391results about How to "Reduce Design Complexity" patented technology

The invention discloses a method for verifying a digital circuit module in an integrated circuit, which belongs to the technical field of circuit testing and comprises the following specific steps: I, analyzing functional requirements and performance indexes of the circuit module and constructing a virtual model; iI, identifying abnormity and boundary conditions in the circuit module and generating a test case; iII, performing function verification on the circuit module and evaluating module performance; iV, optimizing the current circuit configuration according to a performance evaluation result; v, carrying out randomness verification on the circuit to detect potential vulnerability and design defects; according to the method, the circuit performance can be remarkably improved, the workload of manual parameter adjustment is reduced, the design complexity and verification difficulty are reduced, the performance of a circuit module in various scenes is improved, an input area which may cause problems can be focused on under limited test resources, the comprehensiveness and verification efficiency of the verification process are improved, and the verification efficiency is improved. And the stability evaluation of the circuit is more accurate, and the verification can be continuously improved.

The invention relates to a four-rotor unmanned aerial vehicle anti-interference trajectory tracking control method based on an observer and a tracking differentiator, and belongs to the field of aerial robot control. According to the method, various aerodynamic disturbances in the environment are estimated in real time by using the nonlinear disturbance observer; then, external interference estimated in real time is used as an interference compensation item of a sliding mode controller to obtain control laws of a four-rotor position subsystem and a four-rotor attitude subsystem, and meanwhile, an improved tracking differentiator is used for providing a smoother expected attitude signal; and finally, proving accurate estimation of the nonlinear disturbance observer on external disturbance through a global consistent final bounded stability theory, and proving the stability of the four-rotor control system through a Lyapunov method. A novel high-frequency switching function established in a control law is combined with an improved tracking differentiator, so that the buffeting problem of sliding mode control is effectively suppressed, and a nonlinear interference observer improves the anti-interference capability of four rotors; the control input buffeting is reduced while the robustness of the four rotors is improved.

The embodiment of the invention provides a data transmission method and device of a network-on-chip, electronic equipment and a storage medium. The method comprises the following steps: dividing at least two computing nodes with spatial topology into multicast domains; determining a target node for receiving the first message; according to a target multicast domain to which the target node belongs, adding a multicast control field in the first message to obtain a target message; determining a first routing path outside the target multicast domain according to the multicast control field and a routing algorithm; transmitting the target message to the target multicast domain based on the first routing path; determining a second routing path in the target multicast domain according to the intra-domain mask field; and sending the target message to the target node based on the second routing path. In the embodiment of the invention, the routing path of each message can be directly determined according to the multicast control field added in the message, so that the design complexity of the network-on-chip is reduced, and the data payload proportion and the data transmission efficiency of the network-on-chip are improved.

The invention discloses a semiconductor device and a preparation method thereof, a power module, a power conversion circuit and a vehicle, and relates to the technical field of semiconductors, a semiconductor body of the semiconductor device is set as a first conductive type, a first surface of the semiconductor body is provided with a gate trench, and a trench gate structure is located in the gate trench. The semiconductor body further comprises a first region of the first conduction type, a well region of the second conduction type and a second region of the second conduction type, and the second region and at least part of the first surface are connected with a source electrode of the semiconductor device to form Schottky contact. The Schottky contact reduces the conduction voltage drop, reverse recovery time and reverse recovery energy consumption of the semiconductor device, enhances the conduction performance and surge current resistance of the body diode, avoids the problem that holes enter a drift layer in the follow current process, reduces the risk of double-click degradation of the device, avoids an external follow current diode, and improves the reliability of the device. Therefore, the circuit design complexity and the system cost are reduced.

