37 results about "Pulse front" patented technology

The application discloses an energy-saving control method of a CSR high-frequency PWM rectifier circuit. According to the value change of each line voltage of three-phase alternating current in a rectifier circuit and the characteristic that the rectifier circuit works at a high frequency, the two pulse wave edges of two phases of the three-phase alternating current are overlapped. The overlapping time of the overlapping of the two pulse wave edges is equal to the sum of the turn-on time and the turn-off time of a switching tube, so that the front edge or the rear edge of a pulse of a switching signal is in a soft switching state or in a cut-off low voltage state, thereby reducing the switching process loss of the switching tube. The application provides the energy-saving control method of the CSR high-frequency PWM rectifier circuit, which can reduce switching loss, reduce cost, save energy, prolong service life and is safe and reliable.

According to an embodiment of the present disclosure, a single-photon avalanche diode-based image sensor may comprise: a single-photon avalanche diode (SPAD) which generates a plurality of pulses corresponding to a plurality of photons, received during a predetermined exposure time, respectively; a front-end circuit which receives a set of pulses received during a partial time of the exposure time among the plurality of pulses; a counter which counts the number of pulses in the set of pulses; and a global clock which provides a plurality of clock pulses to the front-end circuit from after the partial time, wherein the quality of an image acquired using the SPAD is determined based on the timing of the global clock.

The present invention discloses a fast-front large-current pulse modulator and a control method. The large-current pulse modulator includes a DC voltage source unit, an inductor unit, a switch unit, an energy storage unit, and a load unit. The switch unit is composed of one or more groups of semiconductor switches to form a half-bridge structure. The inductor unit includes PCB trace inductance, device package inductance, and externally matched equivalent inductance, etc. The present invention proposes a control method for the fast-front large-current pulse modulator. The switches SW1 and SW2 do not conduct alternately. Instead, when the switch tube SW1 conducts, the switch SW2 still conducts for a period of time. At this time, the inductor current in the inductor unit gradually increases. When SW2 is turned off, the large pulse current generated by the inductor unit is used to charge the load, thereby obtaining a fast-front pulse. By using this method, by controlling the common conduction time of the switches, a pulse front far less than 30 ns can be obtained at both ends of the load, and arbitrary adjustment of the rising edge can be achieved simultaneously.

The invention relates to the technical field of pulse power, in particular to a time sequence synchronous trigger control method for a multi-path pulse switch of an LTD module, which comprises the following steps: S01, measuring the inherent delay time of each discharge branch in the LTD module from trigger signal input to gas switch conduction; and S02, inputting the measured inherent delay time value of each branch into a pulse time sequence controller as a compensation parameter, and setting the delay time of each output channel of the pulse time sequence controller. Through system calibration and programmable delay compensation of the pulse time sequence controller, in combination with high-precision time sequence control of the FPGA, the multi-way switch conduction time deviation can be controlled at the nanosecond level, the energy synthesis efficiency is greatly improved, inductance isolation transmission is achieved through magnetic ring coupling, traditional resistance isolation is replaced, pulse leading edge distortion is avoided, and the energy synthesis efficiency is improved. And meanwhile, high-voltage isolation safety is guaranteed, and trigger signal transmission quality is stable.

The present invention discloses a gate-controlled avalanche fast closure IGBT, which comprises, from bottom to top, a collector metal, a substrate, a first epitaxial layer, a second epitaxial layer, a third epitaxial layer, an emitter metal, and a gate metal. The third epitaxial layer comprises a first doped region, a second doped region, and a third doped region. The first doped region originates from the upper surface of the third epitaxial layer and extends downward to the lower surface of the third epitaxial layer. The second doped region originates from the upper left corner of the third epitaxial layer and extends downward to the lower right into the third epitaxial layer, with a certain distance from the first doped region. The third doped region is located within the second doped region and has a certain distance from the left and right sides of the second doped region. The emitter metal is located above a portion of the second doped region and a portion of the third doped region. The gate metal is located above the third epitaxial layer between the second doped region and the first doped region. In a pulsed power system, the avalanche closure IGBT provided by the present invention can significantly shorten the pulse front compared to traditional IGBTs, thereby improving pulse source performance.

