57 results about "Signal in space" patented technology

The dereverberation of signals in reverberating environments is carried out via acquiring the representation (image) of spatial distribution of the signals in space of interest and automatic identification of reflections of the source signal in the reverberative space. The technique relies on identification of prominent features at the image, as well as corresponding directions of propagation of signals manifested by the prominent features at the image, and computation of similarity metric between signals corresponding to the prominent features in the image. The time delays between the correlated signals (i.e., source signal and related reflections) are found and the signals are added coherently. Multiple beamformers operate on the source signal and corresponding reflections, enabling one to improve the signal-to-noise ratio in multi-path environments.

The present invention consists of a method to ensure the integrity of the navigation solution even when the user is in a non controlled environment as it is the case of urban and road applications. The method requires the existence of a Signal In Space with guaranteed integrity as the one today provided by SBAS systems or from GBAS, Galileo or GPS-III in the future. The invention covers the algorithms to detect and isolate errors present in non controlled environments such as multipath and compute resulting position error bounds with the required level of integrity. This invention substantially increases the field of application of satellite navigation systems with associated integrity to the so-called liability critical applications.

An instrument landing system (ILS) provides signals in space receivable by an aircraft in flight to identify, for example, a point in space at which to start an approach along a glide slope path to a touchdown point on a runway. Atmospheric, ground and other conditions may cause transmission anomalies, so that the ILS signals identify a point in space displaced from its intended position. Systems and methods employed in flight use GPS or other positional data to determine the current displacement of such point, as identified by received ILS signals, from its intended position consistent with ILS specifications. In addition to reception and use of ILS and GPS signals, data on geographic runway location and correct ILS signal in space parameters is used for reference purposes in determining signal in space position discrepancies, glide slope path angular discrepancies, or both. The pilot can be alerted not to rely upon the ILS when discrepancies, which can vary on a short time basis and not be discernable from the ground, are determined to exceed safe limits.

A geometric processing stage for a pipelined engine for processing video signals and generating processed video signal in space coordinates (S) adapted for display on a screen. The geometric processing stage includes: a model view module for generating projection coordinates of primitives of the video signals in a view space, said primitives including visible and non-visible primitives, a back face culling module arranged downstream of the model view module for at least partially eliminating the non visible primitives, a projection transform module for transforming the coordinates of the video signals from view space coordinates into normalized projection coordinates (P), and a perspective divide module for transforming the coordinates of the video signals from normalized projection (P) coordinates into screen space coordinates (S). The back face culling module is arranged downstream the projection transform module and operates on normalized projection (P) coordinates of said primitives. The perspective divide module is arranged downstream the back face culling module for transforming the coordinates of the video signals from normalized projection (P) coordinates into screen space coordinates (S). A circuit in the back face culling module can be shared with a standard three dimension back face culling operation when necessary. An application is in graphic engines using standard graphics language like OpenGL and NokiaGL.

The invention relates to the technical field of medical instruments, and aims to provide a novel combined brain-computer interface normal form, which solves the technical difficult problem that two kinds of brain electrical signals are simultaneously evoked, separates the brain electrical signals in space and frequency domain and analyzes the signal features of the SSVEP and P300 so as to achieve the purpose of target identification. In order to achieve the purpose, the technical scheme adopted by the invention is that a combined brain-computer interface method based on the SSVEP and the P300 comprises the following steps: the SSVEP is evoked through line fixed frequency blinking, and the P300 is evoked through row color-frame highlighting; certain pre-processing is performed on the collected brain electrical signals, namely the SSVEP and P300; the lines in which the target characters are positioned are identified through analyzing the frequency features of the collected brain electrical signal SSVEP; the features of the P300 of the brain electrical signals are analyzed, the rows in which the target characters are positioned are identified. The combined brain-computer interface method and the combined brain-computer interface device are mainly applied to the brain-computer interface.

The different advantageous embodiments provide a system for network communication testing comprising a communication effects server, a number of radio emulators, a number of radios, and a wireless link simulator. The communication effects computer is configured to provide a number of communication network effects. The number of radio emulators have a number of Ethernet signal-in-space emulators configured to output a number of Ethernet packets to the communication effects server. The number of radios is configured to transmit and receive messages over a radio frequency. The wireless link simulator is configured to provide simulated distance between the number of radios using real-time changes in a simulation running on a number of platforms.

