48 results about "Multistatic radar" patented technology

A multistatic radar system is provided for detecting and tracking targets moving in a surveillance area that includes: a radar transmitter and a plurality of radar receivers located in different positions in the surveillance area and processing means. The radar transmitter and the radar receivers are configured to obtain a GNSS-based time reference based on the GNSS signals received by the respective GNSS receiver. Each radar receiver is configured to determine, for each radar echo received by the radar receiver from a respective target, a corresponding distance-related information item based on the predefined transmission time and frequency pattern, the GNSS-based time reference and a respective reception time of the radar echo, and to provide the processing means with data indicative of the distance-related information items and the Doppler frequencies determined by the radar receiver, and reference times associated with the distance-related information items and the Doppler frequencies.

The invention provides a three-dimensional positioning method and system for a satellite-borne multi-base radar system based on weighted linear iteration, and the method comprises the steps: obtaining radar echo data of a plurality of receivers, carrying out the effective detection of a target, and carrying out the searching of a pitch angle and a space taper angle of a target signal through a two-dimensional adaptive filtering technology, obtaining two-dimensional angle estimation information of the target at different bases and different visual angles; constructing a nonlinear equation set according to two-dimensional angle information and slope distance information of the target under different visual angles, and performing first-order Taylor expansion on the nonlinear equation set to obtain a corresponding linear overdetermined equation set; and forming a precision matrix according to the known measurement precision of the radar system, and carrying out normalization operation and iterative solution on the linear overdetermined equation to obtain the three-dimensional coordinate of the target in the earth-centered earth-fixed coordinate system, thereby obtaining the latitude, longitude and height information of the target, and realizing the high-precision three-dimensional positioning of the multi-static radar system.

A method for supporting radar operations may involve providing, from a radar server, one or more transmit beam parameters, over one or more wired or wireless interfaces, to a first wireless communications system Transmission Reception Point (TRP) for configuring a transmit beam for sending a transmit signal from the first wireless communications TRP. The method may further involve providing, from the radar server, one or more receive beam parameters, over one or more wired or wireless interfaces, to a second wireless communications system TRP for configuring a receive beam for receiving, at the second wireless communications system TRP, an echo signal from one or more targets as a reflection of the transmit signal. The first wireless communications system TRP and the second wireless communications system TRP may be part of a wireless communications system.

Disclosed herein are systems and methods for a multistatic radar system that is configured to detect airborne objects without the need for a transponder on the aircraft. The multistatic radar can be implemented using preexisting communications infrastructure associated with various networks such as paging networks. The multistatic radar system can be implemented using a plurality of multistatic communications links (e.g., transmitters that are communicatively coupled to a plurality of receivers). The distribution of transmitters and receivers in the network can be based on the RF conditions of the coverage area of the network. The multistatic radar network can produce one or more deterministic waveforms that provide the network with signal diversity needed for accurate detection, localization, and tracking of airborne assets. By controlling the waveforms in the system, as well as the density of the network, the multistatic radar system is able to use narrowband signals and operate with lower power than conventional radar systems.

A wireless communication network performs multi-static radar operations, including operating multiple access points as geographically-diverse radar transmitters that transmit illumination signals, for illumination of a target region, and an example User Equipment (UE) operates as a radar receiver with respect to the multi-static radar transmission. The network may perform multi-static radar operations on demand, for power savings and interference reduction, and UEs may indicate particular radar-sensing needs or capabilities when requesting multi-static radar operation, for consideration by the network when configuring the corresponding illumination-signal transmissions.

The invention belongs to the technical field of radar signal processing and electromagnetic target characteristic analysis, and particularly relates to an extended target scattering modeling method for a broadband multistatic radar system. According to the method, for aircrafts with complex motion characteristics such as unmanned aerial vehicles and missiles, a unified scattering model under various motion types is established, and multi-base geometric modeling, broadband signal expression and coupling modeling of various target motion mechanisms are introduced; accurate simulation and feature extraction of target scattering characteristics under any transmitting-receiving geometric condition are realized, and a basis is provided for subsequent target identification and parameter inversion.

