15 results about "Chip-scale atomic clock" patented technology

The invention relates to the technical field of atomic frequency standards, in particular to a miniaturized atomic beam clock physical system and a clock generation method. The atomic beam clock physical system comprises an alkali metal atom emission cavity, an alkali metal raw material block, a microcapillary array, a drift cavity, a multi-layer silicon substrate, a laser, an optical fiber type phase modulator, a beam splitter prism, a plurality of reflectors and a signal detector. Compared with a traditional coherent population detection mode based on a bubble chamber, the chip-scale atomic clock has narrower fluorescence spectrum width and higher long-term frequency stability, meanwhile has the chip-scale capability, and has higher competitiveness compared with an existing chip-scale atomic clock based on an air chamber structure.

The invention relates to a three-dimensional integrated complete machine system of a chip-scale atomic clock. The device comprises an energy supply battery, a crystal oscillator and a stacking base which are arranged on a PCB (Printed Circuit Board), an integrated stacking assembly and a stacking upper cover are sequentially arranged on a stacking base, the integrated stacking assembly is of a hollow structure, the stacking base, the integrated stacking assembly and the stacking upper cover are stacked to form a stacking base body structure with a cavity, and a chip-level atomic clock physical system is placed in the cavity of the stacking base body. A magnetic isolation material layer is arranged on the surface of an inner cavity of the stacking base body, and IC chips and protective shells are arranged on the four surfaces of the outer side of the stacking base body. Electrical three-dimensional transmission is carried out in the stacked substrate through the through hole structure filled with the copper columns and the rewiring layer, and mutual communication among the PCB, the physical system and the IC chip is achieved. And three-dimensional integration of the atomic clock complete machine system structure is realized.

The application discloses a kind of high-precision Beidou time service master clock devices based on double-chip atomic clock fusion, it relates to timing synchronization technical field, the device includes satellite receiving module, master control processing module, double-chip atomic clock module, clock taming module, time-frequency output module, display control module and power module;Each module is cooperated by work mode automatic switching mechanism Work;Double-chip atomic clock module adopts two pieces chip level atomic clock and constitutes master-slave redundant architecture, and the phase and frequency deviation information of main atomic clock and slave atomic clock are fused and mutually checked by extended Kalman filtering;The taming algorithm in clock taming module is formed by extended Kalman filtering link, PID controller link, digital phase-locked loop link cascade;Work mode automatic switching mechanism is according to the automatic switching of work mode according to the operating state of the device;Overcome the insufficient of time service precision, low reliability, taming algorithm performance is limited and so on in prior art.

The present application relates to the field of atomic clock manufacturing technology, specifically, to a micro-physical system suitable for chip-level atomic clock manufacturing, including a packaging component, a light source component, a micro-gas chamber component and a light detection component, wherein: the packaging component includes a getter, a ceramic cover and a ceramic seat; the light source component is located directly above the ceramic seat; the micro-gas chamber component is arranged directly above the light source component and is located at the center of the closed chamber; the light detection component is arranged directly above the micro-gas chamber component; the light detection component and the light source component are upper and lower buckled structures, which together cover the micro-gas chamber component in the middle. The various components inside the present application adopt a modular design and can be directly assembled by automated assembly equipment. The structure is simple, the manual assembly links are reduced, the production efficiency and consistency are improved, and the low-cost and batch manufacturing of chip-level atomic clock products is realized.

The invention relates to an underground time synchronization system for a coal mine. The underground time synchronization system comprises a master clock, the master clock receives satellite time service calibration and is used for providing an underground clock reference source, the master clock is a chip-level atomic clock, and the master clock is switched to a local time keeping mode under the abnormal condition of satellite time service; the slave clock is arranged at a time client of the underground terminal equipment of the coal mine, and the master clock continuously gives time to the slave clock through the underground industrial Ethernet by adopting IEEE 802.1 AS protocol communication of the TSN, and the slave clock is arranged at a time client of the underground terminal equipment of the coal mine. The master clock is connected to a TSN switch in the industrial Ethernet and broadcasts time information to the slave clock in a gPTP message form. According to the underground time synchronization system, satellite time service calibration and a chip-level atomic clock are adopted, and the system is switched to a local time keeping mode when satellite time service is abnormal, so that high-precision time synchronization between equipment is still kept under the extreme conditions of underground power failure and the like.

