Dual Band Signal for more precision in tank gauging radar

Tank gauge measurement sensors have wide application in petrochemical industries. There are different technologies used for this application, including mechanical, acoustic based and microwave-based sensors. The microwave-based sensors (i.e., radar) are more accurate since the microwave propagation speed is not affected by temperature and pressure. In this paper a dual frequency FMCW radar is proposed for tank gauge measurement. This radar system operates on two different frequencies. But the band width around any frequency is limited to 100MHz. it is shown that while the band-width is many times less than that of the conventional tank gauging radars, the accuracy (at the same SNR value) is many times better than the conventional ones.