Nonlinear radar

The state of the art in nonlinear radar is conveyed by presenting high-level system architecture, explaining the rationale behind design decisions pertaining to that architecture, and listing the ...

The target tracking of nonlinear maneuvering radar in dense clutter environments is still an important but difficult problem to be solved effectively. Traditional solutions often rely on motion models and prior distributions. This paper presents a novel improved architecture of Kalman filter based on a recursive neural network, which combines the sequence learning of recurrent neural networks ... for the nonlinear radar range equation [41–49]. The radar range equation for a harmonic radar (fr = nft, where n is an integer) has been derived and it shows that, whereas the received signal is inversely proportional to the fourth power of the range for a conventional radar (i.e., R 4 dependence), the range law becomes increasingly unfavorableMoreover Radar ambiguity function (RAF) is also analysed and used for studying various performance parameters of both NLFM and LFM waveforms. Key Words: Linear frequency modulated waveform, non-linear frequency modulated waveform, radar ambiguity function. 1. INTRODUCTION In the radar literature, LFM is known to be easilyAbstract and Figures. This paper presents an extensive review of nonlinear response-based radar systems. Nonlinear radars are generally used for clutter suppression purposes. These radars detect ...Non-linear or 'harmonic' radars were first introduced in the 1970s; since then, the range of applications for this technology has grown [9]. Harmonic radars have been …Be prepared with the most accurate 10-day forecast for Blagoevgrad, Blagoevgrad, Bulgaria with highs, lows, chance of precipitation from The Weather Channel and Weather.comAbstract: This paper presents an extensive review of nonlinear response-based radar systems. Non-linear radars are generally used for clutter suppression purposes. These …

Aiming at high-resolution radar target recognition, new convolutional neural networks, namely, Inception-based VGG (IVGG) networks, are proposed to classify and recognize different targets in high range resolution profile (HRRP) and synthetic aperture radar (SAR) signals. The IVGG networks have been improved in two aspects. One is to adjust the connection mode of the full …Remote Sens. 2021, 13, 4982 2 of 22 The paper is divided into six sections. A brief comparison between the nonlinear radar and conventional radar path loss model and sensitivity issues are ... Rain? Ice? Snow? Track storms, and stay in-the-know and prepared for what's coming. Easy to use weather radar at your fingertips!Convolutive Complex-Valued Independent Component Analysis for Nonlinear Radar Signal Processing and Maritime Weak Target Detection November 2021 Mathematical Problems in Engineering 2021(2):1-17Nonlinear radar has proven to be a viable means of detecting devices that contain electrical nonlinearities. Electrical nonlinearities are present in dissimilar metals, metal to oxide junctions, semiconductors and more. This paper presents a linear and nonlinear synthetic aperture radar (SAR) system capable of imaging linear and nonlinear targets. This article develops the applicability of non-linear processing techniques such as Compressed Sensing (CS), Principal Component Analysis (PCA), Iterative Adaptive Approach (IAA), and Multiple-input-multiple-output (MIMO) for the purpose of enhanced UAV detections using portable radar systems. The combined scheme has many advantages and the potential for better detection and classification ...

Aug 15, 2022 · A simultaneous-frequency nonlinear radar is presented for detecting radio frequency electronic targets of interest. The radar transmits 20 frequencies (“tones”) between 890 and 966 MHz, at ... In a nonlinear radar, fundamental tone(sF are sent out into the environment, and the natural clutter reflects the fundamental tone(sF. fn contrast, the tag that contains a nonlinear device backscatters the fundamental response and also the nonlinear response back towards the target. Figure 1 shows the nonlinear responses generated when aswitching between two radar modes, additional information about the threat is received, and, thus, the probability that it is detected is improved. 1.1 Linear Radar Versus Nonlinear Radar Linear radar is well suited to the detection of a target whose complex permittivity ˆ contrasts greatly with that of its surroundings: Frequency-modulated continuous wave (FMCW) radars are an important class of radar systems, and they are quite popular because of their simpler architecture and lower cost. A fundamental problem in FMCW radars is the nonlinearity of the voltage-controlled oscillator (VCO), which results in a range of measurement errors, problems in …A radar assembly for receiving signals at spaced frequencies from an unknown transmitting source comprising a receiver operative to receive signals; the receiver comprising a series of channels, each channel comprising a low pass filter configured to allow passage of a signal from an unknown transmitting source, an analog to digital converter configured to …

