181results about How to "Improve interference effect" patented technology

An SAR deception jamming method with jammers and receivers jointly networked includes the following steps that the multiple jammers and the multiple receivers are arranged for networking, radar signals are intercepted through the jammers and the receivers, and SAR signal parameters are analyzed; through the intercepted radar time domain signals, the instant slope distance difference from all the receivers to the jammers is calculated; the instant position distance parameters corresponding to all the receivers are calculated; a coefficient matrix is constructed, and the inverse of the coefficient matrix is calculated; according to the coefficient matrix and the instant position distance parameters, modulation parameters are calculated; the instant slope distance difference of points in jamming scenes relative to the jammers is calculated; jamming modulation is performed on the signals intercepted by the jammers to generate jamming signals; the deception jamming signals are forwarded, and an opposite-side radar obtains deception jamming signals with real-scene radar signals and the false-scene deception jamming signals overlapped. The method avoids influences of approximate errors on SAR deception jamming effect, vivid jamming images can be obtained, good jamming effect is achieved, and the method has the advantages of being simple, efficient and accurate.

The invention relates to a method for suppressing inter-user cochannel interference in the field of communication technology and a base station thereof, the method includes the steps: a user monitors and tests downlink signals of a cell or a sector and a plurality of adjacent cells or sectors; geographical position information of the user in the cell or the sector is judged to obtain the geographical position information of the user in the cell or the sector; base stations of the adjacent cells or the sectors mutually notify base stations of the adjacent cells or the sectors about the condition of resources occupied by boundary users of the cell or the sector; according to a distribution result, communication among the cells or the sectors is carried out on the resources occupied by the boundary users, if the boundary users in the adjacent cells use the same resource, the resource is redistributed; according to the resource distribution result, an uplink of the user is matched by the base station. While achieving the aim that the inter-user cochannel interference is reduced, the invention has the advantages of high spectrum reuse coefficient, increase of output speed of the boundary user, etc.

The invention discloses a multiplexing modem of time orthogonal frequency-division, which relates to a modem device with restricted transmitting power, strong anti-frequency offset capability and the performance of resisting inter-symbol interference in the field of communication. The multiplexing modem of the invention comprises components such as a low-medium frequency modulator, a demodulator, an auxiliary multiplexer/demultiplexer, an intermediate frequency amplifier, a D/A converter, a low pass filter, a self-vibration module, a mixer, an adder, a band-pass filter and a power supply, etc.; by adopting TOFDM signals with quasi-constant envelop transmission, the modem of the invention realizes the performance of resisting the inter-symbol interference which is the same as that of the traditional OFDM technology, has the capability of collecting multipath, overcomes the problems of large peak-to-average power ratio and the bad capability of resisting frequency offset, and also realizes the purpose of the multiplexing modem of the time orthogonal frequency-division. The modem of the invention also has the advantages of high integration degree, small volume, light weight and good flexibility, etc. and is especially suitable for the field requiring for the modem with large-capacity wireless data transmission performance among strong multipath high-speed moving targets with seriously restricted power.

The invention relates to a voice interference method, which comprises the flowing steps: firstly, interfered voice signal acquiring; secondly, voice signal processing; thirdly, interfering signal output. The first step also comprises the steps of interfered voice signal acquiring, converting acquired signals into electrical signals, and converting electrical signals into digital signals; the second step also comprises the steps of obtaining digital signals through the first step, and producing interfering signals; the third step also comprises the steps of converting interfering signals into corresponding electrical signals, further amplifying electrical signals and outputting interfering sound, and mutually superposing interfering sound and interfered voice in space to realize the final interference effect. The method has the advantages that the pertinency of interference is high, the output interfering sound is mild, the noise pollution to the surrounding environment is small, and the normal communication among others is not influenced. The voice interference method can be applied to the voice interference in an enclosed space or the voice signal interference in an open space.

