45results about How to "Guaranteed coherence" patented technology

The invention relates to a system and method for self-defining drama of a network game. The system comprises a game drama setting module, a game drama prompt module, a game drama database, a data drama selection module and a player client side. Game drama options are provided for a player, and accordingly the game drama is richer. The invention further relates to the method for self-defining the drama of the network game based on the system. According to the method, the consistency of game pictures is guaranteed, the game drama requirement of the player at each game drama branch point is judged at the same time, and the more human-friendly game setting method with rich drama is provided. The designed network game designed through the system and method is more interesting, and the game requirements of various players are met.

The invention discloses an MIMO radar detection method based on double optical frequency combs and difference frequency multiplexing. According to the method, an existing MIMO radar detection technology based on microwave photon orthogonal difference frequency multiplexing is improved, and M paths of modulated optical signals of a transmitting end are generated through the following method: firstly, an optical carrier is divided into an upper path and a lower path; The local oscillator signal is used for carrying out modulation processing on the uplink optical carrier wave to generate a firstoptical frequency comb signal, and the intermediate frequency signal and the intermediate frequency linear frequency modulation signal are used for carrying out modulation processing on the next optical carrier wave to generate a second optical frequency comb signal; After the first optical frequency comb signal and the second optical frequency comb signal are coupled into one path, the first optical frequency comb signal and the second optical frequency comb signal are divided into M paths of modulated optical signals respectively consisting of a single intermediate frequency linear frequencymodulation spectrum line and a single local oscillator signal spectrum line through beam shaping filtering. The invention also discloses an MIMO radar detection device based on the double optical frequency combs and the difference frequency multiplexing. According to the invention, the structure of the transmitter can be greatly simplified, the implementation cost of the system is reduced, and the coherence between signals can be effectively ensured.

The invention discloses a THz radar transmitting/receiving front end, which comprises a dot frequency source unit, an intermediate frequency local oscillator generating unit, a first upper mixing unit, a second upper mixing unit and a linear sweep frequency unit. According to the THz radar transmitting/receiving front end, a THz radar transmitting link and a THz radar receiving link are respectively driven by using two incoherent sources, and the problem that a single signal source under a THz frequency band is difficult to drive the transmitting link and the receiving link simultaneously is solved; and moreover, a coherent system is realized through an incoherent source, the problem that the receiving signals generated by two signal sources have asynchronous phases is solved, and a linear frequency modulation continuous wave (LFMCW) sweep frequency signal is rapidly provided; and therefore, centimeter-sized range resolution of an object can be realized.

The invention discloses a polarization multiplexing microwave photon radar detection method and system based on photon sampling. The detection method comprises the steps that an optical frequency combsignal is divided into two paths, the baseband linear frequency modulation signal and the target echo signal respectively modulate one path of optical frequency comb signal to obtain an emission modulation optical signal and a reception modulation optical signal with orthogonal polarization states; the emission modulation optical signal and the reception modulation optical signal are combined into one path of polarization multiplexing optical signal and then are divided into two paths; two paths of signals are respectively analyzed to obtain an emission modulation optical signal and a composite optical signal containing the emission modulation optical signal and the reception modulation optical signal, the composite optical signal is subjected to photoelectric conversion and low-pass filtering to obtain an intermediate frequency signal, and the intermediate frequency signal is processed to obtain detection target information. Through a photon sampling technology and a photon polarization multiplexing technology, broadband and frequency band adjustable radar signals are generated and received, and a radar system is compact and simple and can be integrated.

The invention relates to the distributed optical fiber sensing technique, in particular to a distributed optical fiber multi-parameter sensing measurement system. The distributed optical fiber multi-parameter sensing measurement system solves the problem that according to an existing distributed optical fiber sensor, vibration information of sensing optical fibers can not be monitored. The distributed optical fiber multi-parameter sensing measurement system comprises a super-narrow-linewidth high-power optical fiber laser, a first 1*2 optical coupler, a single-side-band carrier suppression modulator, a second 1*2 optical coupler, a third 1*2 optical coupler, an electrooptical modulator, a first 2*1 optical coupler, a scrambler, an integrated wavelength division multiplexer, sensing optical fibers, a full-optical-fiber narrow-band low-noise Brillouin frequency shift, a narrow-band fiber bragg grating transmission filter, a second 2*1 optical coupler, a third 2*1 optical coupler, a first low-bandwidth high-gain photoelectric detector, a second low-bandwidth high-gain photoelectric detector and a data acquisition processing system. The distributed optical fiber multi-parameter sensing measurement system is suitable for various measurement fields.

