Range ambiguity is common for estimating range with the multiple-input and multiple-out (MIMO) radar employing elevated pulse repetition frequency (PRF). Despite that diverse array (FDA) or element-pulse coding (EPC) in transmitter provides possibility resolving at a single PRF, involved orthogonal waveform sequences are unpractical pulse-Doppler radars. In this paper, MIMO-based hybrid of FDA EPC investigated to mitigate enhance resolution, which so called EPC-FDA-MIMO. Employing ampliative...

In dual-channel synthetic aperture radar (SAR) systems, the estimation of four-dimensional motion parameters ground maneuvering target is a critical challenge. particular, when spatial degrees freedom are used to enhance target’s output signal-to-clutter-plus-noise ratio (SCNR), it possible have multiple solutions in parameter target. To deal with this issue, novel algorithm for estimating moving targets SAR systems proposed paper. First, random sample consensus (RANSAC) and modified...

To tackle the challenge of enhancing moving target detection performance in environments characterized by small sample sizes and non-uniformity, methods rooted sparse signal reconstruction have been incorporated into Space-Time Adaptive Processing (STAP) algorithms. Given prominent nature clutter spectra angle-Doppler domain, adopting recovery algorithms has proven to be a feasible approach for accurately estimating high-resolution spatio-temporal two-dimensional spectra. Sparse Bayesian...

This paper describes an ambiguity resolving approach for slant-range velocity estimation which utilizes the wideband characteristic of transmitted signal (multiple wavelengths). Based on wavelength dual-wavelength radar data. Then, two effective approaches are introduced to focus moving target no matter Doppler exists or not. The is estimated by number azimuth cell displacements between focused images. Both imaging methods have different properties and advantages. A performance analysis...

When airborne forward looking planar antenna is used to detect ground moving target, targets may be masked by strong clutter due high sidelobes of the pattern.In this paper, transmitting pattern synthesized via convex optimization in order suppress from ground.Transmitting has a low sidelobe illuminating short ranges and focused into sky remote ranges, which results relative small beamwidth elevation plane.In azimuthal plane, can form some notches fixed directions where interference...

With the rapid development of electronic information technology, forms and technologies warfare have become more complicated, countermeasures (ECMs) counter-countermeasures (ECCMs) fierce in recent years. Networked radars an important means ECMs due to their “four anti-resistance performance” against jamming, anti-stealth, anti-radiation missiles, low-altitude penetration. Based on this, this paper evaluates performance range deception jamming air-based jammer a ground-based radar network....

The rank of the sparse signals brought by multiple measurement vectors (MMV) augments performance joint recovery. In general, suppose sparsity level k is less than or equal to [rank( <b xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">X</b> )+spark( xmlns:xlink="http://www.w3.org/1999/xlink">A</b> )-1]/2, sparsest solution MMV problem unique and recoverable via various methods. It shown in this letter that up spark( )-1 actually exists a measure...

Sea clutter magnitude distribution exhibits important guiding significance for the design of marine target detection algorithms and selection constant false alarm rate (CFAR) threshold. In this letter, to deal with limitation traditional generalized-K (GK) in highly heterogeneous scene, a modified GK (MGK) is proposed sea magnitude. By combining generalized Pareto distributions, value range power parameter applicable model are extended. The applicability verified by real-measured data.

This paper propose a new multiple-input multipleoutput (MIMO) signal processing scheme that combines optimum transmit and receive beamforming with the Alamouti space-time block code (STBC) transmission modifies decoding process.The uses double antenna array groups to achieve stable performance regardless of direction arrived (DOA) angular spread (AS).In multiuser MIMO communications scenario, suppresses co-channel interference (CCI) by maximizing uplink...

In ground-penetrating radar (GPR) subsurface target reconstruction, various techniques based on amplitude (or energy) information of echoes from metal with small size can work well. However, for environmental and geological applications, the quantitative analysis target's geometric features, like location, shape size, is exactly what we are concerned about. Amplitude-based reconstruction method faces challenges in these applications. A large sloped under surface may lead to abundant virtual...

A new two-stage beamformer for coherent signal reception is proposed. The first stage extracts all the signals from an antenna array using their direction-of-arrival information, and then resultant are coherently combined in second stage. Simulation results included to demonstrate effectiveness of proposed technique.

空时自适应处理(STAP)作为动目标检测的关键技术，但是非均匀环境将会造成协方差矩阵的估计误差，进而严重影响STAP性能。对角加载主要用于改善空间滤波器对于有用信号空域特征失配和空域协方差矩阵失配的稳健性。该文考虑将对角加载应用于STAP协方差矩阵失配(统计失配)时的性能改善，即在实际的协方差矩阵和其估计值之间存在误差时，通过对角加载改善STAP的稳健性。文中给出了加载电平的选择方法，并进行了详细的性能分析，即合理的对角加载可以提高检测概率和输出信噪比。仿真分析验证了理论分析的正确性。

The performance of high-resolution algorithm will degrade badly in the presence sensor position errors. To deal with this problem, a mew method for array calibration using particle swarm optimization (PSO) is proposed. This new has no requirement sources while errors as well direction-of-arrivals (DOAs) incident signals can be estimated simultaneously. Computer simulations are conducted to show validity and feasibility proposed method. (3 pages)

Phase-switched screens (PSS) has the characteristics of dynamic regulatory radar scattering direction, and traditional PSS can only analyze reflection state under infinite large size without considering angle scattering. Here we introduce time modulation theory to for corner analysis, which realize frequency spectrum movement target stealth in radar-tar get-receiver chanel transmission. The simulation analysis be realized signal at center by switching different array elements. When opposite...

Due to the complex electromagnetic environment, airborne Synthetic Aperture Radar (SAR) system is faced with challenge of missing part echo data, leading degradation on SAR imaging performance. To solve this problems, a novel sparse algorithm based low rank matrix completion proposed in paper. Based mechanism joint aperture and bandwidth synthesis, two-dimensional BP-based model constructed at first. And then, basis above model, concept introduced paper, reconstruct elements signals...

A method of current velocity estimation using airborne sea data is proposed. The are collected by circular synthetic aperture radar. range Doppler image can be acquired after and azimuth compression for each beam scan angle. corresponding average spectrum obtained fitted to Gaussian shape well. Hence, the centre shift represented mean spectrum. It observed that varies with angle variation approximately a sinusoid‐shape function. direction in local area fixed so radial caused harmonic...

With the increase in satellite communication interference, tri-satellite time difference of arrival (TDOA) localization technique, which is an effective method to determine location interference using sensors or antennas, has been developed rapidly. The source determined through intersection TDOA lines position (LOP). However, when two LOP have mirrored points, it theoretically difficult real location. Aiming at this problem, a for eliminating based on multiple moment proposed paper. First,...

An augmented covariance matrix, which has the characteristics of Hermitian and Toeplitz, is constructed for minimum redundancy (MR) multiple-input multiple-output (MIMO) radar to implement direction finding using Capon algorithm. A diagonal loading technique employed avoid non-positive definite matrix. The level adjusted adaptively according eigenvalues proposed method not only expands system degrees-of-freedom (DOFs), but also robust spatial spectrum estimation performance. In addition,...

A novel technique to estimate gain and phase uncertainty of a vector sensor is presented in this paper. Based on the estimation electromagnetic vectors two reference sources, computational formulas for are given. Finally, CRLB derived very efficiency new method.