Correlative tracking system with lock indicator
US4100503A · kind A · utility
17Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1976 |
| Grant date | Jul 11, 1978 |
| Priority date | — |
| Expiry date | Jul 21, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S331/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus for indicating whether a correlation tracking system such as a phase-locked-loop has locked onto a periodic signal or not, utilizing a quadri-correlation circuit and digitalizers for the in-phase and the quadrature correlation signals, and logic circuitry for detecting the direction of transitions in the output state combinations of the digitalizers, and for adding the detector output signal rates for obtaining lock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.