GPS signal-to-noise measurement in weak signal and high-interference environments.
Navigation, Journal of the Institute of Navigation
83 - 94.
In GPS receivers, measurement of the carrier power-to-noise density, C/N, is important for determining whether the code and carrier tracking loops are in lock, controlling the response of the receiver to low signal-to-noise environments, and determining the signal-to-noise environment in order to assess or predict receiver performance. However, in a weak signal or high-interference environment, the C/N measurements can be very noisy. To mitigate this problem, an investigation was conducted into methods of signal-to-noise measurement. Three C/N measurement techniques were investigated by theoretical analysis and simulation study, and performance was compared with a range of different smoothing times. These were the established narrow-to-wideband power ratio method, a correlator comparison method, and a discriminator output statistics method. All were found to be suitable in low signal-to-noise environments provided long averaging times on the order of 25 s or more are used.
|Title:||GPS signal-to-noise measurement in weak signal and high-interference environments|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering|
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