Citation
Abstract
The 1978 Pioneer Venus (PV78) orbiter will dispatch several probes into the planet atmosphere. The telemetry from these probes will be transmitted directly to Earth as coherent, binary phase-shift-keyed (PSK) uncoded or convolutionally encoded/sequentially decoded data, These communication links will be subjected to log-normal fading due to turbulence in the atmosphere of Venus. This paper offers a theoretical model for predicting the effects of the channel fading on PV’78 telemetry performance. Because this model considers the effects of a noisy carrier reference on the telemetry performance, it permits the determination of the optimum modulation angle which minimizes the link error rate for a given system. The model predicts that the fading will cause a 1.1 to 1.3 dB increase in the signal-to-noise levels required to achieve a frame deletion rate of 10° for the PV’78 coded telemetry modes.
Details
- Volume
- 42-23
- Published
- October 15, 1974
- Pages
- 58–67
- File Size
- 700.7 KB