90 results about "Receiver system" patented technology

Some embodiments relate to a communication network comprising at least one receiver system optically coupled to a plurality of transmitter systems for transmission of synchronization signals generated by the at least one receiver system to the plurality of transmitter systems over a unidirectional synchronization channel. The at least one receiver system configured to embed into the synchronization signals thereby generated additional data indicative of an internal time count thereof for synchronization of transmission of data / signals from each one of the plurality of transmitter systems to said at least one receiver system over a sparse data / signals unidirectional communication channel.

A receiver system has at least one antenna that receives a plurality of signals, including a desired signal, across a wide band of frequencies. At least one tunable filter is in signal communication with the at least one antenna, and filters the plurality of signals to produce a plurality of filtered signals. Gain control circuitry is in signal communication with the at least one tunable filter, and produces a gain adjusted version of the filtered signals. A processing unit processes received signals in a portion of the wide band to extract signal characteristics of at least one undesired signal in the portion of the wide band. The at least one tunable filter is tuned based at least in part on the signal characteristics of the at least one undesired signal to maintain the SNR of the desired signal above a threshold level at the output of the gain control circuitry.

An optical communication receiver system for a mobile platform includes: a surface having an entrance aperture for entry of an optical communication signal from a remote source; an optical receiver to receive the optical communication signal through the entrance aperture; a reflective layer over at least a portion of the surface to at least partially reflect an alignment beam that is substantially coincident with the optical communication signal; a camera positioned to detect the reflected alignment beam; a processor to determine alignment information about the alignment beam relative to the entrance aperture based on the reflected alignment beam detected by the camera; and a transmitter to transmit the alignment information to the remote source to enable the remote source to center the optical communication signal in the entrance aperture.

Systems and methods for providing a dynamic delay factor for using a remote control. A plurality of remote-control button presses are received by from a user. At least one button press time associated with the plurality of remote-control button presses is determined. A delay factor is generated for the user based on the at least one button press time. And at least one content receiver event, such as a wait time for a next button press or a length of time to display a menu, is employed based on the generated delay factor.

Some disclosed examples involve receiving ultrasonic receiver signals from an ultrasonic receiver system corresponding to ultrasonic waves generated by a target object responsive to light from a light source system, estimating one or more blood vessel features based, at least in part, on the ultrasonic receiver signals and estimating blood pressure based, at least in part, on the one or more blood vessel features. Some disclosed examples involve receiving inertial sensor data from an inertial sensor system, determining whether the inertial sensor data indicates apparatus motion that exceeds a threshold and controlling a photoacoustic plethysmography (PAPG) system that includes the light source system and the ultrasonic receiver system according to whether the apparatus motion exceeds the threshold.

The invention relates to the field of integrated circuit design, in particular to a burst mode trans-impedance amplifier circuit for a 50G PON (Passive Optical Network), which comprises a high-frequency signal main circuit and a quick response auxiliary circuit, and the high-frequency signal main circuit realizes high-sensitivity amplification of low-optical-power signals and low-gain amplification of high-optical-power signals through the variable-gain transimpedance-stage amplification circuit and the amplitude-limiting post-stage amplification circuit. The quick response auxiliary circuit realizes ordered quick gain control and quick direct current bias elimination through a quick average value detection circuit controlled by different reset signals generated by the two circuits, and realizes quick response to burst signals together with the high-frequency signal main circuit. The device has the characteristics of high bandwidth, quick response and the like, can stably convert and amplify 50Gbps burst signals, and is suitable for a 50G PON uplink burst mode optical receiver system.

The invention relates to the field of land-based long wave time service and navigation, in particular to an eLoran receiver system delay calibration method and system based on multipoint ASF measurement. Establishing a reference point in the calibration area, and performing continuous monitoring on the reference point by using an ASF monitoring system to obtain an ASF time component of the reference point; selecting a plurality of measurement points in the calibration area, acquiring an ASF measured value of each measurement point by using the reference receiver, and performing space-time separation on the ASF measured value of each measurement point based on the ASF time component of the reference point to obtain an ASF spatial component of each measurement point; constructing a joint inversion model taking the system delay and the propagation path segmented earth conductivity as targets, and solving through an optimization algorithm to obtain the system delay of the reference receiver; determining an ASF spatial reference value of the fixed calibration point; and placing the to-be-calibrated receiver at the fixed calibration point for ASF measurement, and calculating the system delay of the to-be-calibrated receiver. According to the method, the influence of the system delay on the ASF measurement result can be effectively eliminated on the whole.

