| 摘要 |
<p>D-? ?B JEF:eo A METHOD AND APPARATUS FOR REMOVING NOISE IN A LORAN-C NAVIGATION RECEIVER Noise generated in the front end of a LORAN-C receiver that causes noise bias interfering with carrier cycle detection is effectively removed by periodically shifting the phase of all received signals by 180.degree. in the front end of the receiver and then removing any phase shift elsewhere in the receiver where noise is no longer a problem but before the phase shift can affect time difference of signal arrival measurements normally made in LORAN-C receivers. In this manner, noise generated in the front end of the receiver is averaged out and doesn't introduce bias levels to the received signal.</p> |
