基于非导航随机信号的组合导航技术研究

Research on Integrated Navigation Technology Based on Non-navigation Random Signal

目前,卫星导航系统已成为无处不在的导航和授时信息源,但是其自身存在固有的缺陷,如信号功率低、易被敌方压制或欺骗等。为了弥补卫星导航系统的不足,开展了基于地面数字电视广播(DTMB)和接收信号强度指示(RSSI)移动终端等非导航随机信号的导航信息提取技术研究和组合导航技术研究。根据DTMB时域PN帧头序列的良好时域相关性,联合频域传输信令,完成了数字电视信号的高精度测距;根据RSSI移动终端的无线信号传播模型和代表性实测数据,通过线性回归等数学手段对距离衰减公式进行优化,以完成移动终端相对基站的精确距离测量;根据非导航随机信号提取的导航信息,完成基于非导航随机信号的组合导航技术研究。经理论研究和试验验证,通过DTMB和RSSI移动终端等非导航随机信号可以提取高精度导航信息,组合导航技术研究能够满足高精度导航定位的应用需求,具有良好的工程应用价值。

At present,satellite navigation systems have become a ubiquitous source of navigation and timing information,but they have inherent defects,such as low signal power,easy to be suppressed or deceived by the enemy.In order to make up for the shortcomings of satellite navigation systems,we carry out research on navigation information extraction technology and integrated navigation technology based on the non-navigation random signals such as DTMB(Digital Television Terrestrial Multimedia Broadcasting)and RSSI(Received Signal Strength Indicator)mobile terminals.According to the good time domain correlation of the time domain PN frame header sequence about DTMB signals,combined with frequency domain transmission signaling,the high-precision ranging of digital television signals is completed.According to the wireless signal propagation model of RSSI mobile terminal and representative measured data,the distance attenuation formula is optimized by linear regression and other mathematical means to complete the accurate distance measurement of the mobile terminal relative to the base station.The navigation information extracted by the non-navigation random signal is used to complete the integrated navigation technology based on non-navigation random signals.Through theoretical research and experi-mental verification,high-precision navigation information can be extracted through non-navigation random signals such as DTMB and RSSI mobile terminals.The research of integrated navigation technology can meet the requirements of high-precision navigation and positioning applications and can provide valuable reference for engineering applications.