The present invention discloses a high-precision hierarchical classification time synchronization service method and device suitable for complex environments in dense forests, and belongs to the field of time synchronization technology. The present invention provides time synchronization services for surrounding node devices through chip-level atomic clocks, satellite navigation receiving boards, processors, UWB ranging communication modules, and NTP timing service modules. In response to the problem of GNSS time service capability failure caused by severe obstruction of satellite navigation signals and severe multipath problems in dense forest environments, the present invention relies on prior conditions such as the precise knowledge of monitoring and surveillance deployment points and the inherent properties of the performance characteristics of the built-in chip atomic clocks in the equipment, and proposes technologies such as GNSS single-star timing, UWB / NTP time classification calibration, and online error compensation constrained by the prior information of the local atomic clock under known coordinates. It can provide different types of time services such as physical signal level, wired network level, and wireless information service level for different network user nodes such as monitoring and scheduling in dense forest environments.

A multi-purpose application chassis may provide multiple mission services and includes a chassis housing having a front-mounted display interface, one or more rear-mounted input / output (I / O) connectors, a first front-mounted slot configured for a removable encryptor module, and a second front-mounted slot configured for a removable baseboard module. The removable baseboard module includes a first programmable logic to provide zero root of trust, second programmable logic for I / O and network processing, a chip scale atomic clock (CSAC) configured as a master time source, a plurality of storage drives for network attached storage (NAS), and a plurality of transceivers to provide I / O between the I / O connectors and the first and second programmable logic. The first slot and storage drives are configured to handle COTS SATA encryption modules as well as PCIe encryption modules, and when installed can provide Data-at Rest (DAR) NAS.

The present invention relates to the field of atomic frequency standards, and more specifically to a miniaturized atomic beam clock physics system and clock generation method. The atomic beam clock physics system comprises an alkali metal atom emission cavity, an alkali metal raw material block, a microcapillary array, a drift cavity, a multilayer silicon substrate, a laser, a fiber-optic phase modulator, a beam splitter, a plurality of reflectors, and a signal detector. Compared to conventional bubble chamber-based coherent population detection methods, the present invention has a narrower fluorescence spectrum width and higher long-term frequency stability. It also has the capability of being fabricated on a chip, making it more competitive than existing chip-scale atomic clocks based on gas chamber structures.

A chip-scale atomic clock, according to one embodiment of the present invention, comprises: a vapor cell comprising a semiconductor substrate having a cavity for receiving alkali metal vapor therein, an upper transparent substrate disposed on the upper surface of the semiconductor substrate, and a lower transparent substrate disposed on the lower surface of the semiconductor substrate; an upper alignment part disposed on the upper transparent substrate; and a lower alignment part disposed on the lower transparent substrate. The upper alignment part and the lower alignment part are in contact with each other, and the vapor cell is inserted into a recess formed in the upper alignment part and the lower alignment part so as to be aligned.

The invention provides a CSAC-based miniature PNT system high-reliability clock synchronization method, and the method comprises the steps: firstly, obtaining a 1pps signal of a CSAC and a 1pps signal of a GNSS in real time, and calculating a clock difference signal; under the condition that the GNSS signal is effective, whether the clock difference signal is larger than a preset threshold value or not is judged, and if the clock difference signal is larger than the threshold value, a coarse adjustment function of the chip-level atomic clock is started; otherwise, performing the following fine adjustment operation; and if the 1pps signal of the GNSS fails, the system automatically starts a clock holding function, and the time precision of the CSAC is predicted and maintained through an extended Kalman filtering method, so that the relatively high time synchronization precision can still be maintained during the loss of the GNSS signal. Once the GNSS signal recovers, the system will exit the clock hold mode and perform time synchronization with the GNSS again. According to the invention, the clock synchronization problem between the CSAC and the GNSS is solved, so that the high-precision time synchronization of the system is ensured, and the reliability of the system is remarkably enhanced.

