92results about How to "High phase shift accuracy" patented technology

The invention relates to a projection objective lens wave aberration detection device and method. Light emitted by a light source is uniformly radiated on a projection objective lens object plane, a scatter plate and a needle hole are installed on a masking stage, the needle hole is arranged on an object plane of a projection objective lens, the field of view is selected through the movement of the masking stage, a shearing grating is arranged on an image plane of the projection objective lens, the shearing grating is installed on a wafer stage together with a detector, the phase shifting function is realized through the transverse precise movement of the grating by the wafer stage, and simultaneously each frame of a shearing interference figure in the phase shifting process is recorded by utilizing the detector. Two-dimensional shearing is realized by utilizing the two-dimensional grating, the phase shifting function is integrated into the shearing interference instrument, and the high-precise measurement of the projection objective lens wave aberration is realized by adopting the characteristics of the phase space vector.

The invention belongs to a five-bit radio-frequency MEMS phase shifter in radio-frequency communication and MEMS technologies, comprising a CPW signal wire, an insulating layer, a grounding wire, an MEMS hole-plate metal beam, an elastic cantilever-type support, a proportional capacitor, a direct current (DC) bias electrode, an insulating layer, 31 MEMS switches consisting of bias leads, 5 DC loaded electrodes, connecting leads and a substrate with an insulating layer. The invention effectively overcomes the defect of phase-shifting malfunction of the MEMS metal beam due to self oscillation by adding the DC bias electrode, adopts the hole-plate metal beam and the elastic cantilever-type support to decrease a voltage to be pulled down by approximate 9V, not only realizes the small step of 11.25, 5-bit phase shifting and 32 phase-shifting states, but also has little reflection loss and high phase-shifting precision up to 3.5 and has the advantages of low insertion loss and pull-down voltage, small step amplitude, high bits, phase-shifting precision and reliability of the phase shifter, simpler machining process, matched use with a modern electronic communication system, and the like.

The invention belongs to the technical field of optical interference detection and particularly relates to a phase shift point-diffraction interference detection device and method based on a reflecting grating. The phase shift point-diffraction interference detection device based on the reflecting grating comprises a light source, a collimation and beam expanding system, a window, an object to be detected, a first lens, an unpolarized splitting prism, the reflecting grating, a small-hole reflector, a second lens and an image sensor. A light beam emitted by the light source enters the collimation and beam expanding system, the outgoing beam subjected to collimation and beam expanding of the collimation and beam expanding system enters the first lens through the window and the object to be detected, and the light beam subjected to focusing of the first lens is divided into a bundle of reference light and a bundle of object light by the unpolarized splitting prism. The reference light irradiates to the small-hole reflector, and the object light irradiates to the reflecting grating. The phase shift point-diffraction interference detection device based on the reflecting grating is low in system complexity and cost, simple in structure, flexible and convenient to operate and free of special optical elements of a polarizer group and the like.

The invention relates to an arbitrary polarized wave generation and calibration method. The generation method comprises the following steps: generating digital signals in a base band, and carrying out amplitude-phase adjustment and compensation on two paths of orthogonal digital signals; and converting the digital signals into analog signals, up-converting the analog signals into radio frequency signals, carrying out power amplification and distribution on the radio frequency signals through two transmitters, and synthesizing polarized waves in arbitrary polarization directions in an ortho-mode coupler by two signals. In the design of polarized signal calibration, the calibration method includes steps of coupling two paths of a few signals from two paths of transmission signals to enter calibration channels; comparing the consistency of signals in the two channels and searching the minimum difference of two phases of polarization signals by using an optimization algorithm; and comparing the differences of the two paths of signals, feeding the differences back to a polarized wave generation unit, and measuring and compensating the generated signals so as to ensure the consistency of the signals in the two channels.

Systems and methods for remote detection of volcanic plumes using satellite signals. The invention solves the problem of remotely detecting volcanic plumes, including those embedded in clouds, by providing a system that can be installed onboard a mobile platform, such as an aircraft, a satellite, a weather balloon, a ship or a buoy. The volcanic plume detection system tracks RF signals (such as GPS signals from satellites) arriving at the mobile platform, and issues an alert or warning when characteristics of the RF signals indicate the likely presence of a volcanic plume in the monitored space. More specifically, the system in accordance with one embodiment utilizes the refractive properties of hydrogen sulfide (H2S), a gas that is abundant in nearly all volcanic eruptions, to infer the presence of a volcanic plume.