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The only way to obtain a kind of useful response in order to detect the PCL presence is to use a harmonic (nonlinear) radar approach [13,14,15]. Theoretically, it may be possible to obtain the harmonic response of an LNA by transmitting the sounding signal of a given frequency f 0 and measuring the response signal at 2f 0 or 3f 0 frequencies.Nonlinear radars can be utilized to detect electronic devices, which are difficult to detect with conventional radars due to their small radar cross sections (RCS).Nonlinear radars operate by illuminating an electronic target, which has a nonlinear frequency response (e.g. a diode tag or RF electronics), with two or more tones at closely spaced frequencies.Ultra-wideband (UWB) nonlinear frequency modulation (NLFM) waveforms have the advantages of low sidelobes and high resolution. By extending the frequency domain wideband synthesis method to the NLFM waveform, the synthetic bandwidth will be limited, and the grating lobe will grow as the number of subpulses increases at a fixed synthetic bandwidth. Aiming for the highly periodic grating lobes ...

We dub this the nonlinear topological magnon spin Hall effect. Our findings are deeply rooted in the bosonic nature of magnons that the particle number is not …Explore the latest full-text research PDFs, articles, conference papers, preprints and more on HARMONICS. Find methods information, sources, references or conduct a literature review on HARMONICSApr 17, 2021 · Automatic modulation recognition plays a vital role in electronic warfare. Modern electronic intelligence and electronic support measures systems are able to automatically distinguish the modulation type of an intercepted radar signal by means of real-time intra-pulse analysis. This extra information can facilitate deinterleaving process as well as be utilized in early warning systems or give ... Nonlinear radars can be utilized to detect electronic devices, which are difficult to detect with conventional radars due to their small radar cross sections (RCS).A simultaneous-frequency nonlinear radar is presented for detecting radio frequency electronic targets of interest. The radar transmits 20 frequencies (“tones”) between 890 and 966 MHz, at ...May 1, 2022 · The second approach involves a combination of linear and nonlinear radar imaging mechanisms such as real aperture radar (RAR), including tilt and hydrodynamic modulations (predominately in scanning or range direction), and specific SAR imaging process. Jan 1, 2010 ... By exploiting the known dependence of the characteristic spectral form of the clutter Doppler spectrum on radar frequency and other parameters, ...Vladimir Polacek's 5 research works with 15 citations and 129 reads, including: Design considerations and performance of monopulse direction finder antennas“Refs. [44,45] shows the implementation of a harmonic radar in the marine environment. The radar was implemented in stepped frequency continuous wave mode with an output power of ≈50 dBm in the S-/C-band.A simultaneous-frequency nonlinear radar is presented for detecting radio frequency electronic targets of interest. The radar transmits 20 frequencies (“tones”) between 890 and 966 MHz, at ...Nonlinear radar exploits a completely different phenomenon: it relies on the nonlinear properties of a target to convert a portion of the incident radar wave into a reflected wave at a different frequency. Most materials found in nature are linear (with the exception of ferromagnetics),Radar range rate measurements are not always used in target tracking filters because they are highly nonlinear in Cartesian space. A linear approximation of range rate composed of its partial ...

