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TELEMETRY TUTORIAL

Preface

Introduction

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

Ground System

Setup & Control

PCM Stream Reconstruction

Frame Synchronization

Decomutation

Simulation & Encoding

Real-Time Processing

Real-Time Displays

Archiving

Data Distribution

Post-Test Analysis

Additional Sources
Glossary

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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.