Accession Number:

AD0902976

Title:

Digital Equipment Susceptibility.

Descriptive Note:

Final rept. 1 Sep 70-28 May 72,

Corporate Author:

MARTIN MARIETTA CORP ORLANDO FLA

Report Date:

1972-08-01

Pagination or Media Count:

146.0

Abstract:

This report presents the results of a 22-month investigation concluded on 28 May 1972 into measurement procedures and techniques for electromagnetic susceptibility testing of digital receiving equipment DRE. The findings of the first six quarters of effort are summarized with the major effort relative to Susceptibility testing reported in detail in this report. Analytical predictions relative to bit error rate BFR and data baseband zero-crossing jitter are summarized as well as measured performance VALUES OBTAINED FROM THE ANALOG COMPUTER SIMULATION OF THE 40-PHASE DPSK and PCM-FM receiver-demodulator. Simulation results review has been instrumental in specifying relevant susceptibility test procedures, instrumentation, and limits. Calculation of interference levels in a typical Army deployment indicate interference field strengths on the order of 1Vm to 100Vm from HF-VHF, UHF, and radar transmitters. Only minor modifications to the intent and procedures of MIL-STD-461, -2, and -3, are recommended for DRE. The BER measures are the prime measure of susceptibility with decision process jitter recommended as an augmenting measure to speed testing time. Alternative instrumentation is discussed with typical circuit designs offered. Three basic test proceduresinstrumentations are sufficient for the various conducted and radiated susceptibility tests a signal level near maximum receiver sensitivity, a relatively strong signal to produce essentially zero BER, and no pilot signal. Susceptibility limits are maximum specified error rate, occurrence of any errors, and any response indicative of desired signal presence, respectively. Author

Subject Categories:

  • Electricity and Magnetism
  • Radiofrequency Wave Propagation
  • Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE