中文摘要：

北斗二代卫星导航系统已有11颗北斗卫星在轨，可以提供亚太地区全天候24h定位、导航和授时服务。上海海事大学研发的北斗二代船用接收机具有北斗、GPS和北斗／GPS联合定位和导航的功能。通过使用等精度分析法，对北斗卫星导航系统星座，伪距单点定位精度数学模型和误差角度进行了分析，从可见卫星数、精度因子等方面全面分析了目前船用接收机的定位精度。实验结果表明，北斗二代船用接收机的定位精度可以满足区域船舶安全导航的需要。

英文摘要：

BD-2 having 11 Compass satellites in orbit now can provide PNT （Positioning, Navigation, and Timing） service in the Asia-Pacific region for 24 hours a day. The marine receiver developed by Shanghai Maritime University has positioning and navigation functions of BD-2, GPS and BD-2/GPS. With the equal precision measurement, the compass constellation is compared with GPS, a pseudo point positioning precision model is established and errors are analyzed. Experimental results from the VSN and DOP show that the positioning precision of the marine receiver can meet the needs of regional ship navigation safety.