190 results about "Ultra wide bandwidth" patented technology

An indoor local area network (LAN) system using an ultra wide-band (UWB) communication system is provided. The indoor LAN system includes at least one remote terminal including a UWB module for converting input digital data to be transmitted into an analog signal of an ultra wide-bandwidth and wirelessly transmitting the converted analog signal via an antenna of the remote terminal. The UWB module receives an analog signal of the ultra wide-bandwidth via the antenna and converts the received analog signal into a digital signal. The indoor LAN system further includes at least one access point for performing USB-based wireless communication with the remote terminal in a corresponding area. The access point is adapted to receive the analog signal of the ultra wide-bandwidth transmitted from the remote terminal and convert the received analog signal into an optical signal.

An asymmetric bandwidth communication system enables wireless communication between interrogators/readers and transponders/tags. A transponder transmits TDCIR (Time Domain Carrierless Impulse Radio) signals in the uplink direction and receives non-TDCIR signals, such as electromagnetic continuous waves, in the downlink direction. The transponder may receive partial or whole power from non-TDCIR signals. The TDCIR utilizes electromagnetic impulses with short duration and ultra wide bandwidth. It offers high data rate reliable communication at low power and design complexity. It also demonstrates resilience against path fading, selective absorption and reflection by physical matters and excellent location determination capabilities.

An electrically small, planar ultra wide bandwidth (UWB) antenna is disclosed. The antenna has a conductive outer ground area that encompasses a tapered non-conducting clearance area, which surrounds a conductive inner driven area. The feed is unbalanced with the terminals are across the narrowest part of the non-conducting clearance area which is tapered to provide a low VSWR across ultra wide bandwidths exceeding 100%. The antenna can be arrayed in 1D and 2D on a single common substrate. Amplifiers can be readily mounted at the feed.

In a first aspect the present invention provides a method of producing an ultra wide band signal in which a carrier signal is modulated by a spreading waveform which is a periodic deterministic wideband signal and the frequency of the carrier signal is changed by a predetermined amount at predetermined intervals (the reciprocal of this interval being the hopping rate), wherein there is a harmonic relationship between the carrier frequency, the predetermined amount of frequency change, and the period of the spreading waveform. In this way, an ultra wide band signal is created using both direct sequence and frequency hopping techniques and the signal so created may be detected using a coherent detector at a receiver. This provides a wide bandwidth signal, or even an ultra wide bandwidth (UWB) signal which mitigates the problems of multi-path signals (through coherent combining across a wide bandwidth) and also interference.

The invention discloses a system and a method for locating an inspection robot in a petrochemical plant. The system comprises a global positioning system (GPS) observation unit, an ultra-wide bandwidth (UWB) observation unit, a visual observation unit, a laser observation unit, a mileage observation unit, a combination decision module, an inertial state estimation module, an available positioningobservation/strapdown inertial navigation system (SINS) combination module, and a positioning information fusion module. The GPS observation unit, the UWB observation unit, the visual observation unit, the laser observation unit and the mileage observation unit acquire the respective observation data and send same to the combination decision module; the combination decision module performs multi-layer map-based positioning by combining an environmental map model stored in an environmental model prior information module so as to determine available observation types; the available positioning observation/SINS combination module combines available observation data with a corresponding motion equation established by an inertial state estimation module, and the combined result is sent to the positioning information fusion module for carrying out final integrated pose estimation. The system and the method solve the problem of seamless positioning of the inspection robot which runs in various complicated regions of the petrochemical plant, and guarantee the continuity of a positioning process and the stability of the positioning result.

An ultra wide bandwidth communications system, method and computer program product including an ultra wide bandwidth timing generator. The timing generator includes a high frequency clock generation circuit having low phase noise; a low frequency control generation circuit; and a modulation circuit coupled between the high frequency clock generation circuit and the low frequency control generation circuit. The high frequency clock generation circuit generates a plurality of high frequency clock signals. The low frequency control generation circuit generates a plurality of low frequency control signals. The modulation circuit modulates the high frequency clock signals with the low frequency control signals to produce an agile timing signal at a predetermined frequency and phase. The agile timing signal is generated at the predetermined frequency and phase by adjustments to at least one of frequency of the low frequency control signals, phase of the low frequency control signals, frequency of the high frequency clock signals, and phase of the high frequency clock signals.

