This paper describes the influence by jamming signals of different types on the ability of GPS receivers to acquire and track satellites under various circumstances. An advanced GPS simulator system has been used, and the effects of six different jamming/interfering signals have been investigated. Three different receiver types have been tested. Seven scenarios have been developed and run, six of them including jamming signals. In order to isolate the effects of the jamming signal types, as many variables as possible have been kept identical in the different scenarios. These "static" variables include, among others, receiver position, GPS signal level and UTC of the scenario runtime. Only the jamming signal types are changed from scenario to scenario. When in tracking mode, the receivers were found to be most vulnerable to the FM-rype jamming signal and least vulnerable to the noise-type jamming signal. In the acquisition mode, it was found that the swept-cw jamming signal was the most efficient and that the noise-type again was the least efficient in jamming the GPS-receiver.
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