Niu makes electric kick scooters, Vespa-like sit-atop scooters, and numerous eBikes, as well as this new XQi500 motorcycle.

Abstract: Carrier phase measurement is one of the most important measurements of GNSS receiver, which can be used for precise positioning. In order to achieve a reliable and high precise position, a ...

Abstract: The performance of digital communications systems can be affected by limitations of the analog-to-digital conversion at the receiver. To cope with finite sampling frequency and limited ...