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 7,579,983 B2
• Filed: 09/05/2006
• Issued: 08/25/2009
• 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
• Primary Examiner(s): Tarcza; Thomas H
• Assistant Examiner(s): Nguyen; Nga X
• Application Number:
  US11/514,975
• Publication Number:
  US 20070063891A1
• Time in Patent Office: 1,085 Days
• Field of Search: 455/12.1, 455/313, 455/255, 34235701-35717
• US Class Current: 342/357.62
• 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:

a communication apparatus that communicates with a communication base station using a communication signal at a predetermined frequency; and

a GPS apparatus,

wherein the communication apparatus includes

a first oscillator that generates a constant reference signal used to receive the communication signal at the predetermined frequency,

an RF section that receives the communication signal using the reference signal, and outputs a base band signal of the communication signal,

a second oscillator that generates a synchronizing purpose signal used to achieve synchronization with the base band signal outputted from the RF section while changing a frequency of the synchronizing purpose signal according to a given setting parameter,

a correcting section that corrects the setting parameter so that a frequency of the base band signal coincides with the frequency of the synchronizing purpose signal, and

a base band processing section that achieves synchronization with the base band signal using the synchronizing purpose signal to reproduce a signal,

wherein the GPS apparatus includes

a positioning side reference signal generating section that generates, based on the reference signal, a positioning side reference signal that is reference for an operation of the GPS apparatus,

an error calculating section that calculates a frequency error of the reference signal using the setting parameter,

a receiving frequency estimating section that estimates a receiving frequency when receiving a satellite signal that is a signal from a positioning satellite,

a frequency range calculating section that calculates a frequency range used to search for the satellite signal based on the estimated receiving frequency and the frequency error of the reference signal, and

a satellite signal receiving section that receives the satellite signal by searching for the frequency range using the positioning side reference signal.

2. A control method for a terminal apparatus that includes a communication apparatus that communicates with a communication base station using a communication signal at a predetermined frequency and a GPS apparatus, the method comprising:

causing the communication apparatus to generate a constant reference signal used to receive the communication signal at the predetermined frequency;

causing the communication apparatus to receive the communication signal using the reference signal, and extract a base band signal of the communication signal;

causing the communication apparatus to generate a synchronizing purpose signal used to achieve synchronization with the base band signal while changing a frequency of the synchronizing purpose signal according to a given setting parameter;

causing the communication apparatus to correct the setting parameter so that a frequency of the base band signal coincides with the frequency of the synchronizing purpose signal;

causing the communication apparatus to achieve synchronization with the base band signal using the synchronizing purpose signal, and reproduce a signal;

causing the GPS apparatus to generate, based on the reference signal, a positioning side reference signal that is reference for an operation of the GPS apparatus;

causing the GPS apparatus to calculate a frequency error of the reference signal using the setting parameter;

causing the GPS apparatus to estimate a receiving frequency when receiving a satellite signal that is a signal from a positioning satellite;

causing the GPS apparatus to calculate a frequency range used to search for the satellite signal based on the estimated receiving frequency and the frequency error of the reference signal; and

causing the GPS apparatus to receive the satellite signal by searching for the frequency range using the positioning side reference signal.

3. A program that causes a computer included in a terminal apparatus to control the terminal apparatus, the terminal apparatus including a communication apparatus that communicates with a communication base station using a communication signal at a predetermined frequency and a GPS apparatus, the communication apparatus including a first oscillator that generates a constant reference signal used to receive the communication signal at the predetermined frequency, and an RF section that receives the communication signal using the reference signal, and outputs a base band signal of the communication signal, a second oscillator that generates a synchronizing purpose signal used to achieve synchronization with the base band signal while changing a frequency of the synchronizing purpose signal according to a given setting parameter, a correcting section that corrects the setting parameter so that a frequency of the base band signal coincides with the frequency of the synchronizing purpose signal, and a base band processing section that achieves synchronization with the base band signal using the synchronizing purpose signal to reproduce a signal, the program causing a computer to execute instructions comprising:

generating, based on the reference signal, a positioning side reference signal that is reference for an operation of the GPS apparatus;

calculating a frequency error of the reference signal using the setting parameter;

estimating a receiving frequency when receiving a satellite signal that is a signal from a positioning satellite;

calculating a frequency range used to search for the satellite signal based on the estimated receiving frequency and the frequency error of the reference signal; and

receiving the satellite signal by searching for the frequency range using the positioning side reference signal.