The application discloses a partial discharge signal detection and segmentation method and system based on a wavelet Bayesian threshold, and the method comprises the following steps: through the combination of a shift-invariant wavelet transform and a Bayesian adaptive threshold, adaptive noise reduction is performed on a collected first partial discharge signal to suppress white noise and electromagnetic interference and avoid a pseudo Gibbs effect; then, a cascaded fourth-order zero-phase Butterworth high-pass filter is used to eliminate a direct current component and low-frequency clutter and completely retain pulse front characteristics; then, square amplitude enhancement and adaptive threshold screening are sequentially performed on the filtered signal to highlight effective pulses and eliminate slight interference; finally, through sliding window energy analysis, the starting position of a pulse wave front and the ending position of a pulse are accurately identified, and a reserved expansion sampling interval is combined to automatically intercept a complete partial discharge waveform, so that the automatic segmentation of a partial discharge event can be realized without relying on manual operation, and the recognition and positioning accuracy of the partial discharge signal is improved.

The invention relates to a SiC DSRD structure for optimizing pulse output characteristics and a preparation method, the structure comprises a cathode, an N + substrate, an N-base region, a P-base region, a P + region and an anode from bottom to top, and the main body structure material is a 4H-SiC material; one side, close to the N + substrate, in the N-base region is provided with at least one minority carrier lifetime attenuation suspension island layer, the top of the uppermost minority carrier lifetime attenuation suspension island layer does not exceed the transverse center line position of the N-base region, the minority carrier lifetime attenuation suspension island layers are arranged at intervals, one layer comprises at least one minority carrier lifetime attenuation suspension island, and the minority carrier lifetime attenuation suspension islands are distributed at equal thickness at intervals; the minority carrier lifetime attenuation suspension island is formed by injecting heavy metal ions into the N-base region; the problem of carrier distribution is solved from the source, the turn-off process of the SiC DSRD is quicker, the output voltage peak value is higher, the pulse leading edge is quicker, the carrier mobility is met, and meanwhile it is guaranteed that breakdown voltage is not degraded.

The invention relates to the technical field of nuclear radiation detection, in particular to a quasi-hemispherical CdZnTe detector reading circuit and a working method thereof. The reading circuit comprises a pre-amplification circuit, a clamping protection circuit, a pole-zero cancellation circuit, an operational amplification circuit, a differentiating circuit, an adjustable gain amplification circuit, a high-precision operational amplification circuit, a first-order S-K filter circuit and an impedance matching circuit which are connected in sequence. Wherein the pole zero cancellation circuit is used for offsetting an exponential decay pole introduced by the pre-amplification circuit; the differentiating circuit is used for compressing the signal pulse width; the adjustable gain amplification circuit is connected with the DAC voltage feedback circuit and is used for realizing gain adjustability; the reading circuit provided by the invention is connected with the CdZnTe detector, a charge signal output by the CdZnTe detector is processed by the reading circuit, and the energy resolution of the CdZnTe detector is improved to be less than 1% (at) 662 keV by extremely reducing noise, inhibiting accumulation, stabilizing a base line and keeping pulse front edge integrity.

