61 results about "Software-defined radio" patented technology

The invention discloses an unmanned aerial vehicle flight control method for preventing wireless interference, and belongs to the technical field of multi-unmanned aerial vehicle control. The method comprises the following steps: acquiring and preprocessing an SDR signal; performing interference identification on the preprocessed signal and evaluating an interference identification result; a control strategy optimization framework is constructed based on reinforcement learning, and dynamic updating and optimization of flight control parameters are realized; through a multi-mode communication link and a data temporary storage mechanism, real-time monitoring of a task state in an extreme interference scene is ensured. According to the invention, by constructing a multi-sensor fusion autonomous navigation system, high-precision autonomous positioning and dynamic trajectory correction capability are realized; by introducing an intelligent spectrum decision-making mechanism combining software defined radio SDR and machine learning and utilizing fast Fourier transform FFT and reinforcement learning algorithms, full-band interference identification and adaptive frequency hopping communication capabilities are realized.

The invention discloses an intelligent signal scheduling and management system for a satellite transmission uplink station, particularly relates to the technical field of satellite communication, and innovatively adopts a three-layer architecture of intelligent decision-agile execution-closed loop optimization: a reinforcement learning decision engine based on multi-source data fusion dynamically generates a spectrum-power-modulation joint strategy; millisecond-level reconstruction of carrier parameters is realized through a software-defined radio interface; and disaster recovery switching is triggered by relying on service SLA grading. The problems of resource scheduling rigidness, interference response delay and extensive fault recovery of a traditional uplink station are solved, and the core effects of dynamic optimal distribution of transmission resources, adaptive interference rejection in a complex electromagnetic environment and zero-interruption guarantee of high-value services are achieved.

Systems and methods for direct-to-RF (radio frequency) software-defined radio implementation of an active load-pull system are provided. A system may include a controller, a primary field-programmable gate array (FPGA) to control and collect waveform data from vector signal analyzers (VSAs), each comprising an analog-to-digital converter (ADC) connected to an ADC signal-conditioning circuit to directly capture RF measurements of an input signal at an RF fundamental frequency of test and harmonics, each ADC signal-conditioning circuit altering a signal amplitude and isolating a wanted RF frequency of measurement at either the RF fundamental frequency of test or a harmonic to be received by its ADC, first and second couplers generating each input signal by extracting forward and reverse traveling waves at RF from input and output ports of a device under test (DUT), the VSAs capturing the input signals directly at the RF fundamental frequency of test or a harmonic.

The invention provides a prospecting system and method based on software defined radio, and belongs to the technical field of mineral detection, and the system comprises a software defined radio transmitting device which is used for generating transmitting parameters based on the geological structure and detection requirements of a to-be-detected area, an electromagnetic wave emission signal emitted to the to-be-detected area is generated based on the emission parameter; the software-defined radio receiving equipment is used for receiving electromagnetic wave receiving signals propagated in the to-be-detected area; and the mineral analysis module is used for determining a distortion mode based on the electromagnetic wave transmitting signal and the electromagnetic wave receiving signal, and determining the type and grade of minerals based on the distortion mode. According to the invention, the high flexibility of the software defined radio technology is utilized, rapid adjustment of emission parameters is realized to adapt to different geological structures and detection requirements, and the prospecting efficiency of the system is improved. Meanwhile, mineral detection is achieved based on the distortion mode, manual work is not needed, and the mineral detection accuracy is improved.

The invention belongs to the field of wireless communication security, and discloses an electromagnetic signal confrontation sample generation method based on signal-flow mapping and dynamic disturbance modeling. The method comprises the following steps: firstly, acquiring an original signal by using software-defined radio, dividing a time period by a sliding window, and training a classifier by using TimesNet; extracting time domain and frequency domain characteristics of each fragment, mapping the time domain and frequency domain characteristics into a network flow structure, and selecting core characteristics to set a disturbance target; generating a smooth disturbance curve by adopting a damping second-order kinetic model, adjusting disturbance intensity and speed through parameters, and mapping back to a signal domain to obtain an adversarial sample conforming to physical constraints; and if the classifier fails to be attacked, iteratively optimizing the parameters until success. Experiments show that in wireless identification systems for electric vehicle keys, automobile unlocking and the like, the accuracy rate can be reduced from 95% to 15%, meanwhile, disturbance energy is low, signal forms are kept consistent, and the system has double values of actual combat and testing.

