12results about How to "Improve signal processing capabilities" patented technology

The invention relates to the technical field of meteorological monitoring and lightning protection, and discloses a radio signal-based lightning protection detection method for a meteorological station, which comprises the following steps of: receiving electromagnetic wave signals generated by lightning discharge in real time through radio receiving equipment of a plurality of meteorological stations, and acquiring characteristic data of time, frequency and intensity of the signals; an effective light velocity model is adopted to correct the influence of the propagation velocity of the lightning signal in the atmosphere, and the effective propagation velocity of the lightning signal is calculated by considering the ionospheric and atmospheric refraction effects; the position of the lightning power supply is estimated by measuring the arrival time difference and the time difference of lightning signals received by different sites and utilizing the geometric positions of the multiple sites. The positioning precision of the lightning power supply is greatly improved by adopting the cooperative work of the radio receiving equipment of a plurality of meteorological stations and combining the technologies of accurate lightning signal propagation speed correction, time synchronization error correction, geometric precision optimization and the like.

The utility model discloses a nerve detection junction box which comprises a box body, a user interface module is fixedly arranged on the surface of the box body, a signal processing module and a data storage module are fixedly arranged inside the box body, and a multi-channel detection module is electrically connected outside the box body. The multi-channel detection module comprises a biological electrode array with the channel number expanded, each channel of the biological electrode array is sequentially and electrically connected with an operational amplifier and a filter, the output end of the filter is connected with the input end of the signal processing module, the output end of the signal processing module is connected with the input end of the data storage module, and the output end of the data storage module is connected with the output end of the data storage module. Compared with the prior art, the multi-channel neural signal acquisition device has the advantages that by introducing the multi-channel detection module, the number of channels of the device is increased, neural signals of a plurality of channels can be acquired at the same time, the comprehensiveness and accuracy of signal acquisition are improved, and the accuracy of signal acquisition is improved. And the research and clinical diagnosis requirements on the complex neural network are met.

The invention discloses a method for identifying the motion state of an artificial limb wearer. The method comprises the following steps: 1, acquiring a signal; 2, preprocessing the initial signal based on wavelet transform; 3, extracting characteristic values of the signals based on wavelet packets; and 4, classifying and identifying the motion state based on a K-nearest neighbor algorithm. According to the invention, automatic identification of the motion state of the artificial limb wearer is realized, and the identification rate and real-time performance of motion state identification of the artificial limb wearer are effectively improved.

The invention relates to a filter, in particular to an MZI and MRR combined on-chip hybrid filter and a control method thereof, and aims to overcome the defect that in the prior art, the function of a single tunable filter is relatively limited. The MZI and MRR combined on-chip hybrid filter comprises an MZI structure and MRR filtering modules located on an MZI upper arm and an MZI lower arm respectively; the MRR filtering module comprises a third beam splitter, a fourth beam splitter, a fifth beam splitter and a sixth beam splitter. Phase shifters are arranged between the third beam splitter and the fourth beam splitter, between the fourth beam splitter and the fifth beam splitter, between the third beam splitter and the fifth beam splitter, and between the fourth beam splitter and the sixth beam splitter. Meanwhile, the invention provides a control method of the MZI and MRR combined on-chip hybrid filter, so that the MZI and MRR combined on-chip hybrid filter simultaneously outputs a group of optical signals with complementary frequency spectrums and a group of optical signals with the same frequency spectrums.

The invention provides a radiation source positioning method and device, electronic equipment and a storage medium, radio frequency signals are simultaneously transmitted to a main satellite and an adjacent satellite module through radiation source equipment, and the radio frequency signals are respectively processed and then transmitted to a receiving station module. And the receiving station uses an adjacent satellite interference suppression algorithm to accurately distinguish and weaken interference signals from adjacent satellites, so that the recognition rate and the purity of target signals are remarkably improved. On the basis, a passive positioning algorithm is combined, and the position of the radiation source can be accurately calculated only according to the received first channelized signal and the signal subjected to interference suppression processing. The signal processing capability in a complex electromagnetic environment is enhanced, and accurate positioning of the radiation source can be stably realized even under a strong interference condition.

The invention provides a frequency-adaptive dual-frequency low-orbit navigation enhanced signal receiving system, and relates to the technical field of signal processing. The device specifically comprises an antenna module, a signal amplification module, a shunt module, a frequency mixing module, a self-adaptive intermediate frequency filtering module, a gain amplification module, an anti-aliasing filtering module, a combining module and an analog-to-digital conversion module. And the adaptive intermediate frequency filtering module is used for determining a corresponding target filter according to the input intermediate frequency signal, filtering the intermediate frequency signal by using the target filter and inputting the intermediate frequency signal into the gain amplification module. According to the invention, the adaptive intermediate-frequency filtering module selects the corresponding target filter according to the frequency of the intermediate-frequency signal, thereby achieving the flexible filtering of the signal, effectively avoiding the frequency offset phenomenon of the radio-frequency signal received by the receiver, guaranteeing the compatibility of the receiver to a large extent, improving the signal processing performance of two or more frequency bands, and improving the signal processing efficiency. And the navigation efficiency is improved.

