15 results about "Altimeter" patented technology

This invention relates to the field of aviation navigation and simulation technology, specifically disclosing an airborne scene-terrain matching assisted navigation method and a highly realistic simulation platform. The method involves acquiring measured terrain information via an airborne camera, and collecting SAR image information, altimeter and atmospheric sensor information via radar. A matching algorithm between the camera terrain and radar images is used to match the measured data with pre-stored information, outputting the position correction error for inertial navigation to achieve inertial navigation correction. Even in complex electromagnetic environments without satellites or in electromagnetic silence, combined inertial navigation and matching navigation can still be achieved, ensuring stable flight of the aircraft. Simultaneously, a highly realistic 3D visual simulation platform is constructed, including a digital aircraft, flight control law, inertial navigation, 3D terrain, and various airborne equipment, providing full-process simulation support for the design, implementation, and testing of airborne scene-terrain matching assisted navigation systems. This invention solves the problem of aircraft navigation relying on satellites in complex electromagnetic environments, improves the anti-interference and reliability of navigation, and the simulation platform can effectively reduce the R&D and testing costs of navigation systems and improve R&D efficiency.

This invention discloses a space-ground coordinated radiometric characteristic calibration method for spaceborne active microwave sensors in the field of radar Earth observation technology. It constructs a space-ground coordinated calibration system consisting of a radiation reference source satellite and a ground calibration processing station. The method includes: determining the orbital parameters of the radiation reference source satellite; the satellite transmitting signals to the ground station in Earth observation mode, using a known RCS target on the ground to calibrate its own antenna gain and link gain; receiving signals from the satellite to be calibrated in Earth observation mode, accurately calculating and transmitting echo signals based on the calibrated parameters; and the satellite to be calibrated calibrating its own transmit / receive link gain based on the received echo signals. This invention can be widely applied to the on-orbit radiometric calibration of active microwave sensors such as synthetic aperture radar, altimeters, and microwave scatterometers, significantly improving calibration frequency and accuracy, supporting multi-band, high-stability quantitative remote sensing tasks, and providing reliable technical support for precise observation in fields such as ocean monitoring, weather forecasting, and topographic mapping.

This invention discloses an automatic frequency-elevation map measurement method and system based on residual networks, enabling rapid and automatic extraction of key ionospheric parameters from frequency-elevation maps acquired by digital altimeters. The method first parses the header information and echo intensity data from the original binary file of the altimeter to generate a frequency-elevation map image. Then, a small number of samples are manually labeled to establish a training set with critical frequencies such as foF2 and h'F2 as ground truth. Based on this, an end-to-end model including a backbone residual network, pooling layers, and a feature extraction head is built. This model is trained to convergence through backpropagation and further fine-tuned using expanded sample data to obtain an engineering-deployable model. Finally, the frequency-elevation map to be processed is input into the model, and the predicted values ​​of the target parameters are output and written to the results file. This method reduces the workload of manual interpretation and verification and improves the measurement accuracy of irregular and disturbed frequency-elevation maps.

This invention provides a viewing area survey system that facilitates the measurement of received electric field strength to determine the viewing area for a given radio wave. [Solution] The viewing area survey system 1 comprises a measuring device 3 mounted on a drone and having a GNSS device 31 for detecting its position information, an altimeter 32 for measuring the drone's altitude, and a receiving field strength measuring unit 33 for measuring the received field strength of broadcast waves, and a management server having a viewing area determination unit 46 for determining the viewing area of ​​broadcast wave A. The GNSS device, altimeter, and receiving field strength measuring unit are connected to the viewing area determination unit so as to be able to communicate with each other. The drone flies based on a predicted viewing area where the received field strength of the broadcast wave is predicted to be equal to or greater than the minimum received field strength required to view the broadcast wave. The receiving field strength measuring unit acquires the point where the received field strength of the broadcast wave becomes the minimum received field strength, and the viewing area determination unit determines the area inside the area formed by connecting the acquired points as the viewing area.

