1. School of Information and Communications Guilin University of Electronic Technology Guilin 541004 China
2. Institute of Electronics, Communications and Information Technology Queen's University of Belfast Belfast BT3 9DT UK
3. The Institute of Sensors, Signals and Systems Heriot‐Watt University Edinburgh EH14 4AS UK
4. State and Local Joint Engineering Research Centre for Satellite Navigation and Location Service Guilin University of Electronic Technology Guilin 541004 China