| 摘要 |
PROBLEM TO BE SOLVED: To find a noise distribution value (noise average and noise dispersion) and a noise-to-signal ratio, when tracking a satellite signal from a navigation satellite such as a GPS under a very weak environment thereof in an indoor space, under a high-level structure or the like, and to allow stable frequency tracking. SOLUTION: A non-correlative signal not correlated with a reception signal from a satellite is carrier-correlated by a 1 ms correlation channel circuit 1n for a noise, to be output in every 1 ms, and a noise power dispersionσ<SP>2</SP>during the 1 ms in every 1 ms by a noise dispersion measuring instrument 4. A prescribed time (N) coherent addition is executed using the noise power dispersionσ<SP>2</SP>during the 1ms, so as to find the noise distribution value including the noise average and the noise dispersion, corresponding to the case when added by a prescribed frequency (M). COPYRIGHT: (C)2008,JPO&INPIT |