The application provides an inertial platform fault injection and testing method based on redundancy technology, aiming at an inertial platform accelerometer height measurement and altimeter combined error feedback compensation height measurement system adopting redundancy technology, four faults of platform noise interference fault, platform large interference torque fault signal, altimeter noise fault and altitude redundancy error feedback fault, adopting a time injection function mode, combining an inertial platform mechanical motion model, a direct current torque motor model and a gyroscope measurement model established by a transfer function method, organically combining the above faults and signals into a closed loop closed system, effectively simulating the altitude measurement output signal of the redundancy technology based on the fault state, thereby realizing the fault injection simulation of the inertial platform system and realizing the equivalent function of the testing system.

This invention discloses a high-isolation radio altimeter microstrip antenna, mainly addressing the problem of low isolation in existing antennas. From top to bottom, it includes a radiator (1), an adjustment structure (2), and a ground plane (3). The adjustment structure (2) includes a frame (21), metal stubs (22), shorting pins (23), and a dielectric (24). The metal stubs consist of three parts, with the first part located at the antenna's central axis AA, and the second and third parts symmetrical about the antenna's central axis AA. The shorting pins consist of three groups, with the first group located at the antenna's central axis AA, and the second and third groups symmetrical about the central axis AA. The frame and metal stubs are located on the upper surface of the dielectric, while the shorting pins are located inside the dielectric. This invention uses a split design to form a transmitting antenna and a receiving antenna, which can be flexibly installed in different positions on the device, effectively improving the isolation between the transmitting and receiving antennas. It can be used in radio altimeters or ranging / altitude radars.

A deep-sea lander suitable for rapid stable deployment and a deployment recovery method, comprising a bottom configuration, both ends of which are provided with side plates, the side plates comprising folding side plates and opening and closing side plates, the opening and closing side plates being connected with the bottom configuration through a rotating shaft, the top surfaces of the two folding side plates being connected and fixed through connecting hinges and wing plate fixing mechanisms, both side surfaces of the bottom configuration being respectively provided with side configurations, the upper part of the side configuration being a folding triangular plate; a channel is arranged at the lower part of the outer part of both ends of the bottom configuration, and a propeller is arranged; the opening and closing mechanism for controlling the opening and closing of the opening and closing side plates is further included, a carrying frame is arranged in the bottom configuration, a battery is arranged at the bottom of the carrying frame through an explosive bolt, buoyancy adjusting cabins are arranged at both sides of the carrying frame, a buoyancy adjusting pump, a multi-beam sonar and an altimeter are arranged at one side of the carrying frame, a control tank is arranged at the other side of the carrying frame, and a buoyancy material is arranged at the top surface of the carrying frame, the whole has good working stability and a high safety factor.

The utility model relates to underwater robot technical field especially relates to a deep sea diving load micro -observation type submersible, include: casing, the both ends of casing are provided with front -viewing camera and rear -viewing camera respectively, and casing is rotatively connected with front -viewing camera, and the advance and retreat propeller and the submersible float propeller, the advance and retreat propeller and the submersible float propeller all are arranged in the casing, and the advance and retreat propeller drive casing moves in the first direction, and the submersible float propeller drive casing moves in the second direction, and the adapter box and the altimeter, the adapter box and the altimeter all are arranged in the casing, and the adapter box is installed with lithium cell and control panel, the utility model discloses an electronic device and battery are integrated in the adapter box to reduce the occupation of each component to space, and then have space to carry high -definition camera, can be conveniently carried to the manned submersible or heavy -duty operation type submersible, solved the problem that the micro -submersible adopts analog camera in the prior art and the imaging quality is poor.

The present invention discloses an unmanned surface vessel (USV) passive electromagnetic detection system and positioning method for submarine cables. The cable detection sensor configuration mainly includes an electromagnetic detection system, a bottom-penetrating altimeter, and a navigation system. The USV detection platform is designed to detect and locate cable route points using a reciprocating navigation method. The navigation route consists of a straight detection path and a transition path between the straight paths. The detection system collects environmental electromagnetic signals along the straight detection line and calculates the location of the cable route points based on the collected signals. Based on the located cable route points, key waypoints on the next detection line are planned, thereby completing the reciprocating navigation of the USV detection platform and the unmanned positioning of cable route points. Compared with methods currently used in engineering practice, the cable detection and positioning method designed in this invention has advantages such as low cost, high efficiency, high accuracy, and no human resource consumption.