The invention provides a double-grating monochromator, a double-grating monochromatization method, a double-grating monochromatization device, a medium and equipment, a first optical system comprises a first plane line-distance-variable grating and an incident plane mirror, a monochromatic light slit is arranged at the image plane position of the first optical system, a second optical system comprises an emergent plane mirror and a second plane line-distance-variable grating, and a monochromatic light slit is arranged at the image plane position of the second optical system. The second plane variable-line-distance grating and the first plane variable-line-distance grating are matched in parameter and are symmetrically arranged, so that the forward inclination of the pulse introduced by the first plane variable-line-distance grating is counteracted by the opposite dispersion effect generated by the second plane variable-line-distance grating; wherein the incident plane mirror and the emergent plane mirror respectively adjust the angle of an incident light beam at a fixed spatial distance in an off-axis rotation mode, and the angle adjustment and the scanning angle of the corresponding grating are cooperatively changed so as to maintain a constant grating equation relationship. And the output pulse width is remarkably compressed, and collaborative optimization of high energy resolution and optimal pulse output is realized.

The application relates to the technical field of lighting control, and discloses a night running sensing energy-saving lighting control system based on three-dimensional comprehensive positioning, which comprises a cloud server for establishing an association mapping table containing a preferred light color parameter, a main control computer for positioning a physical rod interval according to a face image, generating a first judgment instruction, and issuing a linkage preparation signal to complete electrical preheating, a millimeter wave radar for calculating a transient motion speed value and outputting an auxiliary judgment trigger pulse, a front-end single-chip microcomputer for responding to the auxiliary judgment trigger pulse to obtain actual space coordinates, combining the transient motion speed value to generate a theoretical motion track for space distance difference comparison, and confirming a linkage output instruction. A sub-controller receives the confirmed linkage output instruction, combines a background environment illuminance value and the preferred light color parameter, and outputs a digital dimming signal to an RGB+W lamp for light emission adjustment. The application combines macro interval positioning and micro track verification to realize precise follow-up lighting, and dynamically adjusts output according to ambient light to reduce system energy consumption.

The application discloses a method for generating an IRIG-B direct current code synchronous second pulse front edge based on a single-chip microcomputer. max The application can realize the same second pulse 1PPS precision by using a domestic single-chip microcomputer, does not need to use a separate FPGA, and greatly reduces the cost. When the first N max code symbols are received, a timer TIMER2 is enabled to start counting. When the counting value of the timer TIMER2 reaches a maximum value, an overflow interrupt is entered, and the timer TIMER3 is configured as a single pulse mode and enabled after the timer TIMER2 enters the overflow interrupt. After the timer TIMER3 is triggered, a signal second pulse 1PPS output by the timer TIMER3 is synchronized with the rising edge of the frame start code symbol of the next frame after a fixed delay Δ and a programmable delay Delay.

The present invention relates to a high-speed switch protection circuit for dynamic testing of power devices, which includes a first device under test Q1, a first diode under test D1, a load inductor L, a bus power supply Vbus, a test pulse generator P2, and a digital storage oscilloscope DSO; the bus power supply Vbus is grounded through a series connection of a high-speed switch module, the load inductor L, and the first device under test Q1, the load inductor L is connected in parallel with the first diode under test D1, the positive electrode of the first diode under test D1 is connected to the collector of the first device under test Q1, the gate and emitter of the first device under test Q1 are connected to the test pulse generator P2, and the digital storage oscilloscope DSO detects the voltage and current of the first device under test Q1; the high-speed switch module controls the connection or microsecond-level turn-off of the bus power supply Vbus before and after the test double pulses of the test pulse generator P2. The present invention removes the bus high-voltage power supply within microseconds after the test pulse ends, ensuring that the power module does not overheat and burn out.

The invention provides an optical fiber laser pulse string generation and amplification integrated module. The module sequentially comprises a pulse seed unit, a pulse frequency-selecting shaping unit and a pulse string amplification unit from an input end to an output end along a signal transmission light path, wherein the pulse seed unit is used for generating a MHz-magnitude high-repetition-frequency original pulse and pre-amplifying the MHz-magnitude high-repetition-frequency original pulse to obtain a first pulse string; the pulse frequency selection shaping unit is used for performing pulse frequency pickup and stepped intensity modulation processing on the first pulse string to obtain a second pulse string; the pulse string amplification unit is used for performing main amplification processing on the second pulse string so as to output a third pulse string with consistent sub-pulse intensity; the stable pulse source is provided through the pulse seed unit, meanwhile, by means of step-shaped modulation of the frequency selection shaping unit, reverse compensation of'front-strong and rear-weak 'of sub-pulses and flexible regulation and control of pulse parameters during main amplification are achieved at a stroke, then efficient power increasing of the pulse string amplification unit is guaranteed, and finally stable output of the uniform-strength high-repetition-frequency pulse string is achieved.

