A Study on Modulation/Demodulation for a Satellite Analog Telemetry System,

Abstract

The analog telemetry subcarrier channel for satellites employs the FSK modulation scheme. The primary information transmitted is the time of the pulse front. However, the time at which a pulse appears varies. Therefore, it is similar to the PPM-FM modulation scheme. In the demodulation process, the bandwidth is increased to improve the time resolution. However, increasing bandwidth will lower the signal-to-noise ratio of the channel and the probability of making an error is greatly increased. Hence, a suitable bandwidth must be selected. This paper discusses the principle and advantages of the cross level detection method. It is better than the fixed level detection method in time resolution and decision failure probability. (Chinese translations).

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Document Details

Document Type
Technical Report
Publication Date
May 18, 1987
Accession Number
ADA181251

Entities

People

  • Chen Yiyuan

Organizations

  • National Air and Space Intelligence Center

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Amplitude
  • Artificial Satellites
  • Bandwidth
  • Demodulation
  • Detection
  • Detectors
  • False Alarms
  • Foreign Technology
  • Frequency
  • Gaussian Distributions
  • Low Pass Filters
  • Modulation
  • Probability
  • Probability Distributions
  • Random Variables
  • Spectra

Readers

  • Radar Systems Engineering.
  • Radio communications and signal processing.

Technology Areas

  • Space