Abstract:In order to enrich the data source of GNSS-IR technology, we propose a method for soil moisture retrieval based on multipath error of BDS triple-frequency carrier phase. The results show that there is a strong correlation between the delay phase derived from the multipath error and the soil moisture, and the correlation coefficient is 0.97. Because only a few epoch multipath errors are needed, the soil moisture retrieval accuracy comparable to GNSS-IR based on signal-to-noise ratio can be obtained, so the new method makes it easier to achieve high dynamic monitoring of soil moisture.