This invention discloses an extreme ultraviolet (EUV) time-delay compensated monochromator, processing method, and electronic device, relating to the field of EUV light processing technology. The monochromator includes: a first optical structure comprising a first planar blazed grating and a first ring mirror, wherein the first planar blazed grating is used to split and diffract the incident light, and the first ring mirror is used to focus and reflect the beam; a second optical structure comprising a second planar blazed grating and a second ring mirror, wherein the second planar blazed grating is used to compensate for the pulse forward tilt introduced by the first planar blazed grating, and the second ring mirror is used to focus and reflect the beam; and a slit plane, disposed between the first and second optical structures to ensure symmetry, for filtering the beam corresponding to the desired wavelength. This invention solves the technical problem in related technologies where monochromators cannot simultaneously achieve performance indicators such as energy transfer efficiency, spectral resolution, and pulse forward tilt compensation.

This invention discloses a detection system and method for cable fault location, relating to the field of cable fault location technology. It acquires nanosecond-level pulse propagation front-end change trajectory data and echo peak width change data to establish a high-frequency attenuation continuous-time distribution map; extracts pulse broadening growth segments and performs front-end compression control to form a compressed pulse front-end shape; rearranges the peak time position to separate low-amplitude reflection signals; tracks its amplitude trajectory and identifies local insulation anomaly segments by comparing with the peak width evolution trajectory; establishes a distance-back mapping and corrects the echo time coordinates to obtain the fault location interval. This invention improves the ability to identify early insulation defects by constructing a continuous-time distribution map and compressing pulse broadening segments, shortening the peak diffusion time, and separating low-amplitude reflection signals within the peak; simultaneously, it improves fault location accuracy and stability by establishing a distance-back mapping relationship and dynamically correcting the echo time coordinates.

The invention relates to a high-altitude electromagnetic pulse simulation device, in particular to an all-solid-state high-altitude electromagnetic pulse standard source based on a multi-tube series avalanche tube Marx circuit. The technical problem that due to inherent parasitic inductance existing in a discharge loop of an existing multi-tube series avalanche tube Marx circuit, output pulses cannot meet the requirements of high amplitude, fast leading edge and low jitter at the same time is solved. The standard source comprises a direct current charging power supply, a trigger unit, an avalanche transistor Marx circuit, a coaxial output cable, a radiating antenna and a waveform modulation structure. A multi-tube series avalanche tube Marx circuit topological structure is improved, an additional waveform modulation structure is introduced, the rising time of output pulses is effectively shortened, the technical problem that the pulse leading edge of a multi-tube series circuit is broadened due to parasitic inductance is solved, and the output pulse of the multi-tube series circuit is increased. And the high-altitude electromagnetic pulse waveform which is high in amplitude, fast in leading edge and low in jitter and meets the requirements of the international electrician committee standard can be generated.

A single-photon avalanche diode-based image sensor according to one embodiment of the present disclosure comprises: a single photon avalanche diode (SPAD) that generates a plurality of pulses corresponding to each of a plurality of photons received during a predetermined exposure time; a front-end circuit that receives a set of pulses, from among the plurality of pulses, received during a portion of the time of the exposure time; and a counter that counts the number of pulses in the set of pulses, wherein an end point of a portion of the time may be based on an overflow time point of the counter that counts the number of pulses in the set of pulses.