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Furthermore, we use the random forest algorithm with predicted radar and satellite data to estimate the rainfall rate, and the results outperform those of the traditional, nonlinear radar ...Nonlinear radars can be utilized to detect electronic devices, which are difficult to detect with conventional radars due to their small radar cross sections (RCS). Since the receiver in a nonlinear radar is designed to only receive harmonic or intermodulated echoes from electronic devices, it is able to separate electronic devices from non-electronic scatters (clutter) by rejecting their ...Nonlinear radar exploits the difference in frequency between radar waves that illuminate and are reflected from electromagnetically nonlinear targets. Harmonic radar is a special type of nonlinear radar that transmits one or multiple frequencies and listens for frequencies at or near their harmonics. Signal processing for radar systems is a vast and fascinating discipline that covers numerous techniques and touches on several of application areas. The history of radar began more than one hundred years ago, in 1904, when Christian Hülsmeyer demonstrated the first experimental radar in Cologne, Germany [GRI19]. The banks of …Nonlinear regression. In statistics, nonlinear regression is a form of regression analysis in which observational data are modeled by a function which is a nonlinear combination of the model parameters and depends on one or more independent variables. The data are fitted by a method of successive approximations.With the development of information technology for modern military confrontations, radar emitter fingerprint identification has become a hot and difficult topic in the field of electronic warfare, especially in the field of electronic reconnaissance. Owing to the confidentiality of military systems, most of the existing studies use simulation data for radar emitter fingerprint identification ... Since the receiver in a nonlinear radar is designed to only receive harmonic or intermodulated echoes from electronic devices, it is able to separate electronic devices from non-electronic scatters (clutter) by rejecting their echoes at fundamental frequencies.May 20, 2022 · This paper presents an extensive review of nonlinear response-based radar systems. Nonlinear radars are generally used for clutter suppression purposes. These radars detect the nonlinear response generated by diodes and transistors are used as a tag for target localization. Presented in this paper is the evolution of nonlinear radar at the United States Army Research Laboratory (ARL) and recent results of short-range over-the-air harmonic radar tests there.We believe that this empirical formulation cannot describe the nonlinear relationship between the radar echo intensity and the rainfall rate. Therefore, random forest machine learning regression techniques are used to describe this relationship. The weather radar data and precipitation data 1 h before the prediction time are used for training.

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This work presents a review on the concept of harmonic or secondary radar, where a tag or transponder is used to respond at a harmonic multiple of the incoming interrogation signal. In harmonic radar, the tag is called a harmonic transponder and the necessary frequency multiplication is implemented using a nonlinear element, such as a Schottky diode. Different applications and operating ...The problem of determination of combined response signal (RS) from the obstacle nonlinear scatterers (NS) by a special system of preliminary nonlinear sounding (SPNS) in nonlinear radar is examined.Explore the latest full-text research PDFs, articles, conference papers, preprints and more on HARMONICS. Find methods information, sources, references or conduct a literature review on HARMONICSNonlinear radars can be utilized to detect electronic devices, which are difficult to detect with conventional radars due to their small radar cross sections (RCS). Since the receiver in a nonlinear radar is designed to only receive harmonic or intermodulated echoes from electronic devices, it is ab …Takak Y, Hayvaci H and Yetik I (2021) A Hybrid Simulation Model for Characterization of Nonlinear Circuits Using Harmonic Radar 2021 13th International Conference on Electrical and Electronics Engineering (ELECO), 10.23919/ELECO54474.2021.9677885, 978-605-01-1437-9, (239-242)Weather report for Blagoevgrad. Overnight into Monday it is mostly cloudy, but most clouds give way on Monday morning. In the afternoon clear skies prevail. It is a sunny day. Temperatures as high as 66 °F are foreseen. Overnight into Monday a gentle breeze is expected (8 to 12 mph). By day expect a moderate breeze (12 to 18 mph).The principle-of-operation of nonlinear radar is summarized and applications for this technology are listed. Targets addressed by this type of radar follow a power-series model, and from this model a nonlinear radar range equation is derived.Rain? Ice? Snow? Track storms, and stay in-the-know and prepared for what's coming. Easy to use weather radar at your fingertips!We propose nonlinear beamforming for phased array weather radars (PAWRs). Conventional beamforming is linear in the sense that a backscattered signal arriving from each elevation is reconstructed by a weighted sum of received signals, which can be seen as a linear transform for the received signals. For distributed targets such as raindrops, however, the number of scatterers is significantly ...In the context of nonlinear radar, no more harmonic may be reflected from the target. Furthermore, additional increases in power beyond the saturation point may cause other nonlinearities to activate, which reduce the harmonic reflected from the target. ….

