179 results about "Channelized" patented technology

The invention relates to the technical field of communication technologies and navigation systems, and discloses a multi-channel narrowband data link comprehensive processing module, which comprises a radio frequency transceiver module which comprises a radio frequency transceiver and is used for converting a received radio frequency signal into a baseband signal and converting the baseband signal into a radio frequency signal; the analog channelization module is connected with the radio frequency receiving and transmitting module and used for receiving the baseband signals converted by the radio frequency receiving and transmitting module, carrying out preliminary channel division on the signals and dividing the signals into a plurality of frequency band signals; and the digital channelization processing module is connected with the analog channelization module and is used for carrying out digital processing on the signal after analog channelization. By adopting a zero intermediate frequency architecture, a multi-stage channelization design, cooperative work of the FPGA and the SOC, precise clock synchronization and an anti-interference technology, the multi-channel signal processing precision and the system stability are improved, and meanwhile, the power consumption and the hardware complexity are reduced.

Implementations of a method of detecting a plurality of radio pulses may include, using at least one signal processor: pre-processing a wideband intermediate frequency signal to form a channelized segment from a software defined radio; performing coherent single-pulse correlation using a spectrogram of the channelized segment; and performing multi-pulse combining with the spectrogram, and determining whether a pulse train including a plurality of radio pulses from a desired pulsed radio signal may be present in the spectrogram.

The invention belongs to the technical field of electronic search, and relates to a radio reconnaissance method and system based on multichannel parallel processing and intelligent clustering, and the method comprises the steps: carrying out the multi-phase filtering digital channelization processing of a broadband radio signal, so as to obtain adjacent channel sequences with overlapped frequency bands; performing square law detection and constant false alarm detection on each channel sequence to generate an initial pulse description word; establishing a candidate corresponding relationship in adjacent channels based on arrival time similarity and noise consistency, and determining a cross-channel merging relationship according to frequency range continuity and frequency-time relationship slope consistency to generate a complete pulse description word; performing hierarchical clustering sorting based on the arrival angle and the pulse width; and performing multi-stage differential analysis on a clustering result to extract a repetition frequency sequence and determine a repetition frequency type. According to the technical scheme, the stability and consistency of cross-channel pulse merging and sorting results can be kept under the broadband high-density condition, and the radio search processing precision under the complex electromagnetic environment is improved.

The invention aims to provide a large-bandwidth signal classification method based on multi-dimensional variable matrix operation, which can solve the problem of limited identification and classification efficiency of accurately and quickly detecting and identifying various target signals in a large bandwidth under the traditional large-bandwidth spectrum monitoring. The method has the following characteristics that the narrow-band channelization function efficiency of a large-bandwidth signal is improved through channelization segmentation efficient matrix structure operation and a hierarchical filtering mode; by constructing a variable-length feature matrix template and adopting a halving and fine search strategy, the efficiency of parallel realization of feature sequence template matching of thousands of narrow-band signals is improved; according to different practical application scenes, the dimension of the feature matrix can be dynamically adjusted to realize the dynamic expansion of the matching length and the type of the template, and the requirements of different processing durations and bandwidths of data are met. The method is high in flexibility, low in complexity, high in target signal recognition and classification performance and particularly suitable for a high-speed parallel signal recognition and classification system.

The invention provides an interval adaptive signal detection method and system based on a digital channelized receiver, and belongs to the field of signal detection in passive radars. The problems that in the passive radar signal receiving process of an existing digital channelized receiver, aliasing of signals and broadband noise exists, and power gains of different frequency bands are unequal, so that channelized signals cannot be normally detected are solved. The amplitude and phase information of M paths of signals are obtained by designing a filter bank, performing multiple serial-parallel conversion processing on input data and performing IFFT operation and CORDIC operation on data output by filtering K paths, then m-point self-correlation accumulation is performed on the amplitude of the M paths of signals, and the amplitude and phase information of the M paths of signals is obtained. Meanwhile, a more flexible threshold calculation method is provided, the working and signal detection bandwidth of the channelized receiver is refined, and a new scheme is provided for improving the signal detection adaptivity of the digital channelized receiver. The method is suitable for signal detection in a scene with non-uniform interference and gain distribution in the working bandwidth of the receiver.

