scholarly journals Research on Space-time Blocking Matrix Algorithm Based on Frequency Diverse Array

2020 ◽  
Author(s):  
Yanping Liao ◽  
Zenan Wu
Keyword(s):  
Phased Array ◽  
Mimo Radar ◽  
Space Time ◽  
Beam Pattern ◽  
Specific Structure ◽  
Interference Signal ◽  
Good Shape ◽  
Frequency Diverse Array ◽  
Blocking Matrix ◽  
Simulation Results

Abstract Because the beam pattern of the conventional phased array or MIMO radar is only related to the angle dimension, it is difficult to suppress the incident interference when it is in the mainlobe or at the same angle of the desired signal. According to the development demand of mainlobe anti-interference technology. In this paper, a space - time blocking matrix processing algorithm based on FDA is proposed. The algorithm gives the specific structure of the blocking matrix, which can not only avoid the interference of the same angle and different distances, but also eliminate the interference signal in the direction of the mainlobe without affecting the energy of other incident signals, so as to ensure the good shape of the beam pattern. The simulation results show that the algorithm can successfully suppress the mainlobe interference and has good beam-conformal.

scholarly journals Mainlobe Jamming Suppression Using Improved Frequency Diverse Array with MIMO Radar

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Guang-ming Li ◽  
Qun Zhang ◽  
Qi-yong Liu ◽  
Jia Liang ◽  
Dan Wang ◽  
...  
Keyword(s):  
Multiple Input Multiple Output ◽  
Logistic Map ◽  
Mimo Radar ◽  
Line Of Sight ◽  
Waveform Diversity ◽  
Multiple Beams ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Frequency Diverse Array ◽  
Simulation Results

Frequency diverse array (FDA) has attracted much attention in recent years due to its range-angle-dependent beampattern. Multiple-input multiple-output (MIMO) radar can offer waveform diversity to increase the virtual aperture length for azimuth coherent focus processing in radar imaging. Combining the advantages of FDA and MIMO radar, FDA-MIMO radar can steer multiple beams to different targets in the same line of sight (LOS) of radar with different waveforms. In this paper, an improved FDA model with the logistic map is proposed to get the aperiodic and range-angle uncoupling beampattern. Based on the proposed FDA, combining the FDA-MIMO radar, the waveform and chirp rate jitter techniques are adopted to mainlobe jamming suppression. Simulation results show the effectiveness of the proposed method.

scholarly journals Frequency Diverse Array Radar Cramér-Rao Lower Bounds for Estimating Direction, Range, and Velocity

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Yongbing Wang ◽  
Wen-Qin Wang ◽  
Huaizong Shao
Keyword(s):  
Lower Bounds ◽  
Gaussian Noise ◽  
Phased Array ◽  
Fundamental Question ◽  
Phased Array Radar ◽  
Distinct Frequency ◽  
Element Number ◽  
Frequency Diverse Array ◽  
Simulation Results ◽  
Radar Frequency

Different from phased-array radar, frequency diverse array (FDA) radar offers range-dependent beampattern and thus provides new application potentials. But there is a fundamental question: what estimation performance can achieve for an FDA radar? In this paper, we derive FDA radar Cramér-Rao lower bounds (CRLBs) for estimating direction, range (time delay), and velocity (Doppler shift). Two different data models including pre- and postmatched filtering are investigated separately. As the FDA radar has range-angle coupling, we use a simple transmit subaperturing strategy which divides the whole array into two subarrays, each uses a distinct frequency increment. Assuming temporally white Gaussian noise and linear frequency modulated transmit signal, extensive simulation examples are performed. When compared to conventional phased-array radar, FDA can yield better CRLBs for estimating the direction, range, and velocity. Moreover, the impacts of the element number and frequency increment are also analyzed. Simulation results show that the CRLBs decrease with the increase of the elements number and frequency increment.

Research on MIMO Radar Based on Orthogonal Signal in the Present of Non-Ideal Factor

2015 ◽  
Vol 9 (1) ◽  
pp. 579-583
Author(s):  
Zhi-Ming Dong ◽  
Jian-Kui Zeng
Keyword(s):  
Error Probability ◽  
Phased Array ◽  
Statistical Error ◽  
Mimo Radar ◽  
Theory Model ◽  
Simulation System ◽  
Limiting Factor ◽  
Orthogonal Signal ◽  
Simulation Results ◽  
Weak Target

Non-ideal factors of transmitting signal are known as a kind of restriction to the performance of radar, especially the ability of finding the weak target. In this paper, the performance of MIMO radar in the aspect of weak target detection is researched. Firstly, the theory model of MIMO signal is presented. And then, a simulation system based on orthogonal signal is established. In this simulation platform, the performance of MIMO radar and phased array radar are studied. Simulation results show that for the same receiver limiting factor, the statistical error probability of MIMO radar is much lower than traditional phased array mode.

scholarly journals Frequency Diverse Array MIMO Radar Adaptive Beamforming with Range-Dependent Interference Suppression in Target Localization