The invention belongs to a five-bit X wave band phase shifter matched with an X wave band communication device for use. The five-bit X wave band phase shifter comprises a CPW (circular polarized wave) signal line rotatably arranged on a base plate and chamfering at exterior angles of corners, an insulating layer and CPW (coplanar waveguide) ground wires, an MEMS (micro-electromechanical systems) switch beam, a support plate, an upper polar plate and a lower polar plate of an MAM capacitor as well as an MEMS switch group consisting of components inside a supporting piece thereof. A connecting bridge, a bias electrode and an insulating layer are arranged between the CPW ground wires at the front and rear ends of the corners cross the CPW signal line. The positive electrode and the negative electrode of the bias electrode are connected with a lead. The base plate with the insulating layer is arranged on the upper surface. Compared with a conventional five-bit X wave band phase shifter, the five-bit X wave band phase shifter has the advantages that the area of the five-bit X wave band phase shifter provided by the invention is reduced by nearly 1 / 3, meanwhile the performance and the stability of the phase shift are improved. Therefore, the five-bit X wave band phase shifter is compact in structure, small in volume, high in strength and stability, low in insertion loss, large in Q value and high in phase shifting precision, and can be processed with high precision and large scale. Meanwhile, the packaging difficulty and the production cost in the production process are reduced and the like.

The invention discloses a grating self-tuning method based on the straight line phase in the three dimensional sweeping system, which relates to the reversion project, obtains four phase-shifts charts with the phase-shift method, then, carries on the straight line phase transition to the obtained four phase-shifts chart, carries on the two rides straight line fitting to the straight line phase obtain the fitting straight line phase, adjust the phase spot of deviate fitting straight line phase on the fitting straight line phase and obtain the adjustment phase spot, and then based the adjust phase spot, carry on the inverse transformation with the phase-shift method to obtain the new four phase-shifts chart, compared with the original four phase-shifts chart, obtain the transfer function between the projection diffraction grating and the gathering grating, and take the transfer function as the adjustment optimization function, adjust the computer production diffraction grating, realized the self-tuning of the grating. The method effectively improved the projection grating profile sine and the precise phase-shift, can enhance the grating profile robustness, also can increase the phase-shift precision, and then enhance the system measuring accuracy.

The invention discloses an ultra-wideband beam former based on a differential operator and an achieving method thereof. The ultra-wideband beam former comprises a beam summation module and a plurality of array element channels. Each array element channel comprises a weight coefficient and delay quantity storage module, a narrow-band phase compensation module and an accurate delay compensation module. The achieving method of the ultra-wideband beam former comprises the steps of storage of weight coefficient and delay quantity, narrow-band phase compensation, accurate delay compensation and beam summation. A differential operator delay compensator is adopted to perform delay compensation, multiplication times is reduced, and calculation amount and multiplier resource expenses are reduced. The delay compensator is an all-pass filter, accurate delay compensation in full bandwidth can be achieved, the beam former based on the differential operator delay compensator can achieve wide-angle continuous beam scanning by adopting a programmable logic device field programmable gate array (FPGA), and has high phase shift / delay accuracy.

The invention provides a 180-degree broadband phase shifter on a passive chip, and the phase shifter comprises a balun and a broadband matched single-pole double-throw switch, and is characterized in that the difference of the phases of the two output ports of the balun is 180 degrees, and the broadband matched single-pole double-throw switch switches between the two output ports of the balun so as to realize the 180-degree broadband phase shifting; the broadband matched single-pole double-throw switch comprises a first metal oxide semiconductor (MOS) field effect transistor, a second MOS field effect transistor, a third MOS field effect transistor, a fourth MOS field effect transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; and the gate of the first MOS field effect transistor is connected with a first control power supply through the first resistor, the gate of the second MOS field effect transistor is connected with a second control power supply through the second resistor, the gate of the third MOS field effect transistor is connected with a third control power supply through the third resistor, and the gate of the fourth MOS field effect transistor is connected with a fourth control power supply through the fourth resistor. According to the 180-degree broadband phase shifter on the passive chip, the broadband low-parasitic amplitude modulation and high-phase shift precision 180-degree phase shifting can be realized, and the phase shifter can be widely applied to electronic warfare radar, digital mobile communication, microwave and millimeter wave communication and other systems.