The application discloses a low-resolution radar reflectivity factor refinement method based on a phased array radar, relates to the radio technology field, and comprises the following steps: time alignment is performed on the cleaned phased array radar linear domain reflectivity factor and the cleaned low-resolution radar linear domain reflectivity factor, and simulation is performed based on an interpolation model; space geometry matching is performed on the cleaned phased array radar linear domain reflectivity factor and the cleaned low-resolution radar linear domain reflectivity factor, and simulation is performed on the phased array radar linear domain reflectivity factor dataset based on a multi-base radar detection data conversion model and a coarse beam simulation operator; a residual network model based on a self-attention mechanism is trained and iteratively optimized to obtain an optimized model, the cleaned low-resolution radar linear domain reflectivity factor data are input into the optimized model, and low-resolution radar spatial refined reflectivity factor data are output. The application can improve the authenticity, physical consistency and business availability of the refined reconstruction result.

The invention discloses a multi-static radar system deployment method considering position uncertainty, and relates to the technical field of radar systems. The method comprises the following steps: dividing a monitoring area into distinguishing units; establishing a candidate deployment model of radar nodes on the motion platform; constructing a position deviation area with the ideal position as the center; performing spatial averaging on the signal-to-noise ratio based on the region to obtain an average signal-to-noise ratio of each resolution unit; determining the lowest average signal-to-noise ratio and the effective coverage rate; and solving an optimal deployment scheme by adopting a multi-target optimization algorithm by taking the two as a joint optimization target. According to the invention, the coverage capability and the performance stability of the radar system under node position disturbance can be effectively improved.

The present invention relates to a multi-base radar anti-suppression interference method based on a spatial power characteristic domain, and belongs to the field of radar signal processing technology. First, radar intermediate frequency echo data is collected and cached, and then the echo data is pulse compressed and the spatial energy coefficients of all distance segments of each coherent pulse are calculated; then the signal-to-noise ratio function of the spatial characteristic domain is constructed; then, according to the threshold of the spatial power characteristic domain, it is judged whether it is an interference signal or a target echo signal. If it is an interference signal, the range gate is marked by parameter estimation and fed back to the signal processing to effectively suppress the interference signal and effectively improve the target detection probability. The present invention relates to solving the problem of multi-base radar joint anti-suppression interference under complex electronic interference, which can effectively suppress interference signals, improve the probability of target detection, and enhance situational awareness capabilities.

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for multistatic radar communications. In some implementations, a transmitting device may transmit, to a receiving device, a radar alert frame followed by a codeword and one or more radar pulses. The radar pulses are transmitted, using beamforming, in a number of directions. The timing information indicates a timing offset or delay between one or more codewords of the codeword sequence and the beginning of the radar pulses. The receiving device may detect one or more codewords of the codeword sequence and an echo of at least one of the radar pulses, and determine the time at which the corresponding pulse was transmitted by the transmitting device. The receiving device may compare the timing of the echo with the timing of the transmitted pulse to determine a relative distance of an object that produced the echo.

The present disclosure provides systems, methods, and apparatus for multistatic radar communications, including computer programs encoded on computer storage media. In some implementations, a transmitting device may transmit a radar warning frame, followed by a codeword and one or more radar pulses, to a receiving device. These radar pulses are transmitted in several directions using beamforming. Timing information indicates a timing offset or delay between one or more codewords in a codeword sequence and the start of the radar pulse. The receiving device may detect an echo of one or more codewords in the codeword sequence and at least one of the radar pulses and determine the time when the corresponding pulse was transmitted by the transmitting device. The receiving device may compare the timing of the echo with the timing of the transmitted pulse to determine the relative distance of the object that generated the echo.