The subject matter of this specification may be embodied in, among other things, a position sensor system comprising a fluid effector including a housing having an inner surface defining a cavity, a movable body having a first surface and a second surface opposite to the first surface and configured to contact the inner surface and subdivide the cavity to define a first chamber and a second chamber, an acoustic transmitter system configured to transmit a first transmitted waveform toward the first surface and a second transmitted waveform toward the second surface, and an acoustic receiver system configured to detect a first reflected waveform based on a first reflection of the first transmitted waveform, the first reflection of the first transmitted waveform being based on the movable body, and to detect a second reflected waveform based on a second reflection of the second transmitted waveform, the second reflection of the second transmitted waveform being based on the movable body.

An apparatus and associated method may include a light source system including a light emitting component; and a receiver system configured to detect an acoustic wave corresponding to a photoacoustic response of a blood vessel to light emitted by the light source system. The control system may be configured to determine a wave characteristic from the acoustic wave and estimate a tension state classification based on the determined wave characteristic. The tension state classification may be one of a plurality of tension state classifications that each include a different range of relaxation and contraction values.

Systems and methods for providing a dynamic delay factor for using a remote control. A plurality of remote-control button presses are received by from a user. At least one button press time associated with the plurality of remote-control button presses is determined. A delay factor is generated for the user based on the at least one button press time. And at least one content receiver event, such as a wait time for a next button press or a length of time to display a menu, is employed based on the generated delay factor.

The invention discloses a 20 GHz large dynamic range logarithmic detector, and belongs to the field of broadband detectors. The 20GHz large dynamic range logarithmic detector comprises a limiting amplifier module, a rectifier module and an adder module. Wherein the limiting amplifier module is used for carrying out limiting amplification on an input signal; the rectifier module is used for converting an input signal of the limiting amplifier module into a detection current; and the adder module is used for gathering the detection current of the plurality of rectifier modules to a resistor and converting the detection current into voltage output. According to the invention, the wide-frequency-range input and large-dynamic-range output functions are realized, the wider signal transmission rate can be covered, the larger signal power range can be covered, and the strict requirements of high-integration-level, high-precision, high-sensitivity and large-dynamic-range receivers and other systems on the performance of the detector can be met.

This invention relates to a photonic Nyquist folding receiver system based on polarization multiplexing, comprising: N The first laser and optoelectronic modulator, the second i The laser generates continuous light that enters the first... i Photoelectric modulator, number i The RF input port of the upper arm of the optoelectronic modulator is connected to a carrier signal, the first i The RF input port of the lower arm of the optoelectronic modulator is connected to a binary symbol sequence; N The output optical signals of the photoelectric modulators are coupled and input to two Mach-Zehnder modulators. These two modulators are then connected to the signal under test (SUT) and the SUT processed by a delay circuit, respectively. One output optical signal passes through a polarization rotator and becomes orthogonal to the polarization state of the other optical signal. The two signals are coupled by a polarization beam combiner to output an orthogonally polarized multiplexed optical signal. This signal is then separated by a polarization beam splitter, and the two orthogonally polarized signals are fed into two photodetectors and two low-pass filters for low-pass filtering. Finally, the original frequency of the SUT is obtained by analyzing the frequency and phase difference of the two low-frequency signals. This invention can accurately recover the frequency of the SUT with low structural complexity.

