79results about How to "Improve ranging ability" patented technology

Enhanced reception of transmitted signals in a communication system is achieved by synchronously combining transmissions from a cluster of transmitters at a distant receiver. The transmitters coordinate transmissions such that each substantially simultaneously transmits the same signal on the same communication channel. As a consequence of the spatial diversity of the transmitters, the transmitted signals arrive at the receiver at different times. The receiver essentially treats the different transmitted signals as though they were different multipath signals from a single transmitter. A multipath equalizer or combiner is used to determine timing offsets among the received signals, and the received signals are time aligned by phase rotating the signals in accordance with the estimated timing offsets. The time-aligned signals are then coherently combined and detected. The combined signal has a greater signal-to-noise ratio than the individual received signals, permitting detection at a greater range or with a lower bit error rate.

The present invention relates to an uplink control channel configuration in a mobile wideband wireless access system, and an allocation method thereof. An uplink control channel includes a long cyclic prefix used to improve interference and distortion caused by multipath transmission characteristics of an initial ranging or handover ranging signal and a periodic ranging or band request ranging signal. In addition, a short orthogonal frequency division multiple (OFDM) symbol is used to transmit uplink control information when one terminal exists or the number of terminals is small.

The invention discloses a photon counting laser radar based on composite pseudo-random coding. The photon counting laser radar is composed of a signal generator, a light intensity modulation device, alaser device, a beam splitter prism, a circulator, an optical system, a scanner, a GM-APD single-photon detector, a photodiode, a photon counting module, and a signal processing module. An overall structure of a transmitting-receiving-same-path type optical reduced system is employed and a scanner is used for carry out scanning and transmitting a laser pulse string, so that the field angle of thelaser radar is extended. After processing on a laser signal transmitted by an optical system by the beam splitter prism, one part of the signal irradiates the photodiode directly to form a light trigger signal and the other part of signal is scanned by the scanner and then the scanned signal is irradiated on a target; an echo signal reflected by the target enters the scanner, the processed signalreturns to a second port of the circulator by the optical signal and enters the GM-APD single-photon detector through a third port of the circulator; the GM-APD single-photon detector records an echosequence and generates a stopping signal; and a detection result recorded by the photon counting module is transmitted to the signal processing module for follow-up processing and flight time of a pulse string is obtained.

The invention provides a laser ranging apparatus. The apparatus comprises: a laser module for generating a collimated detection beam; a receiving objective lens for receiving a reflected beam of the detection beam, wherein the receiving optical axis of the receiving objective lens is parallel to the emergent optical axis of the detection beam; a photoelectric converter for carrying out photoelectric conversion for an image generated by the reflected beam on a focal plane of the receiving objective lens, wherein a sensitization surface of the photoelectric converter is positioned on the focal plane of the receiving objective lens; a control and analysis system connected with the laser module and the photoelectric converter, wherein the size of the sensitization surface of the photoelectricconverter matches with the size of the imaging light spot of the receiving objective lens. According to the present invention, influence on effective light signals due to daylight and noise is reduced, such that the effective light signals are stood out from the background light; by using the photosensitive element with the small sensitization surface, and the small imaging light spot, the weak light signal reflected from the distant place can be aggregated at a maximum, therefore, with adopting the laser ranging apparatus under the sunlight, the ranging capability can be effectively enhanced, and the ranging range is further far.

The invention provides a communication method based on a low-orbit mobile communication satellite. A security positioning and timing (SPT) low-orbit mobile communication satellite signal is generated,and communication is conducted. The signal is characterized in that as for a time domain structure, the communication satellite signal adopts a time division multiplexing system in a time domain; asfor a frequency domain structure, the communication satellite signal adopts a frequency division multiplexing system in a frequency domain; the communication satellite signal adopts a multi-beam and multicolor multiplexing system, each beam uses one or more sub-bands as needed, and meanwhile multicolor multiplexing of the adjacent beams is met so as to lower interference between the beams; at least one of the sub-bands in the communication satellite signal is used for broadcasting a paging channel (PCH) signal; and the sub-bands, except the sub-bands for broadcasting the PCH signal, of the communication satellite signal can be used for a broadband spread spectrum SPT signal, and the SPT signal is broadcasted in N(PCH) time slots of PCH signal broadcasting. A communication navigation fusionSPT signal system is designed, and thus the positioning timing and anti-interference capacity are improved.