The invention belongs to the technical field of radars and discloses a chaff cloud spurious echo simulation method of a missile-borne radar after a moving object is tracked. The method comprises the following steps: firstly obtaining a synthetic center-of-mass coordinate of a chaff cloud and a target; then obtaining the number of chaffs on each range gate; then obtaining the antenna gain, amplitude and frequency of a single chaff, and obtaining a jamming modulation value of the single chaff; then sequentially adding the jamming modulation values of all the chaffs on the current range gates (one range gate is added every time); obtaining a chaff cloud total modulation sequence on all the range gates; and finally convoluting an emission signal with the total modulation sequence, so that a chaff cloud center-of-mass spurious echo signal is obtained. The method disclosed by the invention has the advantages that difference between the actual tracking point of a missile and a simulation tracking point can be reduced, and accurate simulation on chaff cloud center-of-mass jamming is realized.

The invention is concerned with the combination depositing catcher, includes the catcher main body, the biology web in the catcher main body, the characteristic is: the catcher main body is round tube shape, the ratio of the catcher height and the opening outer diameter of the catcher is 4 to 5, sets the annular protrusion on the inner wall of the round tube, the biology web is on the annular protrusion. The top of the catcher main body is PVC round tube, the bottom is transparenc organic glass round drum depositing collecting equipment, sets internal thread at the bottom of the PVC tube, sets the external thread at the top port of the depositing collecting equipment, the bottom of the PVC tube and the drum depositing collecting equipment is the screw threaded connection, the depositing collecting equipment collocates the cover with internal thread. The catcher is collocated several stainless steel biology webs with different aperture.

The invention discloses an anti-eavesdropping device which comprises a signal input module, a signal processing module, a signal storage module, a human-computer interaction interface module, two or more than two power amplifying driving circuit modules, two or more than two matching circuit modules and two or more than two ultrasonic transducer array modules. An audio frequency fixed point propagation technology is innovatively used to transmit a record interference signal, a conversion signal based on an original voice signal is adopted as an interference signal, the interference is only conducted on the target area requiring anti-eavesdropping recording interference, other areas are not affected, transmission strength of the interference signals is reduced, and a good interference effect is obtained. Effective interference on the anti-eavesdropping recording of a recording device in different application scenes is achieved, and the device has important practical significance and wide use value.

The invention discloses an online monitoring system for hydrogen in power transformer oil based on a thin film technology. The online monitoring system comprises a hydrogen sensitive chip and a control assembly, wherein the hydrogen sensitive chip comprises a hydrogen sensitive element; the hydrogen sensitive element is a hydrogen sensitive sensor based on a Pd-Cr thin film; and the control assembly is used for converting physical property variation of the hydrogen sensitive chip in a measuring range into a signal to be output. The online monitoring system disclosed by the invention has the advantages of simple structure, low cost, high sensitivity, good stability and the like.

The invention provides a determination reagent for eliminating interference of ascorbic acid (vitamin C, VC) by uricase method and an application method thereof. The reagent disclosed herein comprises liquid double reagents, and has good ascorbic acid interference resistance and excellent stability. According to the invention, a two point terminal method is adopted, and the reagent can be applied in semi/full-automatic biochemistry analyzers; the reagent is prepared by using a specific enzyme, thus the reagent has the characteristics of high sensitivity and strong interference resistance; and by adding the selected stabilizing agent, the reagent has good stability, and the reagent can be stored at 2-8 DEG C (in sealed dark place)for 12 months without influence on the performances. The reagent can be widely applied for diagnosis of acute and chronic nephritis, renal calculus, gout and other kidney diseases and leukemia, multiple myeloma and other diseases caused by excessive metabolism of nucleic acid, health check, general examination of kidney diseases and the like.

