Kalman predictor for providing a relatively noise free indication of the phase of a carrier laden with noise
US5062123A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1989 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Aug 16, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0057
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A receiver responsive to a noise laden phase modulated signal on a carrier hard limits the signal to derive a constant amplitude phase modulated r.f. signal. The constant amplitude phase modulated r.f. signal is supplied to processing circuitry to derive a digital signal having a value representing the phase of the noise laden carrier. A phase locked loop, including a minimum variance Kalman predictor filter, responds to the noise laden carrier to derive a relatively noise free indication of carrier phase. The noise laden indication of phase and the relatively noise free indication of carrier phase are combined to indicate the phase of the phase modulated signal to which the receiver is responsive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.