492 results about "Narrowband" patented technology

The invention belongs to the technical field of intelligent engineering management, and discloses an automatic monitoring and control method of an engineering management system based on the Internet of Things. According to the method, a four-layer Internet of Things architecture comprising a sensing layer, a network layer, a platform layer and an application layer is constructed, and the four-layer Internet of Things architecture is uploaded to a cloud platform through a 5G / narrowband Internet of Things dual-mode transmission channel. A digital twinborn technology is innovatively adopted to construct a three-dimensional visual engineering model, intelligent identification and prediction of abnormal working conditions are realized through a machine learning algorithm, and a multi-stage linkage control mechanism is established. And when construction deviation or equipment failure is detected, the system automatically generates an optimization control strategy and issues the optimization control strategy to the execution terminal, so that accurate regulation and control of the construction machinery and intelligent pushing of early warning information are realized. According to the method, a manual inspection mode of traditional engineering management is broken through, full-process automatic supervision is realized through data fusion analysis and closed-loop control, the construction quality supervision precision is effectively improved by more than 30%, the safety accident rate is reduced by 50%, and the engineering management efficiency is remarkably improved.

A communication method includes: sending a first poll frame, where the first poll frame is for triggering ranging measurement in a first range-measurement cycle, the first poll frame further indicates a first parameter set that takes effect in the first range-measurement cycle, and the first parameter set includes one or more of the following parameters: a first narrowband physical layer (PHY) parameter, a first narrowband channel allow list, a first ranging block structure parameter, or a first ultra-wideband (UWB) multi-millisecond (MMS) ranging configuration parameter; and receiving a response frame of the first poll frame. According to the present disclosure, an initiator uses a poll frame to indicate a parameter set that takes effect in a current range-measurement cycle.

The invention relates to the technical field of semiconductor radio frequency signal processing, and discloses a narrowband signal receiving system and method, and the system comprises a coarse frequency offset value capturing module, a carrier phase locking module, a digital domain carrier tracking module, a timing synchronization and multipath correction module, and a vector amplitude phase correction and equalization module. In the prior art, the technical problems of lock losing, judgment errors and high bit error rate caused by serious multipath interference and frequency offset drifting of narrow-band signals are difficult to solve in complex environments with multipath effect and high frequency offset, such as urban canyons, basements and warehouses. According to the invention, by introducing analog phase locking, digital fine tuning, dual-correlation symbol synchronization based on multi-path sensing and vector amplitude-phase combined compensation overall architecture with cooperation of analog and digital, the problems of synchronization failure and demodulation performance reduction caused by multi-path distortion in the prior art are avoided; and the sensitivity and the overall reliability of radio frequency signal receiving are remarkably improved.

A multimode cabinet intelligent management terminal for narrowband Internet of Things communication comprises an environment monitoring module, a load sensing module, a protocol switching module and a bandwidth scheduling module. The environment monitoring module obtains key indexes of network signal strength, delay and packet loss rate and calculates environment data; the load sensing module collects CPU usage rate and memory usage condition load data, evaluates the load state of an Internet of Things sensor node, and generates load data and environment data. The protocol switching module dynamically evaluates network environment and equipment load changes, predicts a network environment change trend by adopting a weighted decision method, and screens an optimal protocol based on a protocol switching strategy; and the bandwidth scheduling module performs optimal allocation on the bandwidth, automatically adjusts bandwidth resources, and performs release and reallocation by monitoring the network condition in real time to obtain bandwidth resource information. The invention provides a multimode cabinet intelligent management terminal for narrowband Internet of Things communication. Accurate point prediction and reliable interval prediction and probability prediction of wind power are realized.

The invention relates to the technical field of agricultural environment information, and discloses a rice field nitrogen and phosphorus loss amount remote regulation and control method oriented to environment data. The method comprises the following steps: acquiring historical nitrogen and phosphorus loss data, real-time meteorological data and water and fertilizer operation information of the rice field; constructing a mechanism constraint sub-model fusing nitrogen migration and transformation kinetics and phosphorus adsorption and desorption balance; performing multi-source feature extraction on the meteorological data to generate a standardized environment vector; inputting the lightweight residual convolutional neural network to output an initial prediction value; on-line fine adjustment is carried out through a Lagrangian multiplier method in combination with the mechanism model, and a corrected predicted value conforming to substance conservation is generated; and when the predicted value exceeds a threshold value, generating a drainage gate opening degree and fertilization plan adjustment instruction, and issuing the instruction to an edge terminal for execution through the narrowband Internet of Things.

