequency error of a positioning side reference signal relative to the communication signal, the positioning side reference signal being generated based on the reference signal and being reference for an operation of the positioning means;

generating, by the terminal apparatus, estimated receiving frequency information indicating an estimated receiving frequency, by estimating a receiving frequency of a satellite signal which is a signal from a positioning satellite;

generating, by the terminal apparatus, search frequency range information indicating a frequency range used for searching for the satellite signal, based on the estimated receiving frequency information and the frequency error information; and

receiving, by the terminal apparatus, the satellite signal by searching for the frequency range indicated in the search frequency range information.

5. A computer readable storage medium having stored therein a control program for a terminal apparatus having communication means, positioning means, and reference signal supplying means for supplying a reference signal to the communication means and the positioning means, the program causing a computer to perform the steps of:

generating, by the terminal apparatus, a synchronizing purpose signal to achieve synchronization with a communication signal from a communication base station, by correcting the reference signal in the communication means;

obtaining, by the terminal apparatus, correcting information from the communication means, the correcting information being used when the synchronizing purpose signal is generated by correcting the reference signal;

generating, based on the correcting information, frequency error information indicating a frequency error of a positioning side reference signal relative to the communication signal, the positioning side reference signal being generated based on the reference signal and being reference for an operation of the positioning means;

generating, by the terminal apparatus, estimated receiving frequency information indicating an estimated receiving frequency, by estimating a receiving frequency of a satellite signal which is a signal from a positioning satellite;

generating, by the terminal apparatus, search frequency range information indicating a frequency range used for searching for the satellite signal, based on the estimated receiving frequency information and the frequency error information; and

receiving, by the terminal apparatus, the satellite signal by searching for the frequency range indicated in the search frequency range information.