The invention relates to a multi-sequence frequency hopping anti-interference communication method based on pseudo-random linear frequency modulation, which comprises the following steps: a frequencymodulation slope is replaced with a controllable pseudo-random number in a linear frequency modulation signal; On the basis, the multi-sequence frequency hopping technology is combined with the multi-sequence frequency hopping technology; The carrier frequency of each hop is mixed with one pseudorandom linear frequency modulation signal, it is ensured that the extended bandwidth of the pseudorandom linear frequency modulation signal is smaller than the channel bandwidth, and a communication anti-interference waveform is generated. Based on multi-sequence frequency hopping, the multi-sequence frequency hopping anti-interference communication method based on pseudo-random linear frequency modulation is provided by taking further improvement of the anti-interference capability of multi-sequence frequency hopping communication as a research starting point, and can be applied to practice as an emergency communication means.

The invention relates to an internal thermally coupled rectifying tower control device based on temperature wave characteristics. The device comprises an internal thermally coupled rectifying tower, an intelligent instrument, a control station, a data storage device and an upper computer, wherein the intelligent instrument is connected with the internal thermally coupled rectifying tower; the control station is connected with the internal thermally coupled rectifying tower; the data storage device is connected with the intelligent instrument and the control station; and the upper computer is connected with the data storage device and the control station and comprises a concentration gradient description module, a temperature gradient description module, a static temperature wave description module, a dynamic temperature wave description module, a set value conversion module and a control parameter solution module. According to the device disclosed by the invention, a nonlinear control scheme is established on the basis of a high-precision nonlinear model, and the interference effect can be timely inhibited; the coupling problem is well solved, and the set value change can be rapidly and accurately tracked; and moreover, the temperature with high measurement precision and small measurement time delay is taken as a main control means, and the control speed and control performance are greatly improved.

The invention discloses a communication interference method based on a generative adversarial network. The method comprises the following steps: constructing a GAN network model; collecting a target signal time domain waveform of a target communication system, and making a training set; training the GAN network model by using the training set of the target signal, changing the learning rate, training for multiple times, observing the change trend and the generated waveform of the loss function under different learning rates, and when the network loss function tends to be stable within the settraining times and the generated waveform with the same time domain and frequency domain characteristics as the signal in the training set can be generated, fixing the learning rate; training the network under the determined learning rate to generate an interference waveform with the same time domain and frequency domain characteristics as the signals in the training set; and applying interferenceto the target communication system by using the generated interference waveform. Characteristics of the target signal can be autonomously extracted, the interference waveform is generated to implement interference, and application generalization is achieved while good interference effect is achieved.

The invention provides a method and a system for designing time domain man-made noises in an orthogonal frequency division multiplexing system. The method includes: obtaining subcarrier number N of the system and length NCP of a cyclic prefix, wherein the N and the NCP are natural numbers; generating transmitting information of a transmitting end according to the subcarrier number N and the length NCP of the cyclic prefix; determining noises added in the transmitting information; adding the transmitting information and the noises to generate mixed signals; and performing serial-parallel conversion on the mixed signals, and transmitting the converted signals out.

The invention discloses an anti-interference method. The method includes the following steps that: narrowband interference of instant branch frequency-domain signals and time-delayed branch frequency-domain signals are filtered out; the anti-interference filter weight of the instant branch frequency-domain signals or time-delayed branch frequency-domain signals of which the narrowband interference is filtered out is calculated; and anti-interference filtering processing is performed on the instant branch frequency-domain signals and the time-delayed branch frequency-domain signals of which the narrowband interference is filtered out by using the anti-interference filter weight. The invention also provides an anti-interference system. With the anti-interference method and the system of the invention adopted, the significant digits of anti-interference input signals can be effectively reduced, resources required by back-end processing can be decreased, the degree of freedom of anti-interference can be increased, and an anti-interference ability can be still enabled when the total amount of broadband interference and narrowband interference is greater than the number of array elements.

