数据传输与精密测距是导航卫星实现精密定位、时间同步的前提。应用激光方式实现星间数据传输与测距，在增加系统抗干扰性、保密性、抗截获能力的同时，可以显著提高系统的通信速率与测距精度，从而增加导航卫星自主导航能力。根据星间链路特性，结合现有激光通信、测距技术提出了一种采用相干探测与数据帧相结方式的测通体制，给出了复合系统组成原理及工作流程。考虑实际导航卫星星座，应用STK 软件完成可通率、链路距离、多普勒频移等链路特性分析。在给定链路距离、光学系统参数情况下对星间链路功率进行了预算。

Data transmission and precise distance measurement are necessary to high precision orbit determination and time synchronization in navigation satellite system. The abilities of anti-interference, confidentiality and antiinterception are improved by laser transmitting data and ranging in inter-satellite. Also the ability of autonomous navigation is improved significantly. Taken the inter-satellite link characteristics, laser communication and ranging into comprehensive consideration, a kind of integration system is proposed by combination of coherent detection and data frame ranging. System principle and working process are given. According to the actual navigation satellite constellation, link characteristics such as available probability, link distance, doppler frequency shift are studied via STK software. Also link power is calculated when link distance and the parameters of optical system are given. It is used to design the laser communication and ranging integration system.