1053 results about "Carrier phase" patented technology

Disclosed are systems, apparatuses, processes, and computer-readable media to determine a location of a device using carrier phase positioning. A process includes transmitting, at the device to a network entity, a phase measurement capability of a device (e.g., a user equipment (UE)) for subcarrier set pairs of different resources received by the device. The different resources are associated with a reference signal. The process can include receiving, at the device, a phase measurement request from a network entity for configuring phase measurements of the subcarrier set pairs of the different resources. The process can include transmitting a phase measurement report to the network entity based on the phase measurement request, the phase measurement report including information associated with a measured phase difference of at least one subcarrier set pair associated with the different resources.

The invention relates to the technical field of satellite navigation and anti-interference, and discloses an unmanned aerial vehicle dynamic navigation anti-interference method and system based on a single Beidou satellite, and the method comprises the steps: an unmanned aerial vehicle receives a navigation signal through the single Beidou satellite, and carries out the initialization; and performing interference enhancement detection through a multi-frequency domain joint filtering technology. And analyzing a carrier phase tracking spectrum, and carrying out autonomous integrity monitoring on the single Beidou satellite. Deception signals are isolated, navigation parameters are corrected, and the dynamic navigation anti-interference effect of the unmanned aerial vehicle is achieved. According to the method, a carrier phase tracking spectrum is analyzed through a multi-frequency-domain joint filtering technology, a disguise deception signal of a submerged loop is identified under the condition that no strong interference signal exists, and the authenticity of a navigation signal is ensured. In combination with IMU data and historical pseudo-range changes, through real-time comparison of navigation data and IMU calculation data, deception signals are isolated, navigation parameters of the unmanned aerial vehicle are corrected, and it is ensured that the unmanned aerial vehicle can continuously, stably and dynamically fly.

The invention relates to the technical field of inertial assistance, in particular to a Beidou high-precision space-time reference dynamic compensation system based on inertial assistance, which is characterized in that an inertial measurement unit module is used for measuring original measurement data, and the original measurement data comprises a carrier phase and a Doppler observation value; the processing unit module is used for fusing the inertial measurement unit, executing real-time environment perception and dynamic modeling, classifying an operation environment and predicting error characteristics; performing an adaptive robust fusion filtering algorithm that dynamically adjusts filter parameters and switches a filter model to estimate the position and attitude of the carrier; and in combination with radio wave precision single-point positioning enhancement service, super-tight combination signal tracking and integrity monitoring are realized, an estimated inertial assistance system state is fed back to a tracking loop of the multi-frequency Beidou receiving module, and real-time fault detection is performed on original measurement data.

Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, an example of a process includes receiving, at an apparatus (e.g., a user equipment (UE) or component of the UE), a plurality of resource blocks associated with a positioning reference signal (PRS). A comb structure of the PRS is repeated in less than all resource blocks of the plurality of resource blocks. The process includes transmitting a phase measurement report to a first network entity. The phase measurement report includes information associated with a measured phase difference between at least one subcarrier set pair of the plurality of resource blocks. As described herein, a subcarrier set includes at least one subcarrier.

The invention provides a dual-antenna attitude and orientation and robust self-adaption method based on integrated navigation, which comprises the following steps: combining an INS (inertial navigation system) and a dual-antenna GNSS (global navigation satellite system), and enabling the system to output continuous and stable high-precision carrier attitude information when a GNSS signal is interfered by using dual-antenna integrated navigation. According to the method, most of satellite end clock correction, ionosphere and troposphere errors and receiver end clock correction are eliminated by using double-antenna GNSS pseudo-range and carrier phase double difference, robust statistics are calculated through heading prediction residual vectors to obtain robust factors, an observation noise covariance matrix is expanded to reduce the influence of system noise and observation noise, and the system performance is improved. A Mahalanobis distance based on a prediction residual vector is introduced to detect whether a system is abnormal or not, a state prediction covariance matrix is adjusted through a self-adaptive factor, weight reduction of an abnormal INS dynamic model is achieved, and the stability and reliability of system attitude information are improved through a noise covariance self-adaptive control mechanism.

