Method of Doppler estimation for IR-UWB-system based on the rake-receiver

In [1] a new scenario based on UWB-technique for transmission of data was presented, which is the rotor-telemetry. The rotor-telemetry is a special type of a radio-telemetry, where measuring data of physical parameters like pressure or temperature are captured by sensors predominantly on rotating objects such as shafts or gear parts, transmitted over special on the rotor mounted along-moved antennas and received by static antennas. The antenna on the rotor is rotating with high velocity. A new problem appears with this scenario: since such systems become faster and faster, the impact of Doppler rises significantly. The consideration of the effect of Doppler in UWB-signals is different than in narrowband signals. In narrowband systems, the Doppler shift is almost equal for all frequencies, so that the compensation is simple by translating the spectrum proportional to the carrier frequency. This assumption is no more fulfilled in UWB-systems, since the low frequencies of the band suffer less from Doppler shift than the upper ones.