This invention discloses a dual-antenna GNSS-IR water level monitoring method, apparatus, device, and storage medium, relating to the field of water level measurement technology. The method involves placing a first antenna below a second antenna and using a dual-antenna receiver to receive the signal-to-noise ratio (SNR) sequences of both the first and second antennas. Based on the antenna spacing, the antenna interference phase difference is calculated. Based on the antenna interference phase difference, the interference phase of the target antenna is calculated. Based on the oscillation frequency and wavelength of the SNR sequences, the interference phase, the GNSS satellite elevation angle, and the absolute antenna altitude, the absolute altitude of the target water surface is calculated. Compared to existing technologies, this invention solves the problem of low sampling rate in traditional single-antenna GNSS-IR altimeter measurement. Furthermore, compared to dual-antenna GNSS-IR, this invention offers more stable signal tracking and lower hardware costs.

The present application relates to the field of hydrological remote sensing and geographic information technology, and more particularly to a water body and water level cooperative extraction method and system. The method comprises the following steps: collecting multi-source remote sensing data of a target area within a preset time period; extracting water body information of optical image data in the multi-source remote sensing data to generate a water surface mask, and quantitatively extracting water body morphological characteristic parameters based on the water surface mask; extracting observation data within the spatio-temporal range of the water surface mask in the spaceborne radar altimeter planar water level data that meets the water body morphological characteristic parameters to construct an initial planar water level field; performing spatio-temporal matching and spatial correction on the spaceborne laser radar point elevation data in the multi-source remote sensing data and the initial planar water level field; and performing spatio-temporal fusion according to the spatially corrected planar water level field and the spatio-temporal change information of the water surface mask. The present application can break through the limitations of a single data source in terms of spatio-temporal resolution and continuous monitoring capability, while improving the water level inversion accuracy and reliability.

This application relates to the field of autonomous underwater vehicle (AUV) navigation control technology, and discloses a stable navigation control method, system, device, and medium for an AUV. Through a hardware system comprised of a depth gauge, altimeter, Doppler velocimeter, single-beam forward-looking sonar, attitude measurement instrument, and central controller mounted on the AUV, the system achieves stable navigation control of the AUV while maintaining it within an optimal altitude range through the coordinated work of modules such as information perception, parameter calculation, slope estimation, altitude prediction, and attitude control. By employing adaptive sampling frequency adjustment, dynamic sliding window slope estimation, and attitude control based on terrain slope compensation, the system solves problems such as weak maneuverability of underactuated AUVs in complex undulating terrain, difficulty in terrain tracking due to high sensor measurement noise, and unstable bottom height. Furthermore, it features low hardware cost, high control accuracy, and strong robustness, and can be widely applied to various underwater surveying operations.

The present application relates to the technical fields of guided shell navigation positioning, and discloses a combined navigation positioning error intelligent compensation system for guided shells; comprising a multi-source sensing module, a launch setting and prior information module, a combined navigation fusion unit, a satellite availability discrimination module, an inertial navigation inversion and error decoupling module, and an error deep compensation network; when satellites are available, the equivalent error in the measurement domain is taken as a label by fusing satellite navigation and inversion with Kalman filtering, and a deep network is trained incrementally online; when satellites are denied, the network predicts the error to feed forward compensate the inertial navigation, and the fusion positioning is carried out in combination with geomagnetic matching and barometric altimeter; by injecting the ballistic prior constraint into the network in a conditional normalization manner and adopting an elastic weight consolidation mechanism to prevent catastrophic forgetting, the system can overcome the parameter mutation caused by launch impact and the full trajectory time-varying drift, and realize high-precision navigation positioning under the condition of long-time satellite denial.

This utility model discloses a radio altimeter tester, belonging to the technical field of altitude testing equipment. It includes a tester base mounted on top of the aircraft mounting section, with a protective shell installed on the top of the base. The utility model utilizes a movable mechanism within an L-shaped cavity. After the instrument is mounted on the aircraft mounting section using a screw, sufficient air can be injected into the L-shaped cavity through an air inlet. This causes the first piston plate and the screw to compress against each other. During subsequent use, if the screw becomes excessively loose or even detaches due to aging or aircraft vibration, the first piston plate will move further upwards. At this point, the exhaust port connects to the bottom of the L-shaped cavity, and compressed air inside the cavity is continuously ejected through a tubular whistle, which emits a sharp warning sound to promptly alert the pilot to take appropriate remedial measures.