84 results about "Phase Code" patented technology

The invention relates to the technical field of ultra-far offshore data transmission, and discloses an ultra-far offshore distance real-time data stable transmission method and system. The method comprises the following steps: acquiring target transmission link data, and extracting dynamic fluctuation characteristics containing signal strength distribution information and a delay jitter relationship from the target transmission link data; calling the trained channel estimation network to carry out signal positioning processing on transmission link data, and generating a signal transmission path set containing a channel type identifier and phase code mapping relation; based on the set, calling a waveform analysis network to perform multi-modal feature fusion on the signal intensity distribution information to obtain a fusion result containing time-frequency domain features and modulation mode features; and inputting a fusion result into a transmission strategy model to perform dynamic path selection, and outputting a real-time data transmission element containing a control instruction generated based on a signal transmission sequence and a phase self-calibration parameter. According to the method, stable transmission of real-time data under the ultra-far offshore distance can be realized.

The embodiment of the invention provides a phase calibration method, a phase calibration device and a storage medium, the phase calibration method is used for obtaining a phase step and a phase code table used for phase calibration of a phase shifter, and the phase calibration method comprises the following steps: presetting a first phase code table which comprises a plurality of phase codes, traversing a preset phase step combination by using the first phase code table to perform phase calibration, transmitting a preset waveform signal by using a calibrated phase code, judging whether the performance index of the preset waveform signal accords with a performance index threshold value or not, and taking the phase step combination of which the performance index accords with the performance index threshold value as an optimal phase step; and performing phase calibration on a plurality of groups of transmitting antennas by adopting the preferred phase step and one or more second phase code tables, and obtaining a third phase code table by taking part or all of phase codes obtained after the phase calibration of the plurality of groups of transmitting antennas. The optimal phase stepping is obtained by combining the waveform performance indexes, so that the transmitted waveform is closer to the expected waveform, and better calibration precision is obtained.

To provide mechanisms for providing a source for circular-ranging OCT at moderate speeds.SOLUTION: A source for providing electromagnetic radiation within a particular spectral range includes: a ring-shaped optical resonator for circulating a plurality of wavelength bands including a first optical phase modulator, a first chromatic dispersion device, a second optical phase modulator, a multi-line spectral domain filter, a second chromatic dispersion device, and an optical amplifier; and a controller coupled to the first optical phase modulator and the second optical phase modulator, the controller being configured to drive the first optical phase modulator with a first waveform and the second optical phase modulator with a second waveform.SELECTED DRAWING: Figure 2

The invention discloses a motor state detection method, device and equipment based on coding and a medium, and belongs to the technical field of manipulators. The method comprises the following steps: receiving an electric pulse signal in real time; wherein the electric pulse signal is obtained by converting an optical signal passing through the light shielding plate; generating a detection code according to the electric pulse signal; determining a target phase according to the detection code and a pre-constructed association relationship between a phase code and a motor phase; wherein the number of the phase codes is at least two; and determining the running state of the motor according to the target phase. According to the technical scheme, the motor phase information is converted into the phase codes capable of being accurately recognized, the signal distortion situation caused by mechanical vibration, oil stain shielding and other factors can be effectively resisted, higher detection precision, higher anti-interference capacity and more flexible expansibility are achieved, and reliable guarantee is provided for intelligent and accurate operation of the mechanical arm.

The invention discloses a metasurface control architecture design method. According to the method, high and low voltages of each row unit and each column unit of the metasurface array are coded, phase codes of the metasurface array are obtained through a matrix multiplication method, and the control architecture method is called a basic cross control method or a one-area cross control method. Furthermore, according to the method, the metasurface array is divided into a plurality of areas of the basic cross control architecture, so that a multi-area cross control architecture is formed; according to the multi-zone cross control, the number and the zone positions of the zones can be flexibly changed according to the requirements of an actual application scene, so that the pointing precision of a wave beam is regulated and controlled, and meanwhile, the achievable complexity of metasurface control hardware is reduced. According to the invention, on the premise of keeping the specified beam regulation and control precision, the complexity of a metasurface control architecture and the memory occupied space of coding can be obviously reduced, and the application development of the low-cost and high-performance reconfigurable metasurface is promoted.

