59 results about "Phase cycle" patented technology

The present invention relates to an intersection signal control method based on multiple intelligent agents, and belongs to the intelligent traffic intersection control technology field. The method realizes the traffic information real-time dynamic sharing by respectively establishing the intelligent agent models of the traffic entities, such as the vehicles, the road sections, the intersections, the signal lamps, etc., and by utilizing the interactivity and the coordinated cooperation among the multiple intelligent agents, and concretely comprises the three links of the signal cycle optimal regulation and control, the phase conflict green light signal control and the vehicle speed guide auxiliary control. The method can obtain the individual operation state of each vehicle intelligent agent real-timely, and can realize the dynamic interaction between the vehicle intelligent agents and a traffic control system via the speed guide. Meanwhile in allusion to a multi-intelligent agent traffic environment, the caused green light time waste is considered when no vehicle passes at the current phase while a whole phase cycle is optimized, the collision is avoided, and the total number of the vehicles passing the whole intersection is increased by switching to the conflicting phases, the queuing waiting time of the vehicles in phase conflict is reduced, and the average delay of the intersection and the parking times can be reduced effectively.

The invention provides a method for realizing wideband direction finding by utilizing three-dimensional orthogonal interferometer. Seven-array element three-dimensional orthogonal antenna array is utilized, a phase discriminator set is adopted to respectively detect phase differences of array elements 1-6 and a reference array element 0, according to cyclophysis of the phase difference, traversing searching is carried out on possible phase cycles and all the possible signal frequencies, azimuth angles and pitch angles are solved, and finally the signal frequency roughly measured by a receiver is taken as reference, one group of traversing values with minimum error are found, and the group of values are estimated signal frequency, azimuth angle and pitch angle. The method of the invention can be applied to place requiring frequency and angle estimation in the fields of communication, radar and wireless monitoring, calculated amount is less, no strict restriction on the position of antenna array element is required, and wideband angle estimation can be realized, thus having great application value.

An improved rapid prototyping and manufacturing system. The improvement is at least two liquid crystal display panels interposed between a UV light source and a descendible platform to form a variably programmable photomask. A computer is connected to each display panel and includes stored, sliced data sets representing parallel, cross-sectional patterns of an object at spaced increments. The platform is lowered, preferably in stepwise increments, and selected patterns are sequentially displayed on each LCD panel as bitmaps generated from the sliced data sets to provide a series of photomasks, each photomask representing a parallel cross-section of the object at spaced increments. Preferably, an entirely opaque display pattern is displayed on the each panel during the time intervals of platform motion and one of the display panels is switched from an entirely opaque display pattern to a pattern representing a parallel, cross-section at least one liquid crystal phase cycle before the other panel is switched.

A power control circuit is provided containing a switch array, which includes segmented switches, a flying capacitor, an output voltage terminal, a feedback loop, and a digital voltage regulator block. The digital voltage regulator block includes an A/D converter, an encoder, an add-subtractor, and a gate logic. These power control circuits do not include pass transistors. A method is also provided, where the charge pumps of the power control circuit are operated in two-phase cycles including a charging phase and a pumping phase. The power control circuit is controlled in both of these phases, thereby reducing the ripple of the output voltage.

The present invention discloses a method of simultaneously conducting more than one step of a radiofrequency phase cycle in a nuclear magnetic resonance (NMR) experiment. The method first involves providing a sample. Next, one or more radiofrequency pulses are applied to a plurality of spatially discrete slices of the sample under conditions effective to simultaneously conduct more than one step of a radiofrequency phase cycle in a single transient. Then, NMR signals generated from the step of applying the radiofrequency pulses are acquired. Finally, the NMR signals are processed to obtain an NMR spectrum.

Jitterless transition of the programmable clock waveform is generated employing a set of two coupled direct digital synthesis (DDS) circuits. The first phase accumulator in the first DDS circuit runs at least one cycle of a common reference clock for the DDS circuits ahead of the second phase accumulator in the second DDS circuit. As a phase transition through the beginning of a phase cycle is detected from the first phase accumulator, a first phase offset word and a second phase offset word for the first and second phase accumulators are calculated and loaded into the first and second DDS circuits. The programmable clock waveform is employed as a clock input for the RAM address controller. A well defined jitterless transition in frequency of the arbitrary waveform is provided which coincides with the beginning of the phase cycle of the DDS output signal from the second DDS circuit.

