Frequency diversity receiving system based on cancellation of C/A code in GPS
US5093839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1991 |
| Grant date | Mar 3, 1992 |
| Priority date | — |
| Expiry date | Jan 2, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A frequency diversity receiving system is based on cancellation of a C/A (Clear/Acquisition) code in a GPS (Global Positioning System). Spread spectrum signals of a P code (Precision) code is picked up by removing, in an interference removal circuit, spread spectrum signals of the C/A code out of spread spectrum signals of L.sub.1 band which are transmitted from GPS satellites. A difference in relative delay times between the spread spectrum signals of the P code in L.sub.1 band and spread spectrum signals of the P code in L.sub.2 band, which are also transmitted from GPS satellites, is obtained in a modified DLL (Delay Locked Loop).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.