This invention provides a phase code digital low-pass filter circuit and a re-timer based on a PI-based architecture. The phase code digital low-pass filter circuit includes a first accumulation unit and a downsampling decimation module. The first accumulation unit accumulates the initial frequency control information generated by the clock data recovery module of the re-timer to generate a phase signal. The downsampling decimation module downsamples the phase signal to generate a filtered phase code. The filtered phase code is used to generate the transmit channel clock. This invention effectively solves the problems of high implementation cost, large footprint, and easy introduction of additional analog non-ideal factors in existing digital filtering solutions.

The application provides a remote acoustic signal pickup method and system based on phase coding microwave sensing, comprising: constructing a phase coding matrix, and performing phase shift control on the transmission signals of multiple transmission antennas; controlling the multiple transmission antennas to simultaneously transmit a linear frequency modulation continuous wave signal, so that the main lobe of a synthesized beam is directed towards the direction of a to-be-detected acoustic source or the direction of a target medium; using one or more receiving antennas to receive echo signals of the acoustic source target, to obtain a corresponding number of baseband signals; performing acoustic vibration phase demodulation on the corresponding number of baseband signals, to extract vibration information of the surface of the medium target caused by the vibration information of the acoustic source or caused by the excitation of the acoustic wave; and reconstructing the acoustic signal, to realize remote acoustic pickup. The application overcomes the problems of weak echo signals, low signal-to-noise ratio, large adjacent target interference and low quality of reconstructed acoustic signals in remote acoustic pickup, and improves the signal-to-noise ratio and sensing distance of remote acoustic pickup.

Disclosed are techniques for wireless sensing. In an aspect, a sensing node receives, from a sensing entity, a. configuration to report interference measurements, obtains, at a first time, one or more sensing measurements of one or more first sensing reference signals transmitted by a transmitter sensing node, obtains, at the first time, one or more interference measurements of one or more second sensing reference signals transmitted by one or more aggressor sensing nodes, and transmits, to the sensing entity, an interference measurement report including at least the one or more interference measurements.

Solutions for evaluating source code generators use offline and online evaluation stages. Offline evaluation includes separating each of a plurality of input passages of software code into a plurality of constituent blocks. Each code generator (of a plurality of code generators) generates an equivalent block corresponding to each constituent block. A coding score is determined for each equivalent block (for each code generator), and the coding scores are aggregated across the equivalent blocks to provide an aggregate score for each code generator. A ranking of the aggregate scores is used to down-select to a fewer number of code generators for online evaluation. For this stage, the code generators output passages of software code, and user acceptance of the code generators' outputs may be used for further ranking and down-selection. Some examples weight the coding score according to a code utility estimate of the constituent blocks for which equivalent blocks are generated.

The present invention discloses a method for designing discrete constant modulus quadrature phase coding for multiple targets. The method comprises the following steps: S1: determining the number of waveform signals M and the number of code elements N of each waveform of a multi-input multi-output radar, and randomly generating training samples of a size of M×N; S2: calculating the distance of a range gate and the waveform correlation function, and setting a loss function based on the distance and correlation function; S3: inputting the training samples into an established phase coding network for training, performing modulo-1 and discretization processing on the network output to obtain discrete constant modulus phase coding; S4: calculating the coding loss value based on the loss function, and updating the network parameters based on the loss value; S5: proceeding to S6 upon completion of training, otherwise returning to S3; S6: obtaining a trained network, inputting the data to be coded into the trained network, and obtaining a discrete constant modulus quadrature phase coded signal. This method enables the multi-input multi-output radar to operate normally in multi-target scenarios, and the output is a discrete code, which is more suitable for practical applications.

