| Summary: | 碩士 === 輔仁大學 === 電機工程學系碩士在職專班 === 104 === PNDs (Portable Navigation Devices) are widely used in commercial and military applications. GNSS (global navigation satellite system) signals typically have low strengths when reaching a PND and are therefore susceptible to various interference signals. In this paper, we will study the effects of interference resulted from various sources, including electromagnetic interference, continuous-wave interference and multi-path reception interference. Furthermore, countermeasures are proposed to reduce the bad effects. Test system was built and examined to show the improvement on the quality of GNSS signals.
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