The invention provides a method for dynamically optimizing a traffic signal of an urban intersection under an environment of vehicle networking. According to the method, firstly, a ratio of an averagequeuing time to a traffic capacity at the intersection is determined as an optimization objective function, and the effects of a minimum average queuing time and a maximum traffic capacity are achieved at the same time, and secondly, the influence of an actual vehicle networking environment is considered, with a communication delay, a phase cycle and an effective green light time as constraints,a signal dynamic optimization model under the environment of vehicle networking is established. Through the method, the signal control effect of the urban intersections with medium and high saturationcan be effectively optimized, at the same time, the traffic environment of the urban intersection can be effectively improved, and the road capacity is improved.

A method for collecting operational parameters of a motor may include controlling the energization of a phase winding of the motor to establish an operating point, monitoring operational parameters of the motor that characterize a relationship between the energization control applied to the motor's phase winding and the motor's response to this control, and collecting information of the operational parameters for the operating point that characterizes the relationship between the applied energization control and the motor's response. The collected information characterizing the relationship between the applied energization control and the motor's response may be employed by a neural network to estimate the regions of operation of the motor. And a system for controlling the operation of motor may employ this information, the neural network, or both to regulate the energization of a motor's phase winding di-ring a phase cycle.

A method and apparatus of imaging multiple volumes of the anatomy of interest using a phase-cycled SSFP pulse sequence and a reverse elliptic centric view ordering to sample a first volume and an elliptic centric view ordering to sample a second volume is disclosed. Dummy acquisitions are played out between imaging of the first and second volumes, and the time to play out the dummy acquisitions is used to change the phase-cycling scheme of the RF pulses of the SSFP pulse sequence. Oscillations in signal are reduced as the spins in the anatomy of interest are brought to a new steady-state by gradually ramping the RF pulse phase increment for acquisition from the first volume to the RF pulse phase increment for acquisition from the second volume. The present invention is effective for reducing transient oscillations in MR signals from resonance and off-resonance spins, thus enabling the use of this technique for the reduction of motion artifacts in phase-cycled SSFP.

A rotational sensing system is adaptable to sensing motor rotation based on eddy current sensing. An axial target surface is incorporated with the motor rotor, and includes one or more conductive target segment(s). An inductive sensor is mounted adjacent the axial target surface, and includes one or more inductive sense coil(s), such that rotor rotation rotates the target segment(s) laterally under the sense coil(s). An inductance-to-digital converter (IDC) drives sensor excitation current to project a magnetic sensing field toward the rotating axial target surface. Sensor response is characterized by successive sensor phase cycles that cycle between L_MIN in which a sense coil is aligned with a target segment, and L_MAX in which the sense coil is misaligned. The number of sensor phase cycles in a rotor rotation cycle corresponds to the number of target segments. The IDC converts sensor response measurements from successive sensor phase cycles into rotational data.

An optical receiving device receives an optical signal that has been modulated by means of phase modulation or quadrature amplitude modulation, converts the received optical signal into an electrical signal using coherent detection, and performs phase compensation on the converted received signal, and includes: a carrier phase estimation unit that estimates carrier phase errors in a received symbol string obtained from the received signal; a gain adjustment unit that performs gain adjustment on symbols input into the carrier phase adjustment unit; a phase cycle slip reduction unit that, by performing statistical processing on an output from the carrier phase estimation unit, detects general noise that causes a phase cycle slip, and reduces the phase cycle slip; and a phase compensation circuit that compensates carrier phase errors contained in the received signal using an output from the carrier phase estimation unit.

The invention discloses a system of detecting and optimizing traffic control by using a three-coordinate radar in the technical field of traffic control. The system comprises a radar detector, a signal control machine and a signal lamp. A data receiving module, a data analysis module, a dynamic allocation module and an execution control module are fixed in the signal control machine. The data receiving module is configured to receive detection data of the radar detector; the data analysis module is configured to store and analyze data of the data receiving module; the dynamic allocation moduleis configured to issue an adjustment command according to the data of the data analysis module; and the execution control module is configured to receive the adjustment command of the dynamic allocation module and act on the signal lamp. According to the invention, comprehensive data of the road are detected in real time based on a three-coordinate radar to provide the powerful data support; intervention on phase releasing of an intersection is performed in real time to avoid congestion; and the total phase cycle does not exceed a reasonable range.