Systems and techniques for wireless communication are disclosed. For example, a network device may transmit a sensing signal for sensing one or more targets. The transmitted sensing signal and at least one sensing signal transmitted by at least one other network device of the plurality of network devices include one or more phase codes and a same frequency modulated carrier (FMCW). Each phase code of each sensing signal corresponds to one or more Doppler spectrum patterns. A network device may receive at least one echo signal from one or more targets. The network device may mitigate Doppler ambiguity in the Doppler spectrum from the at least one echo signal based on the one or more Doppler spectrum patterns.

The invention discloses a composite modulation signal blind identification method based on time-frequency analysis, which comprises the following steps of: firstly, judging and classifying input pulse signals, and then respectively carrying out identification and parameter estimation on determined signal types. According to the scheme, down-conversion analysis processing, signal time-frequency analysis processing and signal classification identification decision processing are firstly carried out on AD sampling intermediate frequency data sent by a digital signal processing board FPGA to obtain an identification result of a radar signal intra-pulse modulation type, and then corresponding parameter estimation is carried out according to the radar signal intra-pulse modulation type. According to two composite modulation styles of frequency coding and linear frequency modulation combination and frequency coding and two-phase coding combination, on the basis of time-frequency parameter characteristics of various composite modulations, related characteristic parameters are accurately extracted, a modulation type identification process is constructed, and time-frequency analysis is performed on radar signals through fast Fourier transform and phase correlation, so that the identification accuracy of the radar signals is improved. And furthermore, intra-pulse parameter estimation is accurately carried out on the radar signal.

The invention provides a photoelectric oscillator capable of being used for generating tunable phase coding microwave pulses. The photoelectric oscillator is composed of a tunable laser, a polarization controller, a phase modulator, a dual-drive Mach-Zehnder modulator, an optical circulator, a phase shift fiber bragg grating, a single-mode fiber, a photoelectric detector, an electric amplifier, a microwave source and an arbitrary waveform generator. The invention develops the active mode-locked photoelectric oscillator for generating the phase-coded microwave pulse signal, which is simple in structure and good in tunability. On the basis of an active mode-locked optoelectronic oscillator, a phase modulator is driven by a phase coding signal, so that the duration of each voltage polar code is kept consistent with the loop delay of the optoelectronic oscillator, and a phase-coded coherent microwave pulse sequence is generated. The signal has the advantage of large time bandwidth product, can give consideration to the detection distance and distance resolution of the radar, and has the characteristics of interference resistance, low interception and the like.

The invention discloses a microwave photon BPSK direction modulation signal generation device and method. The device comprises a laser LD, a double parallel Mach-Zehnder modulator DPMZM, a 90-degree bridge, phase modulators PM1 and PM2, a light beam splitter OS, a light beam combiner OC and a photoelectric detector PD. A laser signal generated by the laser PD passes through the light beam splitter and then is input into the double parallel Mach-Zehnder modulator DPMZM and the phase modulator PM1 at equal power. A local oscillator LO signal of the upper branch is divided into two paths after passing through a 90-degree bridge; in the lower branch, a pseudo-random binary signal PRBS generated by an arbitrary waveform generator AWG is input into a phase modulator PM1 to generate a phase coded signal; and finally, after beam combination of the upper branch and the lower branch, beat frequency is carried out through a photoelectric detector PD, so that direction modulation signals carrying different phase information are obtained. Compared with a traditional BPSK directional modulation scheme, the scheme provided by the invention can independently realize directional modulation of a plurality of frequency bands, the frequency can reach 40GHz, and the bandwidth can reach 4GHz.