The invention discloses a radio frequency active phase shifter structure, and relates to the technical field of electronic circuit design, in particular to the technical field of active phase shifterdesign suitable for a phased array system. The structure comprises an orthogonal coupler formed by an orthogonal hybrid network; a quadrature amplitude control module composed of a common-gate transistor array; an orthogonal synthesis and output matching network; an interstage matching network composed of a transformer and a capacitor; an orthogonal calibration module composed of a transistor array; and a bias module composed of a common source transistor. The structure is suitable for the CMOS process. By means of the low coupling coefficient coupler, the bandwidth of orthogonal signals is broadened, the non-ideal influence on the switching state of the transistor is eliminated through the common-gate differential transistor, the amplitude control precision is improved, and the purposes of the 360-degree phase adjustment range, the 6-bit phase shift, the broadband width, the high precision, the low amplitude deviation and the low cost are achieved.

The invention discloses an ultra wide band high-linearity active phase shifter. The ultra wide band high-linearity active phase shifter comprises a Lange coupler, ultra wide band amplifiers, a vector synthesis amplifier, an active Balun and a digital analog converter. The ultra wide band high-linearity active phase shifter is characterized in that a radio frequency signal is inputted into the Lange coupler, the Lange coupler generates an I-route signal and a Q-route signal, the wide band of the I-route signal and the wide band of the Q-route signal are orthogonal, the I-route signal and the Q-route signal are outputted into the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier respectively, the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier amplify the I-route signal outputted by the Lange coupler and the Q-route signal outputted by the Lange coupler respectively to generate four routes of orthogonal signals with the equal amplitude, and the four routes of orthogonal signals with the equal amplitude are outputted to the vector synthesis amplifier, the vector synthesis amplifier receives a phase and amplitude control signal outputted by the digital analog converter and a quadrant selection control signal outputted by the digital analog converter, conducts signal synthesis, phase selection and quadrant selection on the four routes of orthogonal signals which have the equal amplitude and are outputted by the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier, and then outputs an I-route phase shifting signal and a Q-route phase shifting signal to the active Balun, and the active Balun conducts impedance matching on the phase shifting signals and outputs the phase shifting signals.

The invention discloses an adjustable optical phase shifter and the phase shifting process, which is made up of two acousto-optic modulators, radio frequency power amplifier and sine signal generator, the output end wire of the generator, one wire is connected to the input end of the radio frequency power amplifier, another wire is connected to the a electron phase shifter in series and then connected to the input end of another radio frequency power amplifier. The phase shifting process, the incoming ray enters the acousto-optic modulator 1, the sine wave signal generator transmits radio frequency signal with the same frequency to the radio frequency power amplifier and the electro phase shifter, adjusts and controls the electron phase shifter, the two acousto-optic modulators are driven by the radio frequency signal with the same frequency and different phase; the acousto-optic modulator generates the first grade diffraction as the incoming ray of the acousto-optic modulator the diffraction of the modulator is used as the output light, the output light has the same frequency to the incoming ray and the phase can be shifted. The merits of the invention are: it needs no phase shift label, and it can generate dynamic adjustable optical phase shift.

The invention discloses a rail traffic axle counting system based on FPGA phase detection. The rail traffic axle counting system comprises a first wheel sensor arranged on one side of a rail and a second wheel sensor arranged on the other side of the rail, the first wheel sensor and the second wheel sensor are connected with a control room through axle counting equipment, and the axle counting equipment comprises a first FPGA, a first conditioning circuit, a second FPGA and a second conditioning circuit. The first FPGA generates a pulse signal with the frequency f1 and sends the pulse signal to the first wheel sensor through the first conditioning circuit, and a signal returned by the first wheel sensor is connected to the first FPGA through the first conditioning circuit to be subjected to data processing. The second FPGA generates a pulse signal with the frequency f2 and sends the pulse signal to the second wheel sensor through the second conditioning circuit, and a signal returned by the second wheel sensor is connected to the second FPGA through the second conditioning circuit to be subjected to data processing. The first FPGA and the second FPGA sends the counting results to the control room. The debugging efficiency is improved, and the rail traffic axle counting system is suitable for a train travelling at a high speed.