The invention discloses a digital beam forming method for a multi-carrier broadband signal. On the basis of a multi-phase processing technology, a sub-carrier DDS is designed in an FPGA; double accumulators and a register generate a P4 complementary code encoding phase in a delay manner; a compensation phase and a time delay are calculated according to a serial number of a sub carrier radio-frequency signal transmitting antenna unit; a phase code and a sub carrier baseband signal after phase compensation are generated based on a CORDIC algorithm by using the accumulator; digital delay, digitalup-conversion, digital-to-analog conversion, and intermediate-frequency filtering are carried out to output an analog subcarrier intermediate-frequency signal; a frequency-agility local-oscillator signal is generated by using an externally inputted reference clock signal, mixing and filtering are carried out on all sub carrier intermediate-frequency signals and the frequency-agility local-oscillator signal to generate sub carrier radio-frequency signals, power amplification is carried out and the processed signals are transmitted by antenna units; and the sub carrier radio-frequency signals transmitted by all antenna units are synthesized into a multi-carrier broadband signal in space. According to the invention, with phase control and continuously variable digital delay control, digitalbeam forming of the multi-carrier signal is realized.

This invention relates to a method for obtaining full mark collect gain based on the diagnal hierarchy empty time structure, which first of all applies a set of optimum random basic matrixes to modulate the transmit packets on space in every symbol period in the V-BLAST structure then to transmit signals in space domain along the diagonal direction in time domain. The transmission form can get full mark collect gain at the same time when not losing the spectrum usability of the V-BLAST structure to realize double optimization of spectrum usability and performance. Besides, FD-DLST structure can be tested by the continuous forced zero and offset algorithm.

In a method for providing integrity information for users of a global navigation system, which comprises several space vehicles like satellites transmitting information to a device for position detection, the transmitted information comprises first information from the global navigation system about the accuracy of a signal in space error SISE of a faulty space vehicle, and second information whether or not the global navigation system assesses the faulty space vehicle as faulty. The invention is based on the assumption how exact a fault can be detected, so that performance the global navigation system can be increased; and no unfounded assumption is used which improves the quality of service.

The invention relates to resolving for a signal in space error (SISE). An SISE estimation value for reflecting a synthetic error of the signal in space in real time is acquired by processing data such as track and clock correction and the like in real time and integrating multiple error factors into an SISE final result by adopting the Overbound mathematical principle. The invention also relates to precision analysis of intermediate data and result data in SISE resolving. Besides, the invention also relates to verification for the signal in space error. By applying SISE at different moments to a positioning calculation and comparing the positioning calculation result with a known precise result in a positioning domain, if the positioning accuracy modified by the SISE is obviously higher than the positioning accuracy before being modified, the calculation for SISE parameters is true and valid.

The invention, which belongs to the field of array signal processing parameter estimation, particularly relates to a uniform-circular-array-based coherent signal parameter estimation method in an impact noise environment. The method comprises the following steps that: step one, snapshot sampling is carried out on D source signals in space; step two, de-impact preprocessing is carried out on the snapshot sampling data; step three, mode excitation transformation is carried out on array output data; step four, a sparsely reconstructed dictionary set is constructed; step five, sparse reconstruction is carried out to obtain a coherent signal source azimuth; step six, whether a maximum iteration number is reached is determined; if so, a step seven is performed; and if not, t is enabled to be equal to the sum of t and 1 and the step five is preformed again; and step seven, a sparse reconstruction result is obtained, source azimuth information is obtained by an index set U, and a coherent source direction-of-arrival estimation result is outputted. Therefore, a uniform-circular-array-based coherent signal parameter estimation problem in an impact noise environment is solved and the mode excitation transformation and compressed sensing sparse reconstruction ideas are used as parameter estimation bases. The designed method has advantages of low computational complexity, short calculationtime and high robustness.

The invention relates to a uniform circular array azimuth super-resolution estimation method, which belongs to the technical field of spatial spectrum estimation. Target signals firstly have shift-invariant property in targeting; a method of using rotation invariance to estimate signal parameters is then used to acquire multiple parameters carrying target position information; and finally, a new spatial spectrum is defined by using the parameters, and the target azimuth estimation is acquired through searching the position of a spectral peak. The uniform circular array-based super-resolution spatial spectrum estimation can be acquired, the resolution is better than that in a wildly-used multiple signal classification spatial spectrum estimation method, and the method can be used for positioning and estimation of multiple adjacent signals in space.