Hongsoo Park's 3 research works with 10 citations and 111 reads, including: Detection of Electronic Devices Using FMCW Nonlinear RadarNon-linear SAR technique uses a combination of platform manoeuvre and novel processing to separate the effects of a target's radial velocity and cross-range displacement, giving accurate estimates of both.A radar assembly for receiving signals at spaced frequencies from an unknown transmitting source comprising a receiver operative to receive signals; the receiver comprising a series of channels, each channel comprising a low pass filter configured to allow passage of a signal from an unknown transmitting source, an analog to digital converter configured to …The nonlinear radar range equation has been defi ned in the literature but a step by step derivation is lacking and no experimental validation has been shown. This paper starts with a nonlinear ...This paper is focused on nonlinear frequency modulated radar signals. Along with LFM, it is one of the first conceived radar waveforms. NLFM’s advantage over LFM comes from its naturally low sidelobes level, attainable without a need of mismatched processing, which is not the case for LFM.A harmonic radar is a system that illuminates a region of space with radiofrequency waves and receives the harmonics of the transmitted frequencies generated by any non-linear device present in ...Nonlinear FM waveforms offer a radar matched filter output with inherently low range sidelobes. This yields a 1-2 dB advantage in Signal-to-Noise Ratio over the output of a Linear FM waveform with equivalent sidelobe filtering. This report presents design and implementation techniques for Nonlinear FM waveforms.Sep 1, 2018 · The nonlinear radar range equation has been defi ned in the literature but a step by step derivation is lacking and no experimental validation has been shown. This paper starts with a nonlinear ... A nonlinear function in math creates a graph that is not a straight line, according to Columbia University. Three nonlinear functions commonly used in business applications include exponential functions, parabolic functions and demand funct... Nonlinear radar, Nonlinear Frequency Modulated (NLFM) waveforms utilize a nonlinear modulation function to achieve a tapered spectrum which results in low Auto-Correlation Function (ACF) sidelobes. Previous efforts in the literature have mostly focused on designing NLFM modulation functions which result in a spectral shape that closely resembles the many …, Nonlinear multidimensional signal processing is a subset of signal processing ( multidimensional signal processing ). Nonlinear multi-dimensional systems can be used in a broad range such as imaging, [1] teletraffic, communications, hydrology, geology, and economics. Nonlinear systems cannot be treated as linear systems, using Fourier ..., Discover the nonlinear methods and tools needed to design real-world microwave circuits with this tutorial guide. Balancing theoretical background with practical tools and applications, it covers everything from the basic properties of nonlinear systems such as gain compression, intermodulation and harmonic distortion, to nonlinear circuit analysis and simulation …, The work uses nonlinear models for radar range trackers developed in [1]. The noise-induced transitions found in this work result in unanticipated changes in the bifurcation behavior of the ..., Dec 9, 2021 · In harmonic radar applications, images produced using algorithms of conventional radar applications experience some defocusing effects of the electronic targets’ impulse responses. This is typically explained by the dispersive transfer functions of the targets. In addition, it was experimentally observed that objects with a linear transfer behavior do not contribute to the received signal of ... , The target tracking of nonlinear maneuvering radar in dense clutter environments is still an important but difficult problem to be solved effectively. Traditional solutions often rely on motion models and prior distributions. This paper presents a novel improved architecture of Kalman filter based on a recursive neural network, which combines the sequence learning of recurrent neural networks ..., nonlinear character of the electronic targets. Here, motivated by the analysis of measured harmonic radar data, the effects of both phenomena are investigated by theoretical derivations and simulation studies. By analyzing measurement data, we show that the dispersion effects are caused by the target, , transmit power is required for nonlinear radar to generate a signal -to-noise ratio comparable to that of traditional linear radar at the same distance R . Although nonlinear reflections from electronic devices are weak , the frequencies produced by these devices (e.g. 2f0, 3f0) are vastly different from the original transmit set (e.g. f0 only ..., Abstract and Figures. This paper presents an extensive review of nonlinear response-based radar systems. Nonlinear radars are generally used for clutter suppression purposes. These radars detect ..., The principle-of-operation of nonlinear radar is summarized and applications for this technology are listed. Targets addressed by this type of radar follow