ADC量化位数对阵列天线GNSS接收机的影响
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摘要
在处理全球卫星导航系统(Global Navigation Satellite System,GNSS)卫星信号时,针对模数转换器(Analog-to-Digital Converter,ADC)量化位数不同导致输出的信号信噪比下降的问题,推导了阵列天线波束形成后输出信号的信噪比理论计算模型,分析了ADC量化位数对阵列天线抗干扰GNSS接收机的性能影响。在7阵元天线且ADC量化位数为10的条件下,理论模型分析和数据仿真结果表明最大抗干扰能力约为85 d B。通过确定ADC量化位数与抗干扰GNSS接收机抗干扰能力之间的关系,其结论为工程应用中抗干扰GNSS接收机的ADC选型和设计提供了理论依据。
In processing global navigation satellite system( GNSS) signal,the signal-to-noise ratio( SNR)is weakened because of the quantization error of analog-to-digital converter( ADC).A theoretical calculation model of SNR is deduced after beamforming processing,and the influence of ADC quantization bits on the performance of anti-jamming GNSS receiver with antenna array is analyzed.When the number of antenna array is 7 and the ADC quantization bits are equal to 10,the analysis results of theoretical model and data simulation show that the maximum anti-jamming capacity is about 85 dB.By determining the relationship between the ADC quantization bits and the anti-jamming capacity of anti-jamming GNSS receiver,this conclusion provides a theoretical basis for ADC selection and design of anti-jamming GNSS receiver in engineering application.
In processing global navigation satellite system( GNSS) signal,the signal-to-noise ratio( SNR)is weakened because of the quantization error of analog-to-digital converter( ADC).A theoretical calculation model of SNR is deduced after beamforming processing,and the influence of ADC quantization bits on the performance of anti-jamming GNSS receiver with antenna array is analyzed.When the number of antenna array is 7 and the ADC quantization bits are equal to 10,the analysis results of theoretical model and data simulation show that the maximum anti-jamming capacity is about 85 dB.By determining the relationship between the ADC quantization bits and the anti-jamming capacity of anti-jamming GNSS receiver,this conclusion provides a theoretical basis for ADC selection and design of anti-jamming GNSS receiver in engineering application.
引文
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[12]张贤达.信号处理中的线性代数[M].北京:科学出版社,1997:127-128.
[13] XU H L,CUI X W,SHEN J N,et al.A two-step beamforming method based on carrier phases for GNSS adaptive array anti-jamming[C]//Proceedings of the 2016International Technical Meeting of The Institute of Navigation.Monterey:ION,2016:793-804.
[2]任圣君,陈少昌.模数转换器(ADC)性能对雷达系统的影响性分析[J].舰船电子工程,2017,37(10):60-65.
[3]李敏.卫星导航接收机数字波束形成关键技术研究[D].长沙:国防科学技术大学,2011.
[4]周建文.卫星导航抗干扰调零天线波束合成方法研究[D].重庆:重庆大学,2017.
[5]李阳,左芝勇,彭涛,等.导航卫星阵列天线的快速现场系统校准算法[J].电讯技术,2018,58(5):519-524.
[6]李阳.一种小尺寸极化阵列及其高精度定位波束形成[J].电讯技术,2018,58(6):631-637.
[7] SCHULTZ C,HAMMES M,KREIENKAMP R,et al.Interferer performance dependency on analog-digital-conversion of GNSS-class signals in GPS receivers[C]//Proceedings of 2010 17th IEEE International Conference on Electronics,Circuits and Systems. Athens:IEEE,2010:675-678.
[8] CHEN D P,YAN T T,JIN J,et al.A tri-mode Compass/GPS/Galileo RF receiver with all-digital automatic gain control loop[J]. Analog Integrated Circuits and Signal Processing,2012,70(1):69-77.
[9]杨伟君,张朝杰,袁铁山,等.抗干扰扩频接收机中的ADC设计[J].系统工程与电子技术,2012,34(12):2569-2573.
[10] LU Y E,YAN Y G,YUAN J G,et al.The effect of the ADC quantization on the performances of GPS receiver adaptive antenna[C]//Proceedings of 2007 IEEE Aerospace Conference.Big Sky:IEEE,2007:1-6.
[11] LU Z K,NIE J W,LI J,et al.Effect of ADC non-ideal characteristics on GNSS antenna array anti-jamming[C]//Proceedings of 2016 5th International Conference on Computer Science and Network Technology(ICCSNT).Changchun:IEEE,2016:512-516.
[12]张贤达.信号处理中的线性代数[M].北京:科学出版社,1997:127-128.
[13] XU H L,CUI X W,SHEN J N,et al.A two-step beamforming method based on carrier phases for GNSS adaptive array anti-jamming[C]//Proceedings of the 2016International Technical Meeting of The Institute of Navigation.Monterey:ION,2016:793-804.