Telemetry Bandwidth Compression Using Airborne Spectrum Analyzers

In practice, most missile test signals requiring wideband telemetry channels are high-frequency random signals obtained from vibration accelerometers, etc. However, their information content is contained in their slowly-varying statistical parameters. Considered are the unique problems associated with first extracting the spectral density plot of high-frequency random signals (one of the most useful of the statistical parameters), and then presenting this to the telemeter. Design formulas are derived showing the interrelationship between the parameters of the random signal and the characteristics of the telemetry. Formulas indicating the tremendous improvement in bandwidth efficiency are also given.