二次雷达探测建模与仿真研究

发布时间：2018-10-09 09:15

【摘要】：二次雷达因为具备对目标位置、身份、高度和飞行状态等具体信息的报告,目前已广泛运用于军用和民用航空管制系统中,随着空中交通流量的不断增加,现有的空管系统已不能满足日益繁重的空中交通管制。并且在空中管制过程中,由于地面站二次雷达询问机的询问频率都是1030MHz,机载应答机的应答频率为1090MHz,因此,虚假目标会因为目标距离过近时同频干扰的产生而存在。除此之外,应答信号在传输过程中,会因为存在反射而导致产生多径干扰目标。这些干扰的存在都会对管制员的工作和空中交通的有序进行造成很大的影响,必须在空管系统中对二次雷达的干扰目标进行识别与抑制。本论文在各类干扰的产生的机理与信号特性分析的基础上,从二次雷达数据A/C/S模式层面,针对二次雷达的干扰行成原因及对探测结果的影响问题,分析了同步干扰、异步干扰、多径干扰等对探测结果的影响。结合工程实践,提出一系列的建模与仿真方法,将信号层面的探测仿真转化为数据流的探测仿真,建立目标轨迹运动过程,使用matlab软件进行仿真实验,采用改进的自适应hough变换与逻辑法处理雷达航迹,将目标干扰在仿真结果雷达航迹中彰显出来。实验结果表明,该建模仿真研究极大地符合实际过程中的二次雷达探测原理,使的该建模过程可以用于后续工程软件的开发之中,对二次雷达探测仿真软件的研制提供有力的支持,减少二次雷达研究过程中支出,提供可靠的数据。
[Abstract]:Secondary radar has been widely used in military and civil aviation control systems because of the reports of specific information such as target location, identity, altitude and flight status. With the increase of air traffic flow, The existing air traffic control system can no longer meet the increasingly onerous air traffic control. In the process of air control, because the second radar interrogator of ground station is 1030MHz, and the answering frequency of transponder is 1090MHz, the false target will exist because the target is too close to the same frequency interference. In addition, in the transmission process, the response signal will cause multipath interference due to the presence of reflection. The existence of these disturbances will have a great impact on the work of controllers and the orderly operation of air traffic. It is necessary to identify and suppress the jamming targets of the secondary radar in the air traffic control system. Based on the analysis of the mechanism and signal characteristics of various kinds of jamming, this paper analyzes the synchronous jamming and asynchronous jamming from the A/C/S mode level of the secondary radar data, aiming at the causes of the secondary radar jamming and its influence on the detection results. The influence of multipath interference on the detection results. Combined with engineering practice, a series of modeling and simulation methods are put forward. The signal level detection simulation is transformed into the data stream detection simulation, the target trajectory motion process is established, and the simulation experiment is carried out by using matlab software. The improved adaptive hough transform and logic method are used to deal with the radar track, and the target jamming is demonstrated in the simulation results. The experimental results show that the modeling and simulation research accords with the principle of the secondary radar detection in the actual process, and the modeling process can be used in the development of the subsequent engineering software. It provides powerful support for the development of secondary radar detection simulation software, reduces the expenditure in the process of secondary radar research, and provides reliable data.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN958.96

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