GNSS接收机抗干扰性能评估方法研究
发布时间：2018-11-08 07:15
【摘要】：全球导航卫星系统(Global Navigation Satellite System,GNSS)已经广泛应用于农业、工业、交通运输业以及科学研究等当今社会的各个领域。随着未来军事战争中对高精度、高效能、快速反应、灵活制导的需要,卫星导航技术将越来越广泛地应用于现代军事斗争中,发挥其不可替代的作用。然而,卫星导航系统也存在着一些缺陷,其对抗外界干扰的能力较差。如何进一步提高GNSS接收机的抗干扰性能并提出更加有效的评估方法是卫星导航研究领域的一个重要方向。本文以目前广泛应用的阵列天线接收机应用为基础,探讨对接收机进行抗干扰性能评估的方法。论文的主要工作如下:(1)建立了GNSS接收机空域和空时处理模型,以目前广泛使用的抗干扰性能评估指标——输出端信干噪比(阵列增益)为手段,研究了不同阵元、不同延迟单元、不同信号和干扰来向对天线阵抗干扰处理的性能影响。(2)分析了以阵列输出端阵列增益为指标进行抗干扰性能评估存在的不足,提出了以解扩后阵列增益作为接收机抗干扰性能的评估指标,给出了具体的计算方法。该方法避免了在抗干扰输出端进行解扩处理,能够获得更加精确的接收机抗干扰性能评估结果,仿真结果证明其有效性。(3)分析了复杂环境下接收机采用统计性能指标评估其抗干扰性能的原因,通过引入第三章提出的等效阵列增益指标提高了传统的基于统计性能指标的评估精度。针对GPS卫星星座特性分析了真实的入射角模型和传统的入射角均匀假设的不同,并根据接收机在定位和跟踪中必须要满足的一些条件扩展了接收机抗干扰性能评估指标。(4)借鉴传统的抗干扰评估系统,构建了卫星导航接收机抗干扰性能的评估模型。建立了接收机抗干扰评估指标体系,针对GNSS接收机抗干扰评估指标的相对性、模糊性,引入了一种基于模糊综合层次法的GNSS接收机抗干扰性能评估方法。评估结果证明了这种方法的有效性。
[Abstract]:Global Navigation Satellite system (Global Navigation Satellite System,GNSS) has been widely used in agriculture, industry, transportation and scientific research. With the need of high precision, high efficiency, rapid response and flexible guidance in the future military war, satellite navigation technology will be more and more widely used in modern military struggle and play an irreplaceable role. However, satellite navigation system also has some defects, its ability to resist external interference is poor. How to further improve the anti-jamming performance of GNSS receiver and propose a more effective evaluation method is an important direction in the field of satellite navigation research. Based on the widely used array antenna receiver, this paper discusses the method of evaluating the anti-jamming performance of the receiver. The main work of this paper is as follows: (1) the spatial and space-time processing models of GNSS receiver are established. Different array elements are studied by using the widely used anti-jamming performance index, the output signal-to-noise ratio (array gain). Different delay cells, different signals and different interference affect the performance of antenna array anti-jamming processing. (2) the shortcomings of array gain evaluation based on array output are analyzed. The array gain after despreading is proposed as the evaluation index of the receiver's anti-jamming performance, and the concrete calculation method is given. The method avoids despreading at the anti-jamming output, and can obtain more accurate evaluation results of the anti-jamming performance of the receiver. The simulation results show that it is effective. (3) the reason why the receiver uses statistical performance index to evaluate its anti-jamming performance in complex environment is analyzed. By introducing the equivalent array gain index proposed in chapter 3, the traditional evaluation accuracy based on statistical performance index is improved. According to the characteristics of GPS satellite constellation, the difference between the real incident angle model and the traditional assumption of uniform incidence angle is analyzed. The anti-jamming performance evaluation index of the receiver is extended according to some conditions which must be satisfied in the positioning and tracking of the receiver. (4) the evaluation model of the anti-jamming performance of the satellite navigation receiver is built based on the traditional anti-jamming evaluation system. A receiver anti-jamming evaluation index system is established. In view of the relativity and fuzziness of the anti-jamming evaluation index of GNSS receiver, a method for evaluating the anti-jamming performance of GNSS receiver based on fuzzy comprehensive hierarchy method is introduced. The evaluation results show the effectiveness of this method.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN965.5
本文编号：2317764
[Abstract]:Global Navigation Satellite system (Global Navigation Satellite System,GNSS) has been widely used in agriculture, industry, transportation and scientific research. With the need of high precision, high efficiency, rapid response and flexible guidance in the future military war, satellite navigation technology will be more and more widely used in modern military struggle and play an irreplaceable role. However, satellite navigation system also has some defects, its ability to resist external interference is poor. How to further improve the anti-jamming performance of GNSS receiver and propose a more effective evaluation method is an important direction in the field of satellite navigation research. Based on the widely used array antenna receiver, this paper discusses the method of evaluating the anti-jamming performance of the receiver. The main work of this paper is as follows: (1) the spatial and space-time processing models of GNSS receiver are established. Different array elements are studied by using the widely used anti-jamming performance index, the output signal-to-noise ratio (array gain). Different delay cells, different signals and different interference affect the performance of antenna array anti-jamming processing. (2) the shortcomings of array gain evaluation based on array output are analyzed. The array gain after despreading is proposed as the evaluation index of the receiver's anti-jamming performance, and the concrete calculation method is given. The method avoids despreading at the anti-jamming output, and can obtain more accurate evaluation results of the anti-jamming performance of the receiver. The simulation results show that it is effective. (3) the reason why the receiver uses statistical performance index to evaluate its anti-jamming performance in complex environment is analyzed. By introducing the equivalent array gain index proposed in chapter 3, the traditional evaluation accuracy based on statistical performance index is improved. According to the characteristics of GPS satellite constellation, the difference between the real incident angle model and the traditional assumption of uniform incidence angle is analyzed. The anti-jamming performance evaluation index of the receiver is extended according to some conditions which must be satisfied in the positioning and tracking of the receiver. (4) the evaluation model of the anti-jamming performance of the satellite navigation receiver is built based on the traditional anti-jamming evaluation system. A receiver anti-jamming evaluation index system is established. In view of the relativity and fuzziness of the anti-jamming evaluation index of GNSS receiver, a method for evaluating the anti-jamming performance of GNSS receiver based on fuzzy comprehensive hierarchy method is introduced. The evaluation results show the effectiveness of this method.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN965.5
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