The application discloses a pulse electronic switch based on an enhanced driving and voltage equalization network, which comprises an H-bridge driving circuit, the H-bridge driving circuit is connected with primary windings of a plurality of magnetic isolation modules; the secondary windings of the magnetic isolation modules are respectively connected with corresponding driving waveform optimization circuits; the driving waveform optimization circuits are connected with gates of series power MOSFETs; a voltage equalization network is connected in parallel between the drains and the sources of the series power MOSFETs; the steps of the design method are as follows: step one, the control chip driving signal is amplified to 200V / 12A through the H-bridge power circuit; step two, the isolation driving is realized by using a through primary winding and a plurality of secondary windings; step three, the deviation of the pulse front edge and the pulse trailing edge of the gate driving signal is controlled to be within 10ns by using an analog compensation technology in the post-stage driving waveform optimization circuit; step four, the voltage equalization network composed of the voltage equalization resistors Rm, the RCD buffer circuit and the transient suppression diode is connected in parallel on the series switch link, the dynamic voltage peak of the switch is absorbed, the dynamic and static voltage equalization of the switch is realized, and the dynamic and static voltage unequalization problem can be effectively solved.

The invention discloses a nuclear signal-noise discrimination method based on pulse width, relates to the technical field of discrimination of flicker signals and photomultiplier dark noise, and can effectively distinguish photomultiplier dark noise signals and flicker signals and discriminate electronic noise at the same time. The method comprises the following steps: obtaining a plurality of pulse signals which are automatically triggered without a threshold value; carrying out peak searching on the signal, and judging the time t0 corresponding to a peak value; carrying out leading edge timing on the peak value t0 of the pulse signal to obtain the time t1 of the pulse leading edge; carrying out trailing edge timing on the peak value t0 of the pulse signal, and setting a time threshold value of the trailing edge timing; judging the data of the trailing edge timing, judging whether a plurality of peak superposition events exist in the trailing edge timing, and determining the time t2 of the pulse trailing edge; performing pulse width calculation according to the difference between the leading edge timing t1 and the trailing edge timing t2 judged from the peak time t0; and judging the types of PMT dark noise and nuclear signals according to the calculated pulse width.

The application provides a pressure-bearing equipment thermal insulation layer undismounting type pulse eddy current thickness measurement system and method, and relates to the technical field of nondestructive testing. The system comprises a probe module and a control analysis module. The probe module emits a detection pulse to the pressure-bearing equipment and receives a secondary magnetic field signal. The control analysis module extracts a quantitative space fluctuation parameter of the decay slope at the initial stage of the off period of the secondary magnetic field signal in the preceding detection period, feeds forward and scales the set pulse width of the current detection period according to the parameter; extracts the late residual amplitude at the tail end of the preceding detection period, maps the decay slope at the initial stage of the off period to a space penetration compensation coefficient, and dynamically sets the source end excitation peak value of the reverse demagnetization level by using the product of the two; and injects the reverse demagnetization level with the excitation peak value before applying the current detection pulse. The application can dynamically compensate the energy penetration dissipation caused by the space fluctuation and block the residual eddy current head-tail aliasing interference, and improve the accuracy of the equipment wall thickness inversion calculation.

The application relates to a single-pulse forward-looking scanning imaging focus compensation method, and aims to solve the problem of imaging defocus caused by the angle measurement deviation of a nonlinear angle discrimination curve in the single-pulse angle measurement process of an existing single-pulse forward-looking scanning imaging result. The process comprises the following steps: 1, obtaining the pulse compression echo results of sum and difference channels, namely one-dimensional range images; 2, taking N pulse compression echoes of the center scanning angle of the sum channel, calculating the normalized amplitude variance, selecting a distance unit with the maximum amplitude of the one-dimensional range image and a normalized amplitude variance less than 0.12; 3, obtaining a time-frequency diagram, calculating an azimuth angle and recording the corresponding scanning angle; 4, in the distance unit, selecting each scanning angle respectively, repeating step 3 to obtain a curve, and fitting the curve with a polynomial; 5, obtaining a focused compensated image by using the corrected angle single-pulse projection. The application is used in the field of radar imaging.

