jgg     2015 35 (5):  780-783    ISSN: 0412-1961  CN: 21-1139/TG Study on the Rapid Data Processing Method of Multi-GNSS  Zero-Difference Precise Orbit Determination 1 College of Navigation and Aerospace Engineering, Information Engineering University, 62 Kexue Road, Zhengzhou 450001, China〖JP〗 2 92493 Troops of PLA, Huludao 125000, China Received: 2014-11-11  Revised: null  Online: 2015-10-10 Supporting info