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TRANSITION FROM ANALOG TO DIGITAL RECORDERS FOR TELEMETRY AT THE WESTERN RANGEHedricks, Michael J., Sussex, Jeff, Streich, Ronald G. 10 1900 (has links)
ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California / The transition of PCM recording from analog to digital recorders was completed at many test
ranges more than a decade ago as marked by delivery of data on S-VHS tape, CD-ROM, DVD,
ZIP disc, JAZ disc, 8mm tape and DLT tape for low rate data and D-1 cassettes for high rate
data. Data then quickly began distribution via the internet and other networks. Analog recorders
have remained a necessary legacy for the long transition to convert from analog to digital (PCM)
data transmission from the test vehicles. However, the new digital recorder capabilities have
removed this requirement to convert the transmissions from the test vehicle. Analog signal and
predetection recording on digital recorders has been successfully demonstrated at costs below the
existing analog recorders. Application of new techniques in a methodical transition program to
the new digital recorders has proven the many benefits of recording wider bandwidths with
excellent repeatability. Repeatability issues are primarily in the very low error sources of the
processing system because the major analog error sources of the analog tape recorders, analog
time code readers, analog demodulators, etc have been greatly reduced. This paper provides test
results of recording higher signal rates and bandwidths of the new programs and describes the
techniques and implementation through procedures of the Western Range transition from analog
to digital recorders. Surprising results show predetection and analog signal recording costs are
nearly the same as PCM recording costs due to the price of deliverable media with respect to
mission recording requirements.
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