The invention discloses a phase-free antenna measurement method, a phase-free antenna measurement system and a storage medium. The phase-free antenna measurement method comprises the following steps: constructing a measurement system comprising an antenna to be measured, a measurement probe, a fixed auxiliary reference antenna and software defined radio; the probe is controlled to move and sample on the scanning plane, and the SDR synchronously collects receiving signals of the probe and the reference antenna; based on the frequency domain transformation result of the two paths of signals, the radiation field amplitude of each sampling point and the relative phase relative to the reference antenna are directly calculated through non-iterative operation, so that complete complex electric field distribution on the scanning plane is reconstructed; and finally, obtaining a far-field directional diagram through near-field-far-field transformation. The fixed reference antenna is introduced to serve as a phase reference, synchronous acquisition and direct calculation are achieved in combination with the SDR, the antenna radiation field can be rapidly and accurately recovered without direct phase measurement or complex iteration in the single scanning plane and single scanning process, and the method has the advantages of being simple in system, high in measurement efficiency and high in signal drift resistance.

The invention discloses a data processing method and device for image transmission of an unmanned aerial vehicle. The method comprises the steps that in the FPV unmanned aerial vehicle image transmission process, to-be-processed signal detection data are acquired, and the to-be-processed signal detection data are data used for representing detection of unmanned aerial vehicle simulation image transmission signals; performing signal screening processing based on time-frequency conversion on the to-be-processed signal detection data to obtain unmanned aerial vehicle image transmission signal data; and performing signal processing based on video signal recovery on the unmanned aerial vehicle image transmission signal data to obtain image transmission video data. The FPV unmanned aerial vehicle simulation image transmission is digitally analyzed through the software defined radio method, the problem that in the prior art, it is difficult for a special IC chip to support multiple frequency bands and multiple systems in the digital analysis process is solved, and digital analysis of image transmission of multiple types of unmanned aerial vehicles is achieved.

Techniques for processing of satellite sensor data by a mobile ground station are described. A satellite transmission from a tasked satellite is received by a mobile ground station, the satellite transmission including unprocessed downlink data. A software-defined radio (SDR) definition associated with a tasked satellite is selected from a plurality of SDR definitions stored by the mobile ground station. A sensor data processing (SDP) application associated with the tasked satellite is selected from a plurality of SDP applications stored by the mobile ground station. An SDR application is executed to extract the collected sensor data from the unprocessed downlink data, the SDR application is loaded with the selected SDR definition. The selected SDP application is executed to generate a product from the collected sensor data. The product is caused to be displayed on a display device.

The invention relates to the technical field of electronic countermeasures, in particular to an unmanned aerial vehicle group dynamic interception method and system based on distributed interference array collaboration. According to the method, an interference node cluster with autonomous logic association is dynamically deployed in a defense domain, and an elastically reconfigurable distributed interference field domain is formed through a software defined radio architecture; time-varying spectrum features are extracted through an adversarial neural network, and a dynamic threat fingerprint database is constructed; generating an interference vector with frequency band following and power self-adaption based on the dynamic threat fingerprint database, and updating the feature weight of the dynamic threat fingerprint database in real time according to interference efficiency feedback; and according to the situation evolution trend of the dynamic threat fingerprint database, a hierarchical interference wave sequence is generated based on a multi-agent consensus protocol, and a space-time coupled interception chain is formed. Through the method, the whole-process dynamic confrontation capability of the unmanned aerial vehicle group is realized, the efficient interception performance is maintained in a complex electromagnetic environment, and meanwhile, the interference risk on legal communication is reduced.