The present application relates to a solid-state lidar, and a structure and control method thereof. The solid-state lidar includes a transceiver module, a galvanometer, and a beam expander. The transceiver module includes a transmitting module, a beam splitting module, and a receiving module. The beam expander is configured to expand and collimate the output laser reflected by the galvanometer and then to emit the expanded and collimated laser to a detection area, and is also configured to converge the reflected laser to the galvanometer. In a laser emission process, since the transmitting module has constant transmitting power, the divergence angle of the output laser can be reduced by the beam expander so as to accumulate the output laser energy, improve the energy density of the output laser, and further improve the ranging capability of the lidar. In a laser receiving process, the beam expander having a large receiving aperture can receive more reflected laser so as to also improve the ranging capability. Thus, the receiving aperture of the solid-state lidar is no longer limited by the size of the receiving surface of the galvanometer. In the case of equivalent transmitting power and detectors, the ranging capability of the lidar is improved.

The invention relates to a laser device. The laser device includes a substrate having a positioning portion, a laser device chip which is arranged on the substrate and has a light emitting surface, and a laser beam shaping element which achieves positioning through the positioning portion and is opposite to the light emitting surface of the laser device chip. The invention further relates to a laser device packaging method and a laser radar having the laser device. The laser device is advantaged in that the limit of the vertical direction angle resolution of a laser emitting board assembly (limited only by the fast axis size) can be greatly improved, a precise positioning structure is processed on a silicon base to effectively control the fast axis divergence angle after compression and beam directivity, and ranging performance is improved.

The invention relates to a laser radar system and a control method thereof. The laser radar system comprises a transmitting device and a receiving device, wherein the transmitting device comprises a laser transmitter and a first galvanometer, and the receiving device comprises a laser receiver and a second galvanometer; the first galvanometer is used for reflecting the emergent light beam output by the laser transmitter to a target object; and the second galvanometer is used for receiving the echo light beam and reflecting the received echo light beam to the laser receiver. According to the embodiment of the invention, the interference of the background light to the echo light beam can be reduced, so that the laser radar system can easily identify the effective light information in the light information, thereby improving the distance measurement capability of the laser radar; the transmitting device and the receiving device are arranged in an off-axis mode, installation and adjustmentare easy, and preamble interference is avoided. Meanwhile, all echo light beams can be received through the second galvanometer, the energy utilization rate of the echo light beams is high, and the detection capacity is improved.

The embodiment of the invention discloses a laser radar optical system and a laser radar. The system comprises a transmitter optical unit and a transmitter correction unit; the transmitter optical unit is used for collimating outgoing laser; the transmitter correction unit comprises at least one transmitter cylindrical lens, and is used for correcting the outgoing laser, wherein the bus of the transmitter cylindrical lens is vertical to the directrix of the transmitter cylindrical lens; the directrix of the transmitter cylindrical lens is parallel to the horizontal plane; the symmetrical axisof the transmitter cylindrical lens is superposed with the optical axis of the transmitter optical unit; the transmitter cylindrical lens comprises a first curved surface and a second curved surface;and outgoing light passes through the transmitter optical unit, the first curved surface of the transmitter cylindrical lens and the second curved surface of the transmitter cylindrical lens in sequence. In the embodiment of the invention, an optical correction unit is arranged at the transmitter; influence of the shell of the laser radar to the outgoing laser can be reduced; and thus, the rangingcapability of the laser radar is improved.

The present invention relates to a dual-laser driving circuit and a scanning laser radar ranging device and method. The circuit comprises a voltage doubler unit for outputting a pulsed high voltage toa first node when a first driving pulse signal is received, a power storing and releasing unit used for storing electric energy when a pulse voltage is present at a first node, releasing a first electric quantity to a second node when a second driving pulse signal is received and releasing a second electric quantity to the second node when a third driving pulse signal is received, and a light emitting unit which is used for generating a laser signal of first power when the first electric quantity is inputted at the first node and generating a laser signal of second power when the second electric quantity is inputted at the second node. The scanning laser radar ranging device is realized based on the above circuit. The method is realized based on the above device. According to the embodiment of the present invention, the requirements of human eye safety by near-distance laser power can be ensured, stray light at a close range is filtered, far-distance and near-distance ranging is achieved, and the ranging ability of a lifting device is improved.

A microphone array method for sound source localization comprises steps of setting spatial distribution positions of seven microphones in a seven-element stereoscopic microphone array: s0 (0, 0, 0), s1 (d, 0, d), s2 (-d, 0, d), s3 (0, d, -d),s4 (0, -d, -d), s5 (0, 0, d), s6 (0, 0, -d), wherein, s0 is the microphone at the origin, s1-s6 are 6 microphones distributed at other positions rather than the origin, and d is the distance from s1- s6 to the coordinate axis; establishing a mathematical model for the microphone array according to the spatial distribution positions of the seven microphones; solving the mathematical model and determining the location of the sound source. The microphone array method for sound source localization can effectively improve the ranging performance on the basis of keeping the array size and the number of microphones unchanged and not sacrificing the positioning performances of the pitch angle and the direction angle. The array formation has a better good effect on the positioning of the pitch angle and the direction angle, so as to effectively improve the accuracy of distance positioning while keeping the advantages of high positioning accuracy at thepitch angle and the direction angle in the spatial cross stereoscopic array.

