47results about How to "Achieving Phase Compensation" patented technology

The invention discloses a phase compensation method for a frequency conversion time delay calibration system. The method includes the following steps: sending a continuous wave source signal, dividing the continuous wave source signal into a first continuous wave sub-signal and a second continuous wave sub-signal, adjusting the power of the first continuous wave sub-signal and the power of the second continuous wave sub-signal respectively, sending a first local oscillator signal and a second local oscillator signal, acquiring a first intermediate frequency signal and a second intermediate frequency signal through frequency mixing, acquiring a first set of data samples and a second set of data samples through sampling, acquiring a third set of data samples and a fourth set of data samples through the Hilbert transform, acquiring the phase difference between the first intermediate frequency signal and the second intermediate frequency signal through calculation, sending a third local oscillator signal and a fourth local oscillator signal, acquiring a third intermediate frequency signal and a fourth intermediate frequency signal through frequency mixing, acquiring a fifth set of data samples and a sixth set of data samples through sampling, acquiring a seventh set of data samples and an eighth set of data samples through the Hilbert transform, and acquiring the phase difference between the third intermediate frequency signal and the fourth intermediate frequency signal through calculation.

The invention discloses a broadband Doherty power amplifier, comprising a power divider, a main power amplification network, an auxiliary power amplification network and a broadband compensation network. The broadband compensation network is the compensation network which is composed of a capacitor, an inductor, a resistor and a microstrip and has a special structure. According to the broadband compensation network, a phase compensation effect can be achieved in a relatively wide band, a signal can be amplified efficiently in a relatively wide frequency range, the relatively high backoff efficiency is achieved in the band, and in particular, the ultrahigh efficiency is achieved at a 6dB power backoff position. Through adjustment of parameters of the compensation network, the broadband Doherty power amplifier can be generalized to the Doherty power amplifiers of other bands, and the broadband Doherty power amplifier has wide application prospect and practical value.

The present invention discloses a wide area measurement-based PSS4B parameter adjusting and adapting method. The method comprises the steps of 1 obtaining the real-time operation parameters of a power grid based on a wide area measurement technology, analyzing the power grid to measure the online uncompensated frequency response characteristics of the excitation systems, comparing and determining that a power system stabilizer (PSS) needs to compensate the phase difference; 2 aiming at the excitation systems having the larger uncompensated frequency response characteristic difference, and according to the data of the current system, adopting an SCE-UA algorithm to set the partial parameter of a PSS4B of an important generator set, thereby compensating the phase of the system. The method of the present invention mainly solves the problem that a PSS4B constant value model is insufficient in adaptability to different power grid scales, adopts the SCE-UA algorithm to set the PSS4B parameter of the important generator set by considering that the PSS4B model is many in model parameters and is not easy to adjust, and enables the system damping to be improved all in the high middle and low frequencies as much as possible, thereby adapting the frequency response characteristic of the current excitation system.

The invention discloses a high-linearity Doherty power amplifier implemented by a double-negative ferroelectric material. The high-linearity Doherty power amplifier comprises a main power amplifier module and an auxiliary power amplifier module which are connected in parallel, wherein an input end of the main power amplifier module corresponds to an input end of the Doherty power amplifier; an output end of the auxiliary power amplifier module corresponds to an output end of the Doherty power amplifier; a phase-shifting module is connected in series between an input end of the auxiliary power amplifier module and a main input end of the Doherty power amplifier; a double-negative ferroelectric structure for compensating for AM-PM distortion of the auxiliary power amplifier module under a high power condition is connected in series between an output end of the main power amplifier module and a main output end of the Doherty power amplifier; and an adjustable direct-current bias is introduced into the double-negative ferroelectric structure. Through adoption of the high-linearity Doherty power amplifier, an electromagnetic bandgap property and a slow-wave effect of the double-negative ferroelectric material structure are utilized, so that a required phase can be obtained by adjustment of the double-negative ferroelectric structure.

