Statistics – Computation
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985stin...8615333j&link_type=abstract
Unknown
Statistics
Computation
Balloon-Borne Instruments, Space Exploration, Spacecraft Communication, Spacecraft Tracking, Telemetry, Venus (Planet), International Cooperation, Venus Atmosphere, Venus Probes, Viterbi Decoders
Scientific paper
A technique is proposed to accurately estimate the Doppler frequency and demodulate the digitally encoded telemetry signal that contains the measurements from balloon instruments. Since the data are prerecorded, one can take advantage of noncausal estimators that are both simpler and more computationally efficient than the usual closed-loop or real-time estimators for signal detection and carrier tracking. Algorithms for carrier frequency estimation subcarrier demodulation, bit and frame synchronization are described. A Viterbi decoder algorithm using a branch indexing technique has been devised to decode constraint length 6, rate 1/2 convolutional code that is being used by the balloon transmitter. These algorithms are memory efficient and can be implemented on microcomputer systems.
Divsalar D.
Jurgens Raymond F.
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