北斗全球报文通信系统接入能力分析与研究

Beidou Global Message Communication Access Capability Analysis and Study

北斗全球报文通信系统全面提升了短报文通信的服务能力,服务区域从亚太地区扩展到了全球,具备为用户提供一定频度的单向位置报告服务和一定频度的端到端双向报文通信能力。北斗全球报文通信系统采用多用户随遇接入的方式,具备在卫星上处理多用户接入的能力。多用户采用随机竞争的方式向报文通信系统星载接收机发出请求,实现通信功能。随着用户接入数量的增加,多用户对目标用户形成的多址干扰不容忽视。分析多址干扰的形成原因,通过频谱分离系数分析多址干扰对目标用户接入报文通信系统的载噪比的影响,并对不同用户功率与多普勒偏差条件下的多址影响进行评估。然后,搭建报文通信系统仿真平台,仿真分析报文通信系统的接入能力。最后,为了增强报文通信系统的接入能力,对后续报文通信系统的设计提出改进的建议。

Beidou global message communication system upgrading the service ability of the rough message communication service area from the Asia-pacific region extends to the world,to provide users with a certain frequency of one-way position reporting service and two-way packet end-to-end communication capabilities.The Beidou global message communication system adopts the requirements of multi-user incidental access and has the ability to handle multi-user access on the satellite.Multi-user uses random competition to send the request to the on-board operator and receiver of the message communication system to realize the communication function.With the increase of the number of users'access,the multi-user's multi-north disturbance to the target users cannot be ignored.This paper analyzes the cause of multi-access interference,analyzes the influence of multi-service interference on the airborne noise ratio of the target user's arrival on the space borne reception by means of spectrum separation coefficient,and evaluates the influence multi-access under different power production and Doppler condition.Then,built the simulation platform of the message communication system and simulate and analyze the access capability of the message communication system.Finally,in order to enhance the operation ability of datagram communication system,some suggestions are put forward for the design of future datagram communication system.