The invention provides a dual-multistatic radar system based on an all-optical architecture, which comprises a transmitting station and a receiving station, adopts the all-optical architecture, fully adopts microwave photon technical achievements, and comprises an optical frequency source, optical up / down conversion filtering, an optical phase shift network, optical beam forming, optical channelization and an optical ADC (Analog to Digital Converter). The characteristics of wide working band, low phase noise dispersion, low delay loss and the like of microwave photons are fully utilized; the system adopts a dual multi-base mechanism, supports receiving and transmitting separation and multi-view target observation, and has the system advantages of extremely strong anti-stealth, low interception, anti-interference and the like; the system adopts a wireless synchronization technology based on 1PPS signals to solve the problems of synchronization and signal coherence of the double-base radar and the multi-base radar, the practical scene of the system is effectively widened, and the layout difficulty of the system is reduced.

This invention discloses a target localization method for multiple-transmitter, multiple-receiver passive multistatic radar under interference conditions. The method includes: acquiring reference channel signals and echo signals and performing signal characterization preprocessing to obtain reference channel signal matrices and echo signal matrices; estimating channel parameters based on the reference channel signal matrices and echo signal matrices using the generalized likelihood ratio principle to construct a DPI-GRLT detector; solving the DPI-GRLT detector and calculating the detection statistics at each grid point to obtain the radar target information estimation result. This invention can maintain high localization accuracy and achieve rapid estimation and resolution of multiple targets even under weak signal conditions. As a target localization method for multiple-transmitter, multiple-receiver passive multistatic radar under interference conditions, this invention can be widely applied in the field of radar target localization technology.

An entanglement-assisted multistatic quantum radar detection technique employs the integrated entangled source shared among multiple transmitters and performing transmit side optical phase conjugation. EA receivers are based on classical homodyne detection schemes. The EA multistatic radar detection technique is evaluated against bistatic radar EA detection scheme and various coherent states-based quantum detection schemes (the optimum quantum detector. Helstrom threshold detector, and random phase optimum quantum detector). The EA multistatic target detection probability is significantly better than that of corresponding bistatic radar EA detection techniques. coherent states-based quantum detection techniques. and the classical radar detection schemes. When both scattered signal photon channels and idler channels are noisy and lossy, the scheme significantly outperforms the EA bistatic radar scheme.

From a first perspective, a radio device (R1) is provided, configured for wireless communication and for bistatic or multistatic radar detection, comprising a transceiver, a memory, and a processor coupled to the transceiver and memory. The transceiver and processor are designed to receive a baseband receive signal from a second radio device (R2) via the transceiver. This receive signal includes a coded message and a plurality of reference signals after transmission over a wireless channel (102). The transceiver and processor are designed to calculate channel state information using the plurality of reference signals contained in the baseband receive signal.The transceiver and processor are designed to calculate an estimate of a transmitted signal originally sent by the second radio device using the channel state information and the received signal. The transceiver and processor are designed to perform at least demodulation and channel decoding on the estimated transmitted signal to obtain an estimate of the message transmitted by the second radio device. The transceiver and processor are designed to generate a reconstruction of the transmitted signal by performing baseband signal processing and reference signal insertion on the estimated message, where the baseband signal processing and reference signal insertion correspond to the baseband signal processing and reference signal insertion performed by the second radio device.The transmitter-receiver and the processor are designed to generate sensor channel data by combining the reconstruction of the transmitted signal and the received signal.

The invention discloses a multi-input multi-output passive multistatic radar target positioning method based on an interference environment, and the method comprises the steps: collecting a reference channel signal and an echo signal, and carrying out the signal representation preprocessing, and obtaining a reference channel signal matrix and an echo signal matrix; channel parameter estimation is carried out based on the reference channel signal matrix and the echo signal matrix in combination with a generalized likelihood ratio principle, and a DPI-GRLT detector is constructed; and solving the DPI-GRLT detector, and calculating detection statistics under each grid point to obtain a radar target information estimation result. According to the method, high positioning precision can still be kept under the condition of weak signals, and rapid estimation and resolution of multiple targets can be achieved. The multi-input multi-output passive multistatic radar target positioning method based on the interference environment can be widely applied to the technical field of radar target positioning.

The invention provides a construction method of a dual / multistatic radar anti-interference digital simulation platform for offshore / port intelligent comprehensive monitoring scenes. Aiming at the difficulties that functions, interfaces and data streams are complex and the like, the general architecture is decoupled by adopting a resource layer, a function layer and a user layer according to the principles of upgradeability, expandability and easiness in maintenance, networking radar scene simulation configuration, radar configuration design, target and interference echo generation, radar detection imaging and efficiency analysis modules are developed, and an all-digital simulation platform is established. Based on a platform design scenario experiment, aiming at large and medium-sized ship targets from the dimensions of a technical system and a geometric configuration, under the environments of illegal electronic equipment interference, multi-radar mutual interference, ship metal component interference and combined interference, different ship target types, offshore / port scene parameters, interference types and radar configurations are flexibly configured, so that the ship targets can be quickly and accurately positioned. And the module adaptability, expansibility and stability of the platform and the reasonability of core verification architecture design are verified.

The invention discloses a multi-static radar distance deception jamming recognition and high-speed target detection method, which is applied to the field of radar anti-jamming and aims at solving the problem of failure of real target detection caused by strong deception of distance deception jamming during high-speed target detection. The method comprises the following steps: firstly, establishing an echo model under an interference condition according to a multistatic radar distance historical mathematical equation, and on this basis, realizing coherent accumulation of a single-channel echo signal through Radon Fourier Transform (RFT); then, acquiring matching position information of each target in different channels by using an entropy cyclic matching method based on a topological structure; secondly, performing ellipse positioning processing on the paired position information to realize identification of distance deception interference and a target; and finally, performing constant false alarm rate detection processing on the identification result of the target and the distance deception interference to obtain a target detection result.

The invention discloses a multi-static radar physical target and active false target identification method, and belongs to the field of target identification and interference resistance. The method comprises the following steps: estimating deception parameters of a target in a plurality of coherent processing intervals on the basis of measurement information based on a multi-static radar, so as to combine and form a deception parameter vector; according to the characteristic that physical target deception parameters approximately obey zero mean Gaussian distribution, variance is calculated, and a reference vector is constructed; mapping the deception parameter vector and the reference vector to a matrix manifold or a power spectrum manifold; adopting total Bregman divergence and three types of geometric metrics thereof to define a geometric distance; calculating a geometric distance between the target mapping point and the reference point; and comparing the result with a threshold value to realize the discrimination of the physical target and the false target. According to the method, the separability of physical target and false target distribution is enhanced by utilizing information geometric measurement, and the discrimination performance is remarkably improved; the method can achieve excellent performance under the condition of a small number of samples, adapts to real-time countermeasure requirements, and is high in target recognition robustness and controllable in complexity.

Existing multistatic configurations of Radar systems requires a direct LoS signal and / or time synchronization among the Radar transmitter and the multistatic distributed Radar receivers. The present disclosure provides a phaseless frequency-modulated continuous-wave multistatic Radar (PFMR) imaging that relaxes requirement of the direct LoS signal and only requires a plurality of parameters of a FMCW signal comprising a chirp signal rate, a carrier frequency and, a period of chirp to be known. Further, it also removes condition of the time synchronization among a plurality of FMCW multistatic distributed Radar receivers. However, because of absence of the time synchronization among a plurality of FMCW multistatic distributed Radar receivers, an unknown random phase offset appears after deramping. The present disclosure eliminates the unknown random phase offset, by performing autocorrelation function on a mixed signal, resulting in a phaseless measurement data corresponding to a plurality of FMCW Radar imaging signals.