The invention provides a vehicle laser radar distance and velocity measurement method, which is characterized by comprising a first step of driving, via a laser drive circuit, a laser to generate a narrow linewidth single frequency laser with continuous amplitude; a second step of, outputting, via an optical splitter, measurement light in the narrow linewidth single frequency laser outputted by the laser to an electrooptical modulator, and allowing the remaining reference light to pass through an acoustic optical modulator to generate a frequency offset for use locally as a reference signal; a third step of generating, by a local pulse generating circuit, a pseudo-random code, and obtaining a probe signal of a laser radar; a fourth step of enabling the probe signal to pass through an erbium-doped optical fiber amplifier so that the optical signal peak power can be amplified to 100W order or greater to form an amplified optical signal; a fifth step of mixing the amplified optical signal with the reference signal to output a heterodyne signal; a sixth step of calculating a correlation function of the heterodyne signal and a modulation code, so as to obtain the distance of a target; and a seventh step of analyzing unequal interval data acquired through heterodyne signal sampling, and thus obtaining the speed of the moving target.

The invention discloses a delay pulse Raman amplification based distributed sensing system. The delay pulse Raman amplification based distributed sensing system comprises a narrow line width light source, a Raman pump light source, a first modulation module and a second modulation module; the first modulation module is connected with the narrow line width light source; the second modulation module is connected with the Raman pump light source; the first modulation module passes through an erbium-doped fiber amplifier and a circulator in turn to be connected with a wavelength division multiplexer; the second modulation module is connected with the wavelength division multiplexer directly; the wavelength division multiplexer is connected with a sensing fiber; the first modulation module is connected with the second modulation module through a signal generator; the circulator is connected with a detector, a data acquisition module and a computer in turn through a filter. According to the delay pulse Raman amplification based distributed sensing system, the long effective sensing distance of the detection light can be achieved through the pulse modulation pumped Raman amplification with a certain amount of time delay.

The invention relates to a frequency agility synthesis method compatible with microwave large band width and mid-frequency small step and a device thereof. The invention is characterized in that direct simulation type frequency synthesis, direct digital frequency synthesis, and DSP(digital signal processor) technology are combined to perform frequency synthesis, so as to make the best of the advantages of the mentioned technologies, avoid technical defects, realize the optimization of all technical indexes of the frequency synthesizer, has a better expandability on the design of frequency band width and at the same time is compatible with large band width microwave frequency agility and mid-frequency small stepping frequency agility signal functions.

The invention provides an integrated luminous-region high-power vertical-cavity surface-emitting laser, comprising: an emitting hole, wherein isolating channels formed in the emitting hole divide theemitting hole into narrow emitting regions communicated with one another, and an insulating layer is arranged in each isolating channel; a conductive layer filling the isolating channels and extendedto two sides to gain ohmic contact with the narrow emitting regions. The emitting hole of the vertical-cavity surface-emitting laser with large oxidization pore size is divided into the narrow emitting regions; the narrow emitting regions gain contact with the conductive layer; on one hand, a current path in the emitting hole is extended, and the current density of the middle region of the vertical-cavity surface-emitting laser with large oxidization pore size can be effectively increased; on the other hand, current may propagate transversely from the conductive layer, distribution uniformityof current density in the mitting hole is greatly improved, and conversion efficiency is improved. In addition, coherence of outgoing light in large range is maintained. The integrated luminous-regionhigh-power vertical-cavity surface-emitting laser is applicable to laser radar, infrared cameras, depth recognition detectors and other fields.

The invention relates to a spectrum high-resolution coherent anti-Stokes Raman scattering light source implementation method. A pump source portion is divided into n+1 parts, wherein one part of pumplight can generate required signal lights through an optical parametric oscillator, and the other parts of pump light are sequentially combined with the transmitted signal light, and the combined signal light sequentially passes through n optical parametric amplifiers, so that the power of the signal light can be continuously amplified, and the spectral width of the signal light can be narrowed, and therefore, a spectrum high-resolution CARS (coherent anti-Stokes Raman scattering) light source can be realized; the four-wave mixing effect of photonic crystal optical fibers is utilized to realize optical frequency conversion; different photonic crystal optical fibers can be selected, so that CARS source output of different bands can be realized; the optical parametric amplifiers amplify signals of specific wavelength ranges, and thus, the selection of the photonic crystal optical fibers is equivalent to the addition of a spectral filtering effect, and narrow-spectral width laser can be realized, the frequency resolution of CARS spectral analysis can be improved; homologous parametric oscillators and cascade optical parametric amplifiers can be made of the same parametric medium, andtherefore, the coherence of the parametric signal light can be maintained, and the signal to noise ratio of the laser can be improved.

The invention provides a metal grid high-power vertical cavity surface emitting laser which comprises an emitting hole and a top electrode structure. The top electrode structure comprises a peripheralelectrode and a plurality of grid line electrodes, the peripheral electrode is arranged on the periphery of the emitting hole, and the grid line electrodes are connected with the peripheral electrodeand extend into the emitting hole. The vertical cavity surface emitting laser with large oxidation hole diameter is divided into a plurality of narrow-long block-shaped areas in a current path increasing manner through the grid line electrodes, on one hand, the current density of the middle area of the vertical cavity surface emitting laser with the large oxidation hole diameter can be effectively increased, on the other hand, current can be horizontally spread from the grid line electrodes, the distribution uniformity of the current density in the emitting hole is improved, conversion efficiency is improved, and the coherence of emergent light is kept in wide range. The laser can be applied to the fields of laser radars, infrared cameras, depth identification detectors and the like.