The present invention discloses a method for identifying the current characteristics of a transformer substation area based on the correlation peak decision method, including: collecting the synchronous phase information of the power grid, generating and injecting a unique phase-coded characteristic signal; collecting the current signal at the key nodes of the transformer substation area and extracting the phase information; constructing a dynamic adaptive phase relationship network to extract the feature vectors with topological invariance; performing correlation analysis on the extracted feature vectors and the standard template, and determining the identification result through adaptive correlation peak decision; dynamically adjusting the system parameters according to the identification result. The method of the present invention combines phase coding with topological invariant features, and has the characteristics of strong anti-interference ability, good environmental adaptability and high recognition accuracy.

The invention relates to an intermittent sampling forwarding interference identification method, and belongs to the technical field of electronic countermeasures. The emission waveform design mainly comprises phase coding waveform identification code design, intra-pulse orthogonal waveform optimization and signal splicing; the receiving time-frequency processing mainly comprises pulse compression processing and time-frequency transformation analysis on echo signals. The intermittent sampling and forwarding interference identification method provided by the invention has the main advantages that the radar interference identification emission waveform based on the identification code has advanced interference identification performance, and at least two types of intermittent sampling and forwarding interference can be identified more accurately.

The invention discloses a complementary phase coding sequence signal processing method based on distance sidelobe shift and Doppler compensation, and relates to the technical field of radar signal processing, and the method comprises the steps: a radar transmitting signal employs a complementary coding sequence for phase modulation of a signal waveform; aD sampling, digital down-conversion and low-pass filtering are carried out on target echoes received by the radar, then the target echoes are rearranged into an echo signal matrix, and Doppler compensation is carried out on the echo signal matrix; and finally, pulse compression processing and moving target detection are performed on the compensated echo signal, target distance sidelobe moving is realized, and target distance-speed information is obtained. According to the complementary phase coding sequence signal processing method provided by the invention, the target distance sidelobe is effectively suppressed, the Doppler tolerance is improved, and an important technical support is provided for the complementary phase coding sequence signal in the field of low-altitude target detection.

The invention provides a quantum state coding device and method and a software-defined quantum communication system. The quantum state coding device comprises a polarization coding unit, a first optical coupling unit, a polarization-to-time phase coding unit, a first transmission optical path and a second optical coupling unit, the polarization coding unit is used for carrying out polarization beam splitting, polarization rotation and phase modulation on an input optical pulse and outputting an optical pulse in a polarization coding quantum state; and the polarization-to-time phase coding unit is used for converting the optical pulse of the polarization coding quantum state into an optical pulse of a time phase coding quantum state. And controlling the first optical coupling unit and the second optical coupling unit to output the optical pulse of the polarization coding quantum state or output the optical pulse of the time phase coding quantum state according to the quantum communication coding control instruction. According to the quantum state coding device and the quantum communication system, different coding requirements of the quantum communication system can be met by the same quantum state coding device.

The invention belongs to the technical field of metasurfaces and plane lenses, and particularly relates to a focusing metasurface lens with an anti-shielding function, the lens is composed of 40 * 40 units with the period of 7.5 mm, each unit comprises a top layer metal annular patch, a dielectric layer and a bottom layer metal patch, the relative dielectric constant of a dielectric substrate is 2.65, and the relative dielectric constant of the dielectric substrate is 2.65. The units realize anisotropic response through circumferential notch design, a stable 180-degree phase difference is formed by adopting a mirror image inversion structure, the 1-bit phase modulation requirement is met, the array performs phase coding in the radial direction according to an Airy function, and a hollow annular layout is adopted, so that the self-bending and self-repairing characteristics of Airy beams are effectively utilized, and the phase modulation efficiency is improved. The electromagnetic wave can bypass physical shielding of an axis area, field intensity reconstruction is realized at a set focus, and the design can remarkably improve focusing gain and energy recovery capability of a system in a shielding environment while maintaining high cross polarization conversion efficiency in Ku frequency band application of 13GHz and the like.