According to the self-adaptive adjustment signal receiving system and method, interference signals are autonomously identified through background signal acquisition and processing, and then parameters such as receiving frequency, bandwidth and gain of a broadband frequency conversion module are adaptively optimized and adjusted to improve the capability of resisting intentional or unintentional interference, so that the bandwidth for receiving and processing the signals can be effectively expanded, and the signal quality is improved. A broadband input signal adaptive adjustment function required by a flexible load communication satellite system is realized, and channelization processing, demodulation, data merging, modulation, digital-to-analog conversion and other functions can be carried out on each signal processing channel. And meanwhile, actions such as analog-to-digital conversion of intermediate-frequency signals, spectrum processing, interference identification, frequency band comparison, adjustment of receiving parameter instruction generation and the like are realized according to the conversion of the working modes.

The invention relates to the technical field of signal processing, and discloses a multichannel signal acquisition and calculation method, device and equipment. The method is applied to a multichannel signal acquisition and calculation device, the device comprises an acquisition card, a CPU and a GPU, the method is executed by the GPU, and the method comprises the following steps: firstly, receiving a satellite baseband signal sent by the CPU; the satellite baseband signal is acquired by the acquisition card and is sent to the CPU; then, the satellite baseband signal is segmented to each sub-channel; and finally, through each thread block in the GPU, based on the non-uniform digital channelization parameter corresponding to each sub-channel, performing non-uniform digital channelization processing on the satellite baseband signal in each sub-channel to obtain a satellite narrowband signal corresponding to each sub-channel. And the satellite narrowband signal is sent to the CPU for realizing satellite positioning. According to the scheme, the occupied space is saved, the signal transmission rate is improved, and the signal processing efficiency and real-time performance are improved.

The invention belongs to the technical field of digital communication, and particularly relates to a multi-phase filtering channelized ultra-wideband signal detection and fusion method and system.The multi-phase filtering channelized ultra-wideband signal detection and fusion method comprises the steps that channelization is conducted, specifically, a receiving bandwidth is evenly divided into K sub-channels, 50% overlapping is adopted between every two adjacent sub-channels, the method comprises the following steps: designing an appropriate prototype filter according to frequency response, determining a multiphase filter coefficient according to the number of sub-channels and the prototype filter, carrying out D-time extraction at the front end of the multiphase filter, enabling the extracted signal to enter the multiphase filter for filtering, and then carrying out fast Fourier inverse transform on K points output each time to obtain output signals of K sub-channels, time domain amplitude detection: acquiring arrival time and pulse width information of the signal in a time domain; according to the method, the problems of missing detection and feature detection errors of multiple time domain overlapped signals in a single channel are solved, and accurate broadband signal parameters are obtained by using the corresponding relationship between the signal frequency domain and the channel passband.

The invention discloses a multi-channel integrated radio frequency system based on double-threshold interference detection and dynamic spectrum aggregation. A radio frequency front-end unit is used for realizing broadband spectrum access and performing analog-to-digital conversion; the digital channel processing unit is used for realizing channelized segmentation through up-conversion and down-conversion, carrying out band elimination filtering to shield unavailable channels and outputting filtering parameters to support dynamic channel recombination; the digital signal parallel processing unit performs parallel access by using the divided channels; the spectrum sensing unit is used for carrying out double-threshold channel interference detection and real-time spectrum analysis according to the parallel access signals; and the frequency spectrum decision-making unit is used for judging the channel state and fusion detection judgment according to the interference detection result, judging the availability of a specific channel in the data link network and carrying out cooperative dynamic frequency spectrum aggregation. According to the method, a consistent spectrum access decision is realized by adopting a spectrum monitoring, sensing convergence and fusion decision mechanism, and consistent understanding of an available frequency set and high-reliability network domain dynamic spectrum aggregation are guaranteed.

The invention belongs to the technical field of radars, and discloses a radar networking anti-interference method based on a digital array radar software definition multifunctional digital radio frequency technology. Various working modes of conventional radar narrowband and broadband detection, multi-station cooperative detection and anti-interference, external radiation source cooperative detection, single-station / double-station MIMO detection, channelized external electromagnetic environment cognitive reconnaissance, cooperative interference, detection and drying integration, multi-platform communication and the like can be realized at the same time. High-isolation signal frequency diversity is realized by using a wide-narrow band signal receiving and transmitting channelization technology, effective coding isolation diversity is realized by using coding pulses, and multifunctional signal time diversity is realized based on partial function time division multiplexing. According to the method, a set of broadband hardware system with composite functions is reused, electronic functions required by a radar networking system are achieved through different software, the purpose of software definition functions is achieved, and meanwhile the anti-interference capacity of the networking system is enhanced.

The invention relates to the technical field of satellite-borne radio frequency signal processing, and discloses a radio frequency interference joint detection method and system for a satellite-borne radiometer, and the method comprises the steps: receiving horizontal polarization and vertical polarization analog signals through the satellite-borne radiometer, respectively inputting the analog signals into independent ADC channels, converting the analog signals into digital signals, and carrying out the preprocessing of the two digital signals; performing digital channelization processing on the pre-processed signal by adopting a multi-term filter bank which is divided at equal intervals, and dividing the pre-processed signal into a plurality of sub-band signals; for each sub-band signal, first-order to fourth-order central moments of the horizontal polarization signal and the vertical polarization signal are respectively calculated within preset integral time, and then a kurtosis value is calculated through second-order and fourth-order central moments; the detection threshold is set to meet the detection index, the radio frequency interference is detected and identified on each sub-band based on the set detection threshold and the kurtosis value obtained through calculation, the kurtosis detection and the polarization detection are sequentially combined to output a radio frequency interference identification signal, and the detection sensitivity and performance are improved.

Device, systems, and / or techniques for using sub-channel signaling information between an access point and a first station are disclosed. In one aspect, a method performed by a station (STA) includes: receiving, from a neighboring STA in an overlapping basic service set (OBSS), a physical (PHY) layer preamble that includes a signal field indicating a plurality of sub-bands and associated power thresholds for Uplink Orthogonal Frequency-Divisional Multiple Access (UL OFDMA) transmission, that are available for OBSS spatial reuse (SR) by the STA; and sending, to an AP with which the STA is associated, an UL OFDMA transmission using a sub-band of the plurality of sub-bands and an associated power threshold indicated in the signal field. Additional embodiments are disclosed.

The invention discloses a frequency domain spectral line accumulation-based frequency sweeping interference detection method and system, and the method comprises the following steps: obtaining sampling data, carrying out the multi-channel digital channelization of the sampling data, and obtaining a frequency domain signal corresponding to each channel; spectral line accumulation is carried out on the frequency domain signal of each channel, then a noise area and a non-noise area are divided, the position of a bottom noise spectral line is estimated according to the noise area of each channel, and finally a detection threshold is calculated according to the spectral line of the position of the bottom noise spectral line. Taking a frequency range exceeding a detection threshold in the frequency domain signal of each channel as a to-be-detected frequency region; and carrying out sweep frequency interference detection based on the gravity center frequency on the to-be-detected frequency region of each channel, and combining the detection results of the channels to obtain a final sweep frequency interference detection result. According to the method, the calculated amount and complexity of the system can be greatly relieved, and the method has very high practicability in engineering implementation.

The invention relates to the technical field of channelized receiver management, in particular to a dynamic range channelized receiver method and system based on a block floating point and AGC (Automatic Gain Control), in the system, an automatic gain control module is used for detecting the power of an obtained intermediate frequency analog signal, generating an AGC voltage corresponding to the intermediate frequency analog signal and feeding back the AGC voltage to an analog front end; and dynamically updating the gain of the variable gain amplifier in the radio frequency signal preprocessing process. According to the invention, each channel has independent block floating point gain control, and the channels do not interfere with each other, so that parallel signal-to-noise ratio processing is realized; meanwhile, a complete gain control history is constructed by jointly recording the AGC gain and block floating point processing, data support is provided for recovering the original absolute power value of the signal in each channel, and the contradiction between gain control and information reservation is solved to a certain extent.

The invention provides a radar cognitive reconnaissance processing method based on recognition before electromagnetic environment signal detection. The method comprises the following steps: step 1, electromagnetic spectrum panoramic sensing; step 2, clutter noise floor calculation; step 3, identifying communication, radar and interference signals; step 4, generating a signal detection threshold of signal receiving; and step 5, channelized mask generation: under the condition that the channelized receiving and parameter measurement signal capability is limited, the detection, sorting and identification probabilities of a radar signal source are improved by sensing the electromagnetic environment.

The application belongs to the technical field of optical communication and relates to a frequency-shift-free microwave photonic channelized receiving device, which comprises a carrier light frequency comb generating unit, a local light frequency comb generating unit, an electro-optical modulation unit, an optical phase shift unit, a channel selection and spectrum processing unit and a plurality of photoelectric conversion units. The received broadband radio frequency signal is modulated on each comb tooth of the carrier light frequency comb through the electro-optical modulation unit, and the frequency alignment between the optical local oscillator and the required receiving sub-channel can be realized based on the "vernier" effect caused by the different free spectral ranges of the carrier light frequency comb and the local light frequency comb and the inherent frequency alignment of the same pump laser. The mirror image sub-channel suppression is realized based on the opposite optical phase shifts on both sides of the pump light. The application has a simple structure, omits the frequency shift and special modulation structure required for frequency alignment, effectively suppresses the inter-channel crosstalk problem in the channelized receiving process, and can flexibly increase the channelization quantity according to actual needs.

The present invention discloses a digital channelized radio frequency storage system. The digital channelized frequency storage module of the radio frequency storage system can perform frequency domain separation on the input signal before storing it, which not only avoids the problem of traditional methods storing superimposed signals and interfering with the output signal, but also effectively avoids the problem of traditional frequency guidance methods that frequency measurement is easily interfered with when multiple signals arrive at the same time. The introduction of the digital channelized frequency storage module can support the acquisition and storage of multiple simultaneously arriving signals, thereby improving the frequency measurement accuracy, achieving the technical effect of precise frequency guidance, and can be used to counter coherent radar. At the same time, the high-speed, multi-bit A / D converter provided by the present invention, after the operating frequency enters the microwave frequency band, can directly acquire and reconstruct the signal in the intermediate frequency or radio frequency band, and maintain the subtle information characteristics such as the phase of the original signal, thereby ensuring that the output signal has good coherence, and can achieve high radio frequency storage accuracy and long signal storage time.

The application relates to a chip verification method. The method comprises the following steps: acquiring a to-be-tested chip program and signal constraint parameters corresponding to each to-be-tested function module in the to-be-tested chip program; based on a preset signal generation function, extracting the signal constraint parameters corresponding to each to-be-tested function module, generating a value constraint condition, and generating each simulation signal by traversing all the value constraint conditions; in a verification environment, performing channelization processing on each simulation signal by the to-be-tested function module to obtain each processing result; acquiring reference results corresponding to the to-be-tested function module, and determining a verification result of the to-be-tested function module according to each reference result and each processing result. The method can improve the accuracy of the chip verification method.

The application provides a photon-assisted ultra-wideband millimeter wave multi-channel receiver, and the ultra-wideband millimeter wave multi-channel signal is channelized and divided by adopting the radio frequency local oscillator microwave photon frequency conversion, high-frequency stable multi-channel channelization local oscillator generation and multi-channel parallel coherent detection technology; under the constraint of a low-cost analog-digital converter, the function of high-sensitivity parallel narrowband reception of the ultra-wideband millimeter wave signal is realized through parallel channel analog-digital conversion and reception processing, and large capacity and long-distance transmission of millimeter wave wireless communication are supported. The application solves the problems of ultra-wideband signal reception, analog-digital conversion and processing in millimeter wave wireless communication, supports large capacity and long-distance transmission of millimeter wave wireless communication, and can be applied to an ultra-wideband millimeter wave wireless communication system; the principle is simple, the scheme is simple and efficient, and the application value is high.

The invention provides a digital channelization implementation method based on a fractional-multiple oversampling multiphase filter bank, the method works in a parallel pipeline mode, the number of input parallel paths is Ain, the number of output parallel paths is A, the number of channels is M, the length of each phase of sub-filter is L, the length of the total filter is L * M, and M = M1 * A, Aint; a, M1, Ain, A and L are all positive integers. The method comprises the following steps: shaping input Ain-path parallel data into A-path parallel data through a data shaping module; the input data is rearranged according to M phases through an input data rearrangement module, and A * L data are output in parallel under each clock; a sub-filter and a scheduling module of the sub-filter call a filter coefficient according to the parallelism A for filtering; channel frequency shifting is carried out through a parallel hierarchical FFT module; and finally, correcting phase deflection caused by oversampling through a phase rotation module to obtain a channelized result. According to the invention, large-bandwidth and multi-channel real-time digital channelization is realized based on the multi-phase filter bank in limited resources, the channel division is flexible, and the problem of frequency spectrum attenuation of a traditional multi-phase filtering channel is solved.