The invention discloses a high-speed low-power-consumption two-step echo cancellation circuit based on a shared delay chain, and belongs to the technical field of high-speed serial interfaces. The circuit comprises a central shared coarse tuning delay chain, a plurality of tap modules sharing the delay chain, a weighting unit and a summing unit, the tap module comprises a fine adjustment delay stage, and multiplexes a transmitter side multiphase clock signal to perform phase fine adjustment; the weighting unit weighs the delay signal replica, and the summing unit subtracts the delay signal replica from the received signal after superposition so as to eliminate the echo. The receiver system adopts a separated subtraction architecture, near-end echoes are eliminated in front of the input end of a continuous time linear equalizer, far-end echoes are eliminated behind the output end of the continuous time linear equalizer, and a digital control logic module is additionally arranged to realize closed-loop adaptive control. Through resource sharing and architecture optimization, the power consumption and the chip area are greatly reduced, wide-range and high-precision echo cancellation is realized, and the method is suitable for a data communication system with 112Gb / s and higher rate.

Photoacoustic devices and systems are disclosed. A user device can include a light source system comprising one or more light sources; a receiver system comprising one or more receivers configured to detect acoustic signals generated based on light signals from the one or more light sources; an interface layer contactable by a user, the interface layer comprising a flexible material configured to conform to at least a portion of the user and adjacent to the one or more receivers, the interface layer having both a first acoustic property corresponding to an acoustic property of the user and a second acoustic property corresponding to an acoustic property of the one or more receivers; and a waveguide system comprising one or more waveguides at least partially embedded in the interface layer and configured to transmit the light signals from the one or more light sources to at least the portion of the user.

The invention relates to a receiver system. There is provided a system comprising a plurality of receivers, each receiver comprising a local oscillator configured to generate a local oscillation signal; a primary mixer configured to mix an input signal with a reference signal at a reference frequency to generate a first output signal; a frequency divider configured to divide the reference signal into a second reference signal at a second frequency; and a secondary mixer coupled to the primary mixer and configured to mix the first output signal with a second reference signal at a second frequency. In the first mode, a reference signal of a first receiver in the plurality of receivers is a local oscillation signal from the first receiver; in the second mode, the reference signal is a local oscillation signal from another receiver of the plurality of receivers.

Systems and methods for performing automatic frequency control are provided. Instead of relying on individual frequency tuners for each channel of a multi-channel receiver system, the present subject matter uses a single frequency tuner for receiving each channel of the multi-channel receiver system. A locked demodulator may be designated as a reference demodulator and frequency offset values associated with the reference demodulator may be applied to other demodulators of the multi-channel receiver. These frequency offset values may be used by individual demodulators of each channel for correcting corresponding frequency offsets.

The technology disclosed herein enables a distributed OTHR receiver system for more efficient, resilient, and scalable OTHR deployments. In a particular example, a receiver system includes a plurality of input channels configured to receive analog signals from a plurality of antennas and a plurality of analog-to-digital converters (ADCs) configured to generate digitized signals from the analog signals. The receiver system also includes an output interface configured to transmit the digitized signals to an external signal processor. The external signal processor is configured to receive additional digitized signals from one or more additional receiver systems contemporaneously with the digitized signals and package the digitized signals with the additional digitized signals for transmission.

The invention provides a Q-value-variable bisecond-order filter based on resistance feedback, and belongs to the technical field of radio frequency receivers. Differential source followers are adopted to form a second-order filtering unit, a cross coupling resistance network is introduced between differential signal nodes, and a novel method for adjusting the quality factor of the filter is provided. The quality factor Q of the filter can be independently adjusted through an equivalent feedback path formed by the cross coupling resistor in a differential working state. In addition, a parasitic zero offset method is provided, negative capacitance is achieved by cross-coupling two capacitors between differential input and output nodes, and the stop-band suppression performance is improved. On the premise that the power consumption of the filter is not increased, the variable Q value and high linearity are realized, and the structure is suitable for a radio frequency receiver system and has a good engineering application prospect.

According to the invention a radio frequency receiver system for an MRI apparatus is provided, comprising a receive coil, an amplifier, an analog-to-digital converter, a matching network and a noise calculation unit; the receive coil is attached to a patient, exhibiting a total effective coil impedance comprising a coil impedance and a patient impedance when attached to the patient; the amplifier exhibits a lowest noise impedance, connected to the receive coil to amplify a signal and output an amplified output signal; the analog-to-digital converter is connected to the amplifier to convert the amplified output signal into a digital signal for further processing; the matching network is interconnected between the receive coil and the amplifier, comprising an adjustable impedance matching system to match the total effective coil impedance to the lowest noise impedance; the noise calculation unit is connected to the analog-to-digital converter to receive a digital output signal of the analog-to-digital converter, adapted to calculate a noise of the output signal of the analog-to-digital converter, adapted to adjust the adjustable impedance of the matching network. This provides the possibility to individually calibrate the matching network for each patient before a scanning process.

