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Optimal space communications techniques. [all digital phase locked loop for fm demodulation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Schilling, D. L. |
| Copyright Year | 1973 |
| Description | The design, development, and analysis are reported of a digital phase-locked loop (DPLL) for FM demodulation and threshold extension. One of the features of the developed DPLL is its synchronous, real time operation. The sampling frequency is constant and all the required arithmetic and logic operations are performed within one sampling period, generating an output sequence which is converted to analog form and filtered. An equation relating the sampling frequency to the carrier frequency must be satisfied to guarantee proper DPLL operation. The synchronous operation enables a time-shared operation of one DPLL to demodulate several FM signals simultaneously. In order to obtain information about the DPLL performance at low input signal-to-noise ratios, a model of an input noise spike was introduced, and the DPLL equation was solved using a digital computer. The spike model was successful in finding a second order DPLL which yielded a five db threshold extension beyond that of a first order DPLL. |
| File Size | 8003262 |
| Page Count | 219 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19740004724 |
| Archival Resource Key | ark:/13960/t3gx92x9z |
| Language | English |
| Publisher Date | 1973-07-21 |
| Access Restriction | Open |
| Subject Keyword | Frequency Modulation Digital Systems Phase Locked Systems Systems Engineering Space Communication Data Sampling Digital Filters Demodulation Real Time Operation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