In a method for providing integrity information for users of a global navigation system, which comprises several space vehicles like satellites transmitting information to a device for position detection, the transmitted information comprises first information from the global navigation system about the accuracy of a signal in space error SISE of a faulty space vehicle, and second information whether or not the global navigation system assesses the faulty space vehicle as faulty. The invention is based on the assumption how exact a fault can be detected, so that performance the global navigation system can be increased; and no unfounded assumption is used which improves the quality of service.

The invention relates to an electric field sensor for measuring electromagnetic pulses. The electric field sensor is characterized by comprising a D-dot antenna, the D-dot antenna is successively connected with an active integrating circuit and an electric-to-optical conversion circuit so as to convert differential signals output by the antenna into original electric field signals after electric field signals in space are received and finally modulate the original electric field signals into optical signals for transmission through fibers. According to the electric field sensor for measuring the electromagnetic pulses, the electric field signals are received by use of the D-dot differential antenna, and the active integrating circuit is developed for processing the output signals of the antenna, such that the response bandwidth and the sensitivity of the sensor are improved. The antenna and a sensor main body are mounted and dismounted through threads, so that the sensitivity of the electric field sensor can be adjusted through adjusting the length of the antenna, and carrying and transportation are facilitated.

A geometric processing stage for a pipelined engine for processing video signals and generating processed video signal in space coordinates (S) adapted for display on a screen. The geometric processing stage includes: a model view module for generating projection coordinates of primitives of the video signals in a view space, said primitives including visible and non-visible primitives, a back face culling module arranged downstream of the model view module for at least partially eliminating the non visible primitives, a projection transform module for transforming the coordinates of the video signals from view space coordinates into normalized projection coordinates (P), and a perspective divide module for transforming the coordinates of the video signals from normalized projection (P) coordinates into screen space coordinates (S). The back face culling module is arranged downstream the projection transform module and operates on normalized projection (P) coordinates of said primitives. The perspective divide module is arranged downstream the back face culling module for transforming the coordinates of the video signals from normalized projection (P) coordinates into screen space coordinates (S). A circuit in the back face culling module can be shared with a standard three dimension back face culling operation when necessary. An application is in graphic engines using standard graphics language like OpenGL and NokiaGL.

A silicon-base grated gate terahertz detector consists of a MOS transistor. The MOS transistor comprises a substrate layer. One end of the upper end surface of the substrate layer is provided with a source, and the other end of the upper end surface of the substrate layer is provided with a drain. A channel layer and an insulating layer are successively disposed from bottom to top on the upper endsurface of the substrate layer and between the source and the drain. The source and the drain are connected to the channel layer and the insulating layer. A gate of a grating structure is disposed onthe upper end surface of the insulating layer. The invention relates to the silicon-base grated gate terahertz detector. The grating structure is configured to couple a terahertz signal in space, anda gap of the grating structure is configured to diffract the terahertz signal, thereby increasing the local terahertz field strength. The gate of the NMOS / PMOS is prepared into the grating structureso as to effectively couple the terahertz signal in space to a transistor channel, and excite the plasma oscillation in the channel, thereby changing the current between the source and the drain, andrealizing the terahertz signal detection.

Method, computer program to implement method, storage medium to store the program and apparatus for computing Signal-in-Space Accuracy (SISA) parameters in a regional or Global Navigation Satellite System (GNSS). The method includes at least of: determining individual Signal-in-Space Error (SISE) vectors; mapping individual SISE vectors to a service area; accumulating empirical sample sets; processing density functions of estimations of accumulated sample sets; individually overbounding density functions in one of an overbounding sense related to the regional or GNSS or in a paired overbounding with excess mass sense; and selecting a worst case according to predefined requirements.

The invention belongs to the technical field of communication interference resistance, and particularly relates to a method for generating a transmitting signal in a space-frequency two-dimensional index modulation system. For the situation that no transmit diversity gain exists in a space-frequency two-dimensional index modulation system, the invention provides a transmitted signal pattern generation method based on subcarrier binding. Specifically, a space-frequency domain resource unit is defined; namely, the space-frequency resource of each subcarrier on each antenna is used as a basic unit; grouping is carried out on a frequency domain, then subcarriers on each antenna are bound to form virtual space-frequency resource blocks, part of the space-frequency resource blocks are activatedduring each transmission, and the same amplitude modulation and phase modulation signal is mapped by the same virtual block, thereby obtaining a frequency domain signal, and further obtaining a transmission signal. According to the method, the transmit diversity gain of the system can be improved, and the overall transmit gain of the system can be flexibly configured.