The invention discloses a wideband dual-band Doherty power amplifier based on phase-delayed dual-band output matching networks. The wideband dual-band Doherty power amplifier comprises a wideband power divider, a carrier amplifier circuit, a peak amplifier circuit, a phase delay-based carrier dual-band output matching network and a phase delay-based peak dual-band output matching network. An uplink signal and a downlink signal of the wideband power divider are connected with the carrier amplifier circuit and the peak amplifier circuit respectively; the carrier amplifier circuit is formed by connecting a carrier phase compensation line, a carrier input matching network and a carrier transistor in series; the peak amplifier circuit is formed by connecting a peak phase compensation line, a peak input matching network and a peak transistor in series; the carrier amplifier circuit is connected with the phase delay-based carrier dual-band output matching network; and the peak amplifier circuit is connected with the phase delay-based peak dual-band output matching network. Accordingly, the dual-band working capacity of the Doherty power amplifier is achieved by means of the phase cycle repeatability, and the carrier and peak dual-band output matching networks are designed by adopting a stepped impedance structure.

A radiating phase-shifting cell is designed to favour the excitation of an equivalent resonance of the “slot” type in a first part of the phase cycle, and to favour an equivalent resonance of the “microstrip” type in a second part of the phase cycle. This property notably allows the bandwidth of the phase-shifting cells to be optimized. A phase range of 360° can in effect be segmented into two sub-ranges of around 180°. This segmentation into two sub-ranges is made possible by the complementarity of the resonant modes of the slot or microstrip type. The radiating phase-shifting cell is notably applicable to reflector arrays for an antenna designed to be installed on a space craft such as a telecommunications satellite or on a terrestrial terminal for satellite telecommunications or broadcasting systems.

A system and method is provided for performing a magnetic resonance fingerprinting (MRF) study in the face of inhomogeneous magnetic fields. The process includes performing a balanced steady-state free precession (bSSFP) pulse sequence multiple times to acquire a multiple MRF datasets from at region of interest (ROI) in a subject, wherein performing the multiple bSSFP pulse sequences includes cycling through multiple phase patterns that differ across the multiple times. The process also includes comparing the multiple MRF datasets with a MRF dictionary to determine at least one tissue property indicated by each of the multiple MRF datasets, producing an aggregated indication of the at least one tissue property, and producing at least one map of the at least one tissue property using the aggregated indication of the at least one tissue property.

The invention relates to an L type simplified acoustic vector sensor array multi-parameter joint estimation quaternion method. According to the method, an array receives K far-field and uncorrelated narrow-band acoustic signals with different frequencies; two groups of data received by the array are superposed according to the sound pressure of the same array element as well as vibration velocities in the direction of an x axis and the direction of a y axis so as to form full-array receiving quaternion data; autocorrelation matrix feature decomposition is carried out on the data, so that the estimated value of an array steering vector is obtained; the estimation of sub-array steering vectors is reconstructed according to the estimated value of the array steering vector, and the rough estimated value of the direction cosine of the signals is obtained according to the rotation invariant relation of the sub-array steering vectors; and the translation invariant relationship matrix of sub-arrays on the x axis and the y axis can be obtained through using the translation invariant relationship of the sub-arrays on the x axis and the y axis, and the phase cycle fuzzy number of the translation invariant relationship matrix in the direction of the x axis and the direction of the y axis is determined according to the rough estimated value of the direction cosine, and therefore, the accurate estimated values of an azimuth angle and a pitch angle can be obtained. With the method of the invention adopted, the orthogonality between the components of an acoustic vector sensor can be kept, and better model error robustness can be achieved.

