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Preface
Introduction
What is Telemetry?
Telemetry Systems Overview
Airborne System
Data Acquisition
Multiplexer
Modulation
Commutation
Data Words
Common Words
Frame Synchronization Pattern
Supercommutation

Subframe Synchronization Pattern
Sub-Subframes
Embedded Asynchronous Data Streams
Ground System


Frame Synchronization
Decommutation
Simulation & Encoding
Real-Time Processing

Archiving
Data Distribution
Post-Test Analysis
Additional Sources
Glossary

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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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