导航系统抗宽带干扰技术研究
发布时间：2019-06-06 04:50
【摘要】：随着卫星导航技术的飞速发展,各国的尖端武器对导航系统的运用,以及其他国家对本国导航系统的干扰设备不断改进,导航抗干扰系统的性能提升已经迫在眉睫。本文从这一点出发,针对目前大多数干扰信号为宽带信号这一特点,从干扰抑制基本原理入手,研究了一些常见参数对干扰抑制性能的影响。首先从卫星导航信号为扩频编码信号,卫星信号功率弱于噪声信号功率这一基本特点出发,并且在实际环境中并不能预知干扰信号的来向方位,故而引入常用于卫星信号干扰抑制的功率倒置算法,对功率倒置算法的一些基本参数进行推导和仿真研究,为实际中不同信号强度选择相应的参数提供指导。一般的空域自适应滤波处理结构在信号带宽增大以后,处理的性能会急剧下降,而实际中遇到的干扰信号的带宽通常较大,对此常用的方法是增加时间延迟抽头线,这样既简单,又能够得到很好的干扰抑制效果。但是通过时间延迟抽头来提升宽带干扰抑制性能是有条件的,本文利用干扰转换函数对此进行了详细的阐述说明以及仿真验证,表明了在抽头间距满足一定条件的情况下,增加抽头个数可以使得导航系统对宽带干扰的抑制能力与窄带干扰抑制能力相当。再者,无论何种导航系统,都包含了数十颗卫星,以北斗导航系统为例,其二代系数建成后卫星数为32颗,但是经过干扰抑制后只要能保证有4颗以上卫星的信号被准确接收,就能够有效的进行定位和导航。然而干扰信号数目通常在3个以内,这样再依靠自适应干扰抑制处理的输出信号干扰噪声比(SINR)大小的准则来判断阵列性能的好坏不是十分有用,故引入干扰增益,再结合功率倒置结构以及时间抽头延迟线模型,仿真观测各项参数对干扰抑制效果的影响,得到不同干扰环境下的最差干扰抑制能力,为实际的北斗导航抗干扰系统性能提升提供依据。最后由于实际中导航抗干扰系统的通道非理想因素导致阵列性能的下降,针对这一非理想因素,对阵列通道进行宽带的通道均衡。通过实际测量的数据进行仿真,并将均衡器运用于实际的北斗导航抗干扰系统中,能够有效的改善因为通道之间的差异导致阵列对干扰抑制效果的下降,实测数据表明通道的均衡对导航系统抗宽带干扰的性能提升有明显作用。
[Abstract]:With the rapid development of satellite navigation technology, the use of cutting-edge weapons in various countries to navigation systems, as well as the continuous improvement of interference equipment in other countries to their own navigation systems, it is urgent to improve the performance of navigation anti-interference systems. From this point of view, in view of the fact that most of the interference signals are broadband signals, starting with the basic principle of interference suppression, the effects of some common parameters on the performance of interference suppression are studied in this paper. Firstly, the satellite navigation signal is a spread spectrum coded signal, and the satellite signal power is weaker than the noise signal power, and the incoming orientation of the interference signal can not be predicted in the actual environment. Therefore, the power inversion algorithm, which is often used for satellite signal interference suppression, is introduced to deduce and simulate some basic parameters of the power inversion algorithm, which provides guidance for the selection of corresponding parameters for different signal strengths in practice. When the signal bandwidth of the general spatial adaptive filtering processing structure increases, the processing performance will decline sharply, but the bandwidth of the interference signal encountered in practice is usually larger. The common method is to increase the time delay tap line. This is not only simple, but also can get a good interference suppression effect. However, it is conditional to improve the performance of broadband interference suppression by time delay tap. In this paper, the interference conversion function is used to explain it in detail and the simulation results show that when the tap spacing meets certain conditions, By increasing the number of taps, the suppression ability of navigation system to broadband interference is similar to that of narrowband interference suppression. In addition, no matter what kind of navigation system, there are dozens of satellites, take Beidou navigation system as an example, after the completion of the second generation coefficient, the number of satellites is 32, but after interference suppression, as long as the signals of more than four satellites can be accurately received. It can effectively locate and navigate. However, the number of interference signals is usually less than three, so it is not very useful to judge the performance of the array by relying on the criterion that the interference noise of the output signal processed by adaptive interference suppression is larger than (SINR), so the interference gain is introduced. Combined with the power inversion structure and the time tap delay line model, the influence of various parameters on the interference suppression effect is simulated and observed, and the worst interference suppression ability in different interference environments is obtained. It provides the basis for the performance improvement of the actual Beidou navigation anti-interference system. Finally, because the channel non-ideal factor of navigation anti-interference system leads to the degradation of array performance, aiming at this non-ideal factor, the broadband channel equilibrium of array channel is carried out. Through the simulation of the actual measured data, and the equalizer is applied to the actual Beidou navigation anti-interference system, it can effectively improve the interference suppression effect of the array due to the difference between the channels. The measured data show that the channel equilibrium plays an important role in improving the performance of navigation system against broadband interference.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN967.1
本文编号：2494084
[Abstract]:With the rapid development of satellite navigation technology, the use of cutting-edge weapons in various countries to navigation systems, as well as the continuous improvement of interference equipment in other countries to their own navigation systems, it is urgent to improve the performance of navigation anti-interference systems. From this point of view, in view of the fact that most of the interference signals are broadband signals, starting with the basic principle of interference suppression, the effects of some common parameters on the performance of interference suppression are studied in this paper. Firstly, the satellite navigation signal is a spread spectrum coded signal, and the satellite signal power is weaker than the noise signal power, and the incoming orientation of the interference signal can not be predicted in the actual environment. Therefore, the power inversion algorithm, which is often used for satellite signal interference suppression, is introduced to deduce and simulate some basic parameters of the power inversion algorithm, which provides guidance for the selection of corresponding parameters for different signal strengths in practice. When the signal bandwidth of the general spatial adaptive filtering processing structure increases, the processing performance will decline sharply, but the bandwidth of the interference signal encountered in practice is usually larger. The common method is to increase the time delay tap line. This is not only simple, but also can get a good interference suppression effect. However, it is conditional to improve the performance of broadband interference suppression by time delay tap. In this paper, the interference conversion function is used to explain it in detail and the simulation results show that when the tap spacing meets certain conditions, By increasing the number of taps, the suppression ability of navigation system to broadband interference is similar to that of narrowband interference suppression. In addition, no matter what kind of navigation system, there are dozens of satellites, take Beidou navigation system as an example, after the completion of the second generation coefficient, the number of satellites is 32, but after interference suppression, as long as the signals of more than four satellites can be accurately received. It can effectively locate and navigate. However, the number of interference signals is usually less than three, so it is not very useful to judge the performance of the array by relying on the criterion that the interference noise of the output signal processed by adaptive interference suppression is larger than (SINR), so the interference gain is introduced. Combined with the power inversion structure and the time tap delay line model, the influence of various parameters on the interference suppression effect is simulated and observed, and the worst interference suppression ability in different interference environments is obtained. It provides the basis for the performance improvement of the actual Beidou navigation anti-interference system. Finally, because the channel non-ideal factor of navigation anti-interference system leads to the degradation of array performance, aiming at this non-ideal factor, the broadband channel equilibrium of array channel is carried out. Through the simulation of the actual measured data, and the equalizer is applied to the actual Beidou navigation anti-interference system, it can effectively improve the interference suppression effect of the array due to the difference between the channels. The measured data show that the channel equilibrium plays an important role in improving the performance of navigation system against broadband interference.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN967.1
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