Abstract: An antenna device, a positioning system and a positioning method are provided. The positioning method includes: dispersedly arranging a plurality of receivers to form a target area, in which each of the receivers includes the antenna device; receiving a wireless signal from the target area through the antenna device, and generating a difference signal strength and a sum signal strength; calculating, for each of the receivers, a sum-difference ratio between the difference signal strength and the sum signal strength, and estimating a corresponding one of estimated incident angles according to the sum-difference ratio and a comparison table; executing, in response to obtaining the estimated incident angles corresponding to the receivers, a positioning algorithm according to the estimated incident angles, so as to generate a plurality of possible positions; and executing an optimization algorithm to calculate a best estimated position of the possible positions.

Abstract: An ultra-wideband assisted precise positioning system and an ultra-wideband assisted precise positioning method are provided. The method includes: arranging a plurality of device nodes in a target area; configuring a central control device node to communicatively connect to the device nodes; configuring the device nodes to perform a positioning process to obtain measured distances and positioning positions to be corrected; and configuring a central control processor to execute a positioning algorithm. The positioning algorithm includes: obtaining the measured distances and the positioning positions to be corrected; for each of the positioning positions to be corrected, performing a center-of-gravity weighting processing on neighboring points for obtaining initial guess positions; and obtaining the initial guess positions to input to an optimizer and optimize an objective function, and finding corrected positions with relatively smallest errors.

Abstract: A positioning system and a positioning method based on WI-FI® fingerprints are provided.

Abstract: A positioning system and a method based on neural network models are provided. The positioning method includes collecting WI-FI® fingerprint data; configuring a computing device to receive the WI-FI® fingerprint data, and the computing device includes a processor and a database storing positioning map data and a group of neural network models including a global positioning model, a coarse positioning model and a fine positioning model; configuring the processor to input the WI-FI® fingerprint data and perform the following steps: estimating a global coordinate through the global positioning model; obtaining the corresponding coarse positioning model from a corresponding primary sub-region to estimate an estimated coarse coordinate of a current position; estimating a plurality of estimated fine coordinates of the current position from the corresponding fine positioning model; and performing a merging process on the estimated fine coordinates to generate a final coordinate.

Abstract: An ultra-wideband (UWB) localization method, a UWB localization device, and a UWB localization system are provided. The UWB method includes: determining whether or not a plurality of UWB hardware measurement deviations are calibrated; determining, when the UWB hardware measurement deviations are calibrated, whether or not a plurality of anchor coordinates of anchors are automatically measured; obtaining, when the anchor coordinates of the anchors are automatically measured, a plurality of measurement distances between each of the anchors and a tag, respectively, and deducting the UWB hardware measurement deviations from the measurement distances, respectively; and calculating a tag coordinate of the tag according to the measurement distances from which the UWB hardware measurement deviations are deducted.

Abstract: The invention discloses a large drone that is powered by solar energy. In addition, the drone includes a large, lightweight fuselage that not only keeps balance and stability but also reduces the required power during flight.

Abstract: A system for establishing positioning map data and a method for the same are provided.

Abstract: An ultra-wideband (UWB)-assisted precise positioning system, which includes a plurality of mobile base stations (MBSs) and a central control base station (CBS). The central CBS and the MBSs are configured to: measure, by the UWB communication module, distances between the MBSs, such that the moving module controls the MBSs to have a predetermined distance from one another and form a predetermined pattern; configure the global satellite positioning (GPS) modules to perform positioning to obtain a plurality of initial positions; execute a pattern search algorithm to generate a plurality of corrected positions; generate a plurality of predicted positions to be input to a cost function for finding a plurality of final predicted positions having relatively smallest errors; measure, by the UWB communication module, distances of a test object relative to the MBSs and calculate a position of the test object.

Abstract: A small unmanned aircraft is disclosed. By delicate design and limitation of the specification, the small unmanned aircraft is enabled to fly by solar energy produced from a solar cell module. Preferably the small unmanned aircraft has a dimension less than 60 cm×60 cm.

Abstract: An ultra-wideband assisted precise positioning method includes: arranging a plurality of base stations in a target area; configuring a mobile base station to move to a plurality of predetermined positions; configuring a GPS module to obtain GPS position information and GPS altitude information; configuring first ultra-wideband communication modules and a second ultra-wideband communication module to measure distance information; configuring a computing module to execute a first positioning algorithm to calculate a plurality of base station coordinates; arranging a third ultra-wideband communication module on an object to be measured; configuring the first ultra-wideband communication modules and the third ultra-wideband communication module to obtain detection distances; and configuring the computing module to execute a second positioning algorithm to calculate a positioning position of the object to be measured based on the detection distances and the plurality of base station coordinates.

Abstract: A real-time data transmission system includes an aerial device and a base station. The aerial device has a first antenna module transmitting data in a frequency band with wide-bandwidth and high-speed transmission characteristics. The base station includes a second antenna module configured to receive data from the first antenna module of the aerial device in the frequency band. The radiation direction of the second antenna is adjustable in accordance with the position of the aerial device.

Abstract: An envelope tracking frontend device and a switch thereof are provided. The envelope tracking frontend device includes a power amplifier coupled, a switch and an envelope tracking module including an envelope tracking bias supply coupled between the signal generator and the switch. The switch includes a transmit-receive port, a transmit port coupled to the power amplifier, a receive port, a first terminal and a second terminal in series connection, and a third transistor and a fourth transistor as shunt transistors. The envelope tracking bias supply is configured to provide an envelope forward bias signal to the gate of the second transistor and the gate of the fourth transistor, and provide an envelope reverse bias signal to the gate of the first transistor and the gate of the third transistor such that an amplified signal is modulated before being provided by the switch.