摘要
频率源的相位噪声水平直接制约雷达的性能上限,因而低相噪频率合成技术是高性能雷达系统的一项关键技术。现有低相噪频率合成方法常用高次倍频实现,整体性能上严重依赖于低相噪晶振,成本一直居高不下。对此,提出一种低附加相位噪声频率合成方法,即采用最小化链路上附加相位噪声的技术,用普通恒温晶振级联低相噪放大器、梳状谱发生器和锁相环,最终实现低相位噪声的频率合成。实测数据表明,本文方法以100 MHz普通恒温晶振为参考,积分区间[1 kHz,30 MHz]的时间抖动为11 fs,频率合成在5.8 GHz载波的相位噪声为-119 dBc/Hz@1 kHz,积分区间[1 kHz,30 MHz]的时间抖动为13.7 fs,总附加时间抖动为8.17 fs,附加相位噪声仅1.9 dB,达到了业界领先水平,能够有效提升毫米波雷达系统的成像性能,优于传统频率合成方法。
The phase noise level of the frequency source directly restricts the upper limit of radar performance,thus low phase noise frequency synthesis is a key technology for high performance radar systems.Existing low phase noise frequency synthesis methods are often realized by high order frequency doubling,and the overall performance is heavily dependent on the low phase noise Oven Controlled Crystal Oscillator(OCXO),therefore the cost is high.In this paper,a low additional phase noise frequency synthesis method is proposed,the technique of minimizing the additional phase noise on the link is adopted,and an ordinary OCXO is employed to cascade the low phase-noise amplifier,comb generator,and phase-locked loop to ultimately realize the frequency synthesis with low phase noise.The measured data show that the proposed method uses a 100 MHz OCXO as a reference,the time jitter in the integration interval[1 kHz,30 MHz]is 11 fs,the phase noise of the frequency synthesized at the 5.8 GHz carrier is-119 dBc/Hz@1 kHz,the time jitter in the integration interval[1 kHz,30 MHz]is 13.7 fs,the total additional time jitter is 8.17 fs,and the additional phase noise is only 1.9 dB.It reaches the industry-leading level,which can effectively improve the imaging performance of millimeter-wave radar systems and outperforms the traditional frequency synthesis methods.
作者
邹海明
高伟
刘文冬
罗俊
王晶阳
ZOU Haiming;GAO Wei;LIU Wendong;LUO Jun;WANG Jingyang(Zhuhai Microcreative Tech.Co.,Ltd.,Zhuhai Guangdong 519000,China)
出处
《太赫兹科学与电子信息学报》
2024年第5期529-536,共8页
Journal of Terahertz Science and Electronic Information Technology
关键词
梳状谱
附加相位噪声
时间抖动
锁相环
频率合成
comb generator
additive phase noise
time jitter
Phase Locked Loop(PLL)
frequency synthesis
作者简介
邹海明(1983-),男,硕士,高级工程师,主要研究方向为微波毫米波频率合成与收发组件等.email:zouhaiming@microcreative.org;高伟(1987-),男,博士,高级工程师,主要研究方向为合成孔径雷达信号以及激光数字全息信号处理等;刘文冬(1986-),男,博士,高级工程师,主要研究方向为微波器件以及天线;罗俊(1986-),男,博士,高级工程师,主要研究方向为60 GHz CMOS射频收发视频传输;王晶阳(1990-),男,博士,高级工程师,主要研究方向为雷达传感感知技术、雷达成像技术等.