a power-series model, and from this model a nonlinear radar range equation is derived., Abstract. Nonlinear FM waveforms offer a radar matched filter output with inherently low range sidelobes. This yields a 1-2 dB advantage in Signal-to-Noise Ratio over the output of a Linear FM waveform with equivalent sidelobe filtering. This report presents design and implementation techniques for Nonlinear FM waveforms., With the development of information technology for modern military confrontations, radar emitter fingerprint identification has become a hot and difficult topic in the field of electronic warfare, especially in the field of electronic reconnaissance. Owing to the confidentiality of military systems, most of the existing studies use simulation data for radar emitter fingerprint identification ..., While weather radar is widely used for quantitative precipitation estimation (QPE) in China and many other countries, the performance of radar QPE is unsatisfactory. A major reason for inaccurate radar QPE is the application of conventional Z–R relationships. In this study the entire vertical profile of reflectivity (VPR) is taken into consideration and a new relationship …, Intermodulation Radar for RF Receiver Detections. Abstract: Nonlinear radars are often used to detect the presence of RF electronics. In the state-of-art most of …, This paper presents an extensive review of nonlinear response-based radar systems. Nonlinear radars are generally used for clutter suppression purposes. These …, nonlinear radars have been utilized for several applications in the past few years [2–4], such as wireless sensing [5]. Most often, nonlinear radars are harmonic. Thus, the radar performance can ..., Dec 15, 2021 · This paper presents a new SIMO radar system based on a harmonic radar (HR) stepped frequency continuous wave (SFCW) architecture. Simple tags that can be electronically individually activated and deactivated via a DC control voltage were developed and combined to form an MO array field. This HR operates in the entire 2.45 GHz ISM band for transmitting the illumination signal and receives at ... , A simultaneous-frequency nonlinear radar is presented for detecting radio frequency electronic targets of interest. The radar transmits 20 frequencies (“tones”) between 890 and 966 MHz, at ..., clutter to the radar is 1 m. The path loss from the radar to the nonlinear target is 40.50 dB, from the nonlinear target to the radar of 2nd-order harmonic radar is 46.52 dB, and from the nonlinear target to the 3rd-order harmonic radar is 50.04 dB. The radar received signal power is -78.85 dBm, and -82.2 dBm in the , The target tracking of nonlinear maneuvering radar in dense clutter environments is still an important but difficult problem to be solved effectively. Traditional solutions often rely on motion ..., For the present implementation of ARL’s nonlinear radar, the transmit waveform is a chirp which sweeps one frequency at constant amplitude over an ultra-wide bandwidth (UWB). The receiver ..., ... radar, lidar and camera. Show more. At a glance. Institution: ChalmersX ... Implement key nonlinear filters in Matlab, in order to solve problems with ..., Non-linear or 'harmonic' radars were first introduced in the 1970s; since then, the range of applications for this technology has grown [9]. Harmonic radars have been …, The synthesis method concerning the nonlinear frequency modulation radar signal is presented in the paper. For the radar ambiguity function calculation the Zak transform is used in the method. The ..., Rain? Ice? Snow? Track storms, and stay in-the-know and prepared for what's coming. Easy to use weather radar at your fingertips!, A radar assembly for receiving signals at spaced frequencies from an unknown transmitting source comprising a receiver operative to receive signals; the receiver comprising a series of channels, each channel comprising a low pass filter configured to allow passage of a signal from an unknown transmitting source, an analog to digital converter configured to …, ICEYE's technology gives companies and governments unprecedented access to the shape of things on Earth. The images below, created by a radar satellite built and operated by a private company, are a taste of a future in which anyone can pur..., Non-imaging radar provides basic EM energy reflections which can provide information about “things” out there that possess EM reflection characteristics., Multi-sensor data fusion and Orbit determination with nonlinear estimation for space debris RADAR. Sanat K. Biswas. Mar 1, 2023 SSA. Due to increased human ..., In contrast to the linear FMCW, nonlinear frequency modulations are also frequently encountered for radar applications 56,57,58, hence we need to investigate the nonlinear FMCW generations. Three ..., Nonlinear characteristics of the devices are recorded as a response to a frequency-swept signal with constant power. The harmonic characteristics of electronic devices are described by statistical and Fourier feature sets., Remote Sens. 2021, 13, 4982 2 of 22 The paper is divided into six sections. A brief comparison between the nonlinear radar and conventional radar path loss model and sensitivity issues are ...