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TELEMETRY TUTORIAL
PREFACE
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What is Telemetry?
Telemetry Systems Overview
AIRBORNE SYSTEM
Data Acquisition
Multiplexer
Modulation
Commutation
Data Words
Common Words
Frame Synchronization Pattern
Supercommutation
Subframe Commutation & Frame Structure
Subframe Synchronization Pattern
Sub-Subframes
Embedded Asynchronous Data Streams
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Frame Synchronization
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ADDITIONAL SOURCES
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Southern California Microwave
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TELEMETRY TUTORIAL > Airborne System

Supercommutation

 

Measurands containing higher frequency content information are sampled multiple times per minor frame.

Usually, the number of words between the supercommutated measurands are equal to accommodate the regular sampling schemes required for Fast Fourier Transform (FFT) spectral analysis of transducer output. When designing the frame, instrumentation engineers must work around the fixed positions of synchronization words. In the example below, the fastest supercommutation is only every fourth word. You could sample every third word and achieve faster results by moving the subframe sync to ensure both sync words are not contiguous.

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This presentation consists of L-3 Communications Corporation general capabilities information that does not contain controlled technical data as defined within the International Traffic in Arms Regulations (ITAR) Part 120.10 or Export Administration Regulations (EAR) Part 734.7-11.
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This website consists of L-3 Communications Corporation general capabilities information that does not contain controlled technical data as defined within the International Traffic in Arms Regulations (ITAR) Part 120.10 or Export Administration Regulations (EAR) Part 734.7-11.