The invention discloses a 10MHz-8GHz miniaturization bridge unit characterized by comprising an excitation signal input port P1; the excitation signal input port P1 is connected with one end of a winding b; the winding b and a winding a form a twisted pair winding on a magnet ring, and the magnet ring is also winded by a winding c; one ends, close to the excitation signal input port P1, of the windings a and c are connected and grounded; the other ends of the windings b and c are respectively connected between a resistor R2 and a resistor R3; the other end of the resistor R2 is connected with a resistor R1; an isolation port P2 is arranged between the resistors R1 and R2; the other end of the resistor R1 is connected with a test port P3; the other end of the winding a is connected between the resistor R1 and the test port P3. The 10MHz-8GHz miniaturization bridge unit can solve the problems that the application frequency of an existing twisted pair transmission line magnet ring orientation bridge is hard to raise.

The invention discloses a phase compensation circuit of an ultra wide band multi-path frequency conversion link, which comprises a temperature sensor, a memory, a logic controller, a digital phase shifter and a driver, and is characterized in that the temperature sensor and the memory are connected with the logic controller; the logic controller controls the driver through the control code; and the driver is connected with a digital phase shifter arranged in the local oscillator circuit. According to the phase compensation method, a logic controller is adopted as a core, temperature information of a temperature sensor is read and combined with frequency code information provided by a system, control code data programmed in advance in a memory are read, and a digital phase shifter located in a local oscillator link is controlled to adjust phase consistency of a broadband frequency conversion link. According to the invention, the digital phase shifter is adopted for compensation in a local oscillator link, the compensation precision is high, and parasitic amplitude modulation generated during phase shifting is small; frequency codes and temperature information are combined to carry out digital phase shift compensation, and phase compensation under ultra-wideband and full-characteristic temperature conditions is realized.

The invention discloses a metasurface-based Gregory antenna, and mainly aims to solve the problems that the existing Gregory antenna is high in phase error, complex in structure, and long in focal length. The metasurface-based Gregory antenna comprises a carrier (1), a main reflecting mirror (2), an auxiliary reflecting mirror (3), a feed source (4) and a supporting structure (5); the carrier adopts a convex structure; the main reflecting mirror is conformal with the carrier; each of the main reflecting mirror and the auxiliary reflecting mirror adopts a phase change metasurface structure established based on generalized Snell law, wherein the auxiliary reflecting mirror is located above the focal point of the main reflecting mirror and has an ellipsoid characteristic phase, and is used for focusing the electromagnetic waves emitted by the feed source to a perifocus of the auxiliary reflecting mirror; the main reflecting mirror and the auxiliary reflecting mirror are connected throughthe supporting structure; and the perifocus of the auxiliary reflecting mirror coincides with the focal point of the main reflecting mirror, and the over focus coincides with the phase center of the feed source. By virtue of the metasurface-based Gregory antenna, the focal length of the Gregory antenna can be shortened, wave beam calibration can be realized; and meanwhile, the antenna phase compensation error is lowered, the structure is simple, and the antenna can be used for communication and radar.

The invention discloses a metasurface-based convex conformal Gregory antenna, and mainly aims to solve the problems that the existing antenna is high in phase error, complex in structure, and hard torealize convex Gregory wave beam calibration. The metasurface-based convex conformal Gregory antenna comprises a carrier (1), a main reflecting mirror (2), an auxiliary reflecting mirror (3), a feed source (4) and a supporting structure (5); the carrier adopts a convex structure; the main reflecting mirror is conformal with the carrier; each of the main reflecting mirror and the auxiliary reflecting mirror adopts a phase change metasurface structure established based on generalized Snell law, wherein the auxiliary reflecting mirror is located above the focal point of the main reflecting mirrorand has an ellipsoid characteristic phase, and is used for focusing the electromagnetic waves emitted by the feed source to a perifocus of the auxiliary reflecting mirror; the perifocus of the auxiliary reflecting mirror coincides with the focal point of the main reflecting mirror, and the over focus coincides with the phase center of the feed source; and the main reflecting mirror and the auxiliary reflecting mirror are connected through the supporting structure. By virtue of the metasurface-based convex conformal Gregory antenna, wave beam calibration of the convex conformal Gregory antennacan be realized; and meanwhile, the antenna phase compensation error is lowered, the structure is simple, and the antenna can be used for communication and radar.