Method, computer program to implement method, storage medium to store the program and apparatus for computing Signal-in-Space Accuracy (SISA) parameters in a regional or Global Navigation Satellite System (GNSS). The method includes at least of: determining individual Signal-in-Space Error (SISE) vectors; mapping individual SISE vectors to a service area; accumulating empirical sample sets; processing density functions of estimations of accumulated sample sets; individually overbounding density functions in one of an overbounding sense related to the regional or GNSS or in a paired overbounding with excess mass sense; and selecting a worst case according to predefined requirements.

The invention provides a biomimetic sensor for measuring mechanical signals and a manufacturing method of the biomimetic sensor. The biomimetic sensor comprises a sensor unit, a sensor bracket and a resistance detection device, wherein the sensor unit comprises a flexible substrate layer, a hair rod and a signal processing layer; the hair rod and the signal processing layer are arranged on the flexible substrate layer; the hair rod is in an inverted circular truncated cone shape; and cracks are formed in the signal processing layer. According to the biomimetic sensor disclosed by the invention, the hair rod in the inverted circular truncated cone shape has relatively large inertia; the cracks on the signal processing layer can be opened and closed along with deformation of the flexible substrate layer in the measurement process, and large resistance change can be obtained, so that the measurement sensitivity of the biomimetic sensor is improved, and the biomimetic sensor can be suitable for detecting weak mechanical signals. In addition, the biomimetic sensor can measure various mechanical signals in space and a plane at the same time, and the biomimetic sensor is high in adaptability to multiple signals in the space and the plane and high in integration degree.

The invention discloses a high-voltage electrostatic field generator with a fresh-keeping function and a refrigerator with a fresh-keeping function. The high-voltage electrostatic field generator withthe fresh-keeping function comprises an inverter circuit for inverting a safety DC voltage into high AC voltage with predetermined range for output; an oscillating circuit connected with the invertercircuit and used for generating a sinusoidal AC signal of certain frequency and amplitude and a vibrational signal in space; a plurality of high voltage electrodes connected with the oscillating circuit and used for generating ozone by supplying low-frequency vibration; a stepdown filter device connected with the inverter circuit and used for stepping down and filtering the AC voltage that is boosted. The safety DC voltage, such as 12 V, is inverted into the AC voltage of 1000-5000 V through the inverter circuit; the input safety DC voltage, such as 12 V, is low, providing good safety and reliability; the power consumption is lower, so that energy saving and electricity saving are achieved; the efficiency of high-frequency boost conversion for direct current is high, and conversion startup speed is high.

The invention discloses an automatic modulation recognition method based on an attention mechanism and multi-feature fusion, and the method comprises the steps: inputting three streams of signals into a network, extracting spatial features and time sequence features through a CNN and an LSTM, carrying out the fine adjustment of a feature vector through the attention mechanism and Gaussian noise, and finally achieving the modulation classification through a full connection layer. The method comprises the steps of performing signal preprocessing on data of a public data set; constructing an automatic modulation recognition network based on an attention mechanism and multi-feature fusion; iQ data is collected in real time and sent to a network identification modulation mode after data preprocessing. According to the method, complementarity between different networks and various features reflected by different signal representation are fully considered, related features of signals in space and time are extracted by using a combined structure of the CNN and the LSTM, the modulation identification precision is improved, and the method can be well applied to a non-cooperative communication system.

A radar and method for making a radar undetectable, comprising comprises: on a transmit antenna consisting of N individual subarrays that are non-directional in at least one plane in transmission, each being linked to a waveform generator, generating, for each of the individual subarrays, a waveform so as to make each of the individual subarrays transmit continuous or quasi-continuous signals according to a temporal and periodic pattern by using transmission patterns made up of N different subarrays and which are deduced from one another by an individual delay, on the receive antenna comprising M individual subarrays adapted to pick up the reflected signals obtained from the transmission of the N individual subarrays of the transmit antenna, performing a compression of the received signal in space and in time of the received signals.

The dereverberation of signals in reverberating environments is carried out via acquiring the representation (image) of spatial distribution of the signals in space of interest and automatic identification of reflections of the source signal in the reverberative space. The technique relies on identification of prominent features at the image, as well as corresponding directions of propagation of signals manifested by the prominent features at the image, and computation of similarity metric between signals corresponding to the prominent features in the image. The time delays between the correlated signals (i.e., source signal and related reflections) are found and the signals are added coherently. Multiple beamformers operate on the source signal and corresponding reflections, enabling one to improve the signal-to-noise ratio in multi-path environments.