The invention discloses a time hopping code estimation and multi-hop coherent combination method and device for satellite communication, and belongs to the field of digital signal processing. A sending end disperses information symbols in specified time slots of different time frames for repeated transmission, the time slot where a sending signal is located is determined by a time hopping code, and both communication parties agree that the time hopping code changes randomly within a predetermined range. And a receiving end performs time hopping code and carrier phase joint estimation on the time hopping signal transmitted through the AWGN channel by using a cross entropy iteration method. Performing binary quantization on a time hopping code and a carrier phase, obtaining an estimated value of the time hopping code and the carrier phase according to a binary quantization bit generation probability, selecting a time slot where a signal is located and compensating the carrier phase, performing coherent combination on multi-hop signals, and selecting a sample with small combined signal-to-noise ratio loss to update the binary quantization bit generation probability. And iterating to obtain a global optimal vector group. According to the global optimal vector group, multi-hop coherent combination is realized, the demodulation signal-to-noise ratio is improved, and the reliability of time-hopping communication is effectively improved with low complexity.

The invention discloses a satellite-based enhancement information generation method and system based on a low-orbit constellation, and relates to a satellite navigation enhancement technology, and the method comprises the steps: decoding and processing Beidou PPP-B2b message information, so as to obtain a Beidou satellite high-precision orbit and a clock error; smoothing the pseudo-range observation value by using the low-orbit satellite carrier phase observation value; constructing an ionosphere-free combined observation value by using the observation data of the low-orbit satellite, and resolving the real-time position of the low-orbit satellite based on the obtained high-precision orbit and clock correction of the Beidou satellite to obtain the position information and clock correction information of the low-orbit satellite; performing satellite-based enhanced differential correction calculation by using the obtained low-orbit satellite position information, low-orbit satellite observation data and GNSS basic navigation messages to obtain a satellite-based enhanced orbit and clock differential correction; and carrying out pseudo-range residual error correction according to the obtained satellite-based enhancement difference correction number, and carrying out satellite-based enhancement integrity parameter calculation based on a correction result. According to the method, the position of the low-orbit satellite can be determined synchronously without depending on an external high-precision GNSS satellite orbit and clock error data, and the state of the low-orbit satellite is monitored.

The invention relates to the technical field of high-precision positioning, in particular to an outdoor immersive text and travel hybrid positioning and dynamic rendering optimization method, and the method comprises the steps: obtaining a positioning signal of a mobile terminal in a target service area through a hybrid positioning model; the positioning signals comprise an ultra-wideband ranging signal, a visual inertial odometer signal, a real-time carrier phase difference signal and an inertial navigation signal; processing the positioning signal through a multi-layer signal processing filtering model to obtain coordinate data, and generating a space coordinate; constructing a user movement situation prediction model based on the space coordinates, generating a navigation prediction track and navigation confidence, and generating a preloading strategy; acquiring geographical environment parameters of the target service area, and integrating the space coordinates, the geographical environment parameters, the preloading strategy and the virtual object through a multi-dimensional virtual-real fusion model to generate an augmented reality space scene; and analyzing the user movement track data and the augmented reality space scene through a multi-modal driving model to generate interactive content.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Specifically, the disclosure related to method and apparatus for measuring positioning reference signal in a wireless communication system. The method and apparatus for performing a receiver and a method and apparatus for performing a transmitter in a wireless communication system, as well as a transmitter device and a receiver device are provided herein. Wherein, a method performed by a receiver in a communication system, comprises: acquiring configuration information of a reference signal for positioning: performing a carrier phase-based positioning measurement based on the configuration information: and reporting and / or transmitting a result of the carrier phase-based positioning measurement.

The invention relates to a method for reducing the effects of noise suppression on the measurement of the phases of satellite navigation signals at the point of their reception, wherein, in the method, a one-dimensional or multi-dimensional antenna array is provided with multiple reception antennas, satellite navigation signals received by the reception antennas are processed in a signal processing unit, the received satellite navigation signals undergo noise suppression in the signal processing unit by means of a spatial filter, i.e., by means of spatial filtering, for example by a power inversion (PI) filter or a projection filter, and after the noise suppression by means of the signal processing unit, the carrier phase of at least one or each satellite navigation signal is determined and is corrected by calculating parameters of one or more eigenbeamformers.