The invention provides an optical fiber laser pulse height compensation method and system, and the method comprises the steps: enabling pump light of a pump source to be coupled with seed light outputted by a seed source module in an amplification module, and achieving the amplification through a gain optical fiber, and obtaining a laser pulse outputted by an optical fiber laser; the pumping source is started, a pre-current is injected into the gain fiber in advance, and the time is maintained for t1; the pumping source is controlled, overshoot current is injected into the gain optical fiber for a certain time, and then main current is continuously output; the duration and the magnitude change of the overshoot current enable the pulse generated after the pre-current is applied to be sunken; and starting the seed source module, wherein the time for starting the seed source module is equal to or later than the time for just injecting the overshoot current. Under the condition that output parameters of a seed source are not changed and low-absorption-coefficient optical fibers are not limited, the problem of pulse front-section sequence sag is compensated only according to a pumping driving mode from gain optical fiber amplification and loss mutual curves.

The full solid-state parameter adjustable energy recovery excitation source comprises a charging circuit, a main power circuit and a load circuit. The coil current parameters can be flexibly regulated by the working time sequence of each stage switch. The number of discharge modules contained in the full solid-state parameter adjustable energy recovery excitation source is flexibly adjustable, the structure is simple and reliable, the corresponding module number can be matched according to the application requirement, and the cost is reduced. The full solid-state parameter adjustable energy recovery excitation source can feed back the load energy to each stage capacitor through the front-end commutation switch and the energy feedback diode, so that the system energy utilization efficiency is improved. The full solid-state parameter adjustable energy recovery excitation source can break through the limitation that the traditional topology can only adjust the pulse front edge or a single parameter by controlling the input time sequence of each module, and fine and multi-dimensional control of the whole pulse waveform is realized.

The invention relates to the technical field of electromagnetic environment signal monitoring, in particular to a novel suppressing interference mode analysis and identification method, which comprises the following steps of: sending a leading signal before each pulse during radar scanning, and acquiring frequency spectrum and envelope data from the current leading signal time period to the next leading signal time period in real time by an interception device; the processing front end carries out digital channelization processing and accumulation on the spectrum data, carries out sliding window recording on envelope data, and carries out timed framing transmission to the processing rear end; the processing rear end carries out conjoint analysis on the collected frequency spectrum and envelope information, and if interference exists, the interference is recorded in a temporary interference result table; when the radar continuously rotates for 5 degrees and no interference is detected, extracting all data between the starting index and the cut-off index, determining the real orientation of an interference source through the maximum amplitude point of an interference signal, and analyzing the broadband or narrowband, sweep frequency or non-sweep frequency and continuous or discontinuous characteristics of the interference source; and finally, outputting a result according to a characteristic judgment criterion and emptying the temporary table for circular detection.

The application provides a nanosecond front edge high-voltage pulse trigger power supply, which comprises a power frequency voltage-boosting rectification unit, a primary discharge unit, a pulse transformer and a secondary high-voltage unit connected in sequence; the input end of the power frequency voltage-boosting rectification unit is connected with an external power supply, the output end of the power frequency voltage-boosting rectification unit is connected with the input end of the primary discharge unit, and the primary discharge unit is used for receiving direct-current high voltage output by the power frequency voltage-boosting rectification unit and storing energy; the output end of the primary discharge unit is connected with the input end of the pulse transformer, the output end of the pulse transformer is connected with the input end of the secondary high-voltage unit, the pulse transformer is used for generating a microsecond high-voltage pulse when the primary discharge unit discharges, and the secondary high-voltage unit receives and utilizes the microsecond high-voltage pulse to further generate a nanosecond high-voltage pulse, so that the nanosecond front edge high-voltage trigger power supply with the advantages of high output voltage, fast pulse front edge, repeatable frequency operation and convenient output polarity adjustment is realized.