The utility model provides a kind of system level package chip of vehicle-mounted GNSS receiver, receiver and car, chip includes outer circle contact, inner circle contact and chip body;First, eleventh, twenty-third, twenty-fifth, twenty-seventh, thirtieth, thirty-second contact in outer circle contact, and fifth, eighteenth to twenty-fourth, twenty-eighth contact in inner circle contact, are all ground terminal;Fifth contact in outer circle contact and twenty-ninth contact in inner circle contact, are all first power supply terminal;Sixth contact and seventh contact are connected in outer circle contact, and seventh contact is second power supply terminal;Thirty-sixth contact and thirty-fifth contact are connected in outer circle contact, and thirty-fifth contact is third power supply terminal;Twenty-sixth, twenty-eighth, twenty-ninth and thirty-first contact in outer circle contact are four radio frequency input ports respectively;Fortieth contact in outer circle contact and first contact in inner circle contact are respectively communication interface for wired communication.

The invention discloses a passive frequency conversion structure and method for generating two paths of time-varying signals based on a transistor. The passive frequency conversion structure comprises an input impedance matching network, a time-varying tuning circuit, a source resonance circuit, a drain resonance circuit, a source output impedance matching network and a drain output impedance matching network. The input impedance matching network performs impedance conversion on a microwave input signal; the time-varying tuning circuit modulates an input signal into two paths of time-varying tuning signals; the source resonance circuit and the drain resonance circuit can respectively screen the tuning signals to obtain resonant frequency signals; source and drain output impedance matching networks enable the resonant frequency signal to be output at maximum efficiency. By utilizing the characteristic that the capacitance values of the junction capacitance between the gate and the drain and the junction capacitance between the gate and the source of the transistor change along with the change of the voltage loaded at the two ends of the transistor, two paths of time-varying reactance circuits are formed in combination with external inductors, two paths of passive frequency conversion signals are creatively generated based on one transistor, and the application prospect is wide.

This invention provides a BTM enhanced antenna unit, including a first filtering circuit, a power supply and triggering circuit, a logic control unit, and a signal acquisition and decision circuit. The first filtering circuit is disposed between the power transmission loop of the antenna and the BTM, and is used to reduce harmonic radiation of the power transmission loop. One end of the power supply and triggering circuit is connected to the power receiving loop, and the other end is connected to the logic control unit, used to regulate the electrical signal on the BTM cable and output a trigger signal to the logic control unit. The signal acquisition and decision circuit is used to acquire the A4 interface signal, make a decision on the A4 interface signal, and output the decision result to the logic control unit. The logic control unit is used to control the acquisition and transmission of the A4 interface signal according to the trigger signal and the decision result. The BTM antenna unit of this invention has an energy judgment function, which improves the reliability of the BTM antenna, reduces the harmonic radiation of the BTM signal, and improves the compatibility between the antenna unit and the BTM.

The miniature programmable logic expander designed by the invention comprises a main control chip U3, the main control chip U3 is connected with an external programming channel and power supply voltage through a multi-channel digital input protection network, is connected with signal output through a multi-channel transistor switching circuit, and is also connected with a reference voltage unit and serial port input. The output comprises a relay signal. The invention successfully provides a logic control device which is flexible, high in cost performance, strong in expansion capability and multifunctional. The system effectively solves the problems of resource waste, insufficient flexibility and the like of a traditional PLC or a control card in small application and expansion scenes, and perfectly meets the diversified requirements of industrial automation and an intelligent control system in various environments, especially the special requirements in the aspects of input control and output control.

The invention discloses a full-field-angle multi-user optical wireless communication system and method based on an optical antenna. The system comprises a base station and a user side. The user side comprises user transceivers located at different positions; the base station can perform data exchange with a plurality of user sides at the same time; the base station comprises a base station signal sending module, an omnidirectional LD transmitter module, an omnidirectional field angle optical antenna module, a base station receiver and a base station signal processing module. According to the invention, 360-degree full-field-angle coverage can be realized, and meanwhile, a multi-user wireless optical signal transmission capability and an area orientation estimation function are realized.

The invention relates to the technical field of signal processing, in particular to a method for detecting an R peak in an ECG signal under a high-intensity motion condition, which comprises the following steps of: simulating a plurality of noise types, and randomly adding the noise types into a motion ECG signal to obtain an ECG signal containing a plurality of noises; fourier transform and wavelet transform are carried out on the ECG signals containing the noise to obtain time-frequency representation of the signals, and a training set is constructed based on the time-frequency representation of the signals; constructing an R peak detection model based on the BILSTM network and the CNN network, and training the R peak detection model by using the training set; carrying out R peak detection on a to-be-detected ECG signal based on the trained R peak detection model; and the detected R peak is corrected through self-adaptive post-processing. According to the invention, the accuracy of R peak position detection is improved.