SIGNAL CAPTURING APPARATUS AND SIGNAL CAPTURING METHOD
First Claim
1. A signal capturing apparatus comprising:
- a signal receiving section that searches for a signal which uses a predetermined clock signal as an operation clock and which is a target to capture;
a reference clock signal generating section that generates a reference clock signal which serves as a reference for a frequency of the predetermined clock signal;
a frequency comparing section that compares the frequency of the predetermined clock signal and a frequency of the reference clock signal;
a reference clock precision estimating section that estimates precision of the reference clock signal; and
a controlling section that controls correction of the frequency of the predetermined clock signal based on the reference clock signal when the precision of the reference clock signal estimated in the reference clock precision estimating section is equal to or greater than a predetermined threshold.
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Abstract
A signal capturing apparatus and a signal capturing method wherein the timing at which to implement the clock frequency correction of a GPS reception part during position determination can be optimized to prevent any search omissions, while shortening the time period required for the position determination. A cellular clock precision estimating function part (120) estimates a reception quality of wireless communication. When an estimated reception quality is equal to or greater than a predetermined threshold value, a corrected timing deciding part (140) implements a GPS clock frequency correction with the cellular clock used as a reference. When the reception quality is less than the predetermined threshold value, the corrected timing deciding part (140) inhibits the GPS clock frequency correction from being implemented with the cellular clock used as a reference.
15 Citations
11 Claims
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1. A signal capturing apparatus comprising:
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a signal receiving section that searches for a signal which uses a predetermined clock signal as an operation clock and which is a target to capture; a reference clock signal generating section that generates a reference clock signal which serves as a reference for a frequency of the predetermined clock signal; a frequency comparing section that compares the frequency of the predetermined clock signal and a frequency of the reference clock signal; a reference clock precision estimating section that estimates precision of the reference clock signal; and a controlling section that controls correction of the frequency of the predetermined clock signal based on the reference clock signal when the precision of the reference clock signal estimated in the reference clock precision estimating section is equal to or greater than a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A signal capturing method comprising:
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searching for a signal which uses a predetermined clock signal as an operation clock and which is a target to capture; comparing a frequency of a reference clock signal, which serves as a reference for the predetermined clock signal, and a frequency of the predetermined clock signal; estimating precision of the reference clock signal; and controlling correction of the frequency of the predetermined clock signal based on the reference clock signal when the estimated precision of the reference clock signal is equal to or greater than a predetermined threshold.
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Specification