The invention discloses an inverter parallel single bus active carrier phase synchronization method. A host sends a carrier synchronization signal to a slave through a synchronization signal line at a carrier counting zero point; the slave reads numerical values in the basic calibration register, the time deviation register and the period register while receiving the carrier synchronization signal, and calculates a deviation value delta psi of carrier phases of the current slave and the host; and compensating the period deviation in the period register through the deviation value delta psi, so that the carrier counting zero point of the slave is aligned with the carrier counting zero point of the host. An existing hardware system does not need to be expanded, extra hardware cost is not increased, and the hardware size is not expanded. And the carrier wave difference of different master and slave controllers can be dynamically compensated according to an established parallel operation system. The carrier synchronization of the host and the slave is realized in a carrier phase deviation period, the synchronization speed is high, the precision is high, the synchronization can be locked after synchronization, and the condition of carrier synchronization failure in the operation process is avoided. And the stability is excellent.

The invention relates to a space-ground integrated Beidou high-precision positioning method applied to urban canyons, and belongs to the technical field of navigation positioning. The method comprises the following steps: deploying a pseudo satellite base station, calibrating coordinates of the base station through carrier phase difference, and monitoring the number of Beidou visible satellites; a master pseudo-satellite is determined, timestamps and ephemeris data are broadcasted to slave pseudo-satellites through Beidou short messages, and the slave pseudo-satellites are combined with bidirectional ranging data to correct a local clock to realize high-precision synchronization; receiving Beidou and pseudo-satellite signals by a user terminal, screening effective observation values through a shielding judgment mechanism, substituting the effective observation values into a non-difference observation equation in combination with pseudo-satellite reference difference data, and resolving a fusion result through an elastic coupling mode; and finally, multi-path interference is identified by using pseudo-satellite double antennas, and historical data is called to construct an error model to correct a fusion result. The space-ground integrated positioning of Beidou and pseudo satellites in an urban canyon scene is realized, the centimeter-level positioning precision is stably output, and the high-precision positioning requirements of urban traffic, surveying and mapping and the like are met.

The invention relates to the technical field of dam safety monitoring, in particular to a method and system for improving dam GNSS deformation monitoring precision through base station and observation station combined network adjustment. The method comprises the following steps: arranging base stations and monitoring points to form a GNSS monitoring network; gNSS original observation data are collected in real time and preprocessed; constructing a joint network adjustment model, and taking base station coordinates as constraints and monitoring point coordinates as to-be-estimated parameters; performing baseline resolving based on the double-difference carrier phase observed quantity to obtain a baseline vector and a covariance matrix thereof; carrying out overall adjustment on the baseline vector by adopting a robust estimation method, and solving an optimal coordinate estimated value and precision information of the monitoring point; carrying out deformation analysis on the basis of the adjusted coordinate time sequence, and extracting tendency, periodicity and abnormal deformation; and outputting a deformation monitoring result, and carrying out visual display and early warning. According to the method, the precision and reliability of dam deformation monitoring are effectively improved through combination of network adjustment and robust estimation.

A method and apparatus are provided for processing a GNSS signal received at a receiver. The method comprises mixing a local carrier signal with samples of the GNSS signal to generate carrier-free signal samples. It further comprises: correlating the carrier-free signal samples with a local spreading code to generate a complex-valued correlation result; and wiping off at least one of the data bits from the complex-valued correlation result, to produce a data-free complex-valued correlation result. A carrier phase of the local carrier signal is controlled based on a Doppler estimate for the GNSS signal, wherein the Doppler estimate is based at least in part on inertial measurements made at the receiver.

