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在GNSS接收器中数字相锁循环的规范带宽的理论上限和下限
Young-Jin Song1, Thomas Pany2, Jong-Hoon Won3
1Autonomous Navigation Laboratory, Department of Electrical and Computer Engineering, Inha University, Incheon 22212, Republic of Korea.
Sensors (Basel, Switzerland)
|July 14, 2023
概括
本研究为全球导航卫星系统 (GNSS) 接收器的数字相锁环 (DPLL) 中的正常化带宽建立了理论上限和下限. 这些发现提高了DPLL的设计可靠性,通过提供超出一般近似的精确参数确定.
科学领域:
- 电气工程 电气工程
- 信号处理 信号处理
- 卫星导航 卫星导航 卫星导航 卫星导航
背景情况:
- 数字相锁环 (DPLL) 对全球导航卫星系统 (GNSS) 接收器至关重要.
- 精确确定循环噪声带宽和连贯的集成时间对于DPLL设计至关重要.
- 当前的设计实践依赖于标准化带宽的近似稳定性标准,这些标准可能不适用于所有用户.
研究的目的:
- 导出GNSS接收器中DPLLs规范化带宽的理论上限和下限.
- 为了提供一个更精确的方法来设定DPLL参数超出一般稳定性规则.
- 通过改进DPLL设计,提高GNSS接收器的可靠性和性能.
主要方法:
- 使用z平面根位置研究DPLL稳定性,考虑数字集成方法和计算延迟的上限.
- 分析了DPLL测量误差,包括热噪声,振荡器相位噪声和动态应力,用于下限.
- 利用载体与噪声密度比率值来确定测量误差与其值之间的交叉点.
主要成果:
- 确定了GNSS接收器中DPLL规范化带宽的理论上下限.
- 证明了正常化带宽的实际极限点因循环波器的顺序和实现而有所不同.
- 确定了以前没有考虑过的正常化带宽的潜在下限.
结论:
- 由此得出的理论极限为GNSS接收器中DPLL参数选择提供了更严格的方法.
- 准确的规范带宽确定对于优化 DPLL 性能和接收器可靠性至关重要.
- 这项研究为设计强大的GNSS接收器的工程师提供了宝贵的见解.
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