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A Method of Predicting the Interference Margin for Non-Directional Beacons.

ADA110753

Publication Date	1981
Personal Author	Luebbers, R.; Mullins, T.
Page Count	40
Abstract	The purpose of this report is to describe a new method for determining the electric field strength produced by a Non-Directional Beacon (NDB) as a function of the important parameters involved which include distance, frequency, ground conductivity, and effective isotropic radiated power (EIRP). This method enables the determination of the coverage area within which the signal level from the NDB exceeds some critical value, usually 70 microvolts per meter (peak power). Applied to another NDB which might cause interference to the first, correcting for frequency difference to account for receiver selectivity, one can determine at any point the interference margin, (i.e., the amount by which the desired NDB signal exceeds the undesired and potentially interfering signal). This interference margin must be at least 15 dB for satisfactory operation. The scope of this report includes frequencies from 190 to 535 kHz. (Author)
Keywords	Radio beacons Area coverage Electric fields Interference Directional Isotropism Field intensity Peak power Beacons Power Value Signals Radiation Conductivity Ground level NDB(Nondirectional Beacons) EIRP(Effective Isotropic Radiated Power) Interference margins
Source Agency	Non Paid ADAS Department of Transportation Federal Aviation Administration
NTIS Subject Category	76C - Navigation & Guidance System Components
Corporate Authors	Ohio Univ., Athens. Dept. of Electrical Engineering.; Federal Aviation Administration, Washington, DC. Systems Research and
Document Type	Technical Report
Title Note	Final rept. Jun 80-Dec 81.
NTIS Issue Number	198212
Contract Number	DTFA01-80-C-10072

A Method of Predicting the Interference Margin for Non-Directional Beacons.

A Method of Predicting the Interference Margin for Non-Directional Beacons.
ADA110753

Publication Date	1981
Personal Author	Luebbers, R.; Mullins, T.
Page Count	40
Abstract	The purpose of this report is to describe a new method for determining the electric field strength produced by a Non-Directional Beacon (NDB) as a function of the important parameters involved which include distance, frequency, ground conductivity, and effective isotropic radiated power (EIRP). This method enables the determination of the coverage area within which the signal level from the NDB exceeds some critical value, usually 70 microvolts per meter (peak power). Applied to another NDB which might cause interference to the first, correcting for frequency difference to account for receiver selectivity, one can determine at any point the interference margin, (i.e., the amount by which the desired NDB signal exceeds the undesired and potentially interfering signal). This interference margin must be at least 15 dB for satisfactory operation. The scope of this report includes frequencies from 190 to 535 kHz. (Author)
Keywords	Radio beacons Area coverage Electric fields Interference Directional Isotropism Field intensity Peak power Beacons Power Value Signals Radiation Conductivity Ground level NDB(Nondirectional Beacons) EIRP(Effective Isotropic Radiated Power) Interference margins
Source Agency	Non Paid ADAS Department of Transportation Federal Aviation Administration
NTIS Subject Category	76C - Navigation & Guidance System Components
Corporate Authors	Ohio Univ., Athens. Dept. of Electrical Engineering.; Federal Aviation Administration, Washington, DC. Systems Research and
Document Type	Technical Report
Title Note	Final rept. Jun 80-Dec 81.
NTIS Issue Number	198212
Contract Number	DTFA01-80-C-10072