METHOD AND PROGRAM OF DETECTING POSITIONING SIGNALS, POSITIONING SIGNAL RECEPTION DEVICE, POSITIONING APPARATUS AND INFORMATION EQUIPMENT TERMINAL
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United States of America Patent
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Issued Date -
Jan 22, 2015
app pub date -
Feb 5, 2013
filing date -
Feb 24, 2012
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Abstract
Whether received positioning signals are target positioning signals is determined accurately. A first code phase difference of a first replica code signal of a positioning signal StA and a second code phase difference of a second replica code signal of a positioning signal StB are acquired. A first pseudorange ρ1 is calculated based on the first code phase difference and a second pseudorange ρ2 is calculated based on the second code phase difference. An absolute value of a pseudorange difference that is a differential value between the first pseudorange ρ1 and the second pseudorange ρ2 is calculated. If the absolute value of the pseudorange difference is lower than a threshold, the positioning signals of which codes are currently tracked are determined to be the positioning signals StA and StB from a target positioning satellite. If the absolute value of the pseudorange difference is higher than the threshold, cross-correlation is determined to have occurred.
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