在复杂都市环境中，全球导航卫星系统(GNSS)用户接收机所能观测到的卫星数目以及卫星的几何图形结构通常都不理想，加之GNSS容易受到诸如太阳磁暴、人为干扰等因素影响，所以依靠单纯的GNSS系统不能满足复杂都市环境中的精确定位要求。 本论文作为中国科学院“西部之光”人才培养计划中项目“基于DTMB标准的数字电视地面广播定位技术研究”中的一个子课题，主要研究将数字电视基站作为一类伪卫星增强系统，利用DTMB数字电视信号与GNSS联合测距及定位方法，解决复杂都市环境中精确定位问题。这项研究将填补我国数字电视导航定位增强技术空白，对扩充我国GNSS系统导航定位功能和性能具有重要意义。具体研究工作如下： 首先，分析DTMB系统结构与信号帧结构，以PN420模式为例研究DTMB信号帧头初始相位特性关系；建立基于DTMB-GNSS联合定位模型并进行模块功能分析。其次，分析DTMB伪距测量原理，针对DTMB信号帧特性，提出DTMB数字电视信号捕获与跟踪方法，利用Matlab仿真验证其理论可行性；在借鉴GNSS系统的基础上，研究联合定位系统的定位算法，采用线性化迭代方法进行定位解算，利用Matlab对其原理性及收敛性进行仿真验证。最后，选取中国区域定位系统(CAPS)搭建联合定位系统实验测试平台，在西安地区进行联合定位系统实测，利用实测数据画出定位打靶图并进行分析。 实验测试结果表明，利用DTMB信号能够实现伪距测量；同时，在复杂都市环境中，采用基于DTMB-GNSS联合定位系统可以实现精确定位。

Among the complex urban environment, the number of satellites and its geometry graph structure observed by Global Navigation Satellite System (GNSS) receiver is not clearly, moreover, GNSS is easy to be effected by some factors such as sun magnetic storm, manmade interference, so it can not satisfy the accurate positioning depending on GNSS system in the complex urban environment. This paper is a sub subject of the research on digital TV ground broadcasting positioning technology based on DTMB standard which is the talent culturing plan of western light as CAS, it mainly takes the digital TV base station as one kind of fake satellite enhanced system, which use the digital TV signal and GNSS unite measure distance and positioning method to solve the problem like accurate positioning in the urban environment. This research will fill the blank of our digital TV navigation enhanced technology. It is very meaningful to enlarge the function and performance of our GNSS system navigation positioning. The concrete work as following: At first, it analyzes the DTMB system structure and signal frame structure, and takes an example as PN420 mode to research the relationship of signal frame head original phase; building the model of DTMB-GNSS combined positioning and analyzing the function. Second, it analyzes the principle of measuring the fake distance of DTMB, it proposals an acquisition and tracking method based on DTMB digital TV signal, and it also verifies the theory with Matlab. Taking examples from GNSS,it researchs position algorithm of combined positioning,and uses linear iterative method to solve position equation,it also verifies the theory and convergence with Matlab.At last, it builds the combined positioning system measurement platform by choosing China area positioning system (CAPS). It implants the site measurement in Xi’an city, and it draws and analyzes the positioning target practice graph with the real test data. The experiment result indicates that it can realize the fake distance measurement with DTMB; at the same time, it can carry out the accurate positioning by adopting DTMB-GNSS combined system in the complex urban environment.