Some disclosed devices include a light source system, an ultrasonic receiver system and a control system. The control system may be configured to receive first sensor signals, including ultrasonic receiver signals, from the ultrasonic receiver system and to estimate one or more blood vessel features based on the first sensor signals. The control system may be configured to receive second sensor signals from a second sensor and to estimate a PWV based on the first sensor signals and the second sensor signals. The control system may be configured to estimate blood pressure based, at least in part, on the one or more blood vessel features and the PWV.

The application discloses an air platform monitoring method and system for a ground terminal of an NGSO constellation system, and an air platform receiver system stays at a certain position in the air for a certain time, waits for a ground terminal signal to arrive beyond a threshold of the air platform receiver system, and determines whether a ground terminal exists in an antenna coverage area of the air platform receiver system. If no signal beyond the threshold exists, the air platform receiver system moves to a next area. If the signal beyond the threshold exists, the height of the air platform receiver system is reduced, and the air platform receiver system is searched again in the coverage area until the terminal is found.

A receiver system (1) for solar installations (100), comprising at least one first receiver (3) having a hollow chamber and having a first aperture (5), a high-temperature process being solar-thermally operable in the hollow chamber, and comprising at least one second receiver (7), which annularly surrounds the at least one first receiver (3), a heat-transfer medium being heatable by means of the at least one second receiver (7).

The invention discloses a superconducting filtering coupling amplification assembly applied to a deep space exploration receiver system. The superconducting filtering coupling amplification assembly comprises a box body; the box body is divided into a first cavity and a second cavity which are mutually independent through a partition plate; a superconducting filtering coupling circuit is mounted in the first cavity; a low-temperature low-noise amplifier circuit is mounted in the second cavity; the signal output end of the superconducting filtering coupling circuit is connected with the signal input end of the low-temperature low-noise amplifier circuit through a bridging gold wire; the superconducting filter coupling circuit comprises a superconducting filter and a superconducting coupler which are integrated on the same dielectric substrate; the low-temperature low-noise amplifier circuit comprises a low-temperature low-noise amplifier chip and an amplifier biasing circuit which are integrated on the same microwave substrate. According to the invention, high-frequency-selection suppression filtering and low-noise receiving amplification of received signals can be realized, a calibration signal injection function is realized, and the amplifier is suitable for various microwave circuits, and is especially suitable for application scenes with extreme noise control requirements, such as a deep space exploration receiver and the like.

Method for exchanging a message between a sender and a receiver using a neutrino-based communication channel, comprising the steps of: sender-side encoding of the message into a codeword using deterministic or stochastic post-Shannon coding (PSK), sender-side generation of a neutrino beam by: - ​​accelerating protons in a proton beam, - deflecting the proton beam onto a target to generate neutrinos through the decay of short-lived particles;Transmitter-side amplitude modulation of the neutrino beam by: - ​​Controlling the deflection of the proton beam using a controllable deflection system to direct the proton beam either onto the target or onto an absorber according to the bits of the PSK-encoded message, thereby encoding the PSK-encoded message as neutrino pulses, where: ∘ the absence of a neutrino pulse in a time slot represents a "0" bit and ∘ the emission of a neutrino pulse in a time slot represents a "1" bit or vice versa; transmission of the neutrino pulses from the transmitter to the receiver; synchronization of transmitter and receiver using a time synchronization unit that synchronizes the timing of the generated neutrino pulses with time windows of the receiver system;Receiving the neutrino pulses by a neutrino detector of the receiver, wherein: - decay products, in particular light signals, which are generated by the interaction of the neutrinos with a detector medium are detected and - the detected signals are stored as a bit sequence; decoding the received bit sequence, wherein a comparison is carried out between the expected and the received codeword in order to enable identification of the message.;

