9 results about "Gravimeter" patented technology

A gradio-gravimeter comprising at least two vehicles (V1, V2), each with an inertial measurement unit (IMU1, IMU2) and a control unit (COM1, COM2) for guiding the vehicles along trajectories with separate segments for performing IMU flips and coupled segments for exchanging inertial measurements. At least one of the electronic control units is configured to determine, notably from the exchanged measurements: a transition matrix between inertial frames, a correction of linear acceleration measurements using an observed accelerometric model, a correction of angular velocity measurements using an observed gyrometric model, and a gravitational field gradient. Navigation system comprising such a gradio-gravimeter. FIGURE IN ABRIDGED DIAGRAM: Fig. 1

This invention relates to the field of gravity measurement, aiming to provide a small-sized, high-precision gravimeter based on the principle of antimagnetic levitation. The gravimeter includes a low-frequency magnetic potential trap unit, a levitation oscillator unit, a displacement detection unit, and a cavity enclosure unit. The lens groups of the low-frequency magnetic potential trap unit, the levitation oscillator unit, and the displacement detection unit are all located in the cavity of the innermost insulated shell. This invention provides a measurement environment free from external influences for displacement detection of the levitation oscillator, counteracts adjustments to the vertical frequency in the antimagnetic levitation potential trap, and uses a photoelectric converter to measure voltage fluctuations caused by changes in laser intensity to reflect the motion of the object under test, achieving high-precision gravity measurement. The oscillator uses magnetic levitation and does not have mechanical contact with the environment, avoiding long-term irreversible deformation. It eliminates the need for bulky temperature control and magnetic shielding devices or other auxiliary equipment; therefore, the overall size of the gravimeter is small, easy to move, and inexpensive, facilitating widespread adoption.

The application relates to a cold atom gravimeter frequency promotion method based on a long short-term memory network-exponential moving average algorithm, and relates to the fields of cold atom gravimeter measurement and the like. In order to solve the defects that the output frequency of a cold atom gravimeter is low and it is difficult to consider high precision and high frequency in the prior art, the technical scheme provided by the application comprises the following steps: acquiring original gravity acceleration data output by the cold atom gravimeter and obtaining denoised data; performing linear interpolation on the denoised data to generate a continuous input sequence for long short-term memory network training and prediction; outputting a next-time gravity acceleration prediction value according to the continuous input sequence; generating a frequency promotion sequence composed of measured data and predicted data according to the prediction value; and obtaining final high-frequency gravity acceleration output data. The application is suitable for work of obtaining high-precision and high-frequency gravity acceleration data in geological exploration, gravity matching navigation and geophysical monitoring.

The application provides a gravimeter probe, and relates to the field of quantum precision measurement.The gravimeter probe comprises a measurement cavity, a containing space in which a vacuum is formed, the containing space being configured to allow a target atomic group in a first energy level to freely fall along a gravity direction and to occur atomic interference in the process of free falling, atoms in the atomic group after the interference being in a quantum superposition state of the first energy level and a second energy level, the first energy level being lower than the second energy level; a light-transmitting part is formed on the measurement cavity and is in communication with the containing space to allow external measurement light to be incident on the containing space from the light-transmitting part; wherein a light beam of the measurement light is configured to cover a movement track of the atomic group after the interference from a first measurement moment to a second measurement moment, the measurement light irradiating the atomic group after the interference at the first measurement moment and the second measurement moment to obtain a transition probability of the target atomic group in the atomic interference, and the transition probability is used to determine a gravity acceleration at a position where the gravimeter probe is located.

The application provides a gravimeter probe, and relates to the field of quantum precision measurement.The gravimeter probe comprises: a measurement cavity, an accommodation space with a vacuum formed inside, the accommodation space being configured to allow a target atomic group in a first energy level to freely fall along a gravity direction and to occur atomic interference in the process of free falling, atoms in the atomic group after the interference being in a quantum superposition state of the first energy level and a second energy level, the first energy level being lower than the second energy level; a light transmission part is formed on the measurement cavity and is in communication with the accommodation space to allow external measurement light to be incident into the accommodation space from the light transmission part; wherein, a light beam of the measurement light is configured to cover a movement track of the atomic group after the interference from a first measurement moment to a second measurement moment, the measurement light irradiating the atomic group after the interference at the first measurement moment and the second measurement moment to obtain a transition probability of the target atomic group in the atomic interference, and the transition probability is used to determine a gravity acceleration at a position where the gravimeter probe is located.

