A novel quasi-coherent noise jamming method is proposed against linear frequency modulation (LFM) signal and pulse compression radar.Based on the structure of digital radio memory (DRFM), acquired by pseudo-random sequence phase-modulation sampled radar signal.The characteristic in time domain analyzed detail.Results ambiguity function indicate that blanket effect along range direction will be formed when passes through matched filter.By flexible controlling parameters interrupted-sampling...

In this paper, a novel coherent noise jammer is proposed against the pulse compression radar. The algorithm implemented by modulating sampled radar signal according to pseudo-random sequence. A high speed ADC adopted sample baseband from 50 MHz 1150 and parallel data processing in FPGA of Virtex-6 introduced. characteristic jamming time domain frequency analyzed detail. Mathematic expressions indicate that multiple false targets are induced after real target protected effectively. Compared...

This paper presents a jamming method based on shift-frequency theory against linear frequency modulation (LFM) radar. The basic idea is first storing the phase of hostile radar signal and then transmitting modulated signal. According to structure digital radio memory (DRFM), acquired by I channel Q samples. Then time-variable added obtain this characteristic matched filter, will cause hysteresis or precede false target. Based single target, implementation multiple target FIFO introduced. And...

This paper proposes a deception jamming method against inverse synthetic aperture radar on the basis of simplified convolution method. Samples wideband signal are extracted using sub-Nyquist sampling signal. A is then generated by parallel and high-resolution range profile target model. Introducing transforms into formation, which has simpler structure can be computed in real time. Furthermore, computation complexity reduced. The contains scattering movement properties model, thus able to...

As application complexity continues to grow, using multicore processors has been proved be an effective methodology meet the ever-increasing processing demand across industry association. The Master/Slave model, Data Flow model and OpenMP are three dominant models for parallel programming. In this paper, first two briefly discussed while is focused. Some factors (e.g. number of threads, scheduling strategy, load balance, etc.) that affecting execution performance programs were also studied...

The direction-of-arrival (DOA) estimation accuracy is sensitive to the unknown mutual coupling in antenna array. This paper proposes an online array calibration method which jointly estimates DOAs and coupling. Taking advantage of Toeplitz property matrix (MCM) with uniform linear (ULA), we handle joint problem by exploiting block sparse Bayesian learning (BSBL) framework. does not need calibrating sources or preliminary MCM. Due robustness BSBL, this also effective under coherent scenario....

Repeater jamming has become an important type for countering coherent radar since it is proposed. In this paper, a noise method based on interrupted-sampling and pseudo-random sequence phase-modulation proposed against de-chirping radar. The characteristic of signal analyzed in detail the processing procedure introduced. After De-chirping, multiple dense false-targets are formed to protect true target. Compared with non-coherent jamming, much correlation capable obtaining gain. At last, some...

A statistical analysis that properly characterizes sea clutter processes is indispensable both for optimum detection algorithm design and performance prediction problems in maritime surveillance applications. In this paper, we present the of experimental data collected by a high-resolution coherent monopulse radar. First, amplitude analyses these data. The results show <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>K</mml:mi></mml:mrow></mml:math>, Pareto,...

Airborne target's micro-motion such as rotation or vibration causes phase modulation, termed micro-Doppler effect, into radar signals.The feature of micromotion is one the most obvious features for recognition in mid-course phase.In traditional works, it assumed that scatterer same ballistic target.However, with variation aspect angle ISAR, position changes.In this paper, movement a missile modeled and analyzed.A false target jamming method proposed by combining modulation electromagnetic...

A blanket noise jamming method based on sawtooth wave frequency shift is proposed in this paper. The characteristic of the signal analyzed detail domain. Due to modulation, modulated dis-matched with matched filter and output signal's pulse width spreads. periodic determines bandwidth pseudo-random sequence used create dense signals. After processed by filter, forms a rectangular covering span. amplitude main peak varies slightly effectively raises radar detection threshold. simulation...

This paper proposes a false target jamming method for countering ISAR based on two-dimensional frequency modulation. The template is created according to the image of true target. Then range modulation signal, which relates each cell template, generated using direct digital synthesizer. creation signal can be implemented parallel accelerate algorithm. All signals are added up after amplitude adjustment and Doppler phase At last derived from multiplication between intercepted radar signal....

