CAPS导航电文格式优化及其算法

导航电文是卫星定位系统中定位计算的重要基础数据之一,导航电文编排的好坏直接关系到系统定位的准确性和定位计算的效率;针对目前CAPS导航定位系统采用的超帧、帧、子帧的固定格式带来的灵活性和效率上的不足,设计了一种改进的基于数据类型分类的电文帧格式,并提出了多目标遗传优化的帧长度选择算法;实验结果表明,改进的帧格式能克服固定格式的灵活性和效率问题,多目标选择算法的应用降低了帧的开销和空闲位数,具有实用价值.

Optimization of CAPS Navigation Message Structure and Its Algorithm

Navigation message is one of the most important basic data for positioning calculation in Satellite Positioning System. The structure organization of Navigation Message is directly related to the accuracy and efficiency of the positioning system. Currently, the fixed format of super frame, frame and sub-frame of the message structure of the CAPS system brings on much shortage on system efficiency and flexibility. A new message structure based on message type is designed, and a multiple-objective genetic optimization algorithm for frame length selection is proposed, so as to lower the spending bits and idle bits.