The invention discloses targeted interference equipment and an interference method of wireless local area network. The interference equipment of the wireless local area network comprises a radio frequency receiving module, a frequency scanning module, a physical layer receiving module, a multi-access computer layer (MAC) analyzing and comparison module, an interference data generating module, a radio frequency transmitting module, a power amplifier and an antenna, wherein on one hand, the radio frequency module is connected with the antenna, and on the other hand, the frequency scanning module and the physical layer receiving module are respectively connected with the radio frequency module, the physical layer receiving module is connected with the MAC layer analyzing and comparison module, and the interference data generating module, the radio frequency transmitting module and the power amplifier are respectively connected with the MAC layer analyzing and comparison module. According to the targeted interference equipment and the interference method of wireless local area network, shield interference can be merely conducted by targeting appointed sites without influencing normal communication of other sites in network, and interference to all sites can be achieved. The targeted interference equipment and the interference method of wireless local area network is good in interference effect, wide in range of action and low in energy consumption.

The invention relates to a ladder type stress ring synthetic diamond mold which is characterized by comprising a pressure cylinder (1), prestressed rings (2) and a protective ring (3), wherein the axial height of each layer of prestressed rings (2) is in a ladder shape, and the upper end surface and the lower end surface of each layer of prestressed rings (2) are inclined planes with lower inside, high outside and an inclination of 2-15 degress; the prestressed rings (2) are installed in the protective ring (3); the pressure cylinder (1), the prestressed rings (2) and the protective ring (3) are tightly sleeved together by utilizing interference fitting; and according to difference of the size of mold internal pressure, a layer amount of the prestressed rings (2) can be 3-6. In the ladder type stress ring synthetic diamond mold, each prestressed ring (2) is in the ladder shape, and the upper and lower end surfaces have a certain inclination, thereby benefiting to forming a multilayer prestressed structure and strengthening the bearing capability of the mold, ensuring good interference effect, prolonging the service life of the mold and enhancing the quality and the production efficiency of a synthetic diamond.

The invention belongs to the technical field of radars, and discloses a corner reflector interference echo simulation method after tracking a moving target by a missile-borne radar. The corner reflector interference echo simulation method comprises the steps of: firstly, calculating a radar scattering cross-sectional area of a corner reflector; secondly, calculating a Doppler frequency of a cornerreflector interference modulation sequence according to a radius and a rotating speed of the rotating corner reflector; thirdly, solving the corner reflector interference modulation sequence according to amplitude and delay of the corner reflector interference modulation sequence; and finally, carrying out convolution on a transmission signal and the modulation sequence to obtain a corner reflector interference echo signal. Therefore, the Doppler frequency brought by the rotation of the corner reflector is obtained, and the passive interferent corner reflector can be detected as a target witha velocity.

The invention discloses a voice signal interference device. The voice signal interference device comprises a voice signal collection and input module, an automatic gain regulation module, an analog filter, an analog-to-digital converter, a digital signal superposition module, a digital signal processing module, a digital-to-analog converter, a power amplifying circuit module, a circuit matching module, an ultrasonic transducer module and a plurality of digital phase shift modules. By means of the voice signal interference device, signals which need to be protected are collected, phase shifting is conducted on the signals to form interference signals, the interference signals are sent in an orientated mode through the ultrasonic transducer array module, the oriented anti-eavesdrop function can be achieved, and the interference signals are simple in generation mode, good in interference effect and easy to obtain.

The invention discloses a method for RNA (ribonucleic acid) interference of panonychus citri mites. The method includes the steps of feeding the panonychus citri mites, treating the panonychus citri mites with dsRNA solution, determining the molting and survival situation of treated the panonychus citri mites, and evaluating the effect of the RNA interference. The method has novel and reasonable design, enables the panonychus citri mites not to complete the normal molting so as to die with RNA interference, and thus, the purpose of preventing the panonychus citri mites is achieved, the amount of the chemical pesticides to be used can be reduced, and accordingly the method has a broad application prospect.

The control method, device and interference system of an interference drone obtain the wireless working signal of the drone received by the detector (S101); determine the signal characteristic of thewireless working signal (S102); control the interference according to the signal characteristic The device generates an interference signal (S103). The control method improves the interference effectof the drone and reduces the electromagnetic influence of the surrounding environment.