Micro-motion characteristics of the sea corner-reflector jamming and ship are different. The corresponding time-frequency feature extracted from representation (TFR) target echo can be used to discriminate ship. Three parameters, including micro motion period, spectrum entropy maximum micro-Doppler half-period frequency difference, applied describe target. An identification method based on those parameters is presented Experiments with measured data validate effectiveness via feature.

The moving target simulator is an important but intractable issue in the performance evaluation of modern radar. consistence and correctness output echo-wave must be considered quantization error minimized to make simulated waveform more like a realistic echo. However, most simulators are based on analog method have limited capability imitating complex When properties targets change, these always need alter physical structure, which course not convenient. In this article, echo for inverse...

The millimeter wave broadband coherent radar has the capabilities of high range resolution and Doppler resolution, which provides a new approach for anti-chaff jamming. Based on echo model radar, two-dimensional profile target is derived. Then differences between echoes ship chaff jamming are analyzed. A extended detector based Otsu applied to detect region. Three characteristic parameters proposed discriminate An identification method those presented ship. Experiments with measured data...

To further improve the performance of two-dimensional (2-D) direction-of-arrival (DOA) estimation, we propose a novel method employing sparse Bayesian learning (SBL). In this new 2-D DOA estimation is divided into two independent 1-D estimations which can be resolved by SBL respectively. avoid negative effects on accuracy and signal reconstruction caused grid mismatch in reconstruction, off-grid model adopted. By exploiting self-coherent property signals, pair matching elevations azimuths...

This paper focuses on the research of inverse synthetic aperture radar (ISAR) jamming method based sinusoidal phase modulation. is used to intercept enemy's echo multiply template for modulation, then send result out. Imaging results in ISAR system could get suppressed or multi false target result. After modulation principle are expounded, simulation shows validity and feasibility this method. The relationship between amplitude frequency control parameters with effect deduced theory. In...

This paper compares measures derived from linear power spectral analysis and nonlinear chaotic of helicopter vibratory data obtained during different flight tests. In particular, the strange attractor behavior trajectory reconstructed state vectors in phase space was examined quantified using correlation dimension, which provides a fractal dimension measure regards to number active degrees freedom vibration. We have collected well tuned four-blade servo-flap rotor system conducting hover,...

A frequency domain deceptive jamming method is proposed against ISAR based on the electromagnetic property.The RCS of a 3-D vessel model computed to build up target template.The template used modulate intercepted radar signal in domain.Containing scattering property target, image induced by similar real one.The reduces computation load and successively reflects information.The correctness effectiveness validated simulation results.The shows superiority real-time convenience for engineering...

The effects of compound K ‐distributed sea clutter on angle measurement wideband monopulse radar are investigated in this paper. We apply the conditional probability density function (pdf) ratio (MR) error to analyze these effects. Based procedure radar, pdf is first deduced detail for case plus noise. Herein, spatial correlation texture components each channel and between sum difference clutters considered, two extreme situations them tackled. Referring measured data, performances various...

The coherent jamming strategy against LFM radar is one of the hottest research topics. This paper proposes a target echo cancellation method based on periodic sequence phase-modulation. Firstly, mathematic principle phase-modulation analyzed and matched filter result signal presented. Then conditions for cancellation, including time delay, phase amplitude, are discussed in detail. Finally, verified by simulations. simulation results prove correctness effectiveness proposed method. work an...

Circular array interferometer with analog phase detector requires higher signal to noise ratio than the digital detection structure, which leads lower accuracy of direction-of-arrival (DOA) estimation. T o overcome this, we proposed two kinds methods can work together. They are modified accumulation method (MPAM) and optimal baseline pair (OBPM). Modified solves problem caused by jump near ±π in structure conventional (CPAM). Taking azimuth corresponding one certain as reference, OBPM...

Based on the basic principle of multiply modulation jamming synthetic aperture radar (SAR), a new method inverse (ISAR) based three platform is proposed: at first, it needs to choose an image template which used do 2D-FFT and compensation generate template; In order get data need compute sampling interval sample last, intercept signal send out. The false target created provide effective protection for certain result This can achieve single or multiple targets, targets be adjusted according...