The invention provides an unmanned aerial vehicle navigation decoy method and system based on multimode satellite signal counterfeiting. The method comprises the following steps: firstly, acquiring original signal parameters, covering signal time delay, carrier phase and signal intensity distribution, of multimode satellite signals in an unmanned aerial vehicle navigation link in a target area in real time; secondly, extracting spatio-temporal characteristics through signal time delay and carrier phase, and generating time domain synchronous forged navigation parameters in combination with signal strength dynamic change; dynamically adjusting the signal time delay correction and the carrier phase offset in the forged navigation parameters; meanwhile, dynamic compensation is carried out on the navigation message based on the three-dimensional coordinate increment, and a multimode forged navigation signal covering the receiving end of the unmanned aerial vehicle is generated; and finally, superposing the forged navigation signal and the original signal parameter to form a deceptive navigation track for inducing the unmanned aerial vehicle to deviate from the original route. According to the technical scheme provided by the invention, the multi-mode compatibility and concealment of navigation decoy of the unmanned aerial vehicle can be improved.

The invention belongs to the technical field of time service, and relates to a Beidou time service delay processing method and device based on PPP-B2b. The method comprises the following steps: acquiring a navigation signal of a current epoch to obtain an observation value, a broadcast ephemeris and precise point positioning service information; obtaining a precision satellite position and a precision satellite clock error according to the broadcast ephemeris and the precision single-point positioning service information; forecasting to obtain a forecast value; calculating a difference value between the forecast value and the observation value, when the difference value does not exceed a preset threshold value, establishing a satellite pseudo-range and carrier phase ionosphere-free combination observation equation, establishing an antenna position constraint virtual observation equation, and performing resolving according to the combination observation equation and the virtual observation equation to obtain a receiver clock error result; and correcting the pulse per second according to a clock error result of the receiver so as to carry out delay time service. According to the invention, accurate time service can be realized, interference and environmental influence are avoided, and the convergence speed is high.

In estimating a position of a vehicle utilizing a global navigation satellite system (GNSS), it is desirable to exclude outliner GNSS measurements due to navigation signals via non-light-of-sight paths from the GNSS to the vehicle, but it leads to a distorted satellite geometry distribution. Complementariness between low-lying visual landmarks and healthy but high-elevation satellite measurements is explored to improve the geometry constraint. Measurements of an inertial measurement unit, low-lying visual landmarks captured by a forward-looking camera onboard the vehicle, and healthy but high-elevation satellite measurements are tightly-coupled integrated via sliding window optimization of system states used in a factor graph. To improve estimation performance, good initial guesses of system states are important. As such, initial guesses of velocity set and position set inside a sliding window are estimated simultaneously based on data of Doppler measurement, double-differenced (DD) pseudorange measurement and DD carrier-phase measurement as obtained in GNSS measurements.

The invention discloses a fusion type optical fiber distributed multi-point disturbance detection demodulation system and a multi-point fault positioning method. The fusion type optical fiber distributed multi-point disturbance detection demodulation system comprises two light sources, a one-way Mach-Zehnder optical fiber interferometer, a phase-sensitive optical time domain reflectometer and a data acquisition and processing module, when a plurality of abnormal vibration events act on the sensing optical fiber at the same time, a continuous laser signal emitted by the first laser enters the one-way Mach-Zehnder interferometer, and a photoelectric detector receives a continuous interference sensing optical signal in real time; a continuous laser signal emitted by the second laser is converted into a periodic pulse optical signal, the periodic pulse optical signal enters the phase-sensitive optical time domain reflectometer and the one-way Mach-Zehnder interferometer, and the pulse optical signal is received in real time by the photoelectric detector; the data acquisition and processing module adopts an improved phase generation carrier phase demodulation scheme to demodulate the phase change of a vibration signal applied to the sensing optical fiber so as to calculate amplitude-frequency information; and the obtained backward Rayleigh scattering light signals are utilized to calculate and demodulate position information of a plurality of fault events.

