上行信号源的星—球定位方法研究
发布时间：2018-12-20 10:40
【摘要】：地球同步卫星上行信号源定位有多种方法,目前最常用的是双星定位体制,利用两颗卫星转发信号过程中引起的时间差(DTO)和频率差(DFO)实现对发射站的定位,另外还有单星、多星等体制也可以实现定位。这些体制都无需解调和解密就可以完成定位,不但可以在卫星安全防护中用于干扰源定位,而且可以应用到地面目标的上行信号源定位,产生目标态势情报。对于双星定位体制而言,系统在突发事件中寻找满足双星条件的邻星有很大难度,于是,我们有意在低轨或地面升空平台中寻找合适的主动设备进行辅助定位,利用系留气球搭载转发设备构造主动邻星的方法就应运而生了。本文先建立了星—球组合的定位系统模型,讨论了其用于上行信号源定位的可行性,提出了该系统对于定位参数的精度要求；然后在仿真产生上行信号和参考信号的基础上,利用传统的互模糊函数的方法提取了时差频差(DTO、DFO)参数,并从实际系统出发,提出了一种基于调制域的时频分离的参数估计方法,实现了定位参数的快速准确提取；接下来利用参数估计的结果构成定位方程组,伪线性化求解方程组、迭代算法提高精度,再从新系统自身特点出发,在有效定位区域里用网格查表法定位；最后,从广义目标定位误差出发,分析了在实际星—球定位中,影响定位的几点因素,形成误差椭圆。本文的研究成果将直接应用于星—球定位平台的构建和系统试验中,为下一步搭载主动邻星系统的研制奠定理论和实践基础。
[Abstract]:There are many methods to locate the uplink signal source of geosynchronous satellite. At present, the most commonly used method is the dual satellite positioning system, which uses the time-difference (DTO) and the frequency-difference (DFO) caused by the two satellites to transmit the signal to realize the location of the transmitting station. In addition, there are single-star, multi-star system can also achieve positioning. These systems can be used not only for jamming source location in satellite security protection, but also for uplink signal source location of ground target, which can generate target situation information. For the binary satellite positioning system, it is very difficult for the system to find the neighbor that satisfies the binary satellite condition in the emergency. Therefore, we intend to find suitable active equipment in the low orbit or ground launching platform for auxiliary positioning. The method of constructing active neighbor star by means of carrying and forwarding equipment in tethered balloon emerges as the times require. In this paper, the positioning system model of the combination of star and ball is established, and the feasibility of using it to locate the uplink signal source is discussed, and the accuracy requirements of the system for positioning parameters are put forward. Then, on the basis of generating uplink signal and reference signal by simulation, the time difference frequency difference (DTO,DFO) parameters are extracted by using the traditional method of mutual ambiguity function, and based on the actual system, the time difference frequency difference (DTO,DFO) parameter is extracted. A parameter estimation method of time-frequency separation based on modulation domain is proposed, which can extract the location parameters quickly and accurately. Then using the results of parameter estimation to form the positioning equations, pseudo-linearization solution equations, iterative algorithm to improve the accuracy, and then according to the characteristics of the new system, in the effective location area using the grid lookup table method. Finally, based on the generalized target positioning error, the error ellipse is formed by analyzing several factors that affect the positioning in actual star-sphere positioning. The research results in this paper will be directly applied to the construction and system test of the star-sphere positioning platform, which will lay a theoretical and practical foundation for the next step to develop the active neighbor satellite system.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2
，
本文编号：2387881
[Abstract]:There are many methods to locate the uplink signal source of geosynchronous satellite. At present, the most commonly used method is the dual satellite positioning system, which uses the time-difference (DTO) and the frequency-difference (DFO) caused by the two satellites to transmit the signal to realize the location of the transmitting station. In addition, there are single-star, multi-star system can also achieve positioning. These systems can be used not only for jamming source location in satellite security protection, but also for uplink signal source location of ground target, which can generate target situation information. For the binary satellite positioning system, it is very difficult for the system to find the neighbor that satisfies the binary satellite condition in the emergency. Therefore, we intend to find suitable active equipment in the low orbit or ground launching platform for auxiliary positioning. The method of constructing active neighbor star by means of carrying and forwarding equipment in tethered balloon emerges as the times require. In this paper, the positioning system model of the combination of star and ball is established, and the feasibility of using it to locate the uplink signal source is discussed, and the accuracy requirements of the system for positioning parameters are put forward. Then, on the basis of generating uplink signal and reference signal by simulation, the time difference frequency difference (DTO,DFO) parameters are extracted by using the traditional method of mutual ambiguity function, and based on the actual system, the time difference frequency difference (DTO,DFO) parameter is extracted. A parameter estimation method of time-frequency separation based on modulation domain is proposed, which can extract the location parameters quickly and accurately. Then using the results of parameter estimation to form the positioning equations, pseudo-linearization solution equations, iterative algorithm to improve the accuracy, and then according to the characteristics of the new system, in the effective location area using the grid lookup table method. Finally, based on the generalized target positioning error, the error ellipse is formed by analyzing several factors that affect the positioning in actual star-sphere positioning. The research results in this paper will be directly applied to the construction and system test of the star-sphere positioning platform, which will lay a theoretical and practical foundation for the next step to develop the active neighbor satellite system.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2
，
本文编号：2387881
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