Methods and systems are described herein for adaptive beamforming and interference mitigation using a time synchronized distributed sensor array system ("distributed system"). The distributed system may be a software-defined radio using multi-input-multi-output antenna elements. The distributed system includes multiple sensor nodes which are time synchronized using status information from a sensor node (e.g., timestamp of an occurrence of an event such as receipt of a request for local timestamp, a receipt of a calibration signal). The synchronized distributed system enables the generation of an adaptive beam profile that directs highdirectionality beams toward desired targets while directing spatial nulls toward interference sources. Further, the distributed system makes use of a scalable nonuniform multidimensional array to provide telecommunication and electromagnetic wave manipulation operations for applications of varying scale.

A radio access network (RAN) system comprises a plurality of capsules that operate in parallel to cooperatively perform RAN stack operations, each capsule utilizing a processor and a memory configured to perform a corresponding component of the RAN stack operations, wherein the plurality of capsules are configured to support slicing functionality to separately process different types of signals; wherein the different types of signals correspond to different data flows, wherein each data flow of the different data flows serves as a pipe to transfer user data from one or more applications in accordance with a corresponding quality of service requirement and wherein the RAN stack operations result in: communicating backhaul communications with a core communication network; communicating fronthaul communications with a plurality of radio units configured to engage in wireless communications with a plurality of user equipment (UEs) via a radio channel of a radio network; converting, in accordance with a communication standard, received fronthaul communications from the plurality of radio units into backhaul communications transmitted to the core communications network; and converting, in accordance with the communication standard, received backhaul communications from the core communications network into fronthaul communications transmitted to the plurality of radio units.

A radio access network (RAN) system comprises a plurality of capsules that operate in parallel to cooperatively perform RAN stack operations corresponding to a plurality of RAN stacks, each capsule utilizing a processor and a memory configured to perform a corresponding component of the RAN stack operations, wherein the RAN stack operations result in: communicating backhaul communications with a core communications network; communicating fronthaul communications with a plurality of radio units configured to engage in wireless communications with a plurality of user equipment (UEs) via a radio channel of a radio network; converting, in accordance with a communication standard, received fronthaul communications from the plurality of radio units into backhaul communications transmitted to the core communications network; and converting, in accordance with the communication standard, received backhaul communications from the core communications network into fronthaul communications.

A RAN system includes Capsules that operate in parallel to cooperatively perform RAN stack operations, each capsule utilizing a processor and a memory configured to perform a component of the RAN stack operations, wherein a first subset of plurality of capsules is implemented by a first module under control of a first liquidity controller, wherein a second subset of capsules is implemented by a second module under control of a second liquidity controller, and wherein the first subset of capsules are mutually exclusive of the second subset of capsules. The RAN system migrates, via the first liquidity controller and the second liquidity controller, a first capsule from the first subset of capsules to the second subset of capsules as part of a security mechanism in response to a security attack on the RAN.

Techniques for sharing resources between a radio access technology (RAT) modem (e.g., an LTE modem) and a processor-based radio (e.g., a software-defined radio) are described. In an example, operation of the RAT modem establishes an extended discontinuous reception mode (eDRX) cycle with a cellular system. The RAT modem sends eDRX scheduling information, that is based at least in part on the eDRX cycle, to the processor-based radio. Operation of the processor-based radio identifies paging opportunities (POs) of the eDRX cycle, based at least in part on the eDRX scheduling information. Operation of the processor-based radio manages usage of shared resources (e.g., transmit and receive amplifiers, digital signal processing elements, memory devices, elements of physical layer(s), and / or antenna(s), etc.). The managing may be based at least in part on the identified POs. The managing avoids conflicts between the RAT modem and the processor-based radio over the shared resources.