The invention provides a dynamic response calculation method and device for a rotor-bearing-casing system, and belongs to the field of aviation rotating mechanical structures. The method provided by the invention comprises the following steps: establishing a dynamic model of a rotor system; non-linear mechanical models of all the assemblies are established respectively, and a dynamic model of the supporting system is obtained through integration; integrating the dynamical model of the rotor system and the dynamical model of the supporting system to form a dynamical model of a rotor-supporting system; establishing a dynamical model of the cartridge receiver system, and setting a coupling point at the connection position of the cartridge receiver and the support; based on a data interaction and time step synchronization mechanism, mechanical quantity is transmitted between the dynamic model of the rotor-support system and the dynamic model of the casing system through the coupling point, combined time domain numerical integration solution is carried out, and the dynamic response of the whole machine system is obtained. According to the method and the device provided by the invention, the coupling dynamic response of the rotor-bearing-casing system can be efficiently and accurately calculated.

An apparatus may include a platen, a light source system configured to provide first light of a first wavelength and second light of a second wavelength to a target object on an outer surface of the platen, an ultrasonic receiver system, and a control system. The control system may be configured to cause the light source system to provide a first light to a target object at a first time and a second light to the target object at a second time; receiving a first ultrasonic receiver signal and a second ultrasonic receiver signal from the ultrasonic receiver system corresponding to a photoacoustic response of the target object to the first light and the second light, respectively; and estimating one or more vascular characteristics based on at least one of the first ultrasound receiver signal or the second ultrasound receiver signal.

A method for exchanging a cryptographic key between a sender and a receiver using a neutrino-based communication channel, comprising the steps of: Sender-side generation of a neutrino beam by: - ​​accelerating protons in a proton beam, - deflecting the proton beam onto a target to produce neutrinos through the decay of short-lived particles; Sender-side generation of a sequence of random bits representing the cryptographic key, and encoding of the random bits by: - ​​controlling the deflection of the proton beam by means of a controllable deflection system to direct the proton beam either onto the target or onto an absorber according to the random bits, thereby encoding the random bits as neutrino pulses; transmission of the neutrino pulses from the sender to the receiver;Synchronization of transmitter and receiver by means of a time synchronization unit that synchronizes the timing of the generated neutrino pulses with time windows of the receiver system; reception of the neutrino pulses by a neutrino detector of the receiver, wherein: - decay products, in particular light signals, which are generated during the interaction of the neutrinos with a detector medium are detected and - the detected signals are each assigned to a key bit; storage and concatenation of the received key bits to generate the cryptographic key, which is stored in a key storage module of the receiver.

An apparatus, including a monitor system which includes a microphone, a first power supply, and a transmitter which transmits a first audible sound, indicative of a normal flow of fluid into a tank, or transmits a second audible sound, indicative of a need to cease a flow of the fluid into the tank; an attachment device to which the monitor system or the microphone is attached and which is attached to a ventilation pipe or an object in a vicinity of the ventilation pipe; and a receiver system which includes a receiver, which receives the first audible sound or the second audible sound, a second power supply, and a speaker which provides a first audio output, indicative of the first audible sound, or a second audio output indicative of the second audible sound. The speaker outputs the first audio output or outputs the second audio output.

The invention relates to a ground-based navigation signal receiver system and method based on time-hopping pattern cooperative processing, and the method comprises the steps: a computer control module carries out parameter configuration and initial state setting, so as to provide support for subsequent signal capture and time-hopping pattern matching cooperation; executing signal search and time hopping pattern preliminary matching; after matching succeeds and a unique optimal matching bit is obtained, the receiver is switched into a traction and tracking stage guided by a time hopping pattern from a prior search state; and dynamically adjusting parameters and processing strategies according to a built-in self-adaptive processing mechanism, a time hopping pattern matching state and real-time signal quality. The time hopping pattern matching process is deeply embedded and cooperates with the navigation signal receiving process to construct an integrated processing architecture, so that the problems of processing link splitting and low resource utilization rate in the traditional scheme are effectively solved, the matching result is utilized to intelligently guide subsequent traction and tracking, the overall processing efficiency is greatly improved, and the method is suitable for large-scale popularization and application. And the first positioning time is shortened.