Influence of Acoustic-Gravity Waves on Propagation of Loran-C
Abstract
After improving Type PO20 Loran-C Receiver, we obtained an output of phase difference with 1 microsecond full scale and therefore increased the resolution rate of phase difference (delta)P between our clock and LC signals. When the weather changes we often record the obvious variation of (delta)P. Sometimes, the period of the variation was about 9 min and the amount of the variation of (delta)P was up to several hundred ns, and the attenuation of amplitude M of LC groundwaves was in excess of 8 db. After making a comparison between some results, we realize that the (delta)P and M of LC groundwaves were affected by acoustic gravity waves generated by cold (warm) currents or typhoons, and that the LC sky waves were affected by more acoustic-gravity waves with longer periods.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1987
- Accession Number
- ADA521209
Entities
People
- Ying Zheng
Organizations
- Purple Mountain Observatory