Android 智能手机海面高度测量及其遥感应用

In this paper, the sea surface height measurement was explored based on Android smartphone, assessing its performance initially through comparing the measured sea surface height from Android and geodetic receiver to the data in situ. In order to weaken the influence of the signals from the non-observation areas on the measurement of sea surface height, an empirical mode decomposition (EMD) was proposed to extract the oscillation feature from the signal reflected off sea surface. And simulation and experiment were carried out to demonstrate its significance. The GNSS data collected by Xiaomi 6 smartphone and Huace BeiDou N72 geodetic receiver in 18 days were conducted to measure sea surface height and assess the performance. The experimental results show that, when wind speed is below 15 m/s, the measured sea surface heights from smartphone and geodetic receiver are agreement with in-situ ones from tide gauge, both with the root mean square error (RMSE) of 0.31 m. There are 30.8% and 45.3% lower and upper bound of the elevation angle of the GNSS signals to be over 30°, so that Signal-to-Noise Ratio (SNR) with higher elevation angle can be used to measure sea surface height. During the experiment within 18 days, 1120 in total and 62 measurements each day are obtained, therefore, in the same measurement period, compared to CORS station, more measurements can be obtained. In addition, the remote sensing was also discussed based on smartphone to promote the practicality of generally public remote sensing.