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Global Navigation Satellite Systems (GNSS), like GPS and Glonass, have become a standard feature in a wide range of consumer products from personal navigation devices to digital video cameras, watches, electric cars, and many more. GNSS signal power levels are weak and below the noise floor at -155 dBm. Also in many of these products, especially smart phones, strong transmitters such as WLAN and cellular can drive the GNSS LNA into compression. When the GNSS LNA is in compression, it has lower gain which causes poor GNSS reception. And when in compression, the LNA generates inter-modulation products and harmonics from the transmitter signals which can overpower the weak GNSS signals and lead to no GNSS reception. For users this could mean their position is lost while navigating.
PTM Published on: 2012-01-10