Radio noise and RFI at and near frequencies employed by Loran-C radio navigation systems were investigated in portions of Los Angeles, California. Emphasis was placed on the definition of the detailed time and frequency domain structure of noise and RFI which might degrade the reception of Loran-C signals in urban, suburban, and industrial areas of Los Angeles. The measurements were directed toward obtaining an understanding of the noise and RFI environment which would be encountered by vehicularly installed Loran-C navigation systems. Measurements were made at and around the 100 kHz band of frequencies employed by Loran-C, and they were made from a mobile van. The noise and RFI instrumentation is described in this report.
A test plan is designed to" (a) evaluate the performance of several types of LORAN-C receivers in the vicinity of both a large metropolitan and a smal...
This report presents the results obtained from a series of tests and related analyses studying the effect of harmful RF interference on LORAN-C receiv...
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United States Department of Transportation
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