This invention provides a method and system for verifying the accuracy of tidal force estimation. By calculating the tidal force at a given measuring station and the force exerted by the Earth on the station, the total change in gravitational acceleration at that station is calculated and matched with data collected by a gravimeter. Positioning is then performed using a gravitational positioning method. The accuracy of the tidal force calculation is evaluated based on the positioning accuracy, thus verifying the accuracy of the tidal force estimation. Due to error propagation, even small errors in the tidal force calculation will manifest as significant positioning errors in the positioning results. This invention, by verifying the tidal force through the positioning results, can greatly improve the verification accuracy.

This invention relates to a highly efficient underwater gravity field information measurement method based on swarm collaboration. It utilizes an unmanned swarm of underwater unmanned vehicles (UUVs) equipped with underwater gravimeters to simultaneously measure gravity information along multiple underwater survey lines. Using a surface vessel as a reference gravimeter, the underwater gravimeter is compared with the reference gravimeter before release and after retrieval to ensure consistency of underwater gravimeter measurement information. After release, the UUV navigates to the starting point of the survey line and, guided by a surface vessel, uses two-stage motion control to maintain the survey line's navigation and formation. Ultra-short baseline positioning and relative ranging are used to determine the UUV's precise position and velocity, enabling accurate compensation and correction of gravity measurements, acquisition of gravity anomaly information along the survey line, and construction of a gravity map. This invention achieves highly efficient underwater gravity measurement and rapid gravity map construction, improving measurement efficiency several times compared to traditional ship-based gravity measurement methods.

The application provides a gravity anomaly underwater continuation method and device based on an upright hexahedron section, a track gravity anomaly of a submarine is read by a boat-borne gravimeter; an upward continuation calculation surface elevation is obtained, the track gravity anomaly is upwardly continued to the calculation surface to obtain a continuation gravity anomaly; a seawater gravity anomaly is calculated by constructing an upright hexahedron model; an upward continuation gravity correction value is calculated according to the continuation gravity anomaly and the seawater gravity anomaly; a standard deviation of a difference value between a sea surface gravity anomaly and the upward continuation gravity correction value is calculated; if the standard deviation is less than or equal to a continuation threshold value, the upward continuation gravity correction value is determined as the continuation gravity value; real-time coordinates of the submarine are obtained according to the track gravity anomaly and the continuation gravity value. The track gravity anomaly and the sea surface gravity anomaly are matched on the same observation surface, the positioning accuracy of gravity matching navigation is enhanced, the continuation result is more accurate, and the matching speed is faster.

The application discloses an outdoor superconducting supporting structure for gravity measurement, and relates to the field of superconducting magnetic suspension control. The structure comprises an electrode ball cavity, a superconducting ball, an upper suspension coil and a lower suspension coil. The upper suspension coil and the lower suspension coil generate a suspension magnetic field. A main supporting force is applied to the superconducting ball. The electrode ball cavity comprises an upper electrode plate, a first electrode plate, a second electrode plate, a third electrode plate, a fourth electrode plate and a lower electrode plate. The upper electrode plate, the lower electrode plate and the superconducting ball form a vertical differential capacitive sensor for applying a vertical supporting force. The first electrode plate, the third electrode plate and the superconducting ball form a first lateral differential capacitive sensor, and the second electrode plate, the fourth electrode plate and the superconducting ball form a second lateral differential capacitive sensor for respectively applying a first lateral feedback electrostatic force and a second lateral feedback electrostatic force. The main supporting force, the vertical supporting force, the first lateral feedback electrostatic force and the second lateral feedback electrostatic force are used to suspend the superconducting ball at a central position of the electrode ball cavity. The application realizes stable supporting during dynamic measurement of a superconducting gravimeter.