The invention discloses a microwave and millimeter wave wideband 5bit singlechip integrated digital phase shifter. The phase shifter is formed by the cascade of 11.25-degree, 22.5-degree, 45-degree, 90-degree and 180-degree phase shift circuits; high / low-pass filter topology is adopted in a 11.25-degree / 22.5-degree phase shift position; reflective topology design is adopted in 45-degree / 90-degree / 180-degree phase shift position; and the phase shifter totally can realize 32 phase shift states in a phase shift stepping value range of 0 to 360 degrees, the finally layout is arranged by the phase shifts from big to small, and the working frequency band of the phase shifter is 6 to 18GHz. The phase shifter has simple circuit topology and design process, simple manufacturing process, high yield, small chip area, wide working frequency band, low insertion loss, high phase shift precision, low input and outlet voltage standing wave ratio and small insertion loss difference of the phase shift states.

The invention relates to the microwave technology. In order to solve a problem of poor accuracy of the existing phase shifter, the invention provides an 8-bit temperature compensation type numerical-control phase shifter. The phase shifter is characterized by comprising an analog phase shifter, a power module, an FPGA module, a storage module, a communication module, an operational amplifier circuit, a digital-analog converter, and a temperature sensor. The storage module, the communication module, the digital-analog converter, and the temperature sensor are respectively connected with the FPGA module; and the digital-analog converter is connected with the operational amplifier circuit connected with a control voltage terminal of the analog phase shifter. The power module provides power for all modules. The 8-bit temperature compensation type numerical-control phase shifter has the following beneficial effect: the phase-shifting accuracy of the phase shifter is improved. The 8-bit temperature compensation type numerical-control phase shifter is provided.

This invention relates to a method for realizing accurate phase shift by a ferrite shifter, which applies a numerical control mode combining a flux excitation and a saturated digital excitation to make the shifter to generate accurate shift including: dividing a ferrite loaded on a waveguide center along the direction of the waves into n sections and the n is greater or equals to 2, the first section of which applies a flux excitation mode, the rest n-1 sections apply a saturation digital mode then overlapping the shift values of them and the shifter carries out digital control shift according to the step volume of the flux excitation section in the sphere greater or equals to 360deg.

The invention discloses a dual-band miniaturized digital phase shifter, and belongs to the field of RFIC digital phase shifters. The dual-band miniaturized digital phase shifter comprises a switchingcircuit, an inductor structure with a variable coupling coefficient and two variable capacitor units, phase shift of input signals and output signals is achieved by switching on-off states of a firstswitch tube and a second switch tube in a switch circuit, coupling coefficients of a first inductor, a second inductor and a third inductor are changed by switching on-off states of a third switch tube in an inductor structure, and double frequency bands are achieved. According to the dual-band miniaturized digital phase shifter provided by the invention, an inductor structure with a variable coupling coefficient is adopted, dual bands are realized, and the two working bands can be mutually crossed or independent; meanwhile, the insertion loss of the phase shifter is reduced, the phase shift precision of the phase shifter in the embodiment is smaller than + / -0.37 degree, and the insertion loss is smaller than 3dB.

The invention discloses a broadband multilayer microstrip Butler beamforming network matrix device, and belongs to the technical field of electronic communication in order to solve the defects, such as a narrow operating frequency, a large port phase shift error, and poor port amplitude flatness, of a current Butler matrix. The broadband multilayer microstrip Butler beamforming network matrix device is easy to manufacture, low in cost, high in port phase shift accuracy, small in port amplitude fluctuation, low in loss, wide in operating frequency and high in port isolation degree, can meet therequirements of modern civilian mobile communication systems and military radar systems for new-generation multi-beam array antennas and antenna testing.