The present disclosure generally relates to a multistatic radar system and a method for a spatially resolved detection of an object under test. The multistatic radar system includes an at least two-dimensional multistatic array of antenna elements having an at least partially shared coverage area. At least one data processing circuit is coupled to the array. Analog and / or digital beamforming is performed thereby obtaining at least one image of the object under test at least partially being located within the shared coverage area. Processing the image obtained is used to resolve at least one scattering center of the object under test. A spatially resolved scattering center distribution is determined based on the image obtained.

This disclosure provides systems, methods, and apparatus, including computer programs encoded on a computer storage medium, for multi-static radar communication. In some implementations, a transmitting device may transmit a radar alert frame to a receiving device followed by a codeword and one or more radar pulses. The radar pulses are transmitted in several directions using beamforming. The timing information indicates a timing offset or delay between one or more codewords in the sequence of codewords and the start of the radar pulse. The receiving device may detect one or more codewords in the sequence of codewords and an echo of at least one of the radar pulses and determine a time at which the corresponding pulse is transmitted by the transmitting device. The receiving device may compare the timing of the echo to the timing of the transmitted pulse to determine the relative distance of the object producing the echo.

This invention relates to a method for secure synchronization and authentication of radar data frames for a bistatic or multistatic radar system, comprising the steps of: generating an unpredictable authentication sequence or a key for calculating the unpredictable authentication sequence; synchronizing at least one subsequence of the authentication sequence or the key between components of the radar system via a secure communication channel, wherein, in the case of key synchronization: generating a subsequence of the unpredictable authentication sequence using the key; embedding the subsequence of the authentication sequence into the radar data frame; transmitting the radar data frame through a transmitter of the radar system; receiving the radar data frame through at least one receiver of the radar system; and matching the subsequence of the received radar data frame with the subsequence of the transmitted radar data frame for authentication of the received radar data frame. The invention further includes a radar system capable of implementing the method.

A node in a wireless communication system coordinates multistatic radar measurements, wherein the node controls a plurality of wireless communication devices. Coordination involves obtaining an indication that a first sensing area located within a geographic area that is served by the node is to be sensed by a first radar signal. A first multistatic radar group of wireless communication devices selected from a participating group of the plurality of wireless communication devices and the node is formed, wherein the first multistatic radar group comprises at least one device for transmitting the first radar signal and at least two devices for receiving one or more reflections of the transmitted first radar signal. The first multistatic radar group is controlled to introduce the first radar signal into the first sensing area and to receive the one or more reflections of the introduced first radar signal. The sensed reflections obtained by wireless communication devices in the first multistatic radar group are caused to be combined to obtain geographical information about the first sensing area. Other aspects involve a wireless communication device interacting with a network node to receive allocated time and radio frequency resources to be used for a radar function.

According to a first aspect, there is provided a radio device (R1) configured for wireless communication and bistatic or multistatic radar sensing, comprising a transceiver, a memory, and a processor coupled to the transceiver and the memory. The transceiver and the processor are configured to, after transmission over the wireless channel (102), obtain, via the transceiver, a baseband receive signal comprising an encoded message and a plurality of reference signals from a second radio device (R2). The transceiver and the processor are configured to calculate channel state information using a plurality of reference signals included in the baseband receive signal. The transceiver and the processor are configured to calculate an estimate of a transmitted signal originally transmitted by the second radio device using the channel state information and the received signal. The transceiver and the processor are configured to perform at least demodulation and channel decoding on the estimate of the transmitted signal, thereby obtaining an estimate of the message transmitted by the second radio device. The transceiver and the processor are configured to generate a reconstruction of the transmitted signal by performing baseband signal processing and reference signal insertion on the estimated message, wherein the baseband signal processing and reference signal insertion correspond to the baseband signal processing and reference signal insertion performed by the second radio device. The transceiver and the processor are configured to generate sensed channel data by combining the reconstructed and received signals of the transmitted signal.