The present invention relates to the technical field of atomic frequency standards, and in particular to a miniaturized atomic beam clock physics system and a clock generation method. The atomic beam clock physics system comprises: an alkali metal atom emission cavity, an alkali metal raw material block, a microcapillary array, a drift cavity, a multilayer silicon substrate, a laser, a fiber-optic phase modulator, a beam splitter prism, a plurality of reflecting mirrors, and a signal detector. Compared with a conventional coherent population trapping detection method based on a vapor cell, the present invention achieves a narrower fluorescence spectrum width and higher long-term frequency stability, also has a chip‑level integration capability, and has higher competitiveness compared with existing chip-scale atomic clocks based on a vapor cell structure.

The invention discloses a high-sealing miniature atomic gas chamber for quantum sensing, which sequentially comprises a first glass substrate, a second glass substrate and a third glass substrate from top to bottom, the second glass substrate is internally provided with an atmosphere chamber cavity for accommodating buffer gas and atom steam, a small rubidium source cavity for placing a solid rubidium source and a micro-pore channel for connecting the large cavity and the small cavity to release rubidium atoms; the light-passing windows of the first glass substrate and the third glass substrate are respectively aligned with the atmosphere chamber cavity to form a double-end optical path; the invention further discloses a manufacturing method. According to the invention, a three-layer glass structure is adopted, femtosecond laser cutting and welding are carried out, local gold plating is carried out to enhance absorption, and the high-sealing micro atomic gas chamber is suitable for high-precision quantum sensing equipment such as chip-level atomic clocks, atomic magnetometers and quantum gyroscopes.

In one example, a method includes receiving, from a CSAC, an indication of a difference between a phase of a GNSS 1PPS signal output by a GNSS receiver and a phase of a CSAC 1PPS signal. The method includes determining, with a Kalman filter, a phase error estimate and a frequency error estimate for the CSAC based on the difference between the phase of a GNSS 1PPS signal output by the GNSS receiver and the phase of the CSAC 1PPS signal. The method includes disciplining, with the Kalman filter, the CSAC using coarse synchronization commands and fine steer commands, wherein the coarse synchronization commands and the fine steer commands are based on the phase error estimate and the frequency error estimate for the CSAC. The method includes detecting GNSS spoofing based on the difference between the phase of the GNSS 1PPS signal and the phase of the CSAC 1PPS signal.

The present invention provides a communication and navigation integrated high-precision relative positioning and time synchronization device and method, the device includes a satellite positioning module, an inertial sensor module, a chip-level atomic clock, a relative positioning module and a pseudo-code spread spectrum data link module; the satellite positioning module is used to output the first absolute position velocity information, absolute time information, pseudo-range and carrier phase; the inertial sensor module is used to output the second absolute position velocity information, angular velocity and acceleration; the chip-level atomic clock is used to obtain the time reference according to the absolute time information; during use, two of the devices are used in combination, and one is set as a master device and the other is set as a slave device; communication is established between the master device and the slave device through their respective pseudo-code spread spectrum data link modules to achieve time synchronization and relative positioning of the two. The present invention can solve the technical problem that the prior art cannot achieve high-precision relative positioning and time synchronization of the two coordinated parties in a complex battlefield environment.

The present invention provides a high-reliability clock synchronization method for a micro PNT system based on CSAC. First, the 1pps signal of the CSAC and the 1pps signal of the GNSS are acquired in real time to calculate the clock difference signal. When the GNSS signal is valid, it is determined whether the clock difference signal is greater than a preset threshold. If it is greater than the threshold, the coarse adjustment function of the chip-level atomic clock is enabled. Otherwise, the following fine adjustment operation is performed. If the 1pps signal of the GNSS fails, the system will automatically enable the clock hold function, and predict and maintain the time accuracy of the CSAC through the extended Kalman filter method, ensuring that a high time synchronization accuracy can be maintained during the period when the GNSS signal is lost. Once the GNSS signal is restored, the system will exit the clock hold mode and re-synchronize with the GNSS. The present invention solves the clock synchronization problem between CSAC and GNSS, thereby ensuring high-precision time synchronization of the system and significantly enhancing the reliability of the system.