The invention provides an n / gamma discrimination method based on a pulse front and back edge combined gradient. The n / gamma discrimination method comprises the following steps: carrying out preprocessing including smooth filtering, baseline deduction, accumulation discarding and maximum value amplitude normalization on a mixed radiation field pulse signal; searching a peak point of the preprocessed n / gamma pulse signal, respectively selecting sample points at a time interval before and after the peak point, and respectively making gradients between the two sample points and the peak point; multiplying the obtained front and back edge gradients of the pulse to obtain a combined gradient value; and discriminating the n / gamma pulse signal by taking the combined gradient value as a pulse waveform discriminating parameter. Compared with the existing pulse gradient method, the method has the advantage that the screening effect is obviously improved on the premise of not increasing excessive calculation amount.

A method for processing an analog signal comprising: - Detection of the analog signal, this detection including the generation of a first time reference signal, in particular a reference pulse, provided that an amplitude of the analog signal exceeds a predefined threshold; - Generation of a series of time windows, on several channels (V1, V2, V3, V4), from the first time reference signal, the time windows of the series being successive and / or of different durations; - Generation of signal shapes, on each of the channels (V1, V2, V3, V4), by multiplying each of these time windows by the analog signal as is or converted into a baseband signal; and, - A step of generating the parallel output signals. Figure for the abstract: Fig. 1

The application belongs to the technical field of radio frequency power amplifier overheat protection, in particular to a self-adaptive temperature sensing power amplifier tube protection method and system, wherein the method comprises: establishing a nonlinear time-varying thermal model of the power amplifier tube; before transmitting a pulse, calculating a heat consumption function of heat consumption changing with time according to the pulse input power and the pre-labeled power-heat consumption relationship; collecting the working temperature of the power amplifier tube in real time, and comparing it with the model predicted temperature to obtain a temperature error; correcting the thermal model parameters and the temperature rise function in real time according to the error through an adaptive filter; generating static bias compensation and dynamic baseband pre-distortion signals based on the corrected temperature rise function, and pre-distorting and compensating the input signal. The application overcomes the defects of large error of traditional linear thermal model and open-loop compensation without feedback, realizes high-precision and self-adaptive temperature protection and linearization, and is particularly suitable for magnetic resonance imaging and communication systems.

This invention relates to the field of laser communication technology and discloses a high-precision ranging method and system based on spaceborne laser communication. The method includes: when two terminals send communication signals, aligning the falling edge of the last bit of the frame synchronization header of the data frame with the leading edge of the local satellite clock's integer second pulse as a ranging identifier; modulating the baseband signal containing the ranging identifier into an optical signal and transmitting it into free space; receiving the downlink optical signal from the cooperating terminal and demodulating it into a baseband signal; performing multi-level time delay calibration to obtain the time delay parameters of the system's transceiver channel, and using a code synchronization loop in the communication link to recover the symbol clock phase; and calculating the distance and clock difference between the two terminals based on the arrival time of the ranging identifier and the time delay parameters using a bidirectional one-way ranging model. The above method integrates laser communication and ranging, ensuring high ranging accuracy while saving hardware resources, and is suitable for inter-satellite and satellite-to-ground high-precision laser ranging and high-speed data transmission integration scenarios.

The invention discloses a method for adjusting the output front edge of a multi-primary pulse modulator, and the method comprises the steps: controlling the conduction time sequence of each primary winding of the multi-primary pulse modulator, and adjusting the conduction time of each primary winding in real time, thereby adjusting the output pulse front edge through the influence of the conduction of the primary windings on the loop impedance. According to the scheme, software is adopted to control the conduction time sequence of the primary windings, that is, the conduction time of each group of primary windings can be adjusted through the software, the opening time of each path is adjusted in real time, loop impedance is affected through the method, and then the leading edge is affected to achieve the adjustment purpose.