The invention discloses a repetitive control-based circulating current suppression method between grid-forming type energy storage units, and relates to the technical field of power electronics and control, the method adopts three rings of power, voltage and current to regulate and control a grid-forming type multi-machine parallel inverter, a repetitive controller is introduced into a current inner ring, and the repetitive controller is introduced into a current outer ring to control the circulating current between the grid-forming type energy storage units. The method has the advantages that periodic harmonic current is accurately tracked and suppressed, meanwhile, a narrow-band resonance circuit and LC filter state feedback and pole assignment design are introduced into a current loop, LC filter resonance peaks are effectively eliminated through LC filter state feedback and pole assignment, typical harmonic circulation in a parallel system is further suppressed through the narrow-band resonance circuit, and the harmonic current suppression efficiency is improved. Efficient suppression of circulation among the units and uniform distribution of power are further realized; according to the technical scheme, the stable operation of the system can be guaranteed, the power sharing capability and the grid-connected adaptability of the energy storage unit are improved, a complex distributed communication structure is avoided, and the operation reliability of the network construction type energy storage system in a complex power grid environment is improved.

The invention relates to the technical field of remote sensing image processing, in particular to a geographic information acquisition method and system based on remote sensing image.The method comprises the following steps that a narrow-band spectrum sensor obtains multiband image data, reflectivity peak value coordinates are extracted through peak value detection, and band peak value displacement data are calculated; the method comprises the steps of extracting peak displacement of wave bands, analyzing stability through Kalman filtering, screening a stable wave band set, constructing a standard spectrum feature library based on the set, calculating spectrum similarity values through difference values, outputting land utilization types through Bayesian classification, and generating a geographic information distribution diagram. The spectral expression is constructed based on stable reflection characteristics, the influence of imaging condition fluctuation on samples is reduced, the type distinction degree is enhanced through stable wave band difference value symbol matching, the category judgment accuracy based on likelihood inference is improved, classification keeps coherence in an illumination change scene, and the reliability and consistency of spatial distribution results are improved.

The present application belongs to the technical field of aircraft structure fatigue strength, and particularly relates to a method for converting a buffeting frequency spectrum of an aircraft structure into a fatigue load spectrum, comprising the following steps: Step 1: processing buffeting response load data of the aircraft structure to obtain a first-order bending modal characteristic frequency f1; Step 2: performing narrowband filtering on the buffeting response load data, and calculating a root mean square value σ of the filtered narrowband buffeting response load data; Step 3: performing rainflow counting on the filtered narrowband buffeting response load data to count the amplitude distribution of the narrowband buffeting response load data; fitting the amplitude distribution of the narrowband buffeting response load data with a Rayleigh distribution; and equivalently distributing the amplitude distribution fitted with the Rayleigh distribution to three typical load amplitudes; and Step 4: establishing a periodic step load spectrum according to the frequency of the three equivalent typical load amplitudes.

Methods, systems, and devices for wireless communications are described. A user equipment (UE), such as a narrowband internet of things (NB-IoT) UE, may determine whether a cell supports PWS notification and may respond accordingly. The UE may establish a wireless connection with a network entity associated with a cell. Then, the UE may receive, from the network entity via the wireless connection, a first message that indicates whether PWS notification is supported by the cell. The first message may be a master information block (MIB). The MIB may indicate that one or more PWS messages are scheduled. Additionally, or alternatively, the first message may be a first system information block (SIB). The UE may perform one or more operations to establish a connection with a cell that supports PWS notification.

The application relates to the technical field of data processing, and discloses a radar real-time data transmission processing classification identification method and system.The method comprises the following steps: performing track mode identification on narrowband data of a target radar to obtain a real-time motion mode category of the narrowband data; performing directional region selection on synchronous wideband echo data of the target radar based on the real-time motion mode category to obtain a signal segment of the synchronous wideband echo data; performing sparse decomposition on the signal segment to obtain compact features of the signal segment; performing motion mode compatibility quantification on the compact features based on the real-time motion mode category to obtain category scores of the compact features; performing feedback adjustment on the real-time motion mode category based on the category scores and the compact features to obtain an optimized motion mode of the real-time motion mode category; and performing confidence fusion judgment on the optimized motion mode to obtain a classification identification of the real-time motion mode category; and the application can improve the efficiency of radar real-time data transmission processing classification identification.