The invention provides a carrier phase cycle slip inhibition method based on phase error amplitude-limiting processing. According to main factors causing carrier phase cycle slip, a carrier wave tracking loop easily produces phase jump when a tracking loop produces dramatical phase jitter or concentrated emergence of the same phase deviations of multiple symbols in a short time. According to the factors causing the phase cycle slip, phase errors output by a phase discriminator can be processed in the carrier wave tracking loop. Large phase jitter and the phase deviations of the same continuous symbols can be avoided by conducting amplitude limiting on instantaneous phase discrimination errors and accumulation values of phase discrimination errors, and accordingly the occurrence probability of the phase cycle slip of the loop is can be reduced. Compared with a traditional carrier wave tracking method, the occurrence probability of the phase cycle slip of the carrier wave tracking loop can be reduced by 67% under the condition that the dynamic conditions of the loop are not considered, and the occurrence probability of the phase cycle slip of the carrier wave tracking loop can be reduced by 38% under the condition that the Doppler frequency of input signals is constant.

The invention provides a method for controlling the passing of rail vehicles at a level crossing under half-exclusive right-of-way. The method includes the following steps: reading the time t0 when arail vehicle arrives at the beacon of a level crossing and the phase cycle composition Tnow(t0) and the working state of a signal control machine at the level crossing at the time t0; determining thevalue range of the delay time t in opening the rail vehicle passing route according to the time t0, the phase cycle composition Tnow(t0) and the working state; calculating the delay time f(t0, t) of arail vehicle passing the level crossing and the delay time d(t0, t) increased by social vehicles at the level crossing; calculating the efficiency value e(t0, t) according to the delay time f(t0, t)of the rail vehicle passing the level crossing and the delay time d(t0, t) increased by social vehicles at the level crossing, determining that t=td, and maximizing the efficiency value e(t0, t); andopening the rail vehicle passing route after a delay of the time td, and adjusting the operation cycle of the level crossing according to the time td. The delay caused by tramcars to the social traffic can be minimized while the operation efficiency of tramcars is maximized, and the integration of tramcars and road vehicles can be promoted.

In a magnetic resonance spectroscopy method, an excitation RF pulse is emitted with simultaneous emission of a first gradient during an excitation segment having a time duration corresponding to a transmission duration of the excitation RF pulse, a first refocusing RF pulse is emitted that has a first phase with respect to the excitation RF pulse with simultaneous emission of a second gradient during a first refocusing segment that temporally immediately follows the excitation segment and has a time duration corresponding to a transmission duration of the first refocusing RF pulse, an intermediate segment is allowed to elapse immediately temporally following the first refocusing segment for, among other things, temporal positioning of a secondary spin echo, a second refocusing RF pulse is emitted that has a second phase with respect to the excitation RF pulse, with simultaneous emission of a third gradient during a second refocusing segment immediately temporally following the intermediate segment and having a time duration corresponding to a transmission duration of the second refocusing RF pulse, the secondary spin echo is acquired during an acquisition segment immediately temporally following the second refocusing segment, and the aforementioned steps are repeated with a variation of phases of the RF pulses corresponding to a phase cycle.

A multiply phase-cycled steady state free precession sequence has at least two sub-sequences with alternating radio-frequency excitation pulses. An intermediate image data set is generated from raw data that are acquired with each sub-sequence. A resulting image data set is formed from the intermediate image data sets. Radio-frequency excitation pulses for different sub-sequences have supplementary phases differing from one another, such that successive radio-frequency excitation pulses cannot lead to a non-alternating excitation in any sub-sequence. A magnetic resonance apparatus has a corresponding apparatus controller that implements the sequence.

The invention discloses a boundary clock window determination method. The method comprises the following steps: dynamic clock configuration: enabling an FPGA to initialize dynamic clock configurationaccording to a dynamic configuration command; training data transmission: enabling a CPU to query clock locking state information of the FPGA and transmit training data to the FPGA; phase cycle section testing: traversing the whole phase cycle section to perform dynamic clock configuration and transmission training; and clock window determination: obtaining a transmission correctness test result returned by the FPGA, and re-initiating clock locking according to the test result to complete clock window determination. Dynamic configuration of clock phases is completed by utilizing dynamic configuration interfaces of clock resources, such as PLL provided by the FPGA in cooperation with simple software and hardware logic functions. The design is simple, and certain self-adaptability is achieved. The method has a deserved value when the clock window of the medium-low speed parallel inter-chip interconnection bus is determined.