Multi-tone DGPS beacon transmitter and receiver
US5745075A · kind A · utility
11Cited by
3References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Jun 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1081
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus and a method for transmitting and receiving a signal having multiple tones for obviating destructive interference between a groundwave and a skywave of the signal. The multiple tones have a frequency offset that is calculated so that the destructive interference nulls for each of the tones occurs at different range distances from the transmitter thereby extending the distance over which at least one of the tones can be reliably received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.