4. A terminal apparatus comprising:

a communication apparatus that communicates with a communication base station using a communication signal at a predetermined frequency; and

a GPS apparatus,

wherein the communication apparatus includes

a first oscillator that generates a constant reference signal used to receive the communication signal at the predetermined frequency,

an RF section that receives the communication signal using the reference signal, and outputs a base band signal of the communication signal,

a second oscillator that generates a synchronizing purpose signal used to achieve synchronization with the base band signal outputted from the RF section while changing a frequency of the synchronizing purpose signal according to a given setting parameter,

a correcting section that corrects the setting parameter so that a frequency of the base band signal coincides with the frequency of the synchronizing purpose signal, and

a base band processing section that achieves synchronization with the base band signal using the synchronizing purpose signal to reproduce a signal,

wherein the GPS apparatus includes

an error calculating section that calculates a frequency error of the reference signal using the setting parameter,

a positioning side reference signal generating section that generates a positioning side reference signal that is reference for an operation of the GPS apparatus by correcting a frequency of the reference signal using the frequency error calculated by the error calculating section,

a receiving frequency estimating section that estimates a receiving frequency when receiving a satellite signal that is a signal from a positioning satellite;

a frequency range calculating section that calculates a frequency range used to search for the satellite signal based on the estimated receiving frequency, and

a satellite signal receiving section that receives the satellite signal by searching for the frequency range using the positioning side reference signal.

5. A control method for a terminal apparatus that includes a communication apparatus that communicates with a communication base station using a communication signal at a predetermined frequency and a GPS apparatus, the method comprising:

causing the communication apparatus to generate a constant reference signal used to receive the communication signal at the predetermined frequency;

causing the communication apparatus to receive the communication signal using the reference signal, and extract a base band signal of the communication signal;

causing the communication apparatus to generate a synchronizing purpose signal used to achieve synchronization with the base band signal while changing a frequency of the synchronizing purpose signal according to a given setting parameter;

causing the communication apparatus to correct the setting parameter so that a frequency of the base band signal coincides with the frequency of the synchronizing purpose signal;

causing the communication apparatus to achieve synchronization with the base band signal using the synchronizing purpose signal, and reproduce a signal;

causing the positioning apparatus to calculate a frequency error of the reference signal using the setting parameter;

causing the GPS apparatus to calculate a frequency error of the reference signal using the setting parameter;

causing the GPS apparatus to generate a positioning side reference signal that is reference for an operation of the GPS apparatus by correcting a frequency of the reference signal using the frequency error;

causing the GPS apparatus to estimate a receiving frequency when receiving a satellite signal that is a signal from a positioning satellite;

causing the GPS apparatus to calculate a frequency range used to search for the satellite signal based on the estimated receiving frequency; and

causing the GPS apparatus to receive the satellite signal by searching for the frequency range using the positioning side reference signal.

6. A program that causes a computer included in a terminal apparatus to control the terminal apparatus, the terminal apparatus including a communication apparatus that communicates with a communication base station using a communication signal at a predetermined frequency and a GPS apparatus, the communication apparatus including a first oscillator that generates a constant reference signal used to receive the communication signal at the predetermined frequency, an RF section that receives the communication signal using the reference signal, and outputs a base band signal of the communication signal, a second oscillator that generates a synchronizing purpose signal used to achieve synchronization with the base band signal while changing a frequency of the synchronizing purpose signal according to a given setting parameter, a correcting section that corrects the setting parameter so that a frequency of the base band signal coincides with the frequency of the synchronizing purpose signal, and a base band processing section that achieves synchronization with the base band signal using the synchronizing purpose signal to reproduce a signal, the program causing the computer to execute instructions comprising:

calculating a frequency error of the reference signal using the setting parameter;

generating a positioning side reference signal that is reference for an operation of the GPS apparatus by correcting a frequency of the reference signal using the frequency error;

estimating a receiving frequency when receiving a satellite signal that is a signal from a positioning satellite;

calculating a frequency range used to search for the satellite signal based on the estimated receiving frequency; and

receiving the satellite signal by searching for the frequency range using the positioning side reference signal.