The invention provides a high-power navigation radar based on microwave coherent combination of magnetrons. A display terminal inputs a control signal, two modulator circuits are driven to be controlled by a control circuit, two same control signals are generated, and the magnetrons are controlled to generate two transmission signals with set frequency; the control signals driven by the control circuit control an externally-injected microwave source, two same microwave signals are generated, two composite signals are input into a directional coupler, final transmission signals are formed, coupling signals of the two directional couplers are fed back to the control circuit, and in this way, phase-shift values of externally-injected microwave source signals in the system are judged. According to the radar, the coherence of high-power signals synthesized by two circuits according to circulators is guaranteed, a waveguide power combiner is used for achieving coherent combination of the high-power transmission signals generated by the two magnetrons at last, the navigation radar is launched at high power, remote detection can be achieved, and safe navigation or smooth mooring of ships is guaranteed.

The embodiment of the invention provides a method for generating a reference frequency signal of a double-base satellite-borne SAR system. The method comprises the steps of receiving a control instruction, and determining a working mode based on the control instruction; when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source, wherein the frequency of the external taming crystal oscillator is synchronous with a preset vibration source; amplifying the crystal oscillator signal sent by the vibration source to obtain an amplified crystal oscillator signal; carrying out frequency multiplication on the amplified crystal oscillator signal to obtain a frequency-multiplied signal; performing power distribution on the frequency-doubled signal, and outputting the frequency-doubled signal conforming to preset power; and filtering and amplifying the frequency-doubled signal conforming to the preset power, and outputting the reference frequency signal. The embodiment of the invention also provides a device for generating the reference frequency signal of the double-base satellite-borne SAR system and a computer storagemedium.

The invention relates to the technical field of optical scanning imaging, and provides an OCT probe adjusting device which comprises an adjusting assembly, a mounting base and a probe assembly. The adjusting assembly comprises a fixed base, a movable base, a Z-axis adjusting piece used for adjusting the position of the movable base in the Z-axis direction of the fixed base, and a Y-axis adjustingpiece used for adjusting the position of the movable base in the Y-axis direction of the fixed base. The mounting base is mounted on the movable base, and the probe assembly is arranged on the mounting base. The position of the probe assembly in the Y-axis direction is adjusted through the adjusting assembly. The coherence of light is ensured to be in the middle position of a sample to be collected; the position of the probe assembly in the Z-axis direction is adjusted through the adjusting assembly. The light spots are ensured to be focused on the surface of a sample when the probe assembly collects sample data, so that the position of the probe assembly is convenient to adjust, high-resolution imaging is realized, and the scanning range is enlarged, and therefore, the device can adapt tomovable sample detection on an industrial production line, and batch detection of capsules is realized.

The invention discloses a rotary transport type weld leg cutter, which comprises a vertical rotary feeding tray and a double-cutter cutting piece, one end of the bottom plate is connected with a feeding trough through a first support column, and the center of the feeding trough is An orientation slot is provided, a deceleration block is provided at the lower end of the orientation slot, a vertical rotary feeding tray is provided below the outlet of the feeding slot, and the vertical rotary feeding tray passes through the bearing of the second rotating shaft and the supporting frame of the first rotating shaft The second rotating shaft is connected to the motor shaft of the motor through a coupling, and the side of the vertical rotary feeding tray is provided with a double-cutter head cutting piece, which is connected to the second rotating shaft on the upper part of the bottom plate through the first rotating shaft. on stage. In the present invention, the vertical rotary feeding tray is used for rotary transportation, which ensures the continuous type of transportation, and the structure is simpler, thus reducing the production cost of the product.

The invention discloses a remote radar detection system. The remote radar detection system comprises an antenna feeder assembly, a channel module, a signal processing module and a display and control module, the channel module is used for generating a first intermediate-frequency signal, up-converting the first intermediate-frequency signal into a radio-frequency signal, radiating the radio-frequency signal through the antenna feeder assembly, receiving an echo signal returned by the antenna feeder assembly, down-converting the echo signal to generate a second intermediate-frequency signal, and sending the second intermediate-frequency signal to the signal processing module; the signal processing module is used for carrying out pulse compression processing on the received second intermediate frequency signal and then detecting a target object according to a moving target detection algorithm; and the display and control module is used for displaying the related data sent by the signal processing module and sending an external control instruction to the signal processing module, so that the signal processing module controls the working states of the antenna feeder assembly and the channel module according to the external control instruction. The system can be used for detecting targets with low, slow and small characteristics, and the radar detection precision is greatly improved.