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A study to determine the effect of 1) data power spectrum, and 2) system design parameters on aliasing and data interpolation error has been conducted. Results are applicable to time-division multiplexed telemetry systems. In particular, the results apply to the commonly used PAM-FM, PDM-FM and PCM-FM telemetry systems and PACM-FM. Data was obtained on the basis of combined analysis and experiment with emphasis on the derivation of experimentally proven design parameters. The program consisted of three phases: 1) A study was conducted to determine typical telemetry data spectra; 2) analysis was performed to predict accuracy performance of practical data and interpolation filters using selected examples; 3) experimental tests using data spectral models were performed to derive proven interpolation accuracy performance on the basis of practical filters and design parameters. The experimental tests utilized a PAM-FM system to derive an accurate measurement of attainable performance and to indicate when other equipment factors begin to impose a limit on data recovery accuracy. Spectral models representing typical spectral data characteristics are presented. In addition, some of the more important conclusions relating to operating parameters are presented.
Space Electronics and Telemetry, IRE Transactions on (Volume:SET-8 , Issue: 4 )
Date of Publication: Dec. 1962