This invention provides an adaptive method and system for fast spatial spectrum estimation of multipath channels. The method includes: S1, using a linear uniform array as the receiving array, with the first element in the array as the reference element, deriving the broadband signal model and steering vector matrix received by the array; S2, constructing a fitness function, and using the dung beetle algorithm to search for the optimal fractional Fourier transform order of the received signal from the reference element; S3, performing the optimal fractional Fourier transform on the received signal of the array; S4, finding the coordinates (u) corresponding to the maximum value. p ,v p S5. Energy detection: Set a threshold for comparison. If the threshold is met, it indicates that the location of this point is a component of the multipath; otherwise, the algorithm ends. S6. Use the CLEAN algorithm to separate the multipath components. The center frequency of its narrowband filter is u. p S7. Use the MUSIC algorithm to estimate the incident angle of the multipath components; S8. Mask the strongest component among the current multipath components and return to repeat steps S4 to S7 until all components are estimated.

This utility model discloses a broadband high-speed photodetector module, including: a housing and a driving circuit. The housing has an internal mounting cavity, a high-speed broadband response photodetector, and is fixed inside the housing via an SMA interface. An OLED display screen is embedded on the front of the housing and connected to the driving circuit via a flexible circuit board. The high-speed broadband response photodetector has a spectral response range of 800nm ​​to 1650nm, fully covering the wavelength requirements of multimode and single-mode optical fibers. It solves the limitations of traditional modules with single wavelength or narrow spectrum, significantly improves compatibility with different optical fiber systems, and is suitable for complex hybrid optical fiber network scenarios. Through the coordinated design of the cylindrical body on the side wall of the housing, the air outlet, and the heat dissipation components, the heat generated by the photodetector during operation can be quickly dissipated, avoiding performance degradation or device damage due to temperature rise, and ensuring long-term stable operation of the module under high-speed and high-load conditions.

The invention discloses an integrated communication service platform and an application method, the integrated communication service platform comprises a case and a backboard used for electrical signal interconnection between board cards, the backboard comprises a power supply back box slot, two power supply slots, an auxiliary control slot, a main control slot, two exchange slots and 11 expansion slots, and all slots are in signal connection through various buses; a power supply back box; a power board; an auxiliary control board; the main control board is used for the case control management center; the two exchange boards are used for data exchange and forwarding processing; and a plurality of expansion boards for assisting according to requirements. The system is deployed in a communication system, is a basic platform for realizing voice and data transmission communication in the communication system, realizes centralized and intelligent management of a network, realizes broadband / narrowband link fusion networking communication, solves the problems of low integration level, poor expansibility, low communication efficiency and inconvenience in maintenance of a traditional communication system, and meets the requirement of miniaturized installation.

The invention discloses an infrared bipolar linearly-polarized photoelectric detector and a preparation method thereof, and the infrared bipolar linearly-polarized photoelectric detector is characterized in that a bipolar material graphene is used as a channel material, a two-dimensional N-type semiconductor material molybdenum disulfide MoS2 and an anisotropic narrow-band-gap two-dimensional material black phosphorus BP are stacked on the bipolar material graphene in sequence, and the two-dimensional N-type semiconductor material molybdenum disulfide MoS2 and the anisotropic narrow-band-gap two-dimensional material black phosphorus BP are stacked on the channel material; the polarity of the graphene is regulated and controlled by the bottom gate, the infrared bipolar linearly polarized photoelectric detector with the bipolar linear polarization detection effect that the light current symbol reversibly turns over along with the polarization direction in the infrared band is achieved, and the infrared bipolar linearly polarized photoelectric detector has the advantages of being simple in structure, easy to regulate and control, capable of remarkably improving polarization recognition precision and the signal-to-noise ratio and the like. The programmable and multifunctional integration potential is also realized.

