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ADC量化位数对阵列天线GNSS接收机的影响
安毅,李阳
0
(中国西南电子技术研究所,成都 610036;西南交通大学 信息科学与技术学院,成都 611756)
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 dB。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。
关键词:  全球卫星导航系统  阵列天线  抗干扰接收机  量化噪声
DOI:
基金项目:四川省科技计划重点研发项目(2018GZ0481);所级技术创新基金资助项目(H17038.1)
Influence of ADC quantization on GNSS receiver with antenna array
AN Yi,LI Yang
(Southwest China Institute of Electronic Technology,Chengdu 610036,China;School of Information Science and Technology,Southwest Jiaotong University,Chengdu 611756, China)
Abstract:
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.
Key words:  global navigation satellite system(GNSS)  antenna array  anti-jamming receiver  quantization noise
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