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Kuandong Gao ◽  
Huaizong Shao ◽  
Jingye Cai ◽  
Hui Chen ◽  
Wen-Qin Wang
Keyword(s):  
Lower Bound ◽  
Phased Array ◽  
Interference Suppression ◽  
Doa Estimation ◽  
Mimo Radar ◽  
Adaptive Beamforming ◽  
Target Localization ◽  
Equal Angle ◽  
Multiple Input ◽  
Frequency Diverse Array

Conventional multiple-input and multiple-output (MIMO) radar is a flexible technique which enjoys the advantages of phased-array radar without sacrificing its main advantages. However, due to its range-independent directivity, MIMO radar cannot mitigate nondesirable range-dependent interferences. In this paper, we propose a range-dependent interference suppression approach via frequency diverse array (FDA) MIMO radar, which offers a beamforming-based solution to suppress range-dependent interferences and thus yields much better DOA estimation performance than conventional MIMO radar. More importantly, the interferences located at the same angle but different ranges can be effectively suppressed by the range-dependent beamforming, which cannot be achieved by conventional MIMO radar. The beamforming performance as compared to conventional MIMO radar is examined by analyzing the signal-to-interference-plus-noise ratio (SINR). The Cramér-Rao lower bound (CRLB) is also derived. Numerical results show that the proposed method can efficiently suppress range-dependent interferences and identify range-dependent targets. It is particularly useful in suppressing the undesired strong interferences with equal angle of the desired targets.

scholarly journals A Combined ESPRIT-MUSIC Method for FDA-MIMO Radar with Extended Range Ambiguity Using Staggered Frequency Increment

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Yuwei Song ◽  
Guimei Zheng ◽  
Guoping Hu
Keyword(s):  
Estimation Algorithm ◽  
Mimo Radar ◽  
Joint Estimation ◽  
Range Estimation ◽  
Range Ambiguity ◽  
Grating Lobe ◽  
Frequency Diverse Array ◽  
Simulation Results ◽  
Esprit Algorithm ◽  
Dimensional Range

For the problem of joint angle and range estimation with frequency diverse array (FDA), MIMO radar, staggered frequency increment is proposed to expand the range ambiguity and the joint algorithm of ESPRIT and MUSIC is proposed to reduce the computational complexity. The uniformly weighted beampattern of FDA is a SINC-like function. Therefore, the grating lobe of range estimation exists. In this paper, staggered frequency increment is proposed to increase the distance of adjacent grating lobes. The proposed joint estimation algorithm firstly estimates the angle by using ESPRIT algorithm. Then we get the range estimation by MUSIC one-dimensional range search using the above estimated angle. In simulation results section, it is indicated in simulation results that the proposed method improves the range grating lobe and reduces the complexity.

scholarly journals Cognitive MIMO Frequency Diverse Array Radar with High LPI Performance

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Ling Huang ◽  
Kuandong Gao ◽  
Zhiming He ◽  
Jingye Cai
Keyword(s):  
Optimization Problem ◽  
Target Location ◽  
Multiple Input Multiple Output ◽  
Mimo Radar ◽  
Beam Pattern ◽  
Multiple Input ◽  
Convex Problem ◽  
Input Multiple Output ◽  
Frequency Diverse Array ◽  
Low Probability

Frequency diverse array (FDA) has its unique advantage in realizing low probability of intercept (LPI) technology for its dependent beam pattern. In this paper, we proposed a cognitive radar based on the frequency diverse array multiple-input multiple-output (MIMO). To implement LPI of FDA MIMO transmit signals, a scheme for array weighting design is proposed, which is to minimize the energy of the target location and maximize the energy of the receiver. This is based on the range dependent characteristics of the frequency diverse array transmit beam pattern. To realize the objective problem, the algorithm is proposed as follows: the second-order nonconvex optimization problem is converted into a convex problem and solved by the bisection method and convex optimization. To get the information of target, the FDA MIMO radar is proposed to estimate the target parameters. Simulation results show that the proposed approach is effective in decreasing the detection probability of radar with lossless detection performance of the receive signal.

A Linear Acoustic Phased Array for Nonreciprocal Transmission and Reception

2020 ◽  
Author(s):  
R. Adlakha ◽  
M. Moghaddaszadeh ◽  
M. A. Attarzadeh ◽  
A. Aref ◽  
M. Nouh
Keyword(s):  
Phase Modulation ◽  
Frequency Conversion ◽  
Phased Array ◽  
Space Time ◽  
Mathematical Framework ◽  
Sound Waves ◽  
Asymmetric Transmission ◽  
Time Modulation ◽  
Dynamic Phase ◽  
Phase Angles

Abstract Acoustic phased arrays are capable of steering and focusing a beam of sound via selective coordination of the spatial distribution of phase angles between multiple sound emitters. Here, we propose a controllable acoustic phased array with space-time modulation that breaks time-reversal symmetry, and enables phononic transition in both momentum and energy spaces. By leveraging the dynamic phase modulation, the proposed linear phased array is no longer bound by the reciprocity principle, and supports asymmetric transmission and reception patterns that can be tuned independently. Through theoretical and numerical investigations, we develop and verify a mathematical framework to characterize the nonreciprocal phenomena, and analyze the frequency conversion between the wave fields. The space-time acoustic phased array facilitates unprecedented control over sound waves in a variety of applications including underwater telecommunication.

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