The invention provides a multi-channel complementary phase coding frequency modulation waveform design method, device and system, and the method comprises the steps: taking the overall response level of minimizing an interference signal and the sidelobe level of a target signal as an optimization criterion under an anti-SMSP application background, and considering the mutual interference problem between different channels, establishing a multi-channel complementary phase coding frequency modulation waveform optimization model capable of resisting SMSP interference; solving a coding vector gradient of a target function about a coding vector in the optimization model; calculating a search direction by using the coding vector gradient, iteratively updating the waveform coding vector until convergence, and outputting the optimized waveform coding vector; and solving a corresponding multi-channel complementary phase coding frequency modulation waveform with SMSP interference resistance by using the optimized waveform coding vector. The method is suitable for a multi-channel radar system, and the accumulation of target energy and the cancellation of interference energy are realized by designing a plurality of complementary waveforms, so that the SMSP interference resistance of the waveforms is improved.

The invention provides a phase coding QKD (Quantum Key Distribution) method, which comprises the following steps that: a transmitting end modulates an optical pulse into four optical pulses, a receiving end modulates each optical pulse into four optical pulses and forms six interference pulses, and a quantum key is negotiated and shared based on the six interference pulses; the invention also provides a phase coding QKD system, which comprises a transmitting end and a receiving end and is used for realizing the phase coding QKD method disclosed by the invention. According to the invention, the code rate and the security of the QKD system can be obviously improved, and the method has a good application prospect.

Techniques are disclosed for transmitting and receiving multiple encoded information bits on a radar signal. In one aspect, a transmitter radar generates a first set of phase - decoded modulated symbols to convey multiple encoded information bits, generates a second set of phase - decoded modulated symbols as reference symbols with known phase modulation, phase - decodes a plurality of chirps of the radar signal based on the first set of phase - decoded modulated symbols and the second set of phase - decoded modulated symbols, and transmits the plurality of chirps based on the phase - decoding. A receiver radar determines a phase difference between the receiver and the transmitter radar based on the phases of the plurality of chirps, equalizes the phase based on the determined phase difference, determines a phase code of the first set of symbols based on the equalized phase, and decodes the encoded information bits based on the phase code of the first set of symbols.

The application relates to the field of electronic communication technology and discloses an information modulation method and system for an LLC resonant converter. The application provides an information modulation method for an LLC resonant converter, which comprises the following steps: a power control loop module of the LLC resonant converter outputs a target frequency through a period conversion module; a digital signal to be transmitted is decomposed into a symbol sequence composed of a symbol A and a symbol B in a split-phase code mode; a frequency change lookup table module is established according to the target frequency, the target frequency is input, and a frequency change amount is correspondingly output; in the encoding mode of the split-phase code, a preset delay time is inserted when the symbols are switched, and actual delay time and phase shift angle are obtained according to the relationship between frequency jump and phase; and the digital signal is modulated into the LLC resonant converter through a PFM module.

The invention discloses a deception jamming method and device for an azimuth phase coding SAR (synthetic aperture radar), and belongs to the technical field of electronic support system synthetic aperture radar countermeasure. The method comprises the following steps: intercepting an SAR signal, carrying out two-dimensional structured phase stripping by constructing an inverse distance modulation operator and an inverse azimuth modulation operator, and estimating to obtain an azimuth phase sequence; carrying out complex domain differential operation on the estimated azimuth phase sequence, constructing a phase consistency measurement index and minimum consistency order mapping, and identifying a coding structure of the phase consistency measurement index and the minimum consistency order mapping; constructing a linear least square problem based on an identification result, and reconstructing an azimuth phase sequence; and performing phase consistent modulation including convolution modulation on the intercepted signal to generate a deception jamming signal. According to the method, complete matching of the interference signal and the SAR receiving filter is realized, and effective deception interference can be implemented on a new system SAR adopting random, primary, secondary and grouped phase coding.