The invention discloses a laser ranging device. The laser ranging device comprises a transmitting module, a receiving module and a control and processing circuit, wherein the transmitting module includes first light sources, a beam combining element and a second light source; the beam combining element couples light beams emitted by the first light sources together to form the second light sourceso as to emit a second light beam; the receiving module includes a pixel array composed of a plurality of pixels; and the control and processing circuit is used for synchronizing trigger signals of the transmitting module and the receiving module to calculate flight time required by the light beam from transmitting to receiving, and calculating a distance of a target object according to the flighttime. The plurality of first light sources are coupled together to form the second light source; and light energy and peak power of emitted light beams are increased, the emitted light beams have advantage of high peak power under a narrow pulse width, different scanning ranging modes are achieved in combination with a scanning element, and the laser ranging device can improve ranging precision and a ranging capacity at the same time.

The invention discloses method and device for the origination of a ranging process in a TDD-OFDMA (time division duplex-orthogonal frequency division multiple access) system, mainly for solving the problem of large influence on the ranging performance of the prior art by a channel frequency selectivity and a near-far effect. The ranging steps comprise: (1) a channel estimation for a downlink frame, (2) a pre-equalization, (3) a code word mapping, (4) an amplitude-limiting processing, (5) an IFFT (inverse fast Fourier transform), and (6) an initial power control. The ranging device comprises a downlink frame channel estimation module, a pre-equalization module, a code word mapping module, an amplitude-limiting module, an IFFT module and an initial power control module. The method and device for the origination of a ranging process in a TDD-OFDMA system disclosed by the invention have the advantage of being capable of eliminating the near-far effect and keeping the orthogonality of a ranging code in a non-fast-transforming frequency selectivity channel; and the method and device are suitable for the origination of a ranging process in a time division multiplexing WiMax (worldwide interoperability for microwave access) or LTE (long term evolution) system.

The invention provides a laser radar which comprises a laser array arranged in a linear array or an area array, a focal plane arranged on a first optical assembly, and the first optical assembly arranged on a transmitting light path and forming an equivalent focal length larger than the focal length of a main lens group unit of a transmitting end. And/or an optical detector array arranged in a linear array or an area array and arranged on a focal plane of a second optical assembly, and the second optical assembly is arranged on a receiving optical path and forms an equivalent focal length larger than the focal length of the main lens group unit at the receiving end. According to the embodiment of the invention, the power density in the point cloud field angle area is improved through the arrangement of the first optical assembly of the light transmitting end, and/or the background light noise power in the point cloud field angle area is reduced through the arrangement of the second optical assembly of the receiving end, so that the distance measurement capability of the radar can be improved.

The invention discloses multi-line laser radar, which comprises a control unit, and a transmitting unit, a receiving unit, a scanning unit, a wireless transmission unit and a power supply unit which are connected with the control unit. The control unit controls the transmitting unit to transmit by receiving trigger signals of the scanning unit at different angles; after the light irradiates a detected object, echo amplification is received through the receiving unit, then timing ranging is conducted on logic level signals, meanwhile, the reflectivity intensity is calculated according to the width of the level signals, and the control unit obtains three-dimensional point cloud in combination with angle information and distance information in the horizontal direction and the vertical direction. According to the invention, the characteristics of a plurality of pixels of an array detector are utilized, angle information is obtained through pixel positions, the array detector uses non-uniform micro-element size arrangement to obtain high-density central area test point clouds, and when the array detector is matched with a receiving lens, the lengths of the two ends of the detector are increased along with edge distortion, so that the uniformity of a receiving angle is facilitated.

The invention relates to a laser radar ranging system. The system comprises a variable gain amplifier, a converter and a controller, the variable gain amplifier is connected with the converter, and the converter is connected with the controller; wherein the controller is used for determining the distance measurement distance between the target object and the optical receiver according to an outputsignal of the converter, and adjusting the gain of the variable gain amplifier according to the distance measurement distance. The controller adjusts the variable gain amplifier to reduce the gain ina short distance and adjusts the variable gain amplifier to increase the gain in a long distance, so that the amplitude of an optical signal detected by the laser radar in long-distance detection isenhanced, the dynamic range of a detection signal of the laser radar is improved, and the distance measurement performance and the distance measurement capability are further improved.