EXPERIMENTAL ERROR AND SIGNAL DATA FROM HIGH BIT RATE TACTICAL TROPOSCATTER DIGITAL COMMUNICATION LINK.
COOLEY ELECTRONICS LAB UNIV OF MICHIGAN ANN ARBOR
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This report describes experimental error and signal data from a 100 mile troposcatter digital communication link at a bit rate of 576 kc. A repetitive one-zero pattern with binary FM was used at 4.8 kMc. Data were taken in each of the four seasons, recording 10 to 15 six-minute tapes per season. The objective was a detailed computer analysis of error behavior, including analysis of instantaneous signal behavior so as to describe system conditions during errors. Five signals were sampled and multiplexed directly onto a digital tape AGC, Combiner, Channel A, Channel B, and local Error Count. From the equipment point of view, increases in tolerable fade length do not appear profitable until one exceeds 30 to 50 milliseconds. Further increases sharply reduce the probability of encountering such fades. Finally, the results verified that there is little signal variation from season to season except varying median level. In general, the data analyzed here permit determining the requirements for synchronization circuits of the fading link. In addition, the data here serve an indicator of what can be expected with 100 mile troposcatter links at a bit rate of 576 kc. Author
- Radiofrequency Wave Propagation
- Radio Communications