The invention relates to the technical field of wireless communication, and discloses a communication equipment command and dispatch system based on artificial intelligence, the system maps the state of communication equipment into a standardized carrier phase disturbance mode, and after the disturbance mode is adaptively adjusted in combination with channel noise perception and conflict arbitration logic, the communication equipment is commanded and dispatched. Controlling the radio frequency front end to carry out injection; the adjacent communication equipment directly detects the disturbance mode to trigger the cooperative scheduling action by monitoring the physical error signal of the carrier synchronization loop of the adjacent communication equipment, and the implicit cooperative mode based on the physical layer beacon is constructed, so that the complex high-level signaling interaction required by the traditional scheduling is avoided, and the scheduling efficiency is improved. According to the method, the millisecond level, determined by a software protocol, of the collaborative response time between the devices is substituted into the microsecond level determined by the hardware physical layer response entscheid, the system can still maintain reliable transmission of scheduling instructions when facing high-density concurrent conflicts and strong channel noise, and a technical implementation path is provided for ultra-low-delay and high-reliability communication.

Disclosed are techniques for wireless communication. In an aspect, a network node receives, from a network entity, a configuration for reporting carrier phase measurements of one or more reference signal resources spanning a plurality of subcarriers, wherein the configuration indicates one or more center frequencies to use for reporting the carrier phase measurements, obtains one or more carrier phase measurements of the one or more reference signal resources based on the one or more center frequencies, and reports, to the network entity, the one or more carrier phase measurements.

The invention discloses a positioning method and device based on fusion of single Beidou navigation and a high-precision RTK technology, a medium and equipment in the technical field of satellite positioning. The positioning method comprises the following steps: determining single Beidou navigation information generated by a target receiver based on a single Beidou positioning device; extracting a pseudo-range observation value and a carrier phase observation value of the B1 / B2 frequency point; extracting a satellite number, epoch time, an ionosphere delay coefficient and a troposphere delay coefficient; determining delay deviation correction data of the Beidou satellite signal; total delay deviation in the signal transmission process is measured, and whether delay deviation correction is carried out or not is judged based on the dynamic delay threshold value model and the total delay deviation in the signal transmission process; and fusing the pseudo-range observation value of the receiver and the delay deviation correction data of the Beidou satellite signal, executing double-difference carrier phase calculation, and outputting a centimeter-level positioning result. According to the method, various transmission errors can be effectively eliminated, the positioning precision is remarkably improved, and the positioning continuity and stability are ensured.

The invention relates to the technical field of high-frequency multichannel synchronous transmission, in particular to a time domain reflection compensation design method for high-frequency signal transmission loss, which comprises the following steps of: 1, responding to a synchronous trigger signal to generate an active reflection reference signal with a determined time domain position; 2, aligning time marks between channels through cross-correlation operation; 3, extracting a reflection feature template of the channel from the alignment signal, and recognizing and eliminating crosstalk components through convolution operation with an adjacent channel template; 4, constructing a time-varying transfer function model according to the amplitude envelope attenuation characteristic and the carrier phase jump characteristic of the reflection characteristic template; and 5, generating a compensation filter based on the time-varying transfer function model, and verifying the compensation effect through secondary reflection. Through cross-correlation operation, accurate alignment of multi-channel signal time scales is realized, the time delay difference between different transmission channels is overcome, signal synchronization of each channel is ensured, and the beam forming precision is improved.

The invention provides a downlink data transmission method, device and system for laser fiber power supply application, and the method comprises the steps: carrying out the differential coding of downlink data to be transmitted through a transmitting end, and obtaining a data bit sequence; mapping the data bit sequence into a modulation symbol sequence by adopting a single-carrier phase modulation mode; performing digital-to-analog conversion on the modulation symbol sequence to obtain an analog signal; and outputting downlink energy and downlink data through an energy optical fiber according to the analog signal. According to the invention, the signal frequency spectrum is moved to be far away from the direct current frequency through differential coding and single carrier phase modulation, so that the interference of direct current laser energy on signal detection is minimized, the signal-to-noise ratio is improved, the inter-symbol interference is reduced, and a receiving end is ensured to have enough signal-to-noise ratio to reliably detect data.

Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications, such as to measure a location of a user equipment (UE). A process may include transmitting, at the UE (305), a phase measurement capability of the UE to a network entity (310, 315, 320) for determining a position of the UE. The process may further include receiving, at the UE from the network entity, a phase measurement request for reporting phase measurements for one or more subcarriers received by the UE. The phase measurement request is based on the phase measurement capability of the UE. The process may further include transmitting a phase measurement report to the network entity based on the phase measurement request. The phase measurement report includes information associated with a measured phase of at least one subcarrier of the one or more subcarriers.

The GNSS signal is processed to estimate signal characteristics. Methods and apparatus are provided for processing GNSS signals received at a receiver. The method includes obtaining a sample of a GNSS signal. The samples include a carrier signal modulated by a spreading code. The method includes generating codeless samples based on the obtained samples. These codeless samples contain carrier signals, but spreading codes have been erased. The method may include storing a sequence of codeless samples, the sequence having an associated duration. Further, the method includes analyzing the sequence of codeless samples to estimate one or more signal characteristics over a duration of the sequence. The signal characteristic includes a carrier phase of the carrier signal.

A method and apparatus are provided for processing a GNSS signal received at a receiver. The method comprises mixing a local carrier signal with samples of the GNSS signal to generate carrier-free signal samples. It further comprises: correlating the carrier-free signal samples with a local spreading code to generate a complex-valued correlation result; and wiping off at least one of the data bits from the complex-valued correlation result, to produce a data-free complex-valued correlation result. A carrier phase of the local carrier signal is controlled based on a Doppler estimate for the GNSS signal, wherein the Doppler estimate is based at least in part on inertial measurements made at the receiver.

The invention relates to the technical field of high-precision anti-interference satellite navigation, and particularly discloses a high-precision anti-interference navigation interference subspace quick solving method, which comprises the following steps of: solving a virtual interference subspace required by relatively strong short-time delay deception interference detection based on the position of a satellite to be detected, the phase center position of an array antenna and the attitude of an antenna array plane; and based on multi-stage Wiener filtering forward decomposition, respectively solving a dense suppression jamming subspace, an isolated suppression deception jamming subspace and a dense suppression deception jamming subspace. According to the method, virtual interference data and strong deception interference data do not need to be generated through simulation, so that a pseudo-random code sequence of deception interference does not need to be known, and strength, pseudo-code time delay, carrier phase and the like do not need to be reasonably adjusted; meanwhile, multi-level Wiener filtering forward decomposition based on the data level and the covariance matrix level is good in rank reduction performance, simple in algorithm and small in operand; the method has the advantages of less prior information constraint, easy engineering realization and the like.

A method and apparatus are provided for processing a GNSS signal received at a receiver. The method includes obtaining samples of the GNSS signal. The samples contain a carrier signal modulated by a spreading code. The method includes generating, based on the obtained samples, code-free samples. These code-free samples contain the carrier signal but the spreading code has been wiped off. The method may include storing a sequence of the code-free samples, the sequence having an associated duration. Additionally, the method comprises analysing the sequence of code-free samples to estimate one or more signal characteristics over the duration of the sequence. The signal characteristics include a carrier phase of the carrier signal.

A method and apparatus are provided for processing a GNSS signal received at a receiver. The GNSS signal may be tracked in different ways in two or more respective operation modes. A first epoch is processed according to a first operation mode. In this mode, a carrier phase of a local carrier signal is controlled to track the carrier phase of the GNSS signal using a phase locked loop. A second epoch is processed according to a second operation mode. In this operation mode, the carrier phase is controlled based at least in part on at least one Doppler estimate. The at least one Doppler estimate depends on inertial measurements made at the receiver.

A method and apparatus are provided for processing a GNSS signal received at a receiver. A carrier phase of a local carrier signal is initialised for the current epoch based on a first Doppler estimate. The first Doppler estimate is derived from a measurement gathered in the previous epoch. The carrier phase is updated repeatedly for the current epoch while the GNSS signal is being mixed with the local carrier signal. The updating relies on second Doppler estimates, which are based on inertial measurements made at the receiver.