11/13/2022 0 Comments Fibre optic gyroscopeIt improved upon the first generation with a hybrid approach using an analog signal in the coil with digital signal processing. The second generation was developed in 1994 and is still used to this day. The first generation of FOG made available in 1976 used analog signals and analog signal processing. DFOG was created to meet the demand for smaller and more cost-effective FOGs, while increasing reliability and accuracy. Internal storage allows for up to 1 year of data logging.ĭFOG is patent-pending technology, which has been developed over 25 years involving two research institutions. A rich, responsive embedded web interface provides full access to all of the device’s internal functions and data. Additional features of the Boreas include Ethernet, CAN and NMEA protocols, as well as a disciplined timing server providing PTP. The system is designed for a mean time between failures of 500,000 hours. Both the hardware and software are designed and tested to safety standards and it has been environmentally tested to mil standards. It was designed for control applications, with a high level of health monitoring and instability prevention to ensure stable and reliable data.Īdvanced Navigation has designed Boreas from the ground up for reliability and availability. This algorithm is more intelligent than the typical extended Kalman filter and is able to extract significantly more information from the data by making use of human inspired artificial intelligence. The gyro compassing allows the system to determine a highly accurate heading of 0.01 degrees secant latitude without any reliance on magnetic heading or GPS.īoreas contains Advanced Navigation’s revolutionary sensor fusion algorithm. This next-generation FOG features ultra-fast gyro compassing, taking only 2 minutes to acquire heading in both stationary environments or on the move. Boreas allows for full GPS independence with dead reckoning accuracy of 0.01% distance traveled with an odometer or DVL. This allows the Boreas to achieve ultra-high roll/pitch accuracy of 0.005 degrees and heading accuracy of 0.006 degrees. The Boreas delivers strategic-grade bias stability of 0.001 deg/hr. With Boreas’ ultra-high accuracy and strategic-grade performance combined with the reduction of size, weight, power and cost by 40%, we will be able to enable new industries and applications that were never possible before.” DFOG represents a step-change for fibre optic gyroscopes. The Boreas is targeted at applications requiring always available, ultra-high accuracy orientation and navigation including marine, surveying, subsea, aerospace, robotics, and space.Īdvanced Navigation’s CEO, Xavier Orr said “Boreas is the first product on the market to offer our patent-pending DFOG technology. Boreas is the first product to be released that is based on Advanced Navigation’s new DFOG (Digital Fibre Optic Gyroscope) technology, which is the culmination of 25 years of development involving two research institutions. The ARW is improved by 4.9 dB from 1.40 to 0.45 mdeg/hour 1/2.The Boreas is an ultra-high accuracy, strategic-grade INS, offering a 40% reduction in size, weight, power, and cost relative to competing systems. The phase noise is reduced by 6 dB at the proper frequency. Adding the active FRR between the Sagnac interferometer and the broadband light, the detected power reaches 150 μW with the FOG at rest and without modulation, which is about one hundred times of the detected power when using a passive FRR. By adjusting the EDFA gain properly, a 17-dB decrease in the RIN is demonstrated, which reduces the standard deviation by 8.5 dB. The coupling ratios of the couplers in the active FRR are both 50%-50% tap. The EDFA compensates for the loss of the resonator and leads to a high finesse and a greater reduction in the RIN. An erbium-doped fiber amplifier (EDFA) is inserted in the passive resonator to construct an active fiber ring resonator (active FRR). For a great ARW improvement, the fiber ring resonator should have not only a great RIN reduction but also a large power transmission. A passive fiber ring resonator (passive FRR) reduces the RIN and improves the ARW, but the low power transmission results in a low signal-to-noise ratio at the detection. High precision fiber-optic gyroscopes (FOGs) interrogated with broadband light have angular random walk (ARW) limited by the source relative intensity noise (RIN).
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