The invention provides an instrument landing waveform design method and system based on an operator component. The method comprises the following steps: S1, carrying out operator splitting on an ILS waveform function; each operator undertakes a single signal processing function, has an independent input / output interface and configurable parameters, and forms a minimum functional unit. And S2, realizing the function of the operator component. For the function of each operator, an input / output interface and a parameter type are designed according to a core signal processing algorithm of an operator assembly. And S3, carrying out universal packaging on the operator assembly. By defining a unified interface standard and establishing an operator registration mechanism, general data stream adaptation and scheduling during operation are realized, and standardized packaging of operator components is completed. And S4, assembling the operator assembly. And assembling the packaged operators according to an ILS signal processing flow to generate a complete ILS waveform signal chain. The waveform component can be rapidly transplanted and deployed in different software defined radio systems, the development and verification period is short, the transportability is high, and the reusability is high.

The present invention relates to the field of wireless communication technology and discloses a rapid networking method for integrating multiple communication devices based on software-defined radio. The method implements information exchange and data transmission between cross-platform and cross-protocol communication devices through four steps: preliminary networking, integrated strategy decision-making and broadcasting, response and integration of direct neighbor devices, and integration of indirect neighbor devices with other devices. A layer-by-layer diffusion integration mechanism is adopted to ensure the orderliness and efficiency of the networking process. This method does not require manual configuration of network parameters, reduces the complexity and cost of networking, and improves the efficiency and flexibility of networking. It is particularly suitable for scenarios requiring fast and flexible networking, such as emergency communications, the Internet of Things, and military communications.

A programmable digitally-controlled oscillator (DCO) for time-domain symbol generation is described in an embodiment. The programmable DCO comprising: an odd number (n) of multi delay cells (MDGs) to form a ring oscillator, the odd number (n) being equal to or more than three, and the odd number (n) of MDCs being adapted to generate n-1 number of multiplexed phases for phase shift keying (PSK) modulation, wherein each of the n number of MDCs comprises: two or more multi jitter cells (MJCs), each of the two or more MJCs being adapted to activate a corresponding delay for tuning a period of one cycle to represent a corresponding bit of a frequency shift keying (FSK) modulation, wherein each of the two of more MJCs comprises: two or more replica basic delay cells (BDCs) configured to adjust jitter, wherein each of the two or more replica BDC is adapted to provide a predetermined jitter target and comprises: two or more sets of reconfigurable inverter gates having different channel lengths and corresponding frequency ranges, the two or more reconfigurable inverter gates being selectable based on a target frequency range. A backscattered software-defined radio (SDR) transmitter system is also described in an embodiment.

A method may use hybrid-TDMA / FDMA frames to synchronize participating nodes to an orchestrator node of a virtual antenna array as the virtual antenna array transmits to a target node. The virtual antenna array is formed by the orchestrator node and the participating nodes. The orchestrator node synchronizes the participating nodes periodically using the hybrid-TDMA / FDMA frames. The virtual antenna array directs joint communications toward and receives communication from the target node. The communication from the target node may be used to learn channel state information (CSI) between the virtual antenna array and the target node. The nodes may include software-defined radios which execute the hybrid-TDMA / FDMA frames. The hybrid-TDMA / FDMA frames may include concurrent transmissions of signal data and metadata. The hybrid-TDMA / FDMA frames may decouple the duty-cycle from the number of nodes.

This application proposes a method and system for transmitting time synchronization signals based on general-purpose software-defined radio (SDR). The method includes: constructing a time synchronization signal data frame based on input time information; performing direct sequence spread spectrum (DSSS) on the time synchronization signal data frame to obtain a spread digital sequence; modulating and mapping the spread digital sequence into a digital baseband IQ signal; transmitting the digital baseband IQ signal to a general-purpose software-defined radio peripheral; processing the signal through the peripheral; transmitting it via an antenna; and performing time delay calibration on the system before transmission to compensate for internal system delays. This application, by employing a software-defined radio architecture combined with a high-precision clock reference, achieves software-based, general-purpose, and high-precision processing throughout the entire process of time synchronization signal generation, processing, transmission, and calibration. The overall approach offers multiple advantages, including high flexibility, high precision, high reliability, low cost, easy scalability, and open research potential.