The invention discloses a multi-color super-resolution imaging system applied to a 4pi microscopic structure. The multi-color super-resolution imaging system comprises a light source module, a sampletable, an upper microscope lens, a lower microscope lens, a first quarter-wave plate, a second quarter-wave plate, a first dichroscope, a second dichroscope, a first light path reflex matching unit, asecond light path reflex matching unit, a first deformable mirror, a second deformable mirror, a first Babinet's compensator, a second Babinet's compensator, a beam splitter cube, a third light pathreflex matching unit, a fourth light path reflex matching unit, a polarization beam splitter cube, an eleventh reflector, a twelfth reflector, a ninth lens, a tenth lens, a rectangular prism, a thirddichroscope, an eleventh lens, a twelfth lens, a first imaging device and a second imaging device. According to the system, the unimolecule positioning technology and crosstalk among different fluorescent molecules are utilized, and in combination with the 4pi microscopic technology, multi-color three-dimensional super-resolution imaging of whole cells is achieved.

The invention relates to a multi-channel wireless signal transceiver, which comprises a high-gain antenna device, an antenna switch device, a signal processing device and a controller. The high-gain antenna device comprises a substrate and two or more high-gain dual-polarization log-periodic antennas; the number of the antenna switching devices is the same as that of the signal processing devices, and the number of the antenna switching devices is two or more than two. The high-gain dual-polarization log-periodic antenna comprises an antenna body, an antenna oscillator, a first coaxial line, a second coaxial line and a lens. According to the high-gain dual-polarization log-periodic antenna, dual polarization of the two single-polarization antenna units is achieved through the cross structure, signal polarization loss can be reduced, gain of the antenna in the horizontal direction and the vertical direction is good, the lens is arranged on the antenna body so that non-uniform spherical waves of the antenna can be compensated and corrected through the lens, and uniform spherical waves are obtained. Therefore, the phase compensation of the antenna waveform is realized, the overall gain of the antenna is further improved, and the use reliability is high.

The invention discloses an anti-vibration crystal oscillator, and the crystal oscillator adopts a closed-loop compensation framework based on a digital circuit to realize high-precision compensation of the crystal oscillator. Firstly, an output signal of an acceleration compensation crystal oscillator is divided into two paths by a power divider: one path is outputted, and the other path is sent to a phase detector to extract a phase signal, is converted into a phase value in a binary coding form by an analog-to-digital converter, and then is transmitted into a microprocessor; a pre-stored phase value-compensation voltage value binary coding table is used for looking up a table to obtain a binary code of a required compensation voltage value, and then the binary code of the compensation voltage value is converted into a required compensation voltage by a digital-to-analog converter, and the required compensation voltage is inputted to the voltage control end of the voltage-controlled crystal oscillator, so the oscillator outputs a signal with a stable phase and finally acceleration compensation is realized, and the problem of phase error caused by inconsistency and asynchronism ofacceleration acquired by a sensor and real-time acceleration of a resonance wafer in the conventional acceleration compensation crystal oscillator is solved.

The invention discloses a semiconductor laser based on a distributed phase compensation technology, and relates to the field of optical fiber communication and photon integration. The semiconductor laser comprises a metal n electrode, a buffer layer, a lower respective limiting layer, a light-emitting active layer, an upper respective limiting layer, a corrosion barrier layer, a grating layer, a waveguide layer, a transition layer, a p-type ohmic contact layer, a metal p electrode, a high-reflection film and an anti-reflection film. The high-reflection film and the anti-reflection film are arranged at the two ends of the semiconductor laser respectively, so that the energy utilization rate and the output power of the semiconductor laser are improved; and electrical isolation is formed by etching the waveguide, the semiconductor laser is divided into two or more sections, and the current injection distribution of each section is changed, so that the random reflection phase brought by the high-reflection coating can be effectively compensated, the problem of unstable lasing mode caused by the random reflection phase is solved, and the micro regulating and control of wavelength can be realized.