13 results about "Gyrocompass" patented technology

A method for making gyroscopic azimuth measurements includes estimating a pitch angle and a roll angle of a gyroscopic surveying tool in a wellbore; determining a measurement duration for each of a plurality of gyroscope measurements from the estimated pitch and roll angles; making each of the plurality of gyroscope measurements at the determined measurement duration when the gyroscope is disposed at a corresponding plurality of rotational positions in the tool housing; and computing an azimuth of the wellbore from the plurality of gyroscope measurements.

The present invention relates to the field of MEMS (Micro Electro Mechanical Systems) and, in particular, to the use of MEMS gyroscopes in a gyrocompass for finding a geographical heading. By including at least three MEM gyroscopes with offset sensing axes arranged in a known orientation, the gyrocompass of the present invention does not require precise mechanical rotation of the gyroscopes to determine the heading of the gyrocompass or to compensate for bias errors.

The invention relates to a method for determining an azimuth angle (α) between a sensitive axis (z) of a quantum-based NMR gyroscope (100) and a geographic north direction (N), the method comprising aligning the sensitive axis (z) of the quantum-based NMR gyroscope (100) in a first measurement direction, which in particular runs substantially parallel to an Earth's surface, and determining a first Earth rotation (ω). R ), aligning the sensitive axis (z) of the quantum-based NMR gyroscope (100) in at least one second measurement direction, which in particular is essentially parallel to the Earth's surface and which differs from the first measurement direction, and determining at least one second Earth rotation, and determining the azimuth angle (α) from the first Earth rotation (ω) R ) and at least one second Earth rotation. The invention further relates to a gyrocompass (10).

A method for performing gyroscopic azimuth angle measurements includes estimating a pitch angle and a roll angle of a gyroscopic inclinometer in a wellbore; determining a measurement duration for each of the plurality of gyroscope measurements from the estimated pitch and roll angles; making each of the plurality of gyroscopic measurements at the determined measurement duration when the gyroscopes are disposed at a corresponding plurality of rotational positions in the tool housing; and calculating an azimuth angle of the wellbore from the plurality of gyroscopic measurements.

The utility model discloses a flexible gyrocompass north seeker which comprises a mounting seat, a case is mounted at the top of the mounting seat, a flexible gyrocompass assembly is mounted at the bottom of the inner wall of the case, a vibration reduction connecting assembly is arranged below the mounting seat, and the vibration reduction connecting assembly is connected with the mounting seat through a limiting and fixing assembly. According to the utility model, the double vibration damping design is realized through the vibration damper and the buffer spring, the mechanical lag error of the flexible gyroscope assembly is reduced through the composite vibration damping structure, the static north-seeking precision is less than or equal to 0.1 degree and the dynamic north-seeking error is less than or equal to 0.3 degree by matching with the real-time inclination angle compensation of the biaxial accelerometer, and the noise amplitude of vibration transmitted to the signal conditioning circuit is reduced. The accuracy of resolving the north angle by the STM32H7 processing chip is ensured, the limiting and fixing assembly and the vibration reduction connecting assembly can be detached from the mounting seat, so that the mounting seat can be recycled, and the flexibility in use is improved.

This invention belongs to the field of intelligent collision avoidance and early warning technology for ships, specifically relating to a method and system for collision avoidance and early warning in open sea areas. The method includes the following steps in sequence: multi-source navigation data acquisition and analysis, intelligent filtering of open water conditions, real-time calculation of collision risk parameters, collision risk early warning triggering, automatic recording of close-range navigation events, and ship-shore synchronization of early warning and recorded information. The main hardware used in the system includes an AIS signal controller, marine ARPA radar, GPS equipment, gyrocompass, serial port server, switch, collision avoidance tablet computer, captain's cabin computer, ship-side communication host, and shore-side platform. This invention aims to solve the problems of "alarm fatigue" and safety risks caused by numerous invalid alarms and poor scene adaptability in traditional collision avoidance early warning systems during navigation in open sea areas by integrating intelligent scene filtering, accurate risk calculation, and ship-shore collaborative management into a system and method, thereby achieving efficient and reliable automatic collision early warning.

This invention discloses a ship path planning method and system based on BeiDou grid codes, belonging to the field of path planning technology. The method includes acquiring planning data of the area to be planned for the ship, classifying the ship into priority levels, combining prior paths, priority levels, and planning indicators, generating a BeiDou grid code-based grid map through a real-world BeiDou grid code management module for global path planning, conducting collision risk analysis based on real-time sensing data from navigation and positioning systems, AIS, gyrocompass, logs, waves, and weather forecasts, evaluating the path planning effect based on the post-planning task completion efficiency, and adaptively adjusting the grid code level based on different indicators such as planning effect or energy efficiency. This method analyzes and mines real-time sensing data such as port information, ship route information, historical path planning data, and meteorological information to recommend routes, improve the safety, economy, and reliability of routes, and enhance the ship's intelligence level and operational efficiency.

