| 摘要 |
PROBLEM TO BE SOLVED: To detect lock status of a spread spectrum signal. SOLUTION: An apparatus of the present invention includes a first accumulator, a first calculation unit, a second calculation unit, a second accumulator, a multiplier and a comparator. The first accumulator accumulates an in-phase integration result and a quadrature integration result over a time period. The first calculation unit determines a first evaluation value based on the accumulated in-phase integration result and the accumulated quadrature integration result. The second calculation unit processes the in-phase integration result and the quadrature integration result. The second accumulator accumulates the output of the second calculation unit over the time period. The multiplier determines a second evaluation value by the accumulated result from the second accumulator by using a predetermined value. The comparator compares the first and second evaluation results wherein the comparison result is an indicator of the lock status. COPYRIGHT: (C)2009,JPO&INPIT |
