Results 11 to 20 of about 122 (113)

Polarization microwave correlation imaging method based on orthogonal complement space

Electronics Letters, 2023
Currently, microwave correlation imaging (MCI) is regarded as an important method to address the forward‐looking imaging problem in radar. The key step of this method is to form a spatio‐temporal two‐dimensional random radiation field through various ...
Runkun Tian, Dahai Dai, Penghui Ji, Bo Pang, Shilong Sun   +4 more
doaj   +2 more sources

Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars

IEEE Open Journal of Antennas and Propagation, 2022
The Multiple-Input Multiple-Output (MIMO) radar combines the signals from multiple transmit and receive elements separately to form a virtual array. Consequently, system imperfections in the MIMO radar caused by channel imbalance and mutual coupling are ...
Ricard L. Grove, Jorgen Dall, Poul Leth-Espensen   +2 more
doaj   +1 more source

A Sidelobe Suppression Method for Circular Ground-Based SAR 3D Imaging Based on Sparse Optimization of Radial Phase-Center Distribution

Remote Sensing, 2022
Circular ground-based SAR (GBSAR) is a new 3D imaging GBSAR with the potential of acquiring high-quality 3D SAR images and 3D deformation. However, its donut-shaped spectrum and short radius of antenna rotation cause high sidelobes on 3D curved surfaces,
Qiming Zhang, Jinping Sun, Yanping Wang, Yun Lin   +3 more
doaj   +1 more source

Design of multiple‐input multiple‐output radar amplitude‐bounded waveforms with desired ambiguity function based on sequential quadratic programming

IET Radar, Sonar &Navigation, Volume 17, Issue 12, Page 1863-1873, December 2023., 2023
In this study, an efficient and novel algorithm based on the SQP framework and NCG method has been developed to design amplitude‐bounded sequence sets with a desired ambiguity function for MIMO radar. Numerical experiments demonstrate that the proposed algorithm can suitably shape the ambiguity function and has a better performance than the existing ...
Wenyan Wei, Yinsheng Wei, Lei Yu
wiley   +1 more source

Test the Doppler Effects of Codes That Generated by Genetic Algorithm Using Ambiguity Function

Diyala Journal of Engineering Sciences, 2015
Using pulse compression at the receiver side of communication systems yields sidelobes around the mainlobe that permits the clutter to pass through it, and mask the desired signal.
Abbas Salman Hameed
doaj   +1 more source

Chaotic Coding for Interference Suppression of Digital Ionosonde

Remote Sensing, 2023
External interference in ionospheric sounding seriously degrades the quality of echo signals and data; thus, it should be eliminated. This paper presents a method for suppressing interference using chaotic coding with a set of Bernoulli map sequences ...
Sijia Han, Wei Guo, Peng Liu, Te Wang, Caiyun Wang, Qingyu Fang, Jian Yang, Lingling Li, Dapeng Liu, Jianping Huang   +9 more
doaj   +1 more source

Frequency diverse array beampattern synthesis method with low sidelobes by integrating mayfly algorithm and convex programming

Electronics Letters, Volume 59, Issue 21, November 2023., 2023
The range‐angle coupling characteristics of traditional frequency diverse array (FDA) will deteriorate target localization performance. To address this problem, several decoupling methods for FDA have been developed in the past decade, mainly including deterministic methods and global optimization methods.
Mengxuan Xiao, Xiaolang Shao, Taiyang Hu, Jinyu Zhang, Zelong Xiao   +4 more
wiley   +1 more source

Analysis of Non Linear Frequency Modulation (NLFM) Waveforms for Pulse Compression Radar

Jurnal Elektronika dan Telekomunikasi, 2018
Non Linear Frequency Modulation (NLFM) method can suppress the peak sidelobe level without additional windowing function. NLFM doesn’t require any weighting function because it has inbuilt one.
Muhamad Ridwan Widyantara, Sugihartono -, Fiky Y. Suratman, Slamet Widodo, Pamungkas Daud   +4 more
doaj   +1 more source

Synthesis of frequency diverse array with large null depths via a hybrid optimisation approach of mayfly algorithm and convex programing

IET Signal Processing, Volume 16, Issue 9, Page 1085-1093, December 2022., 2022
Abstract By controlling the null distribution in the range‐angle dimension, the frequency diverse array (FDA) can handle range‐dependent interference, which is usually difficult to solve for the traditional phased array. However, the current investigations focus more on the design of weights for null control, ignoring the unique design dimension of FDA,
Xiaolang Shao, Taiyang Hu, Jinyu Zhang, Zelong Xiao   +3 more
wiley   +1 more source

Optimisation of practically constrained waveforms for Rician target detection with multiple‐input‐multiple‐output radar

IET Radar, Sonar &Navigation, Volume 16, Issue 7, Page 1116-1130, July 2022., 2022
Abstract In this paper, the waveform design for Rician target detection with multiple‐input‐multiple‐output radar is addressed. The relative entropy between the distributions of the observations under two hypotheses is employed as the design metric. Due to the difficulty of tackling the non‐convex waveform design problem, a novel algorithm based on ...
Xuyang Wang, Bo Tang, Ming Zhang
wiley   +1 more source