CAJ | 학술논문

AGPS定位过程中需要一个辅助定位服务器向终端提供所需的辅助定位信息，设计实现了一个用于终端开发的辅助定位服务器。明确了辅助定位服务器的组网方式和外部接口，基于国际标准，结合实际算法确定了服务器的输出信息格式。设计了初步的实现方案，在VisualStudio2005环境下使用C#语言实现了该方案。为了解决辅助定位服务器在接收端发送辅助定位请求的间隔小于4S时所出现的死机现象，以及由此导致的不能连接多个客户端问题，对设计方案进行了改进，由原来收到的请求再接收和处理辅助信息改为实时接收、处理、发送，很好地解决了该问题。该辅助定位服务器方案成功实现了串口通信和有线Internet通信，完成了点到点、点到多点的数据传输。测试结果表明：该辅助定位服务器系统工作稳定、可靠，该数据格式的确定以及软件方案的实现可以顺利完成对终端接收机的定位辅助请求。
AGPS정위과정중수요일개보조정위복무기향종단제공소수적보조정위신식，설계실현료일개용우종단개발적보조정위복무기。명학료보조정위복무기적조망방식화외부접구，기우국제표준，결합실제산법학정료복무기적수출신식격식。설계료초보적실현방안，재VisualStudio2005배경하사용C#어언실현료해방안。위료해결보조정위복무기재접수단발송보조정위청구적간격소우4S시소출현적사궤현상，이급유차도치적불능련접다개객호단문제，대설계방안진행료개진，유원래수도적청구재접수화처리보조신식개위실시접수、처리、발송，흔호지해결료해문제。해보조정위복무기방안성공실현료천구통신화유선Internet통신，완성료점도점、점도다점적수거전수。측시결과표명：해보조정위복무기계통공작은정、가고，해수거격식적학정이급연건방안적실현가이순리완성대종단접수궤적정위보조청구。
In AGPS system, an AGPS server is needed to provide the assisted informa- tion to the terminals. A basic AGPS server used for terminal development is implemented in this article. The network frame and interfaces of the AGPS server are analyzed firstly; also, the output message format is specified based on the international protocol and the algorithm. Then the preliminary solution of the server is implemented with the C ;~ program language in the Visual Studio 2005 program environment. To solve the problems occurred, the solution was changed: instead of receiving and processing the assisted information after being reques- ted, in the new design, the assisted information was receiving, processing and transmit in re al time. This final solution implemented serial port and internet communication, also accom- plished point to point and point to multipoint data transmission. The test results indicate that the solution of AGPS server has a high level of stabilization and credibility. The mes- sage format and the realization of software design can assist the terminals effectively.