Since Google's announcement on GNSS raw measurements in 2016, a lot of Android smartphones have been released that provide GNSS raw measurements. They used to carry with only L1 single-frequency, so most of applications are using DGNSS or PPP, but high performance positioning techniques cannot be applied to the Real Time Kinematics (RTK). Therefore, many companies are working on developing chipsets that can be provide dual-frequency measurement to smartphones. In the meantime, in September 2017, Broadcom released BCM47755 chip which supports multi-constellations (GPS, GLONASS, Galileo, BeiDou, and QZSS) and L1/L5 dual-frequency, and now we have much more chances to estimate ionospheric delay errors and conduct dual-frequency RTK on Android devices. Especially, L5 signal is known to be less susceptible to interference, strong against to multipath, and has a high C/No compared to the L1 signal (Circiu et al. 2017). In this paper, we compared the performance of L5 frequency measurements with L1 signals from Android smartphones.

Keywords: Android smartphone, L1/L5 frequency, C/No, multipath