The embodiment of the invention provides an antenna and a wireless communication device. The antenna is connected with a conductive substrate, and comprises a first radiator, a feed point and a second first radiator, wherein the first radiator is formed as a closed metal ring; one end of the feed point is connected with the first radiator, and the other end of the feed point is connected with the conductive substrate; the second radiator is formed as the metal ring which is closed or has an opening; the second radiator is adjacent to the first radiator according to a preset distance; and a gap is reserved between the first radiator and the second radiator. The antenna has ultra-wide bandwidth, and the working frequency band of the antenna is from 824MHz to 2484MHz and covers GSM850, GSM900, DCS, PCS, UMTS2100, GPS, Bluetooth and other frequency bands commonly used by the conventional wireless communication device. Therefore, the ultra-broadband of the antenna is realized so as to allow the wireless communication device to support more frequency bands.

An ultra-wide bandwidth antenna. The antenna comprises a serially electrically connected top radiator, side radiator and bottom radiator. Geometrically, the top radiator, side radiator and bottom radiator form a U-shaped structure. A meanderline conductor is connected between the bottom radiator and ground. The top radiator is connected to a signal feed.

The invention relates to a small high-isolation double-notch UWB (Ultra-wide Bandwidth) MIMO (Multiple Input Multiple Output) antenna, which comprises a main floor board, a first floor board limb, a second floor board limb, a first metal strap, a second metal strap, a third metal strap, a first antenna unit, a second antenna unit, a first tail end opening gap and a second tail end opening gap, wherein the third metal strap is used for connecting the two floor board limbs. Due to the application of the two floor board limbs, a first excitation port and a second excitation port can be placed on the upper edge of a basal board, so that the impedance bandwidth of the antenna units can be effectively improved, and the isolation between the two antenna units is also effectively increased. The technical problem that the current UWB MIMO antenna cannot simultaneously realize small size, small cross coupling and wide bandwidth is solved. The first metal strap and the first antenna unit form a first annular loop, the second metal strap and the second antenna unit form a second annular loop, so that the high frequency notch is realized. Due to the application of the first tail end opening gap and the second tail end opening gap, the low frequency notch is realized. Therefore, the double-notch function is realized.

A receiver correlator structure for an ultra wide bandwidth communication system includes an antenna, a mixer, a bandpass filter, and a convertor. The receiver receives, via the antenna, an ultra wide bandwidth signal comprising a sequence of wavelets of particular shapes and positions, and transmits the received ultra wide bandwidth signal to the mixer. The mixer also receives and mixes with the received ultra wide bandwidth signal a local ultra wide bandwidth signal comprising a sequence of wavelets of particular shapes and positions correlated to the received ultra wide bandwidth signal. The bandpass filter removes the DC components from the mixed signal, and provides the resultant signal to the convertor. The receiver structure eliminates the local ultra wide bandwidth signal AC bias and DC bias terms and 1/f noise, yet detects long sequences of logical 1's and 0's, and allows operation with reduced bandwidth convertors.

The invention provides a ground moving target detection and parameter estimation method. The technical scheme realizes the moving target detection and two-dimensional velocity estimation by combining with an interference image sequence with multiple sub-bands and sub-apertures on the basis of a three-way ultra-wide bandwidth (UWB) synthetic aperture radar (SAR) image. The specific steps of the method are as follows: 1, generating a sub-band sub-aperture image sequence; 2, generating a sub-band sub-aperture interference image sequence; 3, detecting the moving target; and 4, estimating the two-dimensional velocity of the moving target. By using the ground moving target indication and parameter estimation method provided by the invention, the moving target and a static target can be distinguished on an imaging position and a phase position; the radial velocity of the moving target can be estimated clearly; and the azimuth speed and distance speed can also be estimated.

The invention relates to a life detection radar device, in particular to an ultra-wide bandwidth microwave chaos life detection radar device for detecting human body life feature information and distance information. The ultra-wide bandwidth microwave chaos life detection radar device can be used for disaster rescue and comprises a first signal generator, a first power splitter, a frequency mixer, a power amplifier, an ultra-wide bandwidth emitting antenna, an ultra-wide bandwidth receiving antenna, a low noise amplifier, an I/Q demodulator, a second signal generator, a second power splitter, a voltage-controlled phase shifter, an adjustable attenuator, a solid state microwave sensor, a third signal generator, a phase-locked amplifier and a signal collecting and processing module. The life feature information and the position information of trapped persons can be rapidly and accurately detected.

The invention relates to a high-precision positioning and inspection system based on an unmanned aerial vehicle applicable to a transformer substation. The high-precision positioning and inspection system comprises an unmanned aerial vehicle system, a UWB (Ultra-wide Bandwidth) positioning system and a ground operation and maintenance control center, wherein the unmanned aerial vehicle system comprises at least one transformer substation unmanned aerial vehicle capable of resisting strong electromagnetic interference, and an airborne unmanned aerial vehicle UWB label module; the UWB positioning system comprises a plurality of UWB positioning base station modules arranged at each position in the power substation, and an environment monitoring module and a wireless communication module whichare connected with the UWB positioning base station modules; the UWB positioning system and the ground operation and maintenance control center have mutual data through the wireless communication module; the unmanned aerial vehicle is wirelessly communicated with the ground operation and maintenance control center; the unmanned aerial vehicle UWB label module is communicated with the UWB positioning base station modules through emitted ultra wideband electromagnetic wave. According to the high-precision positioning and inspection system provided by the invention, high-precision positioning ofthe unmanned aerial vehicle in the transformer substation, issuing of a flight task instruction and inhibition of the strong electromagnetic interference are realized, so that state inspection of electric power equipment of the power substation is realized.

The combination of a Vivaldi notch and a meander line loaded antenna for ultra wide bandwidth is provided with dual polarity by providing orthogonally oriented Vivaldi notched structures coupled to each other at the edges thereof. Mode selection is provided by selectively switching between linear and circular polarization modes through selective input coupling techniques. Each side of the dual polarity Vivaldi notch/MLA plates includes a bifurcated plate with one end of the bifurcated plate having exponentially curved Vivaldi notch surfaces ahead of a cavity opened at the rear end to the bifurcated notch. The side plates for the top plate structure are themselves Vivaldi notch structure, with their side plates being the ajoining top or bottom plate. In each case, internally carried meander lines connect the adjacent together.

A method and system communicates ultra wide bandwidth signals using orthogonal frequency division multiplexing modulation. QPSK input symbols are frequency interleaved. The frequency interleaved symbols are spread over a plurality of tones, and the tones are modulated for transmission over an ultra wide bandwidth channel. When the tones are received, the received tones can be de-spreaded to recover the input symbols.

The invention provides a stage-matching-adjustable CMOS (complementary metal oxide semiconductor) ultra-wideband low-noise amplifier circuit which at least comprises a signal access circuit, a signal extraction circuit, a stage matching circuit and a second-stage amplifying circuit. The signal access circuit realizes matching of ultra-wideband input signals on the basis of a negative feedback circuit connected with a first MOS (metal oxide semiconductor) tube; the signal extraction circuit and the signal access circuit jointly form a first-stage amplifying circuit, signals outputted by the signal access circuit are extracted to a second MOS tube on the basis of a high-frequency matching circuit and a low-frequency matching circuit, the high-frequency matching circuit is connected with the first MOS tube and the second MOS tube, and the low-frequency matching circuit is connected with the second MOS tube; signals outputted by the signal extraction circuit are coupled by the stage matching circuit on the basis of adjustable capacitors; and signals outputted by the stage matching circuit are amplified by the second-stage amplifying circuit on the basis of common-source and common-gate circuits. The stage-matching-adjustable CMOS ultra-wideband low-noise amplifier circuit has the advantages of low noise, power consumption, fabrication error influence and cost, high gain and gain flatness, ultra-wide bandwidth, simple structure and the like, and is applicable to UWB (ultra wideband) communication systems.

A method eliminates spectral lines and shapes the power spectral density of an ultra bandwidth signal. First, a train of pulses is generated. The pulses are then modulated in time according to symbols. A polarity of the pulses is inverted randomly before transmitting the pulses as an ultra wide bandwidth signal.

The invention discloses an ultra-wide bandwidth radar type non-contact life parameter real-time monitoring system which comprises a UWB (Ultra-Wide Bandwidth) radar front end and a signal processing display unit. The system can realize real-time and non-contact monitoring on physiological parameters of a human body, such as respiration, body movement signals, respiratory rate, and the like under the condition of penetrating through a thicker nonmetal obstacle. The ultra-wide bandwidth radar type non-contact life parameter real-time monitoring system is mainly used for the physiological parameter monitoring of patients which are not suitable for being connected with electrodes and a sensor in a ward, such as large-area burn patients, and the like, can be also used for carrying out non-contact real-time monitoring on buried wounded people (who can not be rescued in short time) in the disasters, such as earthquake, and the like and provides necessary reference for search and rescue staffs applying medical rescue to learn the vital sign condition of a rescued object at any time.

The invention provides an intelligent warehouse management system, comprising a goods identifying module, a forklift positioning module, a warehouse intelligent operation management system, and a three-dimensional warehouse visualization system; wherein the goods identifying module is arranged on a forklift tray, and is used for transmitting goods information to the warehouse intelligent operationmanagement system through a wireless network; the forklift positioning module is used for monitoring real-time position information of a forklift pasted with a positioning label, and enabling a UWB (Ultra-wide Bandwidth) base station to enable the position information to access the warehouse intelligent operation management system through a wired network; and the warehouse intelligent operation management system is used for associating and matching the goods information with the position information of the forklift, so as to generate a real-time position of the goods information. The intelligent warehouse management system of the invention has the beneficial effects of capacity for solving the problems of separated goods information and storage location information, and low feedback efficiency, inaccurate information, non-transparent process, and incapable tracing of a conventional manual mode in the prior art.

