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Given the difference between the external antenna and built-in antenna, taking Zhonghaida GNSS geodesic receiver, Honor 60 and Huawei MatePad Pro as examples, 10 hours of continuous observation data were collected on campus to verify the availability of smart tablets and smart phones in Global Navigation Satellite System Interferometric Reflection (GNSS-IR) surface height monitoring. Experiments were conducted with the elevation angle intervals of 5°-20°, 5°-25° and 5°-30°, respectively, to determine the best elevation angle interval in surface height monitoring. The experimental results showed that the optimum altitude angle range of the GNSS receiver, Honor 60 and Huawei MatePad Pro is 5°-30°. Considering the results of RMSE, this study believes that the monitoring accuracy of different SNR types is G-S1C>R-S1C>C-S2I. Moreover, the surface height monitoring effect of the Zhonghaida geodesic GNSS receiver is relatively good, and the RMSE value in the experiment of 5°-30° elevation angle range is kept within 10 cm, while that of Honor 60 and Huawei MatePad Pro is within 20 cm. It can be seen from their median values that the deviation between the retrieved surface height and the measured value of the three devices is kept between-5 cm-5 cm, thus verifying the availability of smart tablets and smart phones in GNSS-IR surface height monitoring. In a word, this study gives an example to demonstrate the application of low-cost smart equipment in GNSS-IR technology. Furthermore, it lays a foundation for its application in snow depth retrieval, sea level height monitoring and soil moisture detection in the future.
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