Results 101 to 110 of about 9,233 (214)

A Detection and Cover Integrated Waveform Design Method with Good Correlation Characteristics and Doppler Tolerance

Remote Sensing
With the increasing complexity of the electromagnetic environment, radar waveform design needs to break through the limitation of traditional single-function architectures, prompting the emergence of integrated radar waveforms.
Haoting Guo, Fulai Wang, Nanjun Li, Zezhou Wu, Chen Pang, Lei Zhang, Yongzhen Li   +6 more
doaj   +1 more source

Synthesis of MIMO Radar Sparse Arrays Using a Hybrid Improved Fireworks-Simulated Annealing Algorithm

Applied Sciences
This study proposes a hybrid optimization algorithm (IFWA-SA) integrating an improved fireworks algorithm with simulated annealing for sparse array synthesis in multiple-input multiple-output (MIMO) radar systems.
Lifei Deng, Jinran Zhao, Yunqing Liu
doaj   +1 more source

Science requirements for passive microwave sensors on earth science geostationary platforms [PDF]

It is suggested that the science requirements for passive geostationary microwave observations be met by near- and far-term sensors for each of two overlapping bands, with each band covering no more than a decade in frequency.
Gasiewski, A. J., Staelin, D. H.
core   +1 more source

SYNTHESIS OF DUAL RADIATION PATTERN OF RECTANGULAR PLANAR ARRAY ANTENNA USING EVOLUTIONARY ALGORITHM [PDF]

ICTACT Journal on Communication Technology, 2015
A pattern synthesis method based on Evolutionary Algorithm is presented to generate a dual radiation pattern from a planar array of isotropic antennas. The desired patterns are obtained by finding out optimum set of elements excitations.
Debasis Mandal, Ved Prakash Roy, Anirban Chatterjee, Anup Kumar Bhattacharjee   +3 more
doaj  

Adaptive antenna arrays for satellite communications: Design and testing [PDF]

When two separate antennas are used with each feedback loop to decorrelate noise, the antennas should be located such that the phase of the interfering signal in the two antennas is the same while the noise in them is uncorrelated.
Gupta, I. J., Swarner, W. G., Walton, E. K.   +2 more
core   +1 more source

Pattern measurements of a low-sidelobe horn antenna [PDF]

The techniques and results of power pattern measurements of a corrugated horn antenna designed for low sidelobes are reported