50results about How to "Guaranteed Phase Consistency" patented technology

The invention provides an image data transmission circuit of a satellite-borne high-resolution CCD (Charge Coupled Device) camera, relating to the technical field of aerospace optical remotely-sensed imaging technology and solving the problem that the performance of the data transmission circuit is reduced after data transmission because the transmission of image data of a single channel of the traditional satellite-borne CCD remote sensing camera needs coordination of a plurality of differential driver integrated circuits. The image data transmission circuit comprises a high-speed serial differential transmitting circuit at a transmitting end and a high-speed serial differential receiving circuit at a receiving end. The high-speed serial differential transmitting circuit receives image data, line synthesizing signals and data clock output by a satellite-borne high-resolution CCD; the image data, the line synthesizing signals and the data clock are subjected to parallel-serial conversion and differential driving through a high-speed LVDS (Low Voltage Differential Signaling) serializer to output four groups of high-speed serial LVDS signals; and the four groups of LVDS signal flows are transmitted to the high-speed serial differential receiving circuit through an LVDS transmission cable. By means of the image data transmission circuit provided by the invention, the size, the weight and the power consumption of a data transmission link of the satellite-borne high-resolution CCD camera are reduced, and the quality of image transmission is effectively ensured.

The invention provides an extensible microphone array and an establishment method thereof. A synchronous sampling mechanism between chips is adopted, and adc synchronous sampling of the chips is controlled through a gpio, so that a phase difference of multi-channel adc data is ensured to be within 1 microsecond, and synchronous operation of the chips is guaranteed; each chip independently completes noise reduction, echo cancellation or a beam forming algorithm of the double microphones, so that the system overhead can be effectively dispersed, and the load of the whole system is reduced; audiodata processed by a single slave chip is cascaded and transmitted to a main chip to complete algorithm processing of the microphone array, the system is expanded to any number of microphone arrays through cascading, and meanwhile, the chips form the microphone array, so that compared with a single-chip multi-adc scheme, the cost is lower and the expansibility is more flexible.

The invention discloses a spherical antenna near-field calibration and scanning method and system and a terminal, and belongs to the technical field of antenna tests. The channel calibration comprises the steps that space coordinates and orientation information of all channels in a spherical antenna on a spherical surface are obtained, and then the spherical coordinate mapping relation between all the channels and a six-axis mechanical arm is calculated; the six-axis mechanical arm carrying the test probe is controlled to move to each channel of the spherical antenna; amplitude and phase data of each channel are collected, an amplitude and phase data compensation table is obtained, and then amplitude and phase compensation processing is carried out on the corresponding channel in the beam combining process. By calculating the spherical coordinate mapping relationship between each channel and the six-axis mechanical arm, the six-axis mechanical arm can realize accurate spherical motion, and the test accuracy is ensured; amplitude and phase compensation processing is carried out on the corresponding channels in the beam forming process through the amplitude and phase data compensation table so as to meet the requirement for equal amplitude and equal phase of beam forming, the amplitude and phase consistency of each channel is effectively guaranteed, and then the method can adapt to high-frequency-band antenna testing.

This invention discloses a multichannel arbitrary waveform generating system. The generating system comprises a computer control module, a precise time sequence generating component and an arbitrary waveform generator; the precise time sequence generating component comprises an outer reference clock, a clock and multi-frequency signal encoding module and a data flow light fan-out module which are connected sequentially; the data flow light fan-out module is connected with the arbitrary waveform generator; the computer control module is connected with the arbitrary waveform generator, the clock and multi-frequency signal encoding module, and the data flow light fan-out module; and the arbitrary waveform generator can be used independently, and also can be extended according to the requirement to form an array of dozens of arbitrary waveform generators. By utilizing the generating system provided by this invention, the data flow containing a clock signal, a menu signal, a time delay signal and so on, is transmitted at a high speed in the form of light; thus, the delay-controllable and picosecond-jittering high-speed arbitrary waveforms with optional repeated frequencies can be outputted in multiple channels.