A digital three-phase shifting triggering IC contains three comparator circuits, a debouncing circuit, three phase shifting circuits, three pulse width generating circuits, three output driving circuits and a open-phase protection circuit. Said invention adopts digital control method to control accuracy shift triggering of thyristor and raises phase shifting precision and symmetry degree, circuit stability and reliability, and reduces products complexity and separation degree.

The invention discloses an active amplitude-phase control circuit, which includes an orthogonal generator, a phase shift and amplitude modulation unit, an amplitude controller DAC and a phase controller DAC, and is characterized in that the phase shift and amplitude modulation unit includes a phase shift unit and an amplitude modulation unit; the amplitude controller DAC includes an amplitude control circuit and a first decoder, and the phase controller DAC includes a phase control circuit and a second decoder; an amplitude control circuit is used for amplifying first reference current and converting the current into two paths of current signals, and then converting the two paths of current signals into two paths of voltage control signals to output to the amplitude regulation unit; the phase control circuit is used for amplifying second reference current and converting the current into two paths of current signals, and then converting the two paths of current signals into four paths of voltage control signals to output to the phase shift unit; the phase shifting unit is used for amplifying the four paths of voltage control signals output by the orthogonal generator, then combining into two paths of differential signals to output to amplitude modulation unit, and thereby achieving 360-degree phase shift.

The invention discloses an improved switch line type phase shifter. Three improved switch phase shifting structures are provided for the problems of high insertion loss and low phase shifting precision of an existing switch line type phase shifter, a PIN diode switch and a microstrip line branch connector in the existing switch line type phase shifter are subjected to structure optimization to achieve the purposes of insertion loss of the phase shifter and improve the phase shifting precision and power capacity. The phase shift stability and precision are high, the phase shift quantity is notchanged along with a signal level; and the insertion loss is small, the port standing wave is small, the phase shifting speed is fast, and the required control power is small. The improved switch linetype phase shifter is an important component of a phased array antenna transmitting / receiving component, and the phase of each radiating unit on the aperture surface of the antenna is electrically controlled so as to achieve beam scanning.

The invention discloses a micro electronic mechanical system (MEMS) load line type 2-bit phase shifter based on a left-handed transmission line, and particularly relates to an MEMS load line type 2-bit phase shifter in order to solve the problems of small phase shift amount and large switching quantity of MEMS switches in the 2-bit phase shifter. A microstrip line comprises a ground plate, a base and a signal wire, wherein a metal layer is covered on the ground plate; the signal wire is fixed on the upper surface of the base and positioned at a middle position of the base along the width direction, and is divided into four sections, and each two adjacent sections are electrically connected with each other through a phase-shifting unit; the phase-shifting unit comprises stub lines, an interdigital capacitor, MEMS switches and a cylindrical metal through hole; and a stub line and an MEMS switch are arranged at two ends of the interdigital capacitor respectively, one end of the stub line is connected with the center of one end of the interdigital capacitor, and a cube contact point is arranged in the middle of the lower surface of a bridge of the MEMS switch and is suspended above the stub line. The MEMS load line type 2-bit phase shifter is used for controlling phase changes of signals.

The invention discloses a hybrid MEMS phase shifter, so as to solve problems of large phase shifter chip area, poor phase shift precision and low process tolerance in the prior art. The hybrid MEMS phase shifter comprises a base, a microstrip transmission line grounding line arranged at the bottom part of the base, a phase delay network, a phase reference network, and power distributors for being connected with the phase delay network and the phase reference network, wherein the power distributors are connected with the phase delay network and the phase reference network via single-pole single-throw switches or single-pole double-throw switches; each of the phase delay network and the phase reference network is composed of one or more MEMS variable capacitors and two connection transmission lines connected with two sides of the MEMS variable capacitors respectively and connected with parallel-type MEMS switches, and the single-pole single-throw switches or single-pole double-throw switches are the parallel-type MEMS switches. The switched-line phase shifter and the distributed phase delay network structure are combined, and advantages that the reference network and the delay network have high isolation, and phase shift is simulated and adjustable in a small range.