The invention discloses a power gating system, a power gating method and a system on chip. Relates to the technical field of power management, and comprises a central processing unit used for writing software power-down configuration information into a register module; the register module is used for triggering a software power-down request according to the software power-down configuration information and sending the software power-down request to the power gating controller; the system power consumption controller is used for determining a system power consumption mode according to the state of the central processing unit, triggering a hardware power-down request and sending the hardware power-down request to the power gating controller under the condition that the system power consumption mode is a low-power-consumption mode; and the power gate controller is used for detecting the state of a bus of the power domain based on the software power-down request or the hardware power-down request, and executing power-down time sequence control on the power domain under the condition that the state of the bus is detected to be an idle state. The technical problems that the power gating speed is low and the software overhead is large when the bus state is inquired through software with high complexity in the prior art are solved.

The invention belongs to the technical field of metamaterial structure design, and aims to solve the problem that metamaterial structure design depends on experience and manual adjustment. The invention provides a forward and reverse fusion design and performance prediction method for a mechanical metamaterial structure, and the method comprises the steps: designing N original metamaterial structures, and extracting N combinations of structure parameters and material parameters; carrying out modeling and simulation to obtain N characteristic parameter groups; constructing a dual-deep learning model comprising a front neural network and a rear neural network, and performing training based on the data; a combination of structure parameters and material parameters of the new metamaterial structure and performance parameters needing to be achieved are given, such as a low-frequency band gap value and a Poisson's ratio; inputting a new combination of structure parameters and material parameters into the double-deep learning model, and judging whether required performance is achieved or not based on characteristic parameters output by the neural network; and if so, outputting the reconstructed optimal original material structure by the post-neural network. According to the invention, the design complexity of the metamaterial can be reduced.

The invention discloses a lightweight epilepsy electroencephalogram signal four-classification method, and relates to the technical field of electroencephalogram signal processing. Integrating short-time Fourier transform, a spectrum reconstruction strategy, a one-dimensional convolutional neural network and a long-short term memory network, and constructing an electroencephalogram signal four-classification model; based on the trained electroencephalogram signal four-classification model, the electroencephalogram signals of the user serve as input, and the probability value that the electroencephalogram signals belong to each category is output; comparing the probability values of the four categories, taking the category with the maximum probability value as the category to which the electroencephalogram signal belongs, and sending a corresponding alarm according to the category to which the electroencephalogram signal belongs. Compared with traditional dichotomous and trichotomous models, the electroencephalogram signal four-classification model of the application brings features in the later period of attack into the range of recognition, the accuracy of the model is improved, and based on the lightweight design of the spectrum reconstruction strategy, the reliability of the model is improved. The lightweight epilepsy electroencephalogram signal four-classification method provided by the invention can be applied to edge wearable equipment scenes.

The invention relates to a dual-computer hot-standby satellite-borne cryptographic device, a main-standby switching method, a satellite and a communication system, and the dual-computer hot-standby satellite-borne cryptographic device adopts a single-board dual-computer hot-standby hardware architecture; comprising a cryptographic module A and a cryptographic module B which are mutually active and standby, and an RAM chip which is used as a shared memory of the cryptographic module A and the cryptographic module B, two one-way signal lines are connected between the password module A and the password module B, one signal line transmits main and standby signals of the password module A from the password module A to the password module B, the other signal line transmits main and standby signals of the password module B from the password module B to the password module A, and the main and standby signals are used for autonomous switching of dual-computer hot standby; and the RAM chip is used for storing state information required by main / standby switching. According to the invention, the reliability of satellite load service password processing is improved.

The invention provides a battery module and a battery life prolonging method thereof, the battery life prolonging method is applied to a battery management system, and a charger is controlled by the battery management system to charge a battery cell group. Before the battery cell group is charged, after a target charging electric quantity value of the battery cell group is set according to the battery health state of the battery cell group, a constant-current charging mode is entered, and a charger starts to charge the battery cell group. And then, calculating a charged electric quantity value of the battery cell group, and when the charged electric quantity value is greater than the target charging electric quantity value, ending the constant-current charging mode. Therefore, the aging condition of the battery is estimated before charging, different life prolonging strategies are adopted, and then the target charging electric quantity value of the battery is dynamically changed, so that the full capacitance can be gradually improved according to the aging degree, and the purpose of prolonging the service life of the battery is achieved.

The invention discloses a self-adaptive ultra-large field-of-view infrared image non-uniformity correction method, and belongs to the field of infrared image quality control. Firstly, an infrared camera laboratory radiometric calibration coefficient is used as correction input, initial parameters of non-uniformity correction are obtained through multi-scene image statistics, and then detector response with an ultra-large view field center and stable response is selected as a standard reference standard. Correcting the correction parameter of each pixel towards the two sides of the detector by adopting a specific sample matching technology according to a standard reference datum to finish the non-uniformity correction of a single detector module, then establishing a high-precision overlapping region correlation detection constraint model for adjacent detectors, and performing feature point matching correction by utilizing the overlapping pixels of the adjacent detectors to finish the non-uniformity correction of the single detector module. Correction parameters between adjacent detector modules are obtained and transmitted in sequence, so that gray level balancing of the multiple detector modules of the infrared camera is achieved, finally, full-field-of-view image self-adaptive dynamic stretching is achieved through histogram statistics, and non-uniformity correction of the whole image is achieved.

The invention provides an oblique incidence high-efficiency broadband long-wave light splitting film, the working angle of the light splitting film is 45 degrees, an equivalent relation of double-sided design and single-sided design under oblique incidence is established through numerical calculation, 45-degree single-sided transmittance and reflectivity target values are set, and film system matching is performed by adopting a design method of alternating three refractive indexes. And then the same film system is plated on the two surfaces of the long-wave infrared substrate respectively, so that the preparation of the beam splitting film is realized. The objective of the invention is to realize high-efficiency light splitting of a long-wave infrared window in a transmittance / reflectivity ratio of 1: 1 in a wave band range of 7 [mu] m-12 [mu] m under 45-degree inclined incidence, and the light splitting film has the advantages of stable performance and small surface shape change, and is suitable for optical systems for imaging, detection and the like.

The invention discloses an instruction processing system and an instruction processing method, and the system comprises a storage unit which is used for storing a target instruction; the decoding unit is connected with the storage unit; the processing unit is connected with the decoding unit; the illegal instruction monitoring unit is connected between the storage unit and the decoding unit, and the illegal instruction monitoring unit is used for determining the legality of the target instruction according to a preset coding format and the coding format of the target instruction, and indicating that the target instruction is an illegal instruction in response to the legality; and normalizing the target instruction into a normalized illegal instruction, and outputting the normalized illegal instruction to a decoding unit for decoding to obtain a decoding result, so that a processing unit performs corresponding processing according to the decoding result. According to the embodiment of the invention, the design complexity and difficulty of the decoder can be reduced, and the program execution efficiency is improved.

The invention discloses a packaging method of a power semiconductor packaging structure based on DBC interconnection, and the method employs a DBC interconnection mode, and compared with a conventional metal wire bonding mode, an upper DBC board and a lower DBC board are connected through a large-size copper column, the mode is beneficial to reducing stray inductance, and the copper column can also enhance the heat dissipation effect. According to the phase change material provided by the invention, the nano silicon nitride is generated on the surface of the carbon fiber in situ, and through in-situ synthesis, the nano silicon nitride can form a uniform coating on the surface of the carbon fiber, so that the problem of particle aggregation in the blending process is avoided, and meanwhile, an in-situ generation mode is adopted, so that an effective heat conduction path can be formed on a microstructure; thermal interface thermal resistance is reduced, and heat conduction efficiency is improved, so that the heat conduction performance of the phase-change material is improved; and then stearic acid is adopted to treat the carbon fiber loaded nano boron nitride material, so that the dispersing performance of the carbon fiber loaded nano boron nitride material in paraffin is improved, and the heat conduction efficiency is further improved.

The invention discloses an AI-AD intelligent machine design method and system based on a learning-generation mode. The method comprises the following steps: S1, enabling an AI-AD intelligent mechanical design system to understand design knowledge at first; s2, compiling a workflow with low codes; s3, compiling a Prompt strategy of the design Agent and a called knowledge base; s4, repeating the steps S1 to S3, and compiling various agents needing to complete various specific design functions; s5, according to the designed various agents, a multi-agent self-organizing framework is utilized, and product creation type design is completed; and S6, according to the generated design result, generating a VBA file and storing the VBA file in the cloud. And S7, the SW establishes a conversation with the agent through a back-end API of the agent, timely reads a VBA code of the cloud for modeling, and outputs a model. According to the invention, a system structure of knowledge processing, cloud data storage, SolidWorks-based secondary development modeling and a human-computer interface module is constructed, Agents are enabled to learn at first, then design is created, and a 3D model meeting user requirements is generated, so that the current situation that knowledge engineering has extremely high requirements for practitioners' admission threshold can be reduced.

The invention discloses a parallel-serial conversion circuit based on a composite dielectric gate photosensitive detector, and belongs to the field of integrated circuits. The parallel-serial conversion circuit comprises a composite dielectric gate photosensitive detector pixel, a ramp generator, a clamping circuit, a switch S1, a pre-charging circuit, a comparator, a counter, 8-256 decoders, a first AND gate, 256 second AND gates and a 256 input OR gate. According to the parallel-serial conversion circuit, all digital circuit parts are converted into analog circuits, so that the circuit design complexity is reduced, the circuit simulation and layout design iteration period is shortened, the power consumption and the area of a chip are effectively reduced, and the design of a subsequent miniaturized system is facilitated.

The invention belongs to the technical field of blood oxygen detection, and particularly relates to a non-invasive blood oxygen detection method. The main machine shell is arranged on the upper portion of the blood oxygen machine, a blood oxygen sensor is arranged below the blood oxygen machine and electrically connected with the main machine shell, the main machine shell comprises a single chip microcomputer, an analog front end driving module, a display module, a circuit module, a signal receiving module, a digital signal processing module and a storage module, and meanwhile a lithium battery is arranged in the main machine shell. A power supply is provided for the oximeter; the blood oxygen sensor is directly connected with the signal receiving module to form a blood oxygen signal receiving module, and the blood oxygen signal receiving module is connected with the digital signal processing module to convert a voltage signal into a digital signal; according to the invention, the problem that detection signal pulse wave output signals are interfered by serious noise such as environmental noise and hardware circuits is solved; the problems of signal loss and signal superposition caused by a traditional filtering method are solved.

The invention discloses a programmable metasurface unit chip and a programmable metasurface, and the unit chip sequentially comprises a first dielectric layer, a first bonding dielectric layer, a controllable metal layer, a second bonding dielectric layer, a third dielectric layer, a third metal layer, a third bonding dielectric layer, a fourth dielectric layer and a fourth metal layer from top to bottom. The controllable metal layer comprises a metal structure and a controllable element and is used for forming two isolation electromagnetic wave regulation and control channels so as to independently control orthogonal polarization electromagnetic waves and provide independent and controllable electromagnetic response for the incident orthogonal polarization electromagnetic waves; the third metal layer is used as a radio frequency ground for improving the electromagnetic wave reflection performance; the fourth metal layer is used for inputting bias voltage; and bias voltage is loaded to the controllable element through the metal holes of each layer. The plurality of unit chips are arranged on the substrate in an array mode to form the metasurface. The unit chip provided by the invention can greatly reduce the design and implementation complexity of the metasurface, reduce the production and maintenance cost, and promote the application of the metasurface in a wireless information system.

The invention relates to an output waveform control device and method, a test device and a test system, and the device comprises a waveform synthesis module which is used for carrying out the waveform format synthesis of a received original data stream according to a configured waveform format, and obtaining a synthesized waveform; the output signal delay module is connected with the waveform synthesis module and the to-be-tested device, and is used for carrying out delay processing on the synthesized waveform according to a configured output delay value to obtain an output waveform and transmitting the output waveform to the to-be-tested device; wherein the output signal time-delay module comprises at least two basic time-delay units, the basic time-delay units are sequentially connected in series, the basic time-delay unit located at the head end is connected with the waveform synthesis module, and the basic time-delay unit located at the tail end is connected with a device to be tested. And a waveform output function can be realized by adopting a universal chip, so that the design complexity is reduced.

The invention relates to a signal jump edge rise time detection device and method, and the device comprises an XOR combinational logic module which is used for carrying out the XOR logic processing of a comparison signal outputted by a PE module, and obtaining a feed-in signal; the control module is connected with the XOR combinational logic module and is used for sampling and analyzing the feed-in signal and determining the time difference between the front edge and the rear edge of the feed-in signal; the rising time of the signal edge is calculated according to the time difference and the front and back edge delay parameters sent by the carry chain module; and the carry chain module is connected with the control module, and is used for obtaining delay parameters corresponding to the front and rear edges of the feed-in signal when the control module determines the front and rear edges of the feed-in signal, obtaining the delay parameters of the front and rear edges, and sending the delay parameters to the control module. The rising time of the signal edge is obtained by analyzing the time difference between the front edge and the rear edge of the feed-in signal and combining the delay parameters corresponding to the front edge and the rear edge of the feed-in signal, the rising time of the signal jump edge can be detected by adopting a universal chip, and the design complexity is reduced.

The invention discloses a reconfigurable computing array, a reconfiguration controller architecture, a chip and a reconfiguration computing method. The reconfigurable computing array comprises a main control module, a state machine module, a computing decoder module, a memory access resource controller module, a reconfiguration controller module, the reconfigurable computing array, an input buffer area module and an output buffer area module. The state machine module controls the whole reconstruction calculation process through state switching; the reconfiguration controller module configures the connection mode of PE units in the reconfigurable computing array according to the decoding result of the computing decoder module, and various computing functions are achieved so as to complete different types of data computing tasks. According to the method, the multiple computing units in the reconfigurable computing array are dynamically configured, so that a hardware architecture can be adjusted in real time according to different algorithm requirements, the reconfigurable computing array is accurately configured to complete different computing tasks, special hardware does not need to be designed for each task, and the computing efficiency is improved. Therefore, the flexibility of chip configuration and the resource utilization rate are improved.

The invention discloses a millimeter wave up-down conversion module, which comprises an intermediate frequency transmit-receive change-over switch and a radio frequency transmit-receive change-over switch, and two links, namely an up-conversion link and a down-conversion link, are arranged between the intermediate frequency transmit-receive change-over switch and the radio frequency transmit-receive change-over switch. The up-conversion link sequentially comprises an intermediate frequency amplifier, a hybrid coupler and a quadrature up-converter. The down-conversion link includes a down-converter. In addition, a local oscillator circuit provides local oscillator signals for the quadrature up-converter and the quadrature down-converter. And a radio frequency balun transformer II is connected with the radio frequency transmit-receive change-over switch. The millimeter wave up-down conversion module has two working modes, namely a transmitting mode and a receiving mode. The signal passes through the up-conversion link in the transmitting mode, and the signal passes through the down-conversion link in the receiving mode. The up-down conversion module has the advantages of good image rejection ratio, low local oscillation leakage, broadband matching, small area and low design complexity.

The embodiment of the invention relates to a processing method and device for a large language model introducing conditional constraints. The method comprises the steps that a corresponding first state prediction model is customized for each conditional rule; creating a corresponding model training data set for each condition rule to train a corresponding first state prediction model; marking any type of large language model which is realized based on a Transform architecture and has been subjected to pre-training and fine tuning as a first large language model; selecting all the first state prediction models corresponding to one or more condition rules to establish a multi-rule state prediction model, and adding the multi-rule state prediction model and a constraint decoding control module on the basis of the first large language model to form a second large language model; and performing corresponding constraint text generation processing according to the user input text based on the second large language model, and outputting a corresponding constraint generation text to be fed back to the user. According to the method, the rule adaptation flexibility of the model can be improved, the calculation amount is reduced, and the timeliness is improved.

The invention relates to an LED driving device, a column driving chip and a row driving chip, and the LED driving device is used for driving an LED array. The device comprises a main control unit, a column driving unit and at least one row driving unit, wherein the column driving unit and the row driving unit correspond to each LED array; the column driving unit corresponding to the LED array is used for controlling each row driving unit corresponding to the LED array; the main control unit is used for sending a main control signal to control the column driving unit; the column driving unit is used for receiving the main control signal, providing driving current for each column of LEDs in the LED array needing to be driven according to the main control signal, and generating and sending a row control signal to the row driving unit controlled by the column driving unit according to the main control signal; the row driving unit is used for receiving a row control signal and controlling corresponding row channels in the LED array to be opened or closed; according to the LED driving device, the design complexity can be reduced, and the design freedom degree and flexibility can be improved.

The invention provides a radio frequency transceiver system and an interference signal suppression method thereof, and the transmitter system comprises a first power divider which divides a local oscillator signal into a first local oscillator signal and a second local oscillator signal; the first bridge divides an intermediate-frequency input signal into an intermediate-frequency I + signal and an intermediate-frequency Q + signal. The first filter divides the first local oscillator signal into a local oscillator I + signal and a local oscillator Q-signal; the first frequency mixer mixes the intermediate frequency I + signal and the local oscillator I + signal to obtain a first frequency mixing signal; the second frequency mixer mixes the intermediate frequency Q + signal and the local oscillator Q-signal to obtain a second frequency mixing signal; the second power divider synthesizes the first frequency mixing signal and the second frequency mixing signal to obtain a first signal to be coupled; the first phase shift amplification module performs phase shift and amplification on the second local oscillator signal to obtain a second to-be-coupled signal; the first coupler couples the first to-be-coupled signal and the second to-be-coupled signal and outputs a radio frequency signal. According to the technical scheme of the embodiment, the design complexity can be reduced, and the performance of the radio frequency transceiving system is improved.

The invention discloses an interface circuit and a connector, the interface circuit comprises a male head connecting end, a female seat connecting end and a control module, the male head connecting end is provided with a first male head pin and a second male head pin, the female seat connecting end is provided with a first female seat pin and a second female seat pin, and the control module is used for controlling the first male head pin and the second male head pin when determining that second equipment supports data communication. The target male head pin is controlled to be connected to the first device according to a target female seat pin connected with the second device, the target female seat pin is one of the first female seat pin and the second female seat pin, and the target male head pin corresponds to the target female seat pin. According to the interface circuit provided by the invention, the line sequence of the high-speed signal can be ensured to meet the requirement under the condition that a multiplexer is not needed, so that the first equipment and the second equipment can carry out data communication, screen projection is realized, the design complexity of the circuit is reduced, the circuit structure is simplified, and the cost is reduced.

The invention belongs to the field of aircraft thrust management, and particularly relates to an implementation method of a thrust-reduced takeoff function of an aircraft. The method comprises the following steps: step 1, determining a thrust-reducing takeoff scheme, and dividing the thrust-reducing takeoff scheme into two thrust-reducing levels, namely a first thrust-reducing level and a second thrust-reducing level; wherein the first thrust reduction level adopts a level thrust reduction mode, and the first thrust reduction level comprises a plurality of thrust reduction levels; setting a second thrust reduction level between the first thrust reduction level and the second thrust reduction level, wherein the second thrust reduction level adopts a flexible temperature thrust reduction mode; step 2, converting the thrust value of each thrust reduction grade under the standard condition into a takeoff weight grade according to an equal thrust-weight ratio mode; and 3, selecting a thrust reduction level according to the takeoff weight to calculate the takeoff performance, judging whether the selected thrust reduction level meets the takeoff requirement or not, if so, taking off by using the current thrust reduction level, and otherwise, entering judgment of the next thrust reduction level.

The invention discloses a frequency multiplexing implementation method of a ground-air broadband communication system, which comprises the following steps: setting a plurality of multiplexing frequencies for aggregating downlink subcarriers for the ground-air broadband communication system, the plurality of multiplexing frequencies multiplexing the frequency of a ground operator system; arranging a ground-air system base station which is spatially isolated from a ground same-frequency network base station of the ground operator system for the ground-air broadband communication system along an air route according to the plurality of multiplexing frequencies; according to the coverage condition of a plurality of multiplexing frequencies in the ground operator system, selecting an actual multiplexing frequency for the laid ground-air system base station from the plurality of multiplexing frequencies; and realizing ground-to-air communication of the ground-to-air broadband communication system by using the actual multiplexing frequency of the ground-to-air system base station. According to the frequency multiplexing technology, the inter-system co-frequency interference caused by frequency multiplexing can be reduced, and the design complexity and the construction cost are low.

The invention discloses a multi-channel sampling circuit hybrid error modeling and cyclic calibration method, and belongs to the technical field of signal sampling. The method comprises the following steps: constructing a system error model, and introducing polynomial series to realize model simplification; generating a reference signal participating in error cycle calibration according to the simplified hybrid error model; initializing a frequency response function of each sampling channel, and calculating an initial tap coefficient of an error correction module; a cascade multi-order error correction structure is used for completing reference signal error iteration correction, so that the reference signal error continuously approaches to an input signal; correcting the signal to calculate a loss function, and completing estimation and updating of a tap coefficient; and judging whether the loss function reaches a convergence condition or not until hybrid error cyclic calibration is realized. On the basis of the reference signal constructed by the hybrid error model, low-complexity online blind cycle calibration is realized, the precision and completeness of the system error model are improved, the quantity of parameters to be estimated and the number of sample points for calibration are remarkably reduced, and the calibration efficiency is improved.

The embodiment of the invention provides a multi-frequency miniaturized omnidirectional indoor distribution antenna, and belongs to the technical field of antennae, the multi-frequency miniaturized omnidirectional indoor distribution antenna comprises a grounding plate, a dielectric substrate and a feed member, and the grounding plate and the feed member are respectively and correspondingly arranged on two opposite surfaces of the dielectric substrate; a radiation slot and at least one notch slot are formed in the grounding plate, the radiation slot is of an annular structure, the notch slot is located on the outer side of the radiation slot, and the notch slot is in an arc shape concentric with the radiation slot. According to the multi-frequency miniaturized omnidirectional indoor distribution antenna provided by the embodiment of the invention, the problems that an omnidirectional indoor distribution antenna in the prior art is difficult to realize broadband multi-frequency characteristics, relatively high in profile and complex in design are solved.

The invention relates to the technical field of optical design, in particular to a method for designing an initial structure of an optical system based on first-order quantity, which comprises the following steps of: randomly assigning the focal power of other elements except the last element and the interval between adjacent elements, and calculating the focal power of the last element according to system design requirements; the method comprises the following steps: setting an objective function according to the focal power of the element and the interval between the element and a detection surface, searching focal power and interval distribution data of the element when the objective function value is optimal by using a global algorithm, and modeling and optimizing through optical design software. According to the method, optimization variables in the optical design process are simplified, on the premise that the initial structure design accuracy is not reduced, the traditional optical design process is simplified, the design complexity is reduced, and the problems that a traditional design method is low in design efficiency, computing resources are wasted and the like are effectively solved.