Dr. Qingzhong Cai is an Associate Researcher at the School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China. He obtained a PhD degree in Optical Engineering from Beihang University in 2014. Dr. Qingzhong Cai’s research interests include inertial navigation, cooperative navigation, and digital twins. He was also rewarded an outstanding reviewer by the Institute of Physics in 2016 and by the IEEE Instrumentation and Measurement Society in 2018.