A method for filtering noises in an optical parametric chirped-pulse amplifier by a spatial-chirp-dressed seed beam is provided. The various noises that grow during amplification course, including parametric super-fluorescence, pump distortion-induced noise and surface-reflection-initiated pre-pulses, will not have the spatial and temporal chirp. After dechirping amplified signal with a compressor, a main pulse having its spatial and temporal chirp removed completely is produced, while the noises acquire an additional spatiotemporal coupling, making themselves highly distinguishable from signal in space, and hence supporting noise filtering effectively and expediently in spatial domain that would not be possible otherwise. The method has capabilities of an order of magnitude reduction in noise energy and several orders of magnitude enhancement in temporal contrast.

The invention discloses sending end equipment and a signal processing method, relates to the technical field of communication, and is used for providing an effective pre-distortion architecture. The sending end equipment comprises m sending antenna groups, a target feedback antenna and a processor. The m sending antenna groups and the target feedback antenna are respectively connected with the processor; the m sending antenna groups are used for sending m training signals under the control of the processor; the target feedback antenna is used for receiving a first mixed signal obtained by superposing the m training signals in space under the control of the processor; the phase difference between the phase of the first mixed signal and a second mixed signal obtained by superposing m training signals received by the receiving end equipment in space is within a preset range; the processor is used for carrying out DPD parameter estimation according to the first mixed signal to obtain a DPDparameter, and carrying out pre-distortion processing on the signal to be sent according to the DPD parameter; and the m sending antenna groups are also used for sending the pre-distorted signals tobe sent under the control of the processor.

The invention relates to a capacitor partial discharge coupling and denoising sensor. The sensor comprises two balancing windings, wherein the two balancing windings are symmetrically and crosswise arranged and wound on a magnetic core; one end of each of the two balancing windings are connected with a connecting terminal a and a connecting terminal b respectively, and the other end of each of the two balancing windings are jointly connected with a connecting terminal c; a detection winding is wound on the middle part of the magnetic core and an output terminal is connected onto the detection winding. Since the technical scheme is implemented, a special coupling and denoising circuit is adopted, and the principle that the polarities of the windings are reverse and the magnetic fluxes are cancelled out is utilized. Interference signals in space and on the circuit can be eliminated through the coupling circuit; the output final signal is a partial discharge signal in the capacitor, so that the insulation level of a power capacitor can be accurately monitored in real time.

The invention discloses a noise reduction headphone. The noise reduction headphone comprises sound production units, pickup microphones, an audio divider and a noise reduction unit; the sound production units are used for playing audios; the pickup microphones are used for picking up noise audio signals in spaces, which the sound production units belong to; the audio divider is used for dividing input signals provided by the pickup microphones into two channels of signals; the noise reduction unit is used for generating noise reduction audio signals; the pickup microphones are positioned at one sides of the sound production units; the pickup microphones, the audio divider and the noise reduction unit are electrically connected in sequence; and the noise reduction unit is electrically connected to the sound production units. The invention further discloses a method using the headphone. The audio divider receives the input signals provided by the pickup microphones, and divides the inputsignals into two channels of signals to output; an external audio unit receives output signals of the audio divider, and obtains noise parameters; the external audio unit receives user requirements,performs noise parameter analysis, obtains noise reduction parameters, and outputs the noise reduction parameters to the noise reduction unit; and the noise reduction unit receives the output signalsin the audio divider and the output signals of the external audio units, generates noise reduction audios according to the noise reduction parameters, and then, outputs the noise reduction audios to the sound production units.

The invention discloses a method for simplifying signal processing of an MIMO receiver. The method includes steps of 1, a sending terminal of a UE side sends a detection frame, a NB side receives the detection frame and performs channel estimation and obtains a channel estimation matrix; 2, after the NB side obtains the channel estimation matrix, according to a receiving channel-sending channel reciprocity principle, simple conversion can be performed on the channel matrix and pre-coding treatment can be performed at the sending terminal; 3, after pre-coding treatment, the NB sending terminal signals goes to a receiving antenna of the UE through a wireless channel, namely, the signals received by the receiving terminal passes an all-through channel, multiple paths of one signal are converged to one antenna port in the same moment, so that an aim of suppression of multiple paths and signal energy convergence are achieved. According to the invention, through receiving-sending reciprocity and channel pre-coding treatment, multi-path effect is suppressed. The signals received by the receiving antenna are the gathering of original signals in space and time, so that extreme simplification of signal processing of the receiver is realized.