Accession Number : ADA119578

Title :   EMC Analysis of a Prototype Civil-Use GPS Receiver on Four Aircraft Configurations.

Descriptive Note : Consulting rept.,


Personal Author(s) : Mullen,Robert L

PDF Url : ADA119578

Report Date : Jul 1982

Pagination or Media Count : 73

Abstract : The analysis for each aircraft addressed the potential of interference from adjacent-signal and out-of-band transmitters. Adjacent-signal transmitters aboard the four aircraft configurations consisted of Distance Measuring Equipment interrogators, Air Traffic Control Radar Beacon System transponders, Mode S transponders, and Traffic Alert and Collision Avoidance System interrogators. The out-of-band transmitters included HF, VHF, and UHF communications equipment. The electromagnetic compatibility aspects of the GPS receiver that were examined included burnout and saturation of the limiting diode in the receiver front end, interference to signal acquisition, and interference to signal code and carrier tracking. Only radiated interference coupled from the transmit antenna to the receive antenna was examined in this analysis. Conducted interference was not considered. For the specific configurations analyzed, no potential instances of burnout or saturation of the limiting diode due to signals from individual or multiple on-board transmitters were identified. For the specific configurations analyzed, no potential instances were identified in which the interfering signal from an individual on-board transmitter exceeded the GPS interference thresholds. For the specific configurations analyzed, one potential instance was identified in which the composite interfering signal from multiple on-board transmitters exceeded the GPS interference threshold for C/A signal acquisition. Alternative actions were recommended to preclude the occurrence of interference to the GPS receiver.

Descriptors :   *Global positioning system, *Receivers, *Communication equipment, *Electromagnetic compatibility, *Aircraft, Distance measuring equipment, Collision avoidance, Carrier frequencies, Multiple operation, Limitations, Threshold effects, Acquisition, Transmitters, Avionics, Antennas, Signals, Diodes, Iodides, Onboard, Radiation, Ultrahigh frequency, Interference, Transponders, Interrogators

Subject Categories : Aircraft
      Radiofrequency Wave Propagation
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE