114 results about "Broadband pulse" patented technology

Methods and apparatus that transmit ultra-wideband pulses through twisted-pair wire media are provided. One method includes transmitting an ultra-wideband pulse through the twisted-pair wire media at dissimilar time periods. Another method includes transmitting an ultra-wideband pulse through the twisted-pair wire media at dissimilar radio frequencies. Yet another method includes transmitting an ultra-wideband pulse through the twisted-pair wire media at dissimilar time periods and at dissimilar radio frequencies. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

An ultra-wideband pulse modulation system and method is provided. One method of the present invention includes transforming data into a ternary data set with data being represented with states of zero, positive one and negative one. The modulation and pulse transmission method of the present invention enables the simultaneous coexistence of the ultra-wideband pulses with conventional carrier-wave signals. The present invention may be used in wireless and wired communication networks such as hybrid fiber-coax networks. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

An orthogonal wavelet division multiplexing (OWDM) communication system including a synthesis section and a channel interface. The synthesis section includes a filter pair bank with multiple inputs and an output that provides an OWDM signal. Each input receives a corresponding symbol of a supersymbol, where the symbols are from a selected modulation scheme. The synthesis section generates the OWDM signal as a combination of weighted OWDM pulses, where each weighted OWDM pulse represents of a symbol of the supersymbol. An OWDM Spread Spectrum (OWSS) communication system that uses broad-time and broadband pulses generated from a family of OWDM pulses together with a set of orthogonal PN code vectors. The OWSS pulses are mutually orthogonal and allow multi-user operation. Each user is assigned an OWSS pulse corresponding to a particular PN code. OWSS enables high rate operation for wireless channels with the use of an equalizer with FE and DFE sections.

A baseband signal converter device for an impulse radio receiver combines multiple converter circuits and an RF amplifier in a single integrated circuit package. Each converter circuit includes an integrator circuit that integrates a portion of each RF pulse during a sampling period triggered by a timing pulse generator. The integrator capacitor is isolated by a pair of Schottky diodes connected to a pair of load resistors. A current equalizer circuit equalizes the current flowing through the load resistors when the integrator is not sampling. Current steering logic transfers load current between the diodes and a constant bias circuit depending on whether a sampling pulse is present.

Ultra wide band communication systems and methods are provided. In one embodiment, an ultra wide band communication system includes a first and a second communication device. A lowest common ultra wide band pulse repetition frequency is determined, and data is transmitted between the communication devices using the lowest common ultra wide band pulse repetition frequency. In another embodiment, a first and second slave transceiver communicate with a master transceiver using a time division multiple access frame, with the master transceiver providing transmission synchronization. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

An ultrasonic beamformer may include an input signal line for each ultrasonic transducer element configured to carry a broadband pulse from the ultrasonic element. The ultrasonic beamformer may include a number of signal shifters that is substantially less than the number of transducer elements. Each signal shifter may be configured to shift a broadband pulse in a way that is different from the way the other signal shifters are configured to shift a broadband pulse. For each of the input signal lines, a multiplexer may be configured to electrically connect the broadband pulse received on the input signal line to a selected one of the signal shifters. A multiplexer controller may be configured to generate the control signal for each of the multiplexers in a fashion that causes the ultrasonic beamformer to substantially compensate for the differences in the distances. A comparable configuration may be used for transmission.

The present invention discloses a multi-broadband pulsed light emitter (MPLE) (1000) for applying an effective dermal treatment characterized by painless feature despite a high amount of applied light energy, and is also characterized by avoiding high excessive overheating of the skin layers, said MPLE is adapted to deliver energy of homogeneous and concentrated distribution (100) throughout a large focal spot (10), comprising; (a) a large broadband polychromatic source module (200), which provides a controlled pulsed light radiation for irradiating a predetermined portion of a skin to be treated (300); (b) a controller (400) adapted to select parameters selected form a group including intensity of output energy, pulse duration and number of pulses; and, (c) a cooling mechanism for simultaneously cooling both light source (250) and said treated portion of skin (300).

The invention discloses a millimeter-grade micro-motion measuring method based on a synthetic broadband pulse Doppler radar. By employing the phase-deduction velocity and range measurement technology, the target movement is precisely measured, and an iteration motion parameter combined estimation method is employed to measure the target millimeter-grade micro-motion and extract target motion parameters precisely; compared with a conventional narrowband micro-motion measuring method, the millimeter-grade micro-motion measuring method is a phase-grade high-precision micro-motion measuring method, the range-measuring precision is the millimeter grade, the velocity-measuring precision is centimeter / second grade, and the requirement of high-precision range and velocity measurement of the radar for micro-motion extraction is satisfied; high resolution ability for the distance is provided, scattering points of a complex target can be separated, and distance and motion information of different scattering points of the target can be simultaneously obtained; the broadband PD processing method can realize echo coherent accumulation and effectively suppress static and low-speed clutters; and with the combination of track filtering information, the broadband enveloping range / velocity measurement precision can be improved, and the requirement of the signal to noise ratio by correct phase unwrapping is reduced.

This invention discloses an electrochemical electronic tongue based on broadband pulse voltammetry, composed of the electrode array, broadband pulse scanners and data analysis software. The electrode array is electrochemical electrode group that is made up with the reference electrode, auxiliary electrodes and multi - the work - a multi-channel electrode. The data analysis software is installed on the computer; electrode array will be placed analyte solution system. The broadband pulse scanner output pulse of a number of different scanning frequency signal, and then the signal is imposed on the analyte solution through parameter electrode of electrode array and working electrode. The circuit response signals produced by the solution return to broadband pulse scanner through secondary electrode. The invention can detect overall features of material and the differences between the material characteristics effectively, and has analytical speed, wide frequency range, access informative features.

The invention discloses a compressive sense ultrasound imaging method through GPU (graphics processing unit) and solves the problem that the imaging reconstruction is performed slowly by the compressive sense theory. The method includes 1, according to a set resolution, discretizing the detection region and performing broadband pulse scanning on the region, acquiring echo vectors and observation matrix, and establishing an ultrasound imaging mathematical model; 2, partitioning and copying the echo vectors and observation matrix to a GPU video memory; 3, calculating an iteration step in the GPU; 4, substituting the iteration step into a fast iterative shrinkage threshold algorithm to figure out a reconstructed observation scene scattering intensity; 5, copying the scattering intensity to a main memory and arraying two-dimensional matrix, and obtaining a reconstructed ultrasound image. Compared with a traditional fast iterative shrinkage threshold algorithm, the method has the advantages that the reconstructing time is reduced by the millisecond level from the minute level, the real-time performance of ultrasound imaging is improved greatly, and the method can be applied to the field of real-time ultrasound processing.

A sensing system includes plurality of sensors along the lengths of input and output optical fibers. Each sensor receives broadband pulses from the input fiber, dynamically senses a plurality of physical parameters in a one-to-one correspondence with a plurality of predefined wavelength bands, and forms signal pulses from the broadband pulses by transmitting only a single wavelength within each wavelength band. Each single wavelength has a dynamically-varying peak wavelength value indicative of the corresponding sensed physical parameter. The signal pulses from the output optical fiber are directed into one or more interferometers, which produce a phase deviation corresponding to each dynamically-varying peak wavelength value.

A method estimates a time of arrival of a signal received in a wireless communication system. An energy in a frame of a received signal is measured to determine a block in the frame, the block representing a coarse time of arrival of the received signal. Multiple time-delayed versions of a template signal are combined with the block of the received signal to select a particular template signal. The particular template signal identifies a particular chip representing a fine time of arrival of the received signal.

A broadband pulse width modulation circuit is provided which can achieve high speed responsibility while assuring an advantage of a pulse width modulation (PWM) circuit having a good power efficiency in order to satisfy a demand for reduction of power consumption and a demand for high speed responsibility in the field of optical communication. The broadband PWM circuit includes a PWM circuit for modulating and smoothing a pulse width in response to an input voltage signal to supply electric current to a load, a frequency band selection and amplification circuit for selectively amplifying only a specific frequency band of the input voltage signal, and a composition circuit for combining electric current from the pulse width modulation circuit and the electric current amplified by the frequency band selection and amplification circuit.

The invention discloses a chirped pulse velocity interferometer. In the chirped pulse velocity interferometer, broadband laser pulses output by a broadband pulse laser light source are changed into linear polarization linear chirped pulses after passing through a polarizer and a pulse stretcher; polarization light S and polarization light P which are perpendicular in polarization direction are produced after the linear chirped pulses pass through a polarization splitting prism, and then the polarization light S and the polarization light P are successively emitted into the surface of a tested sample; the beat-wave interferometry is conducted on reflected light at a certain included angle, and produced beat-wave interferometric fringes are recorded through an imaging type spectrometer. A certain delay time difference exists before the polarization light S and the polarization light P are emitted into the surface of the sample, and synchronous transmission is achieved through optical path compensation after the polarization light S and the polarization light P are reflected by the surface of the sample. The oscillation penetrating direction of the polarizer is perpendicular to that of an analyzer. By means of the chirped pulse velocity interferometer, the time distinguishing of sub-picosecond scale can be achieved, the imaging type spectrometer serves as the corresponding recording system, an expensive streak camera recording system is avoided, and therefore the cost of a test system is effectively controlled.

The number of sensors that can be used by an SSA system including a single source can be increased by using a multi wavelength source to send different wavelength pulses to each of a plurality of different sensor array ladders, particularly Sagnac sensor array (SSA) ladders. More particularly, each broadband pulse from a broadband source is wavelength divided into a plurality of narrower pulses with each narrower pulse being used in a separate sensor array ladder.

Disclosed is an ultra broadband pulse signal modulation and demodulation method in fractional fourier transform field, which relates to an information modulation and demodulation technology in an ultra broadband system. The invention solves the problem of low transmission efficiency in the PAM, PPM modulation methods which use one channel of pulse as the information transmission carrier during communication. The process of the modulation is: divide the multi-ary digital information source into two parallel channels of digital information; and then through the transmitting antenna, transmit the transmitting pulse which is obtained by respectively modulating and adding the two channels of digital information with a real chip signal and a gaussian signal under the control of a transmitting clock. The process of the demodulation is: filter the received pulse signal and sample the signal under the control of the receiving end clock; then transform the signal to p order fractional fourier transform field; and then map the two channels of digital signal which is obtained by performing correlation demodulation on the transformed signal with the real chip signal and the gaussian signal into one channel of multi-ary digital information. The gaussian signal can also be real chip signal. The ultra broadband pulse signal modulation and demodulation method of the invention can be applied in ultra broadband pulse communication system.

The invention discloses a time domain lens compression system based method for generating ultra-wideband pulse of arbitrary waveform. The method comprises the following steps: generating a wideband time domain pulse signal in a frequency domain by using an arbitrary waveform generator (AWG); respectively generating a positive amplitude part and a negative amplitude part of the wideband time domain pulse signal by using two output ports of the AWG; respectively modulating the positive amplitude part and the negative amplitude part into an optical pulse signal; compressing the two optical pulsesignals by using a time domain lens system; and detecting one compressed optical pulse signal with the other optical pulse signal by a differential photoelectric detector after one compressed opticalpulse signal is subjected to optical delay so as to acquire the ultra-wideband pulse signal. By using the time domain lens compression system, the method can flexibly and conveniently generate a narrow pulse signal with an arbitrary waveform, can effectively overcome the encountered difficulty in generating narrow pulse in the frequency domain, contributes to confusion with the optical fiber communication technology, and plays an important role in communication systems, radar systems, the sensor technology and other scientific fields as an implementation scheme of an optical AWG.

The invention discloses a pulse super-broadband receiver which comprises a controllable gain amplifier and a triggering receiver in mutual connection, wherein the controllable gain amplifier amplifies a received RF signal and outputs the RF signal to the triggering receiver, and the triggering receiver judges whether the energy of the amplified RF signal excesses the preset value, if the energy of the amplified RF signal excesses the preset value, asynchronous triggering is carried out to obtain high electric level, or else, low electric level is obtained. The pulse super-broadband receiver uses a simple digital logic circuit for receiving the super-broadband pulse, avoids the limitations of high power consumption, complex circuits, difficult integration, and the like of the traditional synchronous sampling receiving method in receiving super-broadband signals, has the advantages of simple circuits, easy integration and low power consumption, and is particularly suitable for the super-broadband pulse communication. The invention can correctly receive the signal and greatly reduce the power consumption and the complexity of the receiving circuit, and is helpful for chip realization.

The invention relates to the field of underwater acoustics and more particularly to the field of signal processing in a low frequency (LF) active sonar system. The present invention makes it possible to decrease the false alarm rate while retaining the classification of the objects. The subject of the invention is a method of processing signals received corresponding to a signal emitted comprising by recurrence two pulses, a first Doppler tolerant broadband pulse of HFM type in particular and a second Doppler intolerant broadband pulse of BPSK type in particular, comprising: a step of detecting objects performed on the part of the signal received corresponding to the first pulses and providing an alarm for each object detected, and a step of classifying the objects detected performed on the part of the signal received corresponding to the second pulses for the alarms satisfying at least one predetermined criterion.

The invention discloses a radio frequency radiation type simulation broadband pulse radar imaging equivalent simulation method. The radio frequency radiation type simulation broadband pulse radar imaging equivalent simulation method comprises steps that 1, a target echo signal is acquired; 2, a compressed sensing measuring matrix is constructed; 3, an intermittent transmitting-receiving echo segmented sparse observation model is established; 4, a target high resolution range profile is reconstructed. The radio frequency radiation type simulation broadband pulse radar imaging equivalent simulation method is advantageous in that 1, a transmitting-receiving signal shielding problem of a pulse radar in a microwave darkroom in a transmitting-receiving common antenna system is solved; 2, the construction of the target echo segmented sparse observation measuring matrix is realized; 3, the intermittent transmitting-receiving echo segmented sparse observation model is established; 4, the accurate reconstruction of the peak value position and the amplitude of the target high resolution range profile is realized.

