A Study of the Electromagnetic Compatibility of a Differential Global Positioning System Reference Station and a High Frequency Surface Wave Radar


  1. Riddolls, R.J.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
This report investigates the impact of a proposed High Frequency SurfaceWave Radar (HFSWR) transmit antenna at Hartlen Point, Eastern Passage, Nova Scotia on the operation of a Canadian Coast Guard (CCG) Differential Global Positioning System (DGPS) reference station. Two issues of concern are addressed. The first issue is the possibility that the HFSWR transmit antenna adversely affects the gain pattern of the DGPS station longwave transmit antenna. It is found that the effect of the HFSWR antenna is to reduce the gain of the DGPS transmit antenna by a maximum of 0.09 dB in the general direction of the HFSWR antenna, which results in a DGPS broadcast reception range reduction of about 1%. The second issue is the possibility that the HFSWR transmission would overload the Global Positioning System (GPS) receivers at the DGPS station. DRDC Ottawa borrowed from the CCG a spare GPS antenna and receiver unit similar to the equipment at Hartlen Point. This spare unit was exposed to High Frequency (HF) electric fields well in excess of the strength of fields expected at Hartlen Point due to HFSWR transmissions. The signal-to-noise ratio (SNR) of GPS signals from each satellite was monitored during the tests. The SNR levels were unaffected during the tests, proving that the GPS receive unit will not be affected by transmissions from an HFSWR system at Hartlen Point.

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Report Number
DRDC-OTTAWA-TM-2011-206 — Technical Memorandum
Date of publication
01 Nov 2011
Number of Pages
Electronic Document(PDF)

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