Table 1 Detail of the radio links used in the investigation
Radio path | Transmitter | Receiver | Geographic Azimuth (degree) | Geomagnetic Azimuth (degree) | Path length (km) |
|---|---|---|---|---|---|
Link 1 | Lianyungang | Xi’an | 86.8° | 90.1° | 946 |
Link 2 | Deqing | Xi’an | 109.3° | 112.5° | 994 |
Link 3 | Linchuan | Xi’an | 138.4° | 141.6° | 1004 |