| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To determine whether an erroneous tracking occurs or not, and eliminate its effect without subtracting a strong signal cross-correlation value from an output correlation value of a weak signal ch in an environment in which a combined signal including a weak satellite signal and a strong satellite signal is received. <P>SOLUTION: A GPS receiver includes one cross-correlation channel 30 for obtaining a cross-correlation among a type and a phase of a spread code of a strong signal channel, a frequency as a result obtained by subtracting a Doppler frequency of the strong signal channel from a Doppler frequency of a weak signal channel, a type and a phase of a spread code of the weak signal channel, and outputs cross-correlation channel correlation power. The GPS receiver obtains the strong signal cross-correlation power of the weak signal channel based on auto-correlation power of the strong signal channel×the cross-correlation channel correlation power by k1×strong signal channel, compares it with an output correlation level of the weak signal channel, and determines the erroneous tracking. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
