Abstract:
A system and method for determining position of, for example, a robot based on reflected signals comprises a transmitter for transmitting signals in a number of directions within a range of directions and a receiver for receiving echoes of the signals from any direction in the range. The transmitter has a first rotatable antenna and the receiver has a second rotatable antenna which is mechanically couplable to the second antenna. The received echoes are processed by a processor to derive echo data signals indicative of the distance of the system to one or more reflective surfaces and the direction of the reflective surface(s) relative to the system. The processor is arranged to determine the position of the system relative to a starting position from the derived echo data signals indicative of the distance of the system to the reflective surface(s) and the direction of the reflective surface(s) relative to the system.
Abstract:
A local positioning system is proposed for wirelessly locating an object using existing features within a static environment, such as walls, as the references for determining the position of the system. An antenna 16 attached to the object transmits RF signals which are reflected by the surroundings. During a training mode, the reflected signals are used to train a neural network 22, 43 to map the position of the object to the characteristics of the reflected signals. During a working mode, the trained neural network is to identify the position of the object based on reflected signals in working mode. Optionally, the reflected signals may be subject to a clustering process before input to the neural network.
Abstract:
A method, device and system for determining a DOA of a signal are described. Determination of the DOA of the signal may include receiving first and second UWB waveforms of the signal at one or more antennas of a UWB transceiver. A window may be defined in the first and second UWB waveforms such that the window is defined in a leading portion of the signal. First and second amplitude values of the respective first and second UWB waveforms in the window may be calculated. An amplitude ratio may be calculated with the first and second amplitude values and compared with calibration data to determine the DOA of the signal.
Abstract:
A dispersion compensation fiber comprises a fiber core and cladding. The fiber core is a core layer mainly doped with germanium and having a positive relative refractive index difference. The cladding covering the fiber core comprises a trench cladding mainly doped with fluorine, an annular cladding mainly doped with germanium, a matching cladding mainly doped with fluorine, and an outermost mechanical cladding in order. Relative refractive index differences of the fiber core and the claddings are respectively: Δ1% being 1.55% to 2.20%, Δ2% being −0.55% to −0.30%, Δ3% being 0.40% to 0.65%, Δ4% being −0.20% to −0.01%, and Δ5% being 0. Radius ranges, from R1 to R5, of the fiber core and the claddings are respectively: R1 being 1.4 to 1.7 μm, R2 being 4.1 to 4.8 μm, R3 being 6.7 to 8.8 μm, R4 being 10 to 17 μm, and R5 being 38 to 63 μm.
Abstract:
A universal multipurpose sensor fixing device comprises a radial positioning mechanism, supporting mechanisms, bases, acoustic emission test sensor mounting mechanisms, and parallelism adjusting members. Each supporting mechanism includes a main arm and an auxiliary arm having one end connected to the main arm and a ball head on the other end. A parallelism adjusting member mounting mechanism is provided at the joint of the main arm and the auxiliary arm. The main arms are respectively connected to the two free ends of the radial positioning mechanism to position the auxiliary arms at the inner sides of the main arms, arranged axis symmetrically with respect to the central line of the radial positioning mechanism. The ball heads of the two auxiliary arms are located within spherical holes of the bases to form universal revolute pairs. A set of acoustic emission test sensor mounting mechanisms are mounted at each base.
Abstract:
An implantable electrode array includes an elongated carrier (20) and a plurality of electrodes mounted within the carrier. A actuator adjusts the curvature of the carrier and can be controlled by varying an electric potential applied to the actuator. The actuator is based on an electrochemical cells and may be a conducting polymer based actuator.
Abstract:
The present disclosure provides a transmission power control method for a physical uplink shared channel, including: when there is only uplink control information but no uplink shared channel data sent over the physical uplink shared channel, the transmission power of the physical uplink shared channel is set according to the total number of bits contained in a channel quality indication signaling and its corresponding cyclic redundancy check as well as an amplitude offset. The present disclosure also provides a transmission power control system for a physical uplink shared channel. The method and system described in the present disclosure can ensure the overall performance of a system.
Abstract:
An unequal helix-angle end mill includes a cutting part and a handle part. The cutting part is provided with a plurality of flutes, each spirally extending from the bottom end to the handle part. The face of each flute facing the cutting rotation direction is a rake face, wherein the rake face and an outer peripheral face of the cutting part are intersected to form an outer peripheral blade, and the helix-angle of at least one of the peripheral blades is different from those of the other peripheral blades. A face joined with the peripheral blade among the outer peripheral face of the cutting part is a rear face. The width B of the edge flap of each peripheral blade is equal on a plane orthogonal to a rotating axis of the end mill. The unequal helix-angle end mill has high strength, and enhances the cutting depth and durability.
Abstract:
A multipurpose sensor fixing device includes a radial positioning mechanism, a supporting mechanism, a base, a mounting mechanism, and a parallelism adjusting member. The supporting mechanism comprises a main supporting arm and an auxiliary supporting arm, with one end of the auxiliary supporting arm connected to the main supporting arm and the other end comprising kink shaft members. The main supporting arm is connected to an end of the radial positioning mechanism to locate the auxiliary supporting arm at the inner side of the main supporting arm. The kink shaft member of the auxiliary supporting arm is inserted into a plughole of the base to form a revolute pair with the auxiliary supporting arm. The mounting mechanism is mounted at the base. The parallelism adjusting member is mounted on the main supporting arm.