The invention discloses a linear displacement measurement system based on an alternating light field. The system comprises a light emitting element, a fixed scale substrate, a movable scale substrate,a photoelectric detector and an electronic signal processing circuit, wherein a row of fixed scale illuminating surfaces are arranged on the fixed scale substrate, the light emitting element comprises an alternating light source, the alternating light source is driven by an alternating excitation signal to form a single alternating light field, four rows of movable scale illuminating surfaces arranged on the movable scale substrate are completely covered by the single alternating light field in a direction perpendicular to the alternating light source, the photoelectric detector comprises four photoelectric detection heads, and the four photoelectric detection heads can receive all luminous flux of the four rows of movable scale illuminating surfaces independently at the same time. The light emitting element, the photoelectric detector and the movable scale substrate can move together relative to the fixed scale substrate, four photoelectric current signals output by the four photoelectric detection heads are input to the electronic signal processing circuit, and after processing is conducted, a linear displacement value of the movable scale substrate relative to the fixed scale substrate is obtained. By means of the linear displacement measurement system based on the alternating light field, precise linear displacement measurement can be achieved, meanwhile, the measurement system size is reduced, and integration is more facilitated.

This invention discloses a method for precisely shifting phases and a phase-shifter, first of all, which cuts a HF input signal in a counter, which outputs a low frequency square wave signal to be shifted, secondly outputs a two double frequency square wave signal of the being shifted signal, thirdly switches the HF input signal and the two double frequency square wave signal in a preset counter to output a phase-shift square wave labeling square wave and fourthly switches the shift labeling square wave and the low frequency signal to be shifted in a trigger to output the shifted low frequency square wave to finish the phase shift. Device realizing said method include a counter and preset counter and a trigger.

The invention discloses a hybrid broadband high-precision phase shifter integrated circuit, which belongs to the technical field of radio frequency integrated circuits, and is formed by cascading a pi-type L-C phase shift unit, a 22.5-degree switch-type phase shift unit, a 45-degree switch-type phase shift unit, a broadband quadrature signal generator, a quadrant selection unit and a transformer.The pi-type L-C phase shift unit is used for realizing 5.625-degree and 11.25-degree phase shift states; the two switch type phase shift units respectively realize 22.5-degree and 45-degree phase shift states, the quadrature signal generator is used for synthesizing a pair of quadrature differential signals, and the quadrant selection unit switches the positive and negative polarities of the quadrature signals through a switch to realize a 360-degree phase shift range. Compared with a traditional switch type phase shifter, the hybrid phase shifter has the advantages of being wide in band, lowin insertion loss, high in precision and the like.

The invention provides a particle playground measuring device and a measuring method based on digital micro-mirror plane structured light illumination. The particle playground measuring device is characterized in that parallel light after collimation and beam expanding is reflected by a digital one-dimensional periodic optical grating generated by a DMD (digital mirror device) and forms plane structured light to illuminate a particle playground by sequentially passing through a first cylindrical lens, a filter and a second cylindrical lens, and finally the light is scattered by the particle playground and collected by an image sensor to form an imaging pattern; the DMD and the image sensor are synchronously triggered and controlled by adopting a computer to control a synchronous controller, the digital one-dimensional periodical optical grating is controlled by the DMD to generate the phase shift of 0, 2pi / 3 and 4pi / 3, three patterns with the phase shift of 0, 2pi / 3 and 4pi / 3 are sequentially collected through the image sensor, the collected interference pattern is processed by the computer, and the phase distribution of a to-be-detected object can be acquired. The method and the device have the characteristics of high response speed, stability in phase shift, convenience in use and the like.

One embodiment of the invention discloses a broadband six-bit MMIC numerical control phase shifter. The phase shifter comprises a 5.625-degree phase shifting unit, a 11.25-degree phase shifting unit, a 22.5-degree phase shifting unit, a 45-degree phase shifting unit, a 90-degree phase shifting unit and a 180-degree phase shifting unit. The 5.625-degree phase shift unit adopts a series inductance parallel switch structure; the 11.25-degree phase shift unit, the 22.5-degree phase shift unit and the 45-degree phase shift unit adopt T-shaped phase shifter structures; the 90-degree phase shift unit adopts a reflection type structure composed of a Lange coupler and a reflection terminal; and the 180-degree phase shift unit adopts a structure of a balanced-unbalanced converter and a single-pole double-throw switch.