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Disciplined rubidium oscillator for harsh environments

机译:纪律严明的oscillator振荡器,适用于恶劣环境

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A disciplined rubidium (Rb) oscillator has been developed for use in harsh environments. This oscillator operates from −40°C to +82°C, in the presence of random vibration of up to 19 g RMS; while continuously maintaining lock of both the Rb control loop and the disciplining loop. Performance under vibration is enhanced by incorporation of a quartz oscillator with active MEMS accelerometer based vibration compensation. The device warms up in less than 15 minutes, and can be disciplined to a 1 pps input, such as the signal from a GPS receiver. One of the unique features of this device is the capability to align the internally generated RF and 1 pps signals to the input 1 pps signal with a resolution of < 1 nsec. This is accomplished using a novel PLL approach for locking the internal RF signals to the disciplining 1 pps input. A number of design refinements to the Rb physics package have also been implemented which significantly improve the performance during “holdover” conditions when no disciplining signal is present. A major design goal of this device is to reduce the accumulated time error during a 24 hour holdover period to < 245 nanoseconds. The design of this device is described, and performance data is presented to demonstrate actual performance of initial production units compared to the design objectives.
机译:已经开发出一种纪律严明的oscillator(Rb)振荡器,用于恶劣的环境。该振荡器在−40°C至+ 82°C的温度范围内工作,存在高达19 g RMS的随机振动;同时持续保持Rb控制回路和训练回路的锁定。通过将石英振荡器与基于有源MEMS加速度计的振动补偿相结合,可以增强振动下的性能。该设备可在不到15分钟的时间内预热,并且可以设置为1 pps输入,例如来自GPS接收器的信号。该设备的独特功能之一是能够将内部生成的RF和1 pps信号与输入的1 pps信号对齐,分辨率小于1 ns。这是通过使用新颖的PLL方法将内部RF信号锁定到可调节的1 pps输入而实现的。还对Rb物理软件包进行了许多设计改进,这些改进可显着改善在“保持”条件下(不存在任何约束信号时)的性能。该器件的主要设计目标是将24小时保持时间内的累积时间误差降低到<245纳秒。描述了该设备的设计,并提供了性能数据以证明初始生产单元与设计目标相比的实际性能。

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