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
First Claim
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 includesa 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, anda 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 includesa 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, anda satellite signal receiving section that receives the satellite signal by searching for the frequency range using the positioning side reference signal.
1 Assignment
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Accused Products
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.
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Citations
6 Claims
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1. A terminal apparatus comprising:
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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.
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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:
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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.
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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:
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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.
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4. A terminal apparatus comprising:
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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.
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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:
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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.
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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:
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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.
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Specification