The invention provides an SPR measuring method and a measuring system thereof. According to the measuring method, first, a linear-polarized coherent broadband pulsed light beam is incident onto a surface of a sample under detection of a SPR sensing device to cause reflection; next, a time-domain monotonous chirp is performed on the incident coherent broadband pulsed light and / or the SPR reflected light; finally, the time-domain monotonically chirped SPR reflected light beam is detected, and information of the SPR effect is obtained according to the detected signal. According to the invention, the spectrum detection method used in conventional slow wavelength interrogation is converted into the high-speed real-time detection of time-domain pulse shape signals. Thus, the procedure of the SPR reaction may be monitored closely, and dynamical curves with very high time resolution may be obtained, in that case, fast biochemical reaction procedures may be monitored. As each part of the measuring system may remain fixed during the measurement, a compact, miniature and portable system may be realized. The interrogation part of the sensing system is easy-to-realize, of low cost and compatible with various SPR devices and components.

A system and method to detect broadband pulses in the presence of multiple strong narrow band interferers is disclosed whereby a dynamic filtering method is used to detect and notch out the interfering signal by forming notch filters at the precise location of the narrow band interferers.

The invention relates to a wide-band signal processing system and method for acoustic Doppler current section apparatus, including an acoustic Doppler current section apparatus module, a signal processing mainboard plus a data collecting card, a computer system and cables, where the acoustic Doppler current section apparatus module inputs the received wide-band analog sound signal into the data collecting card by the cables, the data collecting card collects the analog sound signal and directly sends the collected data to the signal processing mainboard for processing, and the computer system operates the whole course and displays the results by pictures. Its advantages: for increasing the accuracy and space resolution of ocean current measurement, it adopts m-sequence code wide-band pulse signals and adopts multiple relative signal processing technique to extract two or many phase differences of same m-sequence code wide-band pulse signals and thus obtaining the moving speed of the apparatus relative to the sea water or seabed, and it has high stability for long working and is not limited by frequency and pulse width.

The invention relates to a broadband pulse electric field test probe comprising a metal shielding box, an electronic circuit board which is fixed in the metal shielding box, an antenna mounting base which is welded on the electronic circuit board, and a unipolar cylindrical antenna which is fixed in the antenna mounting base via threads and stretches out of the metal shielding box. The unipolar cylindrical antenna and the metal shielding box are maintained to be electrically insulated. The electronic circuit board is provided with a voltage follower and an electro-optical conversion circuit which are electrically connected in turn. The electro-optical conversion circuit comprises a semiconductor laser device and a driving circuit thereof. The unipolar cylindrical antenna is connected with the input end of the voltage follower. The tail fiber of the semiconductor laser device is connected with an external optical fiber link via an optical fiber adapter flange which is fixed on the metal shielding box. The objective of the invention is to provide the broadband pulse electric field test probe based on optical fiber transmission, and the broadband pulse electric field test probe is broadband, wide-range and high in anti-interference capacity.

A system is provided for substantially continuously monitoring an electromagnetic intensity of short bursts of electromagnetic waves (E-waves) having frequencies within a broad frequency range. The system includes at least one antenna capable of detecting one or more bursts of E-waves and converting the bursts into radio frequency (RF) signals having an energy level correlated to the intensities of the E-waves. The system additionally includes at least one broadband equalizer that normalizes the energy levels of RF signals across the broad range of frequencies and at least one amplifier that amplifies the energy levels of the RF signals output by the broadband equalizer. The system further includes at least one RF peak power sensor for measuring the energy levels of the RF signals output from the amplifier and determining the peak power level of at least one peak RF signal that has the highest energy level. Further yet, the system includes at least one power meter that converts the peak power level of the peak RF signal to power units and a computer based device that utilizes the power units output by the peak power measurement subsystem to determine the strength of the E-wave correlated with the peak RF signal.

A method estimates a time of arrival of a signal received in a wireless communication system. An energy in a frame of a received signal is measured to determine a block in the frame, the block representing a coarse time of arrival of the received signal. Multiple time-delayed versions of a template signal are combined with the block of the received signal to select a particular template signal. The particular template signal identifies a particular chip representing a fine time of arrival of the received signal.