The invention relates to a high-precision angle measurement method of an automotive anti-collision radar based on an interference theory, belonging to the technical field of radar communication and the automotive electronics. The high-precision angle measurement of the automotive anti-collision radar of the invention is based on the interference theory of long baseline/short wavelength and co-prime wavelength, multiple groups of radar receiving and transmitting devices are used in the method, each group of transmitters provides a common-source, in-phase and uniform-amplitude local oscillator signal for the corresponding receivers thereof, and simultaneously, the group of receivers is composed of approximately same components; corresponding antennae of each group of receivers receive the same echo to form an interference signal, distinguish the generated phase difference and output the processing result to a digital phase processing module; and the processed multiple channel signals are transmitted in a signal transmitting mode that the transmitters transmit the co-prime wavelength/frequency, and direction angle deblurring is realized based on the inference theory, thus, the high-precision direction angle is obtained.

The invention belongs to the technical field of microwave communication, and particularly relates to an E-plane waveguide directional coupler and a 16-way waveguide power divider applying the coupler. The coupler comprises a first rectangular waveguide and a second rectangular waveguide which are constructed by E-plane coupling; and a ladder-shaped section for realizing a broadband phase supplementation function is arranged on the second rectangular waveguide, so that the low-amplitude volatility of each output port of a power divider with a high power division rate can be ensured. The 16-way waveguide power divider applying the coupler comprises two groups of waveguide E-plane power dividers, wherein a first E-plane waveguide directional coupler is arranged between the last-stage E-T branch waveguide of the first waveguide E-plane power divider and the previous three stages of power dividing networks, and a second E-plane waveguide directional coupler is arranged between two groups of waveguide E-plane power dividers, so that the amplitude uniformity and phase uniformity of the 16-way power divider can be effectively improved, the problem of large amplitude fluctuation of the power divider with a large power division rate can be synchronously solved, and a broadband designing requirement can be realized.

The invention belongs to the technical field of communication, and relates to a large-scale MIMO antenna comprising a reflection plate, a calibration network arranged on one side of the reflection plate and N*M antenna subarrays arranged on the side of the reflection plate away from the calibration network, wherein N is a positive integer greater than or equal to 1 and M is a positive integer greater than or equal to 2. The antenna subarrays comprises a power dividing plate and a radiation unit arranged on the power dividing plate. The power dividing plate has a microstrip line structure. Thecalibration network has a microstrip line structure or a strip-line structure. The thickness of the reflection plate is 1.5mm-3mm. The antenna subarrays are connected with the calibration network through a probe. The antenna subarrays and the calibration network are respectively connected with the reflection plate through metal screws, and at least one metal screw is arranged around the probe. Theantenna subarrays, the calibration network and the reflection plate are modularized so that detection, maintenance or replacement of a single module can be facilitated; besides, at least one metal screw is directly grounded around the feeding probe so that the antenna signal transmission is good.

The invention belongs to the technical field of microwave communication, and particularly relates to a 32-channel waveguide E-plane power divider. The 32-channel waveguide E-plane power divider comprises two groups of 16-channel sub-power dividers which are in left and right mirror distribution, wherein each 16-channel sub-power divider comprises a first waveguide E-plane power divider and a second waveguide E-plane power divider; each first waveguide E-plane power divider is provided with a first E-plane waveguide directional coupler; a second E-plane waveguide directional coupler is arranged between each first waveguide E-plane power divider and the corresponding second waveguide E-plane power divider; a third E-plane waveguide directional coupler is connected with each first E-plane waveguide directional coupler and the corresponding second E-plane waveguide directional coupler; each E-plane waveguide directional coupler comprises a first rectangular waveguide and a second rectangular waveguide of an E-plane coupling structure; and each second rectangular waveguide is provided with a ladder stage for achieving a broadband phase compensation function. The 32-channel waveguide E-plane power divider has the advantages of a high broadband, a high power dividing ratio, a small amplitude fluctuation and good phase consistency; and the amplitude consistency and the phase consistency of an existing 32-channel power divider can be effectively improved.

