Accession Number : AD0894891

Title :   Digital Equipment Susceptibility.

Descriptive Note : Quarterly progress rept. no. 6, 29 Nov 71-27 Feb 72,

Corporate Author : MARTIN MARIETTA AEROSPACE ORLANDO FL

Personal Author(s) : Baxter, Denmer Dix ; Wilson, Jay L. ; LeCain, James F.

Report Date : JUN 1972

Pagination or Media Count : 85

Abstract : Major work during this quarter has been the testing of the PCM-FM receiver-demodulator, evaluation of test results, consideration of worst case electromagnetic fields encountered in typical field deployment, and appraisal of specific test procedures and instrumentation within the confinement of MIL-STD-461 and MIL-STD-462. The rationale for recommending a specific set of interference structure and interference injection points combines results and recommendations of previous quarters' activities with the real time required for susceptibility testing of the simulation. The susceptibility test results of the PCM-FM receiver-demodulator are included along with preliminary appraisal. There were no unique susceptibility functions of the PCM-FM receiver; polarity reversals of the baseband data signal during the center of the sampling interval represented the major cause of error production. Instantaneous peak jitter in excess of approximately 70 degrees consistently produced errors. Average jitter was less consistent. Interference test results were well aligned to predictions from previous analyses. Comparison of specifications in MIL-STD-461 and MIL-STD-462 with field levels, calculated from a typical field deployment, indicate some possible suggestions for modification in the areas of like interference structures and pulsed radar interference testing.

Descriptors :   *DIGITAL SYSTEMS), (*RADIOFREQUENCY INTERFERENCE, (*RADIO RECEIVERS, VULNERABILITY), (*ELECTROMAGNETIC COMPATIBILITY, RADIO RECEIVERS), PHASE LOCKED SYSTEMS, PULSE CODE MODULATION, FREQUENCY MODULATION, DEMODULATORS, DATA TRANSMISSION SYSTEMS, STANDARDS, MILITARY REQUIREMENTS, TEST METHODS, TEST EQUIPMENT, RADIOFREQUENCY PULSES, SIMULATION, ERRORS, ELECTROMAGNETIC FIELDS.

Subject Categories : Electromagnetic Pulses
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE