47results about How to "Improve anti-jamming" patented technology

The invention relates to a radar communication technology, and discloses a decentralized distributed node time-frequency phase synchronization method, which comprises a time synchronization step: sending signals from an initial radar station to complete a first round-trip cycle until all radar stations receive and transmit signals twice; each radar station obtains a time synchronization error estimation value of signals sent by two adjacent stations so as to carry out time synchronization correction; a frequency and phase synchronization step: starting to send a signal carrying the carrier frequency and the initial phase from the initial radar station to complete a second round-trip cycle until all radar stations transmit and receive signals carrying the carrier frequency and the initial phase twice; and each radar station obtains a carrier frequency estimation value and a phase estimation value of sending signals from two adjacent stations, the carrier frequency estimation value serves as a synchronous frequency, the two phase estimation values of the two adjacent stations are added to serve as a synchronous phase, and frequency and phase correction is performed by using the synchronous frequency and the synchronous phase.

According to the frequency polarization reconfigurable transmission array antenna unit and the transmission array antenna, an orthogonal crisscross radiation patch is used as emission layer metal of the antenna unit, and polarization conversion and phase switching of the unit in different frequency bands are realized by controlling output voltage of a circuit to change on-off states of four diodes; therefore, the characteristics of high gain, high interference resistance, high polarization matching degree, high flexibility, adjustable polarization and beam scanning of the transmission array antenna are realized. Meanwhile, as the orthogonal cross-shaped radiation patch is used as the transmitting unit, and the X-polarization rectangular receiving patch is used as the receiving unit, both the transmitting unit and the receiving unit are printed on the dielectric plate, the structure is simple and compact, the processing is convenient, and the cost is low.

The invention discloses a mechanical arm trajectory tracking sliding mode control method and system based on a predetermined sliding set. The method comprises the steps that a motion equation representing a mechanical arm dynamic model is established; according to the motion equation, mechanical arm tail end joint angular displacement and angular velocity are selected as state vectors, and a mechanical arm state space model is established; according to the expected tracking trajectory, a mechanical arm tracking error vector is obtained, and a mechanical arm tracking error kinetic equation is established in combination with the mechanical arm state space model; selecting a sliding variable according to the tracking error information of the mechanical arm; a self-adaptive sliding mode tracking control law is established in combination with the sliding variable, and the sliding variable of the tracking error of the tail end joint of the mechanical arm is restrained in combination with a Lyapunov function stability analysis method; according to a Lyapunov function direct method, stabilization control integration is carried out on the constrained sliding variables, it can be ensured that a mechanical arm tail end joint tracking system cannot lose a preset sliding mode, and therefore the anti-interference performance, the fault tolerance performance and other robust performance are improved.

The invention relates to the field of telecommunication, in particular to a distributed acquisition and control networking method. The method comprises the following steps: optical distributed acquisition and control host equipment is in communication connection to form an optical distributed acquisition and control host core looped network; the two optical distributed acquisition and control host devices control one slave optical fiber hand-in-hand connection device to perform management and communication dual-machine redundancy between the two optical distributed acquisition and control host devices, and the two optical distributed acquisition and control host devices form an optical distributed control looped network; the slave optical fiber hand-in-hand connected equipment module is linked with the detection equipment, and the data acquisition efficiency of the optical distributed control ring network is calculated; judging whether one of the optical distributed acquisition and control host equipment is in a disconnected state or not; and calculating the time delay of the slave optical fiber hand-in-hand connection equipment communication connection detection equipment. The problem that monitoring and control are directly influenced by communication interruption among equipment in a part of areas in optical fiber communication is solved; and after the optical distribution type acquisition and control host equipment breaks down, the whole networking cannot work if the dual-redundancy backup is lacked, and the like.

The invention relates to the technical field of anti-deception navigation, and discloses a dynamic anti-deception navigation method and system for an unmanned aerial vehicle, and the method comprises the steps: obtaining a signal of a satellite navigation system in the flight process of the unmanned aerial vehicle, and detecting and identifying a potential interference signal; adjusting filter parameters in real time according to the motion state of the unmanned aerial vehicle, and filtering noise and jump signals; when the signal of the satellite navigation system is seriously interfered, the signal of the satellite navigation system and the data of the inertial measurement unit are subjected to data fusion, short-time navigation of the unmanned aerial vehicle is maintained, and dynamic anti-interference deception of the unmanned aerial vehicle is realized. According to the method, interference and deception signals can be accurately identified and filtered by adopting multi-dimensional signal detection and analysis of multi-frequency multi-antenna receiving, time propagation error, power estimation, pseudo-range consistency and the like. When satellite navigation signals are seriously interfered, short-time navigation is carried out through IMU data, and it is ensured that the unmanned aerial vehicle keeps flight stability and navigation continuity in a complex environment.

The invention provides a satellite communication system based on Beidou RDSS. The satellite communication system specifically comprises a receiving channel and a transmitting channel. A receiving channel adopts a low-intermediate frequency structure, an antenna receives a radio frequency signal, the radio frequency signal is directly down-converted into a low-intermediate frequency signal through a mixer, and then the low-intermediate frequency signal is converted into a baseband signal through an analog-to-digital conversion chip. The system adopts a low-intermediate frequency structure and uses primary frequency mixing, so that compared with secondary frequency mixing of a superheterodyne structure, the system has the advantages of simple link, low cost, low power consumption, high integration and the like. Meanwhile, the system is down-converted to low-intermediate frequency, and low-intermediate frequency signals are far away from direct current, so that the problems of direct current offset, flicker noise and the like of the system are solved. A transmitting channel adopts a direct frequency conversion structure, and a baseband signal skips an intermediate frequency stage through a frequency mixer and is directly up-converted to a radio frequency signal transmitted by an antenna. The system not only ensures the advantages of simple link, low cost, low power consumption, high integration and the like of the system, but also improves the stray problem of signals transmitted by the system.

The invention discloses an intelligent monitoring high-flame-retardant water-blocking long-distance symmetrical communication cable, which comprises a communication line group, a plurality of intelligent monitoring units, a flame-retardant structure, a water-blocking structure, a shielding structure, an oxygen isolation structure and an outer sheath, and is characterized in that the plurality of intelligent monitoring units are uniformly distributed along the length direction of the communication line group and form a cable core together with the communication line group; the flame-retardant structure, the water-blocking structure, the shielding structure and the flame-retardant oxygen-isolating structure are all arranged between the cable core and the outer sheath, the intelligent monitoring unit comprises a monitoring module, a data processing module and a communication module, and the monitoring module is composed of a temperature sensor, a humidity sensor, a strain sensor and a current monitor. The data processing module is electrically connected with the monitoring module on one hand, and communicates with a remote monitoring center through the communication module on the other hand, so that moisture can be effectively prevented from invading into the cable, and the cable has good transmission performance, monitoring function and water-blocking and flame-retardant performance, and can autonomously monitor the operation state and perform early warning and positioning on faults.

The integrated microfluidic detection chip comprises a liquid conveying channel, the upper end and the lower end of the liquid conveying channel are each provided with an inlet, the center position of the side end of the liquid conveying channel is communicated with a mixing channel, the other end of the mixing channel is communicated with a flow velocity difference channel, and the flow velocity difference channel is communicated with a flow velocity sensor. An electrode detection disc is arranged on the side face of the flow velocity difference channel in a communicating mode, and a circular barrier is fixedly arranged in the electrode detection disc. Compared with a traditional detection chip, the integrated microfluidic detection chip based on dual-channel flow velocity difference vortex enhancement has the following remarkable advantages: a breakthrough in mass transfer limit is achieved: through multiple physical coupling of dual-channel flow velocity difference, incident angle optimization and a circular barrier, substance transmission is converted from single molecule diffusion to active vortex driving; the bottleneck that mass transfer of a microfluidic system is limited is solved, and in-situ dynamic refreshing of a detection interface is realized by an automatically generated discrete sample injection mode.

The invention provides a health-care feed additive for enhancing animal immunity and a preparation method thereof, and belongs to the field of feed additives. The preparation method comprises the following steps: preparing a composite enzymatic hydrolysate, preparing a composite extracting solution, preparing a pre-composite carrier, modifying the carrier, and mixing the preparation. The health-care feed additive capable of enhancing the animal immunity can effectively reduce the dosage of antibiotics in the animal feeding process, can improve the animal immunity through the synergistic and stable cooperation of various plant components and other raw materials, and can condition animal bodies in a health-care manner, and the utilization rate of the plant components is high; the stability, the anti-interference performance and the anti-oxidation performance of plant components in the feed additive are improved, and the storage resistance of the feed additive is improved.

The invention belongs to the technical field of optical thin film detection, and particularly discloses an optimization method of an optical thin film detection system, which is used for solving the problems of weak interference resistance, poor pollution resistance and insufficient complex scene adaptation of the traditional detection system. The method comprises the following steps: pre-selecting a light needle beam with a needle-point-shaped cross section as a light source, defining a source plane light field, and constructing a limited energy generation condition through apodization operation; setting a plurality of groups of regulation and control parameters for three transmission states of diffraction, non-diffraction and focusing; building an experiment system to generate a directional light needle light beam, simulating pollution and interference scenes, and collecting light field data of different transmission nodes before and after interference; and quantizing the light field similarity through a witness function, screening an optimal regulation and control parameter, and integrating the optimal regulation and control parameter to a detection system. According to the invention, the anti-interference and information stability are improved from the light source essence, the method is adaptive to ultrathin, multi-layer thin film and complex environment detection, the detection precision and long-term stability are obviously improved, and both practicability and economy are taken into account.

The utility model relates to the technical field of automobile wire and discloses high-soft high-strength copper-clad steel automobile wire for business car, include: conductor unit and insulating sheath, the insulating sheath is covered in the outside of conductor unit, the conductor unit includes inner stranding layer and outer stranding layer, the outer stranding layer concentric stranding constitutes with inner stranding layer, the outer stranding layer is stranding in the outside of inner stranding layer, the inner stranding layer is stranding constitutes by tensile metal wire, the outer stranding layer is stranding constitutes by conducting wire; The insulating sheath includes first insulating layer, metal braid, stress release ring and second insulating layer. The utility model discloses by setting up by tensile metal wire and conducting wire respectively stranding constitutes and concentric stranding's inner, outer stranding layer, guarantees conductivity and promotes tensile strength and flexibility, solves the problem that pure copper conductor wire is easy to break, reduces weight and improves efficiency, also overcomes the problem of aluminum conductor space occupation, and the outer layer insulating sheath structure realizes excellent insulation and mechanical protection, reduces the risk of breakage.

The invention provides an encoder based on a transmission and reflection scheme, comprising: a scale grating, an indicating grating, a photoelectric receiver, a light source and a reflection switch group; the scale grating is provided with a vernier code channel group for single-turn counting and a Gray code channel group for multi-turn counting, the vernier code channel group is located in the transmission area of ​​the scale grating, the Gray code channel group is located in the transmission area and the reflection area of ​​the scale grating, and the Gray code channel group includes at least two Gray code channels; the reflection area of ​​the invention is located at the installation position of the scale grating and the rotating shaft, the position is not used in the existing encoder, and the total number of code channels is increased by using the position, which can be used for miniaturization of the encoder; the invention improves the calibration margin of the encoder by increasing the number of Gray code channels, thereby improving the fault tolerance of the encoder; the invention applies the reflection switch to the multi-turn counting of the encoder to avoid the limitation of the tube voltage drop of the light source on the multi-turn counting.

The invention discloses an unmanned aerial vehicle self-locking switch system and a control method thereof, and relates to the technical field of unmanned aerial vehicles. The system comprises a switch button, an auxiliary power module, a main power module, a self-locking unit, a control unit and an electric quantity display unit, stable startup and shutdown are achieved through dual-time-sequence button control that first pressing lasts for a first preset time and second pressing lasts for a second preset time in cooperation with a time-sharing cooperation mechanism of auxiliary power and main power, the self-locking unit locks the switch state, and the electric quantity display unit displays the electric quantity. And accidental on-off caused by signal jitter is avoided. The system is extremely low in leakage current in a shutdown state, effectively prevents battery over-discharge, has electric quantity display and state feedback functions, and remarkably improves the reliability, safety and user experience of the switch.

The invention relates to the technical field of tunnel engineering, aims to solve the problems that an existing flexible connector is prone to breakage when being impacted, the protection effect is difficult to achieve, the connector and a tunnel lining are prone to damage, and potential safety hazards are caused, and provides a tunnel lining self-adaptive segment flexible connecting structure. Comprising a flexible connector arranged between two adjacent secondary lining sections, and the two ends of the flexible connector are used for being connected with the ends of the secondary lining sections on the two sides of the flexible connector respectively; the flexible connector comprises a framework, the interior of the framework is of a hollow structure, and the framework has rigidity and elasticity and can prevent the framework and a lining from being damaged and adapt to tunnel deformation; the flexible connecting structure has certain rigidity, so that the secondary lining section joints have high rigidity, and the secondary lining section joints are not prone to breakage when subjected to large earthquake damage or large-scale energy impact; and in addition, high elasticity and restorability are achieved, large deformation can be adapted, and the anti-dislocation capacity of the tunnel structure is improved.

The present invention proposes a method for determining the boundary line between a ship and the water surface, comprising the following steps: applying a deep learning algorithm to pre-determine whether the current recognition scene belongs to a double interface or a triple interface, and the color composition of the main body of the hull; detecting the hull edge of the image by RGB and HSV to obtain a contour line object group, applying the hull color matrix to comprehensively determine the contour line of the boundary between the hull and the water surface, and preliminarily locating the water surface boundary line A; enhancing the contrast of the images on both sides of the interface and the contrast between the boundary line and the images on both sides; dividing the image area processed by HSV superposition and RGB superposition and longitudinally, and taking the water surface boundary line A as the low point, obtaining a slice group, measuring each slice separately, and calculating to obtain a value group; fitting the value group into a boundary line array with the same width as the output image and outputting it for water gauge measurement. The present invention can effectively solve the problem of accurate positioning of the water surface boundary line in ship water gauge measurement.

A method for calculating the energy expenditure of experimental mice based on behavior tracking, relating to the fields of computational behavioral science and physiology, mainly includes the following steps: experimental data acquisition; foreground mask generation based on adaptive background subtraction; generating target detection rectangles for the mice in all video frames to determine the real-time position of the experimental mice; calculating the macroscopic displacement energy of the experimental mice at each moment during movement; processing to obtain the energy features of the microscopic movements of the experimental mice; performing feature fusion to construct a binary feature vector and inputting it into a gradient boosting tree (XGBoost) regression model to jointly map and obtain the energy expenditure of the experimental mice at each moment. This invention achieves metabolic energy expenditure prediction with high consistency with the gold standard of indirect calorimetry by constructing a dual-flow continuous physical quantification model that integrates macroscopic displacement work and microscopic spectral energy.

This invention relates to the field of insulated control cable technology and discloses an anti-interference flame-retardant plastic insulated control cable, comprising: a conductor, the conductor being wrapped with a moisture-absorbing self-healing insulating transition layer, the moisture-absorbing self-healing insulating transition layer being provided with a thermochromic magnetic shielding transition layer, the thermochromic magnetic shielding transition layer being provided with a compressive self-tightening conductive coupling layer, and the compressive self-tightening conductive coupling layer being covered with a thermally conductive and temperature-equalizing buffer layer; and further comprising: an anti-collision component installed outside the thermally conductive and temperature-equalizing buffer layer; by setting the anti-collision component, using magnetic frames, magnetic V-shaped frames with the same polarity magnetic repulsion and reset spring reset buffer, the defects of traditional cables lacking dedicated anti-collision components and easily causing functional layer misalignment due to external force are solved, significantly improving mechanical impact and compression resistance, ensuring the stability of the moisture-absorbing self-healing insulating transition layer and the thermochromic magnetic shielding transition layer, maintaining reliable signal transmission and anti-interference performance, and adapting to complex industrial bending and impact conditions.

The application provides a kind of time sequence feature and causal decoupling light weight ViT industrial hidden danger detection method in the technical field of industrial safety detection, comprising the following steps: first, obtaining industrial inspection image and preprocessing into standardized image, then constructing embedded local feature enhancement module and light weight improved Vision Transformer network, extracting enhanced local feature map;Further introduce the mechanism of physical guided causal decoupling, decompose the feature into real hidden danger, environmental interference and background residual, compare the similarity by differentiable counterfactual intervention, and output the interference discrimination reason;At the same time, cross-frame time sequence feature fusion is adopted to align continuous multi-frame features to distinguish hidden dangers and transient interference;Finally, combined with the discrimination reason, the light weight network outputs the industrial hidden danger detection result.The application has the advantages that: it greatly improves the anti-environmental interference ability, weak target perception accuracy, real hidden danger and transient interference time sequence causal discrimination ability, model explainability and end-side real-time deployment efficiency of industrial hidden danger detection.

This invention discloses a high-transmittance adaptive focusing liquid crystal lens structure and standardized preparation method supporting polymer nanotransmission, belonging to the field of intelligent wearable optical devices and nanomaterial transmission technology. The lens adopts a four-layer integrated stacked structure consisting of a wear-resistant and anti-fouling blue light blocking protective layer, a polarization-independent gradient refractive index liquid crystal focusing layer, a nano-metasurface polarization conversion layer, and a high-transmittance substrate layer. A carbon nanotube-graphene-polyimide composite polymer nanotransmission interface is integrated at the edge. Through a precise 45°±0.3° angle between the metasurface layer and the liquid crystal molecule director and a bipolar polarizer composite liquid crystal design, it achieves a transmittance ≥82%, polarization independence ΔT ≤3.2%, focusing response ≤180ms, steady-state error ≤±0.10D, and nanotransmission loss ≤3% under polarizer-free conditions. It can be adapted to -10.00D to +6.00D myopia / hyperopia and ±6.00D astigmatism correction. This invention features a standardized six-step mass production process, with a single-piece manufacturing time of ≤90 minutes and a yield of ≥95%, completely solving common industry pain points such as low light transmittance, polarization dependence, high transmission loss, inconsistent processes, and difficulty in large-scale mass production of traditional liquid crystal lenses. This invention boasts an original structure, novel process, and performance comprehensively superior to similar international technologies, possessing extremely high patent licensing value and industrial mass production value.

The invention provides a public network ultra-long-distance low-delay communication gateway for a weak signal environment, and aims to solve the problem that signals are weak or no signals exist in weak public network areas (such as urban underground parking lots and remote mountainous areas), a WIOTa wireless communication LPWAN protocol is adopted, the WIOTa protocol is used as a supplement of communication technologies such as 5G and the like, and the weak signal environment-oriented public network ultra-long-distance low-delay communication gateway is provided. Through fusion of a 5G high-broadband technology and a WIoTa asynchronous mechanism, the problem of high time delay of a traditional Internet of Things technology, the problem of signal seamless coverage of underground space and the problem of long-distance transmission coverage of remote mountainous areas are effectively solved, and a spectrum optimization algorithm is further designed, so that the vehicle network interaction efficiency is improved.

The utility model discloses a high-temperature-resistant flexible cable for a mining vehicle-mounted engine sensor, and relates to the technical field of wires and cables, the high-temperature-resistant flexible cable comprises a wire core, the wire core is composed of a plurality of copper wires, the outer wall of the wire core is wrapped with a protective layer, the inner wall of the protective layer is fixedly connected with the outer wall of the wire core, and the outer wall of the protective layer is wrapped with a waterproof layer. The inner wall of the waterproof layer is fixedly connected with the outer wall of the protective layer, the outer wall of the waterproof layer is wrapped with an anti-interference layer, the inner wall of the anti-interference layer is fixedly connected with the outer wall of the waterproof layer, and the outer wall of the anti-interference layer is wrapped with a flame-retardant layer. The cable can be better used, the problems that the safety and fireproof effects are reduced, fire disasters are likely to happen, personal safety is harmed and a general structure is relatively single due to the fact that the cable is relatively poor in flexibility and relatively short in service life after being frequently moved back and forth for use are solved, and the anti-interference and moisture-proof capabilities are improved.

The invention discloses an FCS and FH-OFDM combined high-speed anti-interference communication method and system. The method comprises the following steps: S1, acquiring a frequency sensing result of a home terminal; s2, converting the frequency sensing result of the home terminal into a detection message, and transmitting the detection message to a neighbor node; s3, performing fusion analysis on the neighbor nodes to obtain fusion information, and transmitting the fusion information to a home terminal node; s4, forming an available sending frequency set by the home terminal node; s5, acquiring communication information, acquiring decision information, and performing frequency hopping communication according to the decision information and the communication information; and S6, repeating the steps S1 to S5 until the communication is finished. According to the invention, the anti-interference capability is strong, the multipath effect of complex environment transmission can be effectively resisted, and high-reliability transmission performance and higher transmission capacity are provided for the system; frequency sensing is carried out on idle time slots through the FCS, frequency points with serious interference are deducted, the error rate of communication is further reduced, and the anti-interference and data transmission capabilities of a communication system are improved.

The invention discloses a speed and distance measuring method for a triangular linear frequency modulation continuous wave radar, and the method specifically comprises the steps: enabling the radar to periodically transmit equilateral triangular linear frequency modulation continuous wave transmitting signals, and employing a time difference value when the instantaneous frequency of a transmitting signal of a frequency rising segment is equal to the instantaneous frequency of an echo signal of the transmitting signal; calculating the radial speed and distance between the target and the radar according to the instantaneous frequency of the transmitting signal and the instantaneous frequency of the echo signal of the transmitting signal in the frequency drop section and the time difference when the instantaneous frequency of the transmitting signal is equal to the instantaneous frequency of the echo signal of the transmitting signal, and accurately calculating the time difference by adopting a cross-correlation function of the transmitting signal and the echo signal of the transmitting signal; the speed measurement and distance measurement method has the advantages of high speed measurement and distance measurement precision, strong anti-interference and anti-noise capability and low calculation amount.

The present application provides a package and a packaging method thereof, wherein the package includes a substrate, a chip, a sealing layer and a conductive layer; wherein the chip is located on one side of the substrate, the non-functional surface of the chip faces the substrate, the non-functional surface of the chip is provided with a first groove, and the first groove extends from the non-functional surface of the chip to the first grounding pad on the functional surface of the chip; the sealing layer and the chip are arranged on the same side of the substrate, and the sealing layer is arranged around the chip; the conductive layer is located between the substrate and the chip, and partially extends into the first groove to electrically connect the first grounding pad with the second grounding pad on the substrate, and the conductive layer extends from the non-functional surface of the chip to the sealing layer. In the present application, the conductive layer is designed to extend from the non-functional surface of the chip to the sealing layer, so that the orthographic projection of the conductive layer on the substrate is larger than the orthographic projection of the chip on the substrate, so that the package can be applied to high-power devices.

The invention discloses a medical data security transmission method and device, and relates to the technical field of data security. Obtaining text data and image data in the medical data to obtain a text data set and an image data set; extracting sensitive information in the text data set, and embedding the sensitive information into a pixel value of the first target image to obtain a preprocessed image set; mapping a gray value of a second target image in the preprocessed image set to quantum bits to obtain a quantum image set; selecting a quantum image group in the quantum image set, performing pixel value row-column transformation on the quantum image group to obtain a target quantum image group, and performing XOR operation on the target quantum image group to obtain a target encrypted image group; and sending the target encrypted image group and the non-sensitive information as encrypted ciphertexts to a receiving end. The quantum image group is subjected to pixel value row-column transformation, so that the security of the image in the transmission process is ensured, the encryption efficiency is improved, and the anti-interference and anti-attack capabilities are enhanced.

The present invention relates to the field of wireless communication technology for firefighting industry applications, and more specifically, to a competition-based adaptive multi-channel wireless anti-interference communication method and system. The scheme includes starting to monitor the background noise of the radio network to obtain the background noise of the network; judging whether the background noise of the network is greater than the network environment judgment margin, issuing a first command if it is satisfied, and issuing a second command if it is not satisfied, judging whether the delay requirement is met, judging whether the channel change requirement is met, and sending communication data on the current channel; after receiving the fifth command, sending communication data on the new channel, and updating the network channel after receiving the sixth command. The scheme solves the problems of real-time communication and anti-interference of the fire warning alarm network by setting up a multi-channel preemptive communication with a pre-sending listening function, and can effectively avoid the problems of poor communication timeliness and poor anti-interference of the network due to the allocation of fixed channels and communication time slices.

The present invention proposes a fiber optic sensor array with a large dynamic range, wherein the sensing units are more than two and are connected in sequence through transmission optical fibers, and the sensing units include a multiplexing coupler, a sensing / delay fiber loop, and a fiber optic interferometer. The scheme uses a fiber optic interferometer as the basis of a signal sensing unit, and embeds two high-sensitivity and / or low-sensitivity sensing units with positive and negative phases of a certain time delay in the fiber optic transmission multiplexing link, injects light pulses with a certain time interval and repetition rate, and then returns at the Faraday reflector of the fiber optic interferometer to form an interference pulse sensing sequence. The present invention has a variety of combination methods, and can choose to achieve the sensing characteristics of low noise and high saturation threshold of the array, so that the fiber optic sensor array has a large dynamic range of signal acquisition and restoration capabilities, so that it can adapt to the distortion-free acquisition of signals in various existing environments, and is well applied in the fields of sea and land invasion sound monitoring and seabed mineral resource exploration in complex environments.

The invention relates to the field of analysis and detection, in particular to a CoNi layered double hydroxide and metal organic framework compound composite material and a preparation method and application thereof. The composite material provided by the invention comprises a CoNi layered double hydroxide outer layer and a Co-organic framework compound nanocube wrapped in the CoNi layered double hydroxide outer layer. When the prepared composite material is added into a buffer solution containing hydrogen peroxide and luminol, high chemiluminescence intensity is shown, the composite material can be used for chemiluminescence detection, the detection sensitivity is high, the reproducibility is good, the anti-interference capability is high, and a stable and accurate detection result can be provided.

The present invention discloses a terahertz radar system based on chaotic signals, comprising: a signal transmission link and a signal receiving link, wherein the signal transmission link is used to generate and transmit a terahertz chaotic signal to a target object, and the signal receiving link is used to process and obtain perception information based on the reflected signal of the terahertz chaotic signal acting on the target object. The radar system provided by the present invention uses a flexible optical architecture to generate a terahertz chaotic signal as a radar detection signal, which can improve the radar detection accuracy and clarity, and at the same time improve the safety and anti-interference of the radar system.