The invention discloses a UWB (Ultra-wide Bandwidth)-based communication and positioning method and an integrated system for multi-uavs close formation flight. The method is as follows: in a "lead aircraft-wingman" formation, a lead aircraft flies according to a set air route, and a wingman autonomously "follows" the lead aircraft to complete the formation; a GPS module and a UWB module are installed on the lead aircraft to complete positioning, a flight control module is installed on the lead aircraft to complete flight control, and inter-aircraft communication equipment is installed on the lead aircraft to complete aircraft station communication and inter-aircraft communication; a processor is installed on the wingman is achieve a formation control algorithm; and in the formation process, the GPS module is used to guide the wingman to approach the lead aircraft, and when the relative distance between the aircrafts reaches the effective working distance of the UWB, data of the UWB areintroduced to achieve close formation. The system is used to implement the above method. The UWB-based communication and positioning method for the multi-uavs close formation flight provided by the invention has the advantages of being simple in principle, easy to implement, good in reliability and the like.

The invention provides a waist type wearable indoor mobile positioning terminal which comprises a power supply module, an ultra-wide bandwidth (UWB) locating module, a Bluetooth transmission module, a Zigbee transmission module, an inertial navigation module, an information processing module and a locating waist, wherein the UWB locating module is in two-way connection with the Bluetooth transmission module; the inertial navigation module is in two-way connection with the Zigbee transmission module; the Bluetooth transmission module and the Zigbee transmission module are respectively connected with the information processing module; the information processing module is arranged on the locating waist; the power supply module is used for supplying power for the other modules in the terminal. According to the waist type wearable indoor mobile positioning terminal, UWB locating and inertial navigation locating are fused and integrated into a special locating routing inspection waist, and a sound-light alarm signal can be sent out when the mobile positioning terminal enters a dangerous zone mistakenly; a wearable device which is in accordance with electric power security specification, is convenient to carry and is integrated with a high-accuracy wireless positioning technology is formed; after the waist type wearable indoor mobile positioning terminal is adopted, workers in the dangerous zone in a room can be conveniently and accurately located, so that the personal safety is guaranteed.

The invention relates to a compressively sampling and receiving system for impulse ultra-wideband signals, which is characterized by comprising a multichannel sampling unit for distributing a plurality of channels for the impulse ultra-wideband signals to perform parallel sampling, a measuring waveform generator for respectively sending measuring waveforms to channels of the multichannel sampling unit, and a digital rear-end receiving processing unit for receiving measured values sampled by the multichannel sampling unit. The impulse ultra-wideband signals are continuous multiframe signals; the measuring waveforms generated by the measuring waveform generator are irrelevant to impulse ultra-wideband receiving signals which enter the multichannel sampling unit; the channels respectively linearly project the impulse ultra-wideband receiving signals according to the measuring waveforms generated by the measuring waveform generator; and the digital rear-end receiving processing component processes the measuring values sampled by the multichannel sampling unit. The compressively sampling and receiving system for the impulse ultra-wideband signals does not require high sampling speed, long delay line or exact channel estimation, and can fully exploit the potential of the high-speed communication and the high-precision distance measurement of the Infrared Radiation-Ultra Wide Bandwidth (IR-UWB).

A locator system to be associated with a mobile person includes a receiver to receive ultra-wide bandwidth signals and a transmitter to transmit ultra-wide bandwidth signals. The transmitter is adapted to transmit ultra-wide bandwidth signals, and the receiver is adapted to receive ultra-wide bandwidth signals from at least one other locator system. The other locator system includes a receiver to receive ultra-wide bandwidth signals and a transmitter to transmit ultra-wide bandwidth signals. The locator system and the at least one other locator system provide a distance between the locator system and the at least one other locator system so that the locator system can be located without establishing a reference ultra-wide bandwidth locator system. The locator system can be adapted to be in a low-power mode until activated upon communication of an activation signal to the locator system. A safety system is adapted to be associated with a mobile person and includes a locator system including a receiver to receive ultra-wide bandwidth signals and a transmitter to transmit ultra-wide bandwidth signals. The safety system further includes a telemetric communication system adapted to communicate telemetric data and sensor system including at least one sensor adapted to measure at least one parameter. The locator system is adapted to be in a low-power mode until activated upon communication of an activation signal to the locator system. The locator system transmits ultra-wide bandwidth signals periodically and receives periodic ultra-wide bandwidth signals from at least one other like locator system upon activation.