A radio access network (RAN) system comprises a plurality of capsules that operate in parallel to cooperatively perform RAN stack operations corresponding to a plurality of RAN stacks, each capsule utilizing a processor and a memory configured to perform a corresponding component of the RAN stack operations, wherein the RAN stack operations result in: communicating backhaul communications with a core communications network; communicating fronthaul communications with a plurality of radio units configured to engage in wireless communications with a plurality of user equipment (UEs) via a radio channel of a radio network; converting, in accordance with a communication standard, received fronthaul communications from the plurality of radio units into backhaul communications transmitted to the core communications network; and converting, in accordance with the communication standard, received backhaul communications from the core communications network into fronthaul communications.

Techniques for sharing resources between a radio access technology (RAT) modem (e.g., an LTE modem) and a processor-based radio (e.g., a software-defined radio) are described. In an example, operation of the RAT modem establishes an extended discontinuous reception mode (eDRX) cycle with a cellular system. The RAT modem sends eDRX scheduling information, that is based at least in part on the eDRX cycle, to the processor-based radio. Operation of the processor-based radio identifies paging opportunities (POs) of the eDRX cycle, based at least in part on the eDRX scheduling information. Operation of the processor-based radio manages usage of shared resources (e.g., transmit and receive amplifiers, digital signal processing elements, memory devices, elements of physical layer(s), and / or antenna(s), etc.). The managing may be based at least in part on the identified POs. The managing avoids conflicts between the RAT modem and the processor-based radio over the shared resources.

Methods and systems are described herein for adaptive beamforming and ultra-low frequency GPR surveying using a time synchronized distributed sensor array system ("distributed system"). The distributed system may be a software-defined radio using multi-input- multi-output antenna elements. The distributed system includes multiple sensor nodes which are time synchronized using status information from a sensor node (e.g., timestamp of an occurrence of an event such as receipt of a request for local timestamp, a receipt of a calibration signal). The synchronized distributed system enables the generation of an adaptive beam profile that directs high-directionality beams toward desired targets (e.g., geological features, resource deposits, drill bits, etc.) while cohering the low-frequency signal to generate viable range resolutions and SNR at depths greater than 5000 meters. Further, the distributed system makes use of a scalable multistatic array to provide telecommunication and electromagnetic wave manipulation operations for applications of varying scale.

This disclosure describes the operating concept and medium access control protocols of a wireless communication system that uses Code Division Multiple Access with Interference Avoidance (CDMA-IA) as its physical layer. The system can dynamically share a common band with other networks without a central radio resource controller. In one embodiment, the wireless communication system includes several radio nodes forming a wireless mesh network, where pairs of radio nodes use individually optimized time-division duplexing. At least one radio node includes a software-defined radio, memory, and an electronic processor. The electronic processor is configured to control the software-defined radio to transmit a pilot signal and share various status information with the other nodes in the network.The shared information includes local spectrum usage and node connectivity sets. The dominant sharing of spectrum usage among all nodes allows for maximizing the use of the shared band.

The present application relates to the technical field of electronic countermeasure, in particular to a method and system for dynamic interception of UAV group based on distributed jamming array cooperation. The method deploys a cluster of jamming nodes with autonomous logical association in the defense domain dynamically, forms a distributed jamming field with elastic reconfiguration through software-defined radio architecture; extracts time-varying spectral features through adversarial neural network, and constructs a dynamic threat fingerprint library; generates a jamming vector with frequency band following and power self-adaptation based on the dynamic threat fingerprint library, and updates the feature weight of the dynamic threat fingerprint library in real time according to the jamming effectiveness feedback; generates a hierarchical jamming wave sequence based on the multi-agent consensus protocol according to the trend of the situation evolution of the dynamic threat fingerprint library, and forms a time-space coupled interception chain. The present application realizes the whole process dynamic countermeasure capability of UAV group, maintains high efficient interception performance in complex electromagnetic environment, and reduces the interference risk to legal communication.