The present invention discloses an airborne interference method and device for complex radar signals based on time-sharing transmission and reception. The method includes the following steps: a digital module receives radar radio frequency signals and performs down-conversion and channelization processing to obtain detection signals and PDW data; a main control module performs sorting processing on the PDW data to obtain the number of radars and corresponding EDW data; the main control module generates sampling gates, distance gates, window gates, and transceiver gates, etc. The parameters of the window gates include window protection duration, window duration, and window interval duration; the digital module controls the timing of radar radio frequency signal reception and radio frequency interference signal transmission through the transceiver gates. The method of the present invention realizes accurate interference within the entire distance segment, solving the problem that the existing interference logic cannot adapt to complex waveforms.

The invention discloses a service-adaptive satellite-borne non-uniform multicarrier demodulation device, and belongs to the field of digital signal processing. The method comprises the following steps of: firstly, performing orthogonal down-conversion and resampling filtering processing on a digital intermediate frequency signal sampled by an ADC (Analog to Digital Converter), processing the digital intermediate frequency signal by a non-uniform channelization splitter, and then serially outputting the digital intermediate frequency signal to a spread spectrum ratio self-adaptive variable burst capturer according to fixed quadruple sampling to capture a leading head and identify the spread spectrum ratio; the method comprises the following steps: completing symbol synchronization and de-spreading processing on an input signal according to a spread spectrum ratio, then completing carrier coarse synchronization and pattern word identification, completing modulation mode identification and carrier synchronization according to a pattern word, performing channel decoding through a multi-mode decoder to recover to an information bit stream, and outputting the information bit stream. And the information bit stream is sent to a service frame recombination processor for search identification and recombination splicing, and output is carried out after whole-frame CRC check is carried out. The method has the advantages of flexibility in use, low resource occupation and capability of realizing adaptive demodulation of variable-rate, multi-modulation-mode and multi-coding-mode service transmission signals without parameter configuration.

A method for constructing a radar signal intelligent detection model based on Channel‑DeepIQ, a radar signal intelligent detection method, a computer device and a storage medium. The present invention relates to the field of electronic reconnaissance, and specifically to the field of radar signal intelligent detection. In order to solve the problem that the existing signal detection method has unsatisfactory detection effect under low signal-to-noise ratio conditions. The present invention combines digital channelization with neural network technology to improve the detection performance of low signal-to-noise ratio signals while maintaining a certain false alarm probability. After digital channelization improves the signal-to-noise ratio, a classification network is used for the arrival of signals in the sub-channel, that is, a convolution kernel with a structure similar to that of a matching receiver to complete the matching reception classification of the sub-channel; for pulse edge signals, a jump point detection network is used to detect the pulse edge and divide the signal area and the noise area. The present invention provides possibilities for more complex signal detection tasks.

The present disclosure provides a multi-mode satellite mobile communication uplink signal real-time detection and identification method and system. Applied to the field of satellite mobile communication technology, the method comprises: performing wideband sampling on the obtained received signal to obtain sampling data, performing signal carrier detection on the sampling data, judging whether the sampling data contains a target signal, and if so, proceeding to the next step; performing channelization processing on the sampling data to obtain narrowband signals in different satellite system corresponding narrowband channels; performing TDMA signal detection on the narrowband signals to obtain signal specifications, wherein the TDMA signal detection comprises energy detection, correlation detection, and signal identification. The present disclosure has the advantages of: significantly improving the accurate identification capability of various satellite mobile communication terminal uplink signals, with a detection and identification accuracy of 99%; and the hardware cost of the present disclosure increases little, and has a low-cost application prospect.