The present application discloses a method, device, equipment and medium for detecting the state of a motor based on coding, and the present application belongs to the field of manipulator technology. The method includes: receiving an electric pulse signal in real time; wherein the electric pulse signal is obtained by converting the optical signal passing through the shading plate; generating a detection code according to the electric pulse signal; determining the target phase according to the correlation between the detection code and the pre-constructed phase code and the motor phase; wherein the number of the phase codes is at least two; and determining the operating state of the motor according to the target phase. This technical solution converts the motor phase information into a phase code that can be accurately identified, which can effectively resist signal distortion caused by factors such as mechanical vibration and oil obstruction, has higher detection accuracy, stronger anti-interference ability and more flexible scalability, and provides reliable protection for the intelligent and precise operation of the manipulator.

Provided is a method for solving radar ambiguity and occlusion based on an orthogonal two-phase coded signal. The method includes: generating and optimizing an orthogonal two-phase coded signal set by means of a walsh matrix and a genetic algorithm, and alternatively, obtaining an orthogonal two-phase coded signal set through an exhaustive method, depending on a chip length; determining the radar period and the number m of transmission pulses in a period according to the radar farthest detection range and the pulse repetition interval (PRI), and selecting m signals from the orthogonal two-phase coded signal set, to constitute a group of orthogonal two-phase coded pulse signals; and accumulating echoes of transmitted pulse signals, to generate an echo matrix, performing frequency domain pulse compression, to obtain a processed new matrix, and performing moving target detection on the matrix.

Aspects of the present disclosure are directed to systems and methods of operating a MIMO radar system for automotive applications, including transmitting FMCW signals from first and second transmitters; wherein the signals each comprise a plurality of chirps, and each signal comprises phase modulation of the FMCW signal within each chirp by a respective CDMA phase code to produce respective first and second PM-FMCW signals; receiving a composite signal, wherein the composite signal comprises at least one reflection of the first PM-FMCW signal and the second PM-FMCW signal; and in the digital domain, processing a plurality of down-converted and pre-processed groups of samples of the composite signal by: applying a frequency response correction; applying a group delay filter; the CDMA phase code is removed; the 2D-FFT is applied; and removing a phase code cross-correlation residual from the corresponding transformed demodulated sample group by calculating an estimated residual and subtracting the estimated residual from the corresponding transformed demodulated signal.

The utility model discloses a quantum key distribution system with switchable coding modes. The quantum key distribution system comprises a laser, a transmitting end coding module, a receiving end coding module and a detection module, the sending end coding module comprises a first circulator, a first optical path converter, a first phase coding module and a first polarization coding module; and the receiving end encoding module comprises a second circulator, a second optical path converter, a second phase encoding module and a second polarization encoding module. The utility model discloses a quantum key distribution system with switchable coding modes, two coding modes of phase coding and polarization coding respectively have anti-polarization disturbance capability and anti-phase disturbance capability, the coding mode can be preferentially selected according to main environmental factors influencing bit error rate, and high-stability and high-performance operation of the system is realized. Meanwhile, by multiplexing the laser and the detection module, the engineering development cost of the QKD system is reduced, and the QKD system has higher on-site deployment value.

The application discloses a complementary sequence phase coding intermittent transmitting and receiving echo reconstruction method, and steps are as follows: first, complementary sequence intermittent transmitting and receiving control signal design; second, phase coding intermittent transmitting and receiving processing; third, phase coding echo reconstruction and information reconstruction. The method uses the characteristics of the intermittent transmitting and receiving control signal, and respectively processes the phase coding intermittent transmitting and receiving, so that the operation is convenient and simple, the reconstruction precision is improved, and echo information loss caused by the intermittent transmitting and receiving processing is solved.

A semiconductor device includes a phase splitter configured to output a plurality of clock signals having different phases by using a plurality of external clock signals having different phases, a plurality of code generators configured to receive a pair of selection clock signals determined from the plurality of clock signals and to output a phase code corresponding to a phase difference error between the pair of selection clock signals, and a delay circuit configured to at least partly simultaneously adjust at least two of a rising edge and a falling edge of each of the plurality of external clock signals with reference to the phase code during a lock time.