6 results about "Directivity" patented technology

An information presentation device includes: a directional information obtaining element for obtaining directional information based on a signal from an enhancement device for safety or comfort of a passenger of a vehicle; an information presentation controller for generating a driving signal based on the directional information; and a stimulation element including multiple vibrators for generating a traveling wave of vibration in an in-vehicle element. A directionality of the traveling wave corresponds to the directional information. The stimulation element transmits the traveling wave to the passenger so that the passenger perceives the directionality of the traveling wave.

The invention discloses an air-seat interface observation key technology-data real-time water surface relay communication float. The air-seat interface observation key technology-data real-time watersurface relay communication float comprises a floating ball, a cylindrical sealed cabin and a carrying platform; a cylindrical body which runs through the floating ball is arranged on the cylindricalsealed cabin; the cylindrical body extends along the vertical diameter of the floating ball; the lower end part of the cylindrical sealed cabin extends out of the floating ball; the carrying platformis fixed at the lower end part of the cylindrical sealed cabin in a sleeving manner; at least one pair of float acoustic transducers is mounted on the carrying platform; a battery pack and a working module are mounted in the cylindrical sealed cabin in sequence from bottom to top; and a cable passing passage coaxial with the cylindrical sealed cabin is arranged in the battery pack. The air-seat interface observation key technology-data real-time water surface relay communication float has the advantages that the vertical stability is high, the vertical directivity of acoustic communication andsatellite communication can be guaranteed so that measuring data are more effectively passed back to a shore station monitoring center in real time.

A three-dimensional image display apparatus is provided. The three-dimensional image display apparatus includes an element image array, a backlight source, and a fly-eye lens array. The element image array is disposed between the backlight source and the fly-eye lens array. Incident angles of lights emitted from different directional light sources with respect to the element image array are different. The image resolution of the three-dimensional image display apparatus is raised by using the backlight source having the multiple directional light sources.

The invention discloses a method for measuring loss of a large-scale double-reflector antenna. The method comprises the following steps: firstly, measuring the power gain of the large-scale double-reflector antenna by using a radio power source method; then measuring antenna orientation and pitching power directional diagrams in a limited angular domain by using a beacon of a geosynchronous orbit stationary satellite, and calculating directional gain of the antenna by using a numerical integration method; and finally, calculating the loss of the large-scale double-reflector antenna according to the measured antenna power gain and directional gain and considering antenna irradiation loss correction, support shielding correction, axial cross polarization loss correction and mismatch correction. The method is simple and feasible, and has popularization and application values.