The invention discloses a simultaneous diversity signal real-time detection method, and belongs to the technical field of radar signal reconnaissance. Comprising the following steps: S1, full-channel signal detection and parameter measurement; s2, performing hierarchical cache management on pulse description words; s3, performing matching detection and fusion processing on the simultaneous diversity signals; s4, data re-caching and detection circulation are carried out; according to the simultaneous diversity signal real-time detection and measurement method provided by the invention, aiming at the technical pain point that a traditional digital channelized radar reconnaissance receiver is difficult to detect the simultaneous diversity signal quickly and effectively in real time, through the core design of hierarchical cache management, fixed reference matching fusion and closed-loop circulation detection, the real-time detection of the simultaneous diversity signal is realized; according to the method, accurate and real-time detection and parameter extraction of simultaneous diversity signals are achieved, meanwhile, excellent engineering realizability and scene adaptability are achieved, breakthrough is achieved from multiple aspects of signal detection performance, processing real-time performance, hardware landing performance, engineering practicability and the like, and the signal processing capacity of a radar reconnaissance system in a complex electromagnetic environment is greatly improved.

Provided are methods, apparatus, and systems for using at least one subchannel of a physical channel for uplink communication, wherein the physical channel may include a set of resources within a first and second channel boundary, whereby the physical channel may include multiple subchannels, each of which may include a subset of physical channel resources and may have at least one subchannel boundary that does not overlap with the first or second channel boundary. A typical apparatus includes a station (STA), the STA including: a processor, and a transmit / receive unit configured to: transmit control information including a subchannel SIG field for indicating a STA identity via an uplink, receive a trigger frame for indicating one or more subchannels that can be obtained from multiple subchannels, determine a subchannel to be obtained from the one or more subchannels, and use the obtained one or more subchannels and transmit data via an uplink.

The invention belongs to the field of wireless communication technology, and in particular to a broadband signal detection method based on scale iteration and spectrum compensation. Aiming at the problems that the existing broadband signal detection algorithm is easily affected by noise, has poor detection effect under low signal-to-noise ratio, has high complexity, takes a long detection time, and requires a large amount of prior information, the following scheme is proposed, comprising the following steps: Step A: A received signal is sampled by AD to obtain a broadband sampling signal, and the broadband signal is divided into multiple signal segments of appropriate bandwidths through digital channelization; the purpose of the invention is to make the noise floor estimation more accurate and avoid false detection caused by uneven noise floor for broadband signals by utilizing the characteristics of morphological filtering bandwidth screening; utilize smoothing iteration to overcome the error caused by strong pulses and white noise in the signal to signal parameter estimation, improve the detection performance of frequency band aliasing signals by spectrum compensation, realize blind detection of broadband signals, and improve detection accuracy.

The present invention discloses a 8192-channel real-time digital channelization method based on FPGA, including sequentially performing first-level channelization, second-level channelization and third-level channelization on input signals. In order to meet the performance requirements of large-bandwidth multi-channel simultaneous reception, the method introduces a 32×32×8 three-level channelization calculation structure, and at the same time, data reorganization is achieved through each ping-pong BRAM module, and a sequential output method is adopted in the output timing, as well as multi-channel time division multiplexing of the FIR filter IP core, so that the requirements of large-bandwidth multi-channel real-time digital channelization are achieved within limited resources, and there is no need to cascade multiple FPGAs for processing, thereby reducing costs, system volume, and power consumption.

A signal acquisition device includes a signal channelizer module and a signal processing module. The signal channelizer module is configured to channelize an incoming signal from a moving platform into a first plurality of channels across a first range of frequencies to produce a first channelized signal, to channelize the first channelized signal into a second plurality of channels across a second range of frequencies to produce a second channelized signal, and to store the second channelized signal into a memory. The signal processing module is configured to retrieve the second channelized signal from the memory and search the second channelized signal for a signal of interest. The search may exclude channels tagged to be excised during the storing operation.

Techniques are provided for steering vector generation. A methodology implementing the techniques according to an embodiment includes converting time domain data received from an antenna array to channelized frequency domain data. The method also includes receiving a request from a signal detection system, the request including a timestamp and duration of a detected signal of interest (SOI) and an indication that the SOI is pulsed or continuous. The method further includes generating, for a pulsed SOI, steering vectors to steer the antenna array to the pulsed SOI based on a segment of the time domain data stored in a first memory and identified by the time stamp and duration; and generating, for a continuous SOI, steering vectors to steer the antenna array to the continuous SOI based on a segment of the channelized frequency domain data stored in a second memory and identified by the time stamp and duration.