This invention discloses a method for accumulating and detecting high-speed maneuvering targets under range-velocity joint deception jamming, applied to the field of radar anti-jamming. It addresses the problem that existing technologies struggle to accurately identify range-velocity joint deception jamming and effectively detect high-speed maneuvering targets in multi-static radar systems under low signal-to-noise ratio conditions. First, this invention constructs an echo model of a high-speed maneuvering target under range-velocity joint deception jamming. Then, it proposes a method based on topological Euclidean distance to achieve multi-channel coherent accumulation and acquire target position estimation information for each channel. Finally, it uses hyperbolic-elliptic joint positioning to process the position estimation information, rapidly obtaining the physical target's position estimate and accurately identifying range-velocity joint decoy targets.

A method, network node and wireless device (WD) for synchronous reference path selection for bistatic and multistatic radar operations in a cellular network are disclosed. According to one aspect, a method in a WD or radio base station comprises selecting, via a first reconfigurable repeater, a first synchronization reference path for synchronization between a first network node and a second network node, the first synchronization reference path being resolvable from a second synchronization path comprising a second reconfigurable repeater, the first synchronization reference path is selected to be parsable from the object. The method further comprises using the second synchronization reference path for synchronization between the first network node and the second network node via the second reconfigurable reference path in the event of interference or congestion in the first synchronization reference path.

The application provides a kind of based on weighted linear iteration's spaceborne multi-base radar system three-dimensional positioning method and system, comprising: obtaining the radar echo data of multiple receivers and effectively detecting target, search the elevation angle and spatial cone angle of target signal by two-dimensional adaptive filtering technology, obtain the two-dimensional angle estimation information of target under different base different visual angle;According to the two-dimensional angle information and slant range information of target under different visual angle, construct nonlinear equation group, and carry out first-order Taylor expansion to it, obtain corresponding linear overdetermined equation group;According to the measurement accuracy known to radar system, form accuracy matrix to the linear overdetermined equation and carry out normalization operation and iterative calculation, and calculate the three-dimensional coordinates of target in the earth-centered earth-fixed coordinate system, and then obtain the longitude and latitude and height information of target, realize the high-precision three-dimensional positioning of multi-base radar system.

The application discloses an anti-deception jamming method based on networked radars, which comprises the following steps: configuring networked radar systems as virtual isomorphic networking radar mode, virtual multi-base radar mode and virtual active / passive radar mode respectively; obtaining the anti-deception jamming success rate of the virtual isomorphic networking radar mode; obtaining the anti-deception jamming success rate of the virtual multi-base radar mode; obtaining the anti-deception jamming success rate of the virtual active / passive radar mode; selecting the mode corresponding to the maximum value among the anti-deception jamming success rates of the virtual isomorphic networking radar mode, the virtual multi-base radar mode and the virtual active / passive radar mode as the final mode. In the process of establishing the multi-station radar, the application can ensure that radars with multiple functions and systems are deployed at the same time, overcome the shortcomings of the existing single multi-station radar system, and meet different anti-jamming performance requirements.

The invention provides a low-orbit multi-static radar satellite constellation coverage calculation method and system. The low-orbit multi-static radar satellite constellation coverage calculation method comprises the following steps: S1, calculating orbit data of all satellites under a J2000 coordinate system by adopting a J2 recursion model; s2, calculating a position vector of a target under the J2000 coordinate system; s3, for each moment, calculating and determining a satellite set sigma 1 meeting the ground elevation angle constraint; s4, calculating and determining a satellite set sigma 2 meeting the distance constraint; s5, calculating and determining a satellite set sigma3 meeting the single-satellite view field constraint; s6, solving a union set Sigma 4 of Sigma 1, Sigma 2 and Sigma 3, combining every two satellites in the Sigma 4, calculating a bistatic angle of each combination to the target, and determining a target coverage state flag FL at the moment; and S7, according to a certain time resolution, repeatedly solving the target coverage state flag FL at each moment, and calculating and determining the maximum revisit time, the average revisit time and the minimum revisit time. According to the method, the ground coverage of the low-orbit multi-static radar constellation can be quickly calculated.