The invention discloses a radio-frequency cable assembly phase consistency assembling method. The radio-frequency cable assembly phase consistency assembling method comprises the following steps: (1)assembling a first radio-frequency cable assembly, adopting the first radio-frequency cable assembly as a reference, and performing the test by using a vector network analyzer; (2) producing a secondradio-frequency cable assembly, and assembling one end of the second radio-frequency cable assembly and the first radio-frequency cable assembly by virtue of a connector; (3) performing the single-channel test by virtue of the vector network analyzer, comparing with the first radio-frequency cable assembly, and obtaining a phase difference; (4) trimming the other end of the second radio-frequencycable assembly, wherein the trimming coefficient is D; (5) calculating a trimming length Cmm, wherein C is equal to D multiplied by the phase difference; and (6) repeating the steps (2) to (5), and completing the assembling, test, calculation and trimming of other radio-frequency cable assemblies. According to the radio-frequency cable assembly phase consistency assembling method, by combining thecurrent processing and test technology of the radio-frequency cable assembly, the phase consistency of assemblies can be effectively ensured, the qualification rate of the phase consistency match iskept at more than 80 percent, and the mass production can be facilitated.

The invention relates to the technical field of heat dissipation for satellite-borne phased array equipment, and discloses a method for integrating and mounting satellite-borne TR assembly arrays withhigh heat flux density. The method includes procedures of clamping a high-speed uniform-temperature heat conduction heat pipe between every two TR assemblies, leading out the corresponding TR assemblies at two ends of each heat pipe and forming independent TR assembly modules; arranging U-shaped left hoops and U-shaped right hoops for integrating and mounting the independent TR assembly modules;integrating the corresponding N independent TR assembly modules by each left hoop and the corresponding right hoop. The N is a natural number larger than 1. The technical method has the advantages that TR assembly array integrated heat dissipation systems are used in satellite-borne platforms by the aid of the method for the first time; the problems of internal volume and weight restriction and the like of satellite-borne phased array antennas can be solved by the aid of the method; integral satellite-borne phased array antennas have the total heat dissipation capability of 200 W under the condition that temperature intervals ranging from 35 DEG C to 55 DEG C are provided on heat sink surfaces, the temperatures are not higher than 85 DEG C all along after heating chips in the TR assembliesare in stable states, and accordingly the phase congruency of phase units can be guaranteed.

The invention discloses a Ka frequency band standardized four-channel transmitting assembly. The assembly comprises a power supply part and a radio-frequency signal modulation part, a data bit and a power supply modulation circuit are used for power supply control, an external chip selection signal is combined, and independent and controllable single channel is realized; meanwhile, a phase-shift attenuation multifunctional chip is used as an amplitude-phase control device; smooth transmission of various functions of the transmitting module is ensured, the anti-interference capability and the negative electricity protection function of the product are both considered, the overall internal transmission network is globally optimized, standardized design of the module size is realized, the production cost is low, and a radar array plane can be formed by regular splicing, arrangement and combination.

The invention relates to a power amplifier with an electrostatic discharge protection circuit. A core circuit uses a NMOS (N-channel metal oxide semiconductor) tube stacking structure; source electrodes and drain electrodes of three NMOS tubes are sequentially connected. Each NMOS tube is in bias arrangement in AB type; tandem resistors form a bias circuit. The electrostatic discharge protection circuit uses a distributed electrostatic discharge protection structure; the schematic diagram is shown as Figure 1; a diode in the protection circuit uses a PN junction diode; each electrostatic discharge protection unit uses the same diode; the diodes in parallel connection are connected through CPW (coplanar waveguide); the electrostatic discharge protection degrade of the core radio frequency power amplifier can be effectively improved; the parasitic effect of the protection circuit is weakened; the power amplifier is applicable to high work frequency.

The invention provides a long-distance distributed large-dynamic microwave optical fiber stable-phase transmission system which comprises a main signal light-emitting module, a reference light receiving and transmitting module, an amplitude-phase monitoring and control module, a delay compensation module, a dispersion compensation and light amplification module, a signal return module and a main signal light receiving module, wherein the amplitude-phase monitoring and control module further comprises a reference signal unit, an amplitude-phase monitoring unit and a compensation control unit; the reference signal unit adopts a variable frequency signal source; and the amplitude-phase monitoring unit directly performs phase discrimination and amplitude monitoring among the reference signalsreturned by each sub-station. According to the invention, the reference signal unit can change the frequency of the reference signal in real time, so as to obtain higher phase monitoring precision; the amplitude-phase monitoring unit directly carries out phase discrimination and amplitude monitoring on the reference signals returned by the sub-stations, only relative compensation between the sub-stations needs to be carried out, the compensation range requirement of the delay compensation module is lowered, and meanwhile the complexity degree and cost requirement of the system are lowered.

