33 results about "Terrestrial Time" patented technology

A vehicle capable of both aerial and terrestrial locomotion. The terrestrial and aerial vehicle includes a flying device and a rolling cage connected to the flying device by at least one revolute joint. The rolling cage at least partially surrounds the flying device and is free-rolling and not separately powered.

A system, method, and / or apparatus for remote measurement of terrestrial biomass contained in vegetative elements, such as large tree boles or trunks present in an area of interest, are provided. The method includes providing an airborne VHF radar system in combination with a LiDAR system, overflying the area of interest while directing energy toward the area of interest, using the VHF radar system to collect backscatter data from the trees as a function of incidence angle and frequency, and determining a magnitude of the biomass from the backscatter data and data from the laser radar system for each radar resolution cell. A biomass map is generated showing the magnitude of the biomass of the vegetative elements as a function of location on the map by using each resolution cell as a unique location thereon. In certain preferred embodiments, a single frequency is used with a linear array antenna.

A hybrid cellular radiocommunication system includes base stations defining terrestrial cells covered by satellite umbrella cells. The base stations are distributed so as to be distinguishable by the satellite cell according to a time-invariant distribution function, and the system includes a device for maintaining, permanently and in the same link direction, congruence of the coverage of each satellite cell with respect to coverage of the terrestrial cells associated with the base stations contained in the satellite cell, with coverage of a satellite cell being congruent with a predetermined terrestrial coverage set when the predetermined coverage set is included in the satellite coverage.

A payload for a repeater satellite of a communication system. The repeater satellite being placed into drift orbit above the surface of a celestial body. The payload being configured to repeat data received from a stationary satellite above the surface of the celestial body towards a terminal substantially at the surface of the celestial body, and to repeat data received from the terminal towards the stationary satellite. The payload is further configured to use a single frequency band for repeating data towards the stationary satellite, referred to as uplink transmission, and for repeating data towards the terminal, referred to as downlink transmission, as well as to time-division multiplex the uplink transmissions and the downlink transmissions. Also, a telecommunication system includes a repeater satellite provided with aforesaid payload, and a satellite communication method for transferring data between the terminal and the stationary satellite.

The invention discloses a terrestrial magnetism diurnal variation correction method based on terrestrial magnetism matching. Aiming at a terrestrial magnetism diurnal variation effect in terrestrial magnetism matched navigation and positioning, the invention provides a method for correcting the terrestrial magnetism diurnal variation effect based on an FMI (Finish Meteorological Institute) method and multi-dimensional characteristic quantity matching. The method comprises the following steps of: (1) selecting terrestrial magnetism matching characteristic quantities; (2) extracting a diurnal variation of each terrestrial magnetism matching characteristic quantity from actually-measured data of the terrestrial magnetism matching characteristic quantities based on the FMI method; (3) subtracting the corresponding diurnal variations by the actually-measured data of the terrestrial magnetism matching characteristic quantities and establishing a terrestrial magnetism real-time pattern; (4) matching the terrestrial magnetism real-time pattern with a terrestrial magnetism standard pattern based on the multi-dimensional characteristic quantity matching; and (5) outputting a matching result. According to the terrestrial magnetism diurnal variation correction method based on the terrestrial magnetism matching, the terrestrial magnetism diurnal variation effect in the terrestrial magnetism matched navigation and positioning can be effectively eliminated and the terrestrial magnetism matched navigation and positioning precision can be obviously improved.

The invention discloses a terrestrial magnetism horizontal component dynamic supervising device, comprising a coil, a suspension device, a torsion amplification device, and a monitoring device. The coil is suspended in the air through the suspension device and is twisted after electrification under the action of terrestrial magnetism; the torsion amplification device performs displaying and amplification on the torsion angle of the coil; the monitoring device twists the display result of the amplification device and obtains the dynamic terrestrial magnetism horizontal component after processing. The terrestrial magnetism horizontal component dynamic supervising device utilizes mechanics,optics and the technology of processing the picture by a computer, can reflect the amplitude of the terrestrial magnetism horizontal component all the time, and successfully performs dynamic monitoring on the amplitude of the terrestrial magnetism horizontal component.

The invention provides a method for eliminating terrestrial clutters of an airborne weather radar based on terrain altitude data. The method provided by the invention comprises the following steps of: reading airplane position and radar parameters, establishing a local rectangular coordinate system, calculating longitudes and latitudes of ground sampling points in a beam direction, reading DEM (Digital Elevation Model) data, calculating a lower view angle sequence of the sampling points relative to an airplane, analyzing a tendency of the lower view angle sequence, judging a monotonically decreasing sequence, eliminating a non-monotonically-decreasing lower view angle value, determining a beam grounding range, editing echo signals and replacing by a background, updating the airplane position and an antenna azimuth angle, judging whether the scanning is finished, displaying complete scanning echo signals by a radar display screen and the like. According to the method provided by the invention, by utilizing the characteristics that the terrestrial clutters of the airborne weather radar echoes and weather targets are respectively located at units with different distances and can be separated in the distance and adopting the discipline characteristics of the lower view angle, the grounding position of the radar beam is analyzed, and the terrestrial clutters is eliminated by utilizing and utilizes the terrain altitude data; and the method has the advantages of simple method, calculation accuracy, good inhibition effect, capability of effectively eliminating terrestrial cluttersof the airborne weather radar in a time domain and the like.

A mobile map display device has a terrestrial magnetism sensor for measuring terrestrial magnetism, a display section, and a control section capable of calculating a geographical bearing based on the value measured by the terrestrial magnetism sensor and having first display processing and second processing where, when the control section obtains a map and makes it displayed on the display section, the first display processing causes the map to be displayed in a direction associated with the calculated bearing and the second display processing causes the map to be displayed in a manner fixed in a predetermined bearing. In displaying the map, upon detecting deterioration in the accuracy of the terrestrial magnetism sensor, the control section causes the map to be displayed by the second display processing.