The invention discloses an artificial rainfall experimental method based on software-defined radio, and the method comprises the steps: building an experimental system based on software-defined radio, and enabling the experimental system to comprise a software-defined radio transmitting module, a receiving module, an artificial rainfall device, an experimental environment control module and a data processing terminal, an artificial rainfall device is used for simulating environments with different rainfall intensities, and the rainfall intensities are monitored in real time; a preset test signal is generated and sent at a software-defined radio transmitting end, and a receiving end collects the signal and extracts channel state information; analyzing characteristic changes of channel state information data under different rainfall intensities, and extracting parameters such as signal amplitude attenuation and phase deviation; a mathematical model between rainfall intensity and signal characteristic changes is established, and the rainfall attenuation law is researched. Accurate analysis of the relation between the channel state information and the rainfall intensity under the artificial rainfall condition is achieved, the experimental environment is controllable, the result repeatability is high, and an important basis is provided for detecting environmental rainfall through wireless microwave signals.

The application belongs to the technical field of navigation positioning, and specifically provides a high-precision positioning signal test system based on a software-defined radio (SDR) platform, which comprises a transmitting module, a receiving module, a demodulation and analysis module and a power module; the transmitting module generates positioning signals and transmits them into space; the receiving module receives the positioning signals and performs digital processing; the demodulation and analysis module demodulates and analyzes the digital signals after digital processing, extracts positioning messages, and evaluates signal coverage performance and positioning accuracy; and the power module supplies power to each module; as described above, the application can realize the modulation and demodulation of Beidou signal systems and the processing of navigation signals on the SDR platform, receive and process positioning signals in the 4800MHz-4900MHz frequency band, extract navigation positioning messages, and evaluate signal coverage performance and positioning accuracy.

The invention belongs to the technical field of wireless communication, and particularly relates to a multi-order configurable modulation and demodulation method, device and system for private network cellular networking, and the method comprises the following steps: a network control center dynamically configures a modulation and demodulation parameter set, the parameter set comprises a carrier frequency, a symbol rate, a modulation order, a coding scheme and a radio frequency parameter, the modulation and demodulation parameter configuration process meets the following conditions: the time delay of single mode switching is less than or equal to 10ms; parallel differentiation processing of at least four kinds of heterogeneous service flows is supported; the terminal equipment obtains a current modulation and demodulation configuration strategy through the private network signaling channel; according to the service type and the channel quality index, dynamically switching a working mode in a preset N-order modulation and demodulation mode; a software defined radio architecture is adopted to realize real-time reconfiguration of modulation and demodulation parameters. The problem of contradiction among service diversity, channel time-varying characteristics and resource limitation in a private network environment is solved, and millisecond-level dynamic reconstruction of modulation and demodulation parameters is realized.

The invention provides a high-reliability semi-backscatter communication method and system, and relates to the technical field of communication, and the method comprises the steps: carrying out the coding, modulation and data packaging of original data through a scattering node transmitting end, and obtaining a data frame; and receiving a data frame through a software-defined radio receiving end, and sequentially carrying out frame synchronization, demodulation and decoding on the data frame to obtain decoded data. The LoRa physical layer coding and decoding design is improved, LDPC coding is carried out on original data through a coding module, a quasi-cyclic LDPC code replaces a Hamming code to serve as an error correction code of the LoRa physical layer, a low-complexity check matrix is constructed by constructing a shift basis matrix, a coding codeword is constructed through the check matrix, and the coding efficiency of the LoRa physical layer is improved. And finally, cascading CSS modulation and coding codons by using a bit interleaving technology to construct a data frame so as to increase diversity gain of a signal, and meanwhile, due to the quasi-cyclic characteristic of coding, the LDPC code can obtain extremely strong burst error detection capability during short code input.