The invention discloses a high-frequency eccentric vibration acoustic wave power head for a drilling machine, and belongs to the field of audio frequency drilling machines. The high-frequency eccentric vibration acoustic wave power head for the drilling machine comprises a main frame, a spindle rotating mechanism, a spindle vibrating mechanism and a bearing cooling lubricating system. Structurally, a spindle and a spindle hydraulic motor adopt spline structures for transmission connection, the spindle is rotationally connected into a spindle box, the spindle box is mounted in the main frame inthe mode of hanging in air through a vibration isolator, high-frequency vibration is generated through two sets of eccentric vibration mechanisms in the spindle box, thus the acoustic wave power headis more compact and more reasonable in structure, and spindle rotation and axial vibration movement are more stable and more reliable; and meanwhile a vibrator shaft bearing is cooled and lubricatedby lubricating oil through a lubricating oil circulation control system, the working temperature of the vibrator shaft bearing is greatly decreased, the service life of the bearing is prolonged, thusthe eccentric-vibration-type acoustic wave power head can work at a higher vibration frequency, and the working efficiency of the acoustic wave power head is further improved.

The invention relates to a high-precision active power splitting assembly. The active power splitting assembly comprises a radio frequency amplification power splitting circuit, a coupling detection circuit and a DC-DC conversion circuit, wherein the radio frequency input end of the radio frequency amplification power splitting circuit is connected with a radio frequency input signal, and the output end of the radio frequency amplification power splitting circuit outputs a radio frequency signal, and is connected with the input end of the coupling detection circuit; the output end of the coupling detection circuit outputs a fault detection alarm signal; the output end of theDC-DC conversion circuit is connected with the radio frequency amplification splittingcircuit and the coupling detection circuit; the input end of the DC-DC conversion circuit isan external power supply port of the assembly. According to the invention, the sizeof the assemblyis greatly reduced, the standing wave ratio, harmonic suppression ratio, clutter suppression ratio, in-band fluctuation and isolation index of each output port of the whole assemblyare effectively improved, the amplitude and phase consistency and stability of output signals are ensured, and meanwhile, the anti-total reflection performance of each output port of the assemblyis improved.

The invention discloses a method for keeping a consistent phase of a frequency division clock and a frequency division circuit. The method comprises the following steps: communicating a D input end of the last stage register of a first frequency divider with the D input end of the last stage register of a second frequency divider, wherein the first frequency divider is located at the outside of a curing module, and the second frequency divider is located in the curing module; performing frequency division on a source clock signal through the first frequency divider and the second frequency divider, outputting a first frequency division signal from a Q output end of the last stage register of the first frequency divider, and outputting a second frequency division signal from the Q output end of the last stage register of the second frequency divider, wherein the phase of the first frequency division signal is consistent with the phase of the second frequency division signal.

The invention discloses an automatic test device and a test method for a multi-beam assembly. The device comprises an input radio frequency distribution module and an output radio frequency distribution module. The input radio frequency distribution module and the output radio frequency distribution module are provided with a radio frequency connector connected with a test instrument and a control interface connected with a control host outside, and a radio frequency signal distribution circuit for dividing a radio frequency signal into multiple parts is arranged in the input radio frequency distribution module; the output radio frequency distribution module comprises a radio frequency signal synthesis circuit for combining multiple radio frequency signals into one inside, and each branch of the radio frequency signal distribution circuit and the radio frequency signal synthesis circuit is provided with a control switch. The automatic test device for the multi-beam assembly, provided by the invention, is low in cost, small in size and easy to use, can realize synchronous control of the test instrument, the radio frequency distribution module and the tested assembly, and can complete performance tests of all channels through one-time installation and one key.