The invention provides a light generating system (1000) comprising a first light generating device (110), a second light generating device (120), a third light generating device (130), and a control system (3000); wherein: (A) the first light generating device (110) comprises a first solid state light source (10) configured to generate first light source light (11) and a first luminescent converter (2100); (B) the second light generating device (120) comprises a second solid state light source (20) configured to generate second light source light (21) and a second luminescent converter (2200); (C) the third light generating device (130) comprises a third solid state light source (30) configured to generate third light source light (31) and a third luminescent converter (2300); (D) the first, second, and third luminescent converter (2100, 2200, 2300) comprise a narrowband luminescent material (400); wherein the first and second luminescent converter (2100, 2200) further comprise a green-yellow luminescent material (200) and a broadband luminescent material (300); (E) the green-yellow luminescent material (200) is configured to convert the first and second light source light (11, 21) into green-yellow luminescent material light (201); (F) the broadband luminescent material (300) is configured to convert (a) the first and second light source light (11, 21) and / or (b) the green-yellow luminescent material light (201) into broadband luminescent material light (301) having a broadband centroid wavelength (λcb) of 600-670 nm; (G) the narrowband luminescent material (400) is configured to convert the first, second, and third light source light (11,21,31) into narrowband luminescent material light (401) having a narrowband centroid wavelength (λcn) of 610-650 nm; (H) the first light generating device (110) is configured to generate white first device light (111); (I) the second light generating device (120) is configured to generate white second device light (121); wherein: (i) a relative spectral power of the broadband luminescent material light (301) and / or the narrowband luminescent material light (401) in the second device light (121) differs from that in the first device light (111); (J) the third light generating device (130) is configured to generate third device light (131) having a third device centroid wavelength (λcd3) of 610-650 nm; (K) the light generating system (1000) is configured to generate system light (1001) comprising the first, second, and / or third device light (111,121,131); and (L) the control system (3000) is configured to control a spectral power distribution of the system light (1001) by individually controlling the first, second, and third light generating device (110, 120, 130).

Methods, systems, and devices for wireless communications are described. Generally, the described techniques may enable a user equipment (UE) to receive warning notifications while connected to a narrowband internet-of-things (NB-IoT) network. In some examples, the UE may periodically tune a radio frequency chain of the UE to another network that supports a public warning system to monitor for one or more paging messages, the one or more warning notifications, or both. In some cases, the UE may periodically tune to the other network entity in accordance with a sleep mode of the UE. Additionally, or alternatively, the NB-IoT network may transmit the one or more paging messages to the UE, and the UE may tune to the other network entity to receive the one or more warning notifications based on receiving the one or more paging messages.

This invention relates to the field of electronic measurement technology and discloses an online measurement method and system for the quality factor of resonant circuits. The method involves injecting a small-amplitude sinusoidal disturbance signal into the excitation end of the resonant circuit under test using weak electromagnetic coupling, extracting the amplitude and phase of the disturbance response using lock-in amplification technology, performing Lorentz fitting on the frequency response curve to calculate the negative 3 dB bandwidth, outputting the quality factor in real time from the ratio of the resonant frequency to the bandwidth, introducing cross-correlation narrowband filtering to compress the equivalent noise bandwidth to below 1 Hz, and having an automatic resonant frequency tracking function.

The invention discloses a reflection type polarization conversion antenna with an adjustable stop band, which works in an X wave band and is composed of a dielectric substrate, a metal resonance structure layer arranged on one side of the dielectric substrate and a metal reflection layer arranged on the other side of the dielectric substrate, and the metal resonance structure layer comprises two groups of mutually nested symmetrical split circular ring resonance units. Through the technical means of translation, parameter adjustment and the like, the two groups of resonance units generate symmetry difference, so that different resonance units generate mutually counteracted surface current responses at a specific frequency, and a stop band for polarization conversion suppression is formed in a continuous working frequency band; the position and suppression intensity of the stop band can be controlled by adjusting the structural parameters of each resonance unit. While broadband high-efficiency polarization conversion is realized, a tunable narrowband polarization conversion zero point is introduced, and the tunable narrowband polarization conversion zero point has the advantages of simple structure, high regulation degree of freedom and good incident angle stability, and is suitable for communication, radar and signal monitoring systems of millimeter wave and microwave frequency bands.

The invention relates to the technical field of rotating machinery fault monitoring, and discloses a method and system for monitoring a torsional vibration fault of a shaft system of a steam turbine generator unit, and the method comprises the steps: obtaining a single-point torsional vibration signal, and converting the single-point torsional vibration signal into an angular domain sequence; extracting a narrow-band modulation component of a specific order band and calculating a torsional vibration logarithmic response spectrum; performing inverse transformation on the logarithmic spectrum to obtain cepstrum data reflecting the periodicity of the shafting structure; delimiting a structure reflection propagation time delay interval according to the geometric distance from the sealing end to the rigid coupling and the material wave velocity; identifying a sealing-coupling boundary reflection peak value and a series structure in the interval, and constructing a series enhancement index; reversely deducing an equivalent reflection intensity and an equivalent structure distance, and generating a health index; and finally, mapping the health index into a binarization result through a step function, and outputting normal or abnormal judgment for the sealed end. According to the invention, the high-sensitivity and deterministic monitoring of the local abnormity of the sealing end is realized by using the echo structure information.

An imaging device according to one embodiment of the present disclosure includes a multispectral sensor section, a narrowband signal generator, and a controller. The multispectral sensor section outputs a plurality of (N) wavelength signals as pixel signals. The narrowband signal generator uses a coefficient matrix to generate, from the plurality of wavelength signals output from the multispectral sensor, a plurality of M (M>N) narrowband signals that is narrower in bandwidth than the wavelength signa. The controller calculates an evaluation value by performing weighted average processing on the plurality of wavelength signals or a plurality detection values generated using the plurality of wavelength signals, and performs exposure control of the multispectral sensor section on the basis of the calculated evaluation value.

The invention relates to the technical field of agricultural information and intelligent sensors, and discloses a farmland soil moisture content real-time monitoring method based on multi-sensor fusion. The method comprises the steps that passive sensing nodes integrating water content, temperature, conductivity and water potential sensors are arranged, soil micro-vibration is converted into electric energy through a piezoelectric energy collection module and stored in a super capacitor, and low-power-consumption wide-area synchronous communication is achieved through the narrowband Internet of Things; and the cloud carries out time alignment, abnormity elimination and fusion processing on the multi-source data to generate a soil moisture status field, and outputs an irrigation decision in combination with a crop growth model. According to the invention, high-precision, self-powered and maintenance-free soil moisture content in-situ monitoring and intelligent irrigation closed-loop control are realized.

The utility model discloses equipment for testing the tensile stress-strain performance of a rubber combined narrow V-shaped belt, and relates to the technical field of rubber testing, the equipment comprises a bottom plate, and the top end of the bottom plate is respectively provided with a testing assembly and a protection assembly; the protection assembly comprises a protection shell, and a transparent observation plate is slidably arranged on one side of the outer wall of the protection shell. The testing assembly comprises an electric sliding rail and two movable sliding blocks, a C-shaped plate and a machine shell are fixedly installed at the top ends of the movable sliding blocks respectively, a first screw rod is rotatably installed on the inner wall of the machine shell, the top end of the first screw rod penetrates through the top end of the machine shell, and a first bevel gear is fixedly installed at the top end of the first screw rod. According to the V-belt stretching test device, the V-belt fixing and clamping efficiency is improved, the stretching test speed of the V-belt is effectively improved, the automatic opening and closing design of the transparent observation plate facilitates preparation work before the test, the protection effect is ensured in the test process, and the safety of the test process is improved.

The utility model relates to the technical field of power equipment monitoring and early warning, and provides intelligent equipment for intelligent water immersion and external damage monitoring and early warning based on wireless narrowband communication, and the equipment is mainly composed of a cabinet body, a water level sensing device and an external detection part. The water level sensing device is installed on the side, close to the potential water immersion area, of the cabinet body, and the external detection component is used for monitoring the cabinet deformation condition caused by external force impact in real time. The water level sensing device and the external detection part are both connected with the signal acquisition unit, and the signal acquisition unit is electrically connected with the memory and realizes data transmission with the remote controller through the wireless communication assembly. According to the equipment, the water level sensing device and the external damage detection part are utilized, the wireless communication technology is combined, the remote intelligent monitoring and early warning functions of the switch cabinet are achieved, the manpower inspection cost is effectively reduced, the monitoring efficiency is improved, and the defect that potential problems are difficult to find in time in a traditional inspection mode is overcome.

The invention provides a cable joint partial discharge fiber bragg grating sound wave intelligent sensing and detection method, and relates to the technical field of cable partial discharge detection, and the method comprises the steps: obtaining multi-channel time-domain spectral response data of a detected cable joint through a fiber bragg grating sensing array, and demodulating the data to obtain a multi-dimensional feature vector group; decomposing the waveform signal into narrowband intrinsic mode components, extracting energy density through Hilbert transform and executing singular value decomposition, and screening dominant mode components to reconstruct the waveform signal to obtain stress wave time sequence characteristics; calculating a waveform high-order cross-correlation tensor as a hyperedge weight, extracting a time-frequency amplitude feature vector as an initial node feature, constructing a space-time hypergraph, and generating a node embedding vector through graph convolution; and initializing a Gaussian noise field based on a node embedding vector and setting condition information, executing reverse sampling denoising to generate a three-dimensional space probability density field to identify an initial positioning coordinate, and iteratively correcting the positioning coordinate and a wave velocity value until a residual error converges.

The application discloses a kind of narrowband internet of things wireless communication optimization digital twin method and system, it is related to wireless communication optimization technical field, method includes the digital twin environment corresponding to target industrial scene is constructed, for simulating wireless signal propagation characteristic;NB-IoT network is deployed in digital twin environment, and channel data is obtained by running wireless communication simulation;According to channel data, the communication performance index of terminal is calculated, and the terminal to be optimized is identified;For the terminal to be optimized, select relay terminal in digital twin environment and determine the gain of amplify and forward, simulate the process of cooperative communication;Re-run simulation to verify optimization effect, if it does not meet the requirement, then adjust parameter and repeat optimization, until the communication performance of all terminals meets the standard.The application migrates the optimization process of traditional dependence on site traversal test to virtual space, without large-scale artificial road test in live area such as transformer substation, shorten optimization period, reduce cost.

This invention discloses an infrared positioning system, including an electronic tag, a camera base station, and a processor. The camera base station includes a first camera, a second camera, and a filtering device. The filtering device includes a switching component and a narrowband filter. The narrowband filter and the switching component are connected and can move under the action of the switching component. The electronic tag is used to periodically radiate infrared encoded information. The first camera is used to capture a first visible light image. The second camera is used to capture a second visible light image when the narrowband filter is located to one side of the second camera, and to capture an infrared image when the narrowband filter is in front of it, so as to capture a target carrying an electronic tag. The processor is used to obtain the mapping relationship between the pixel position coordinates of the infrared image and the first visible light image, and to process the infrared image to obtain the center pixel coordinates of the target and the number of the carried electronic tag, thereby obtaining the position of the target according to the mapping relationship and the center pixel coordinates of the target.

The present disclosure relates to a device and a communication method for appropriately determining: the timing and the frequency of an R2D signal used for CFO calibration; and the detection of the R2D signal used for the CFO calibration. The device, which has lower complexity than a Narrow Band Internet of Things (NB-IoT) device, comprises: a reception unit that receives a reception signal including control information from a wireless communication device; and a control unit that determines which sequence / pattern / length is to be detected from a signal of a clock acquisition part of the reception signal on the basis of the control information in the reception signal. The control unit determines to use a signal of the sequence / pattern / length detected from the clock acquisition part for timing calibration and calibration of a carrier frequency offset.

A narrow-bandwidth terminal device performs radio communication at a bandwidth narrower than a system bandwidth. The narrow-bandwidth terminal device in an idle state camps on a cell, and performs discontinuous reception of a signal transmitted from the cell. The terminal device also determines a reception condition of the signal, for example, whether the signal can be received. When it is determined that the signal cannot be received, the narrow-bandwidth terminal device moves out of a coverage area of the cell while continuing to perform the discontinuous reception. When it is determined that a discontinuous reception timer has been completed, the narrow-bandwidth terminal device continues to perform the discontinuous reception.

A wireless communication method and related apparatuses are provided. The method by a user equipment includes receiving at least one of a narrowband (NB) primary synchronization signal (NPSS), a NB secondary synchronization signal (NSSS), a NB physical broadcast channel (NPBCH) for downlink synchronization, and a specific system information block (SIB) for the NB for essential system information in one or more sets of downlink subframes, each set of which comprises a set of consecutive subframes, in an internet-of-things (IoT) non-terrestrial network (NTN) time-division duplex (TDD) mode. This realizes NTN NB-IoT services.

This invention relates to a photoelectric conversion and beam combining device for multiple-channel reception of the same echo optical signal in lidar. The device includes: a sealed box, a single-photon detector, and multiple echo signal receiving lines. The multiple echo signal receiving lines receive the same echo optical signal, process the echo signal, and then transmit the processed optical signal to the single-photon detector. All echo signal lines are housed in the sealed box. Each echo signal receiving line includes: an echo signal fiber, a collimating and focusing lens group, and a narrowband filter. The echo signal fiber receives the echo optical signal. The collimating and focusing lens group includes a collimating lens and a focusing lens. The collimating lens shapes the optical signal into parallel light. The focusing lens focuses the parallel light. The narrowband filter filters out stray light and atmospheric background light from the optical signal. This invention simplifies the optical receiving system components of lidar, reduces system cost, and minimizes signal errors.