A MEMS gyrocompass and method are provided to mitigate systematic error in determination of a north angle. The MEMS gyrocompass includes one or more MEMS gyroscopes having a sense axis within a reference plane. Samples from an output of the MEMS gyroscope are obtained in at least two angles of rotation about an axis perpendicular to the reference plane. First fit coefficients are determined by fitting samples with first fitting functions determined as function of time. Second fit coefficients are determined by fitting components of earth rotation rate projected on the reference plane based on samples obtained by all the MEMS gyroscopes, which fitting is performed with a second fitting function determined as a function of rotation angle of the MEMS gyroscope with respect to a reference angle. The north angle is determined as an angle between the reference angle and true north based on the second fit coefficients.

To provide a nuclear magnetic resonance gyroscope by means of which a north-south direction can be determined, a nuclear magnetic resonance gyroscope (100) comprising a vapor cell (10) containing atoms with nuclei having a non-zero magnetic moment, a first pump laser (11), a second pump laser (12) and a probe laser (13) is proposed, wherein the first pump laser (11) is aligned along a first axis (14), wherein the second pump laser (12) is aligned along a second axis (15), and wherein the probe laser (13) is aligned along a third axis (16).

To provide a technique capable of inexpensively shortening a settling time until becoming an operable state as a gyrocompass.SOLUTION: A gyro case having a gyro rotor built therein, a tank accommodating the gyro case therein, and degrees of freedom of three axes including a first axis oriented in a spin axis direction of the gyro rotor, a second axis orthogonal to the first axis and parallel to a horizontal plane, and a third axis orthogonal to the first axis and the second axis, and a horizontal tracking system that causes the tank to track around the second axis so as to maintain a relative posture of the tank with respect to the gyro case based on a displacement amount that is a displacement of the posture of the gyro case around the second axis detected by the detection unit, the horizontal tracking system including a horizontal movement amount calculation unit that controls a movement detection amount that is a movement amount of the tank detected by the detection unit to a movement target amount.SELECTED DRAWING: Figure 11

To realize a gyrocompass using a nuclear magnetic resonance gyroscope, a method (100) for using a nuclear magnetic resonance gyroscope (10) as a gyrocompass (200) is proposed, wherein the nuclear magnetic resonance gyroscope (10) comprises at least one measuring unit (11) wherein at least one first rotation rate ω R,1 and a second rotation rate ω R,2 are determined using the nuclear magnetic resonance gyroscope (10), where the first rotation rate ω R,1 is determined along a first direction (27) parallel to the Earth's surface (24), and where the second rotation rate ω R,2 along a second direction (28) parallel to the Earth's surface (24), further provided that the first direction (27) is different from the second direction (28), and that at least the first rotation rate ω R,1 and the second rotation rate ω R,2 a north-south direction (26) is determined

A system comprises a gyrocompass unit onboard a vehicle, with the gyrocompass unit comprising an inertial measurement unit (IMU) operative to produce inertial data for the vehicle. At least one processor is in operative communication with the IMU, the at least one processor hosting a set of program modules comprising: a gyrocompassing computation module operative to process the inertial data from the IMU and determine an attitude, heading, or latitude of the vehicle; and an artificial intelligence module including a trained gyrocompassing machine learning model, which is operative to process the inertial data from the IMU and predict an attitude, heading, or latitude of the vehicle. The gyrocompassing computation module is configured to receive the predicted attitude, heading, or latitude from the machine learning model, which operates as an aiding source during initialization or start-up of the gyrocompass unit to reduce an initial alignment time of the gyrocompass unit.

The utility model discloses a gyro difference measuring device, which is characterized in that an optical azimuth instrument is placed on a gimbal mechanism, and a rotating shaft of the optical azimuth instrument is connected with a rotating shaft of a rotary encoder, so that when the optical azimuth instrument is rotated to enable a collimation line of the optical azimuth instrument to be aligned with the center of the sun, the rotary encoder can be used for detecting the ship side angle of the sun relative to a ship; and then the computer processing unit can quickly calculate the gyro difference according to the broadside angle obtained from the rotary encoder, the azimuth of the sun gyro obtained from the gyrocompass and the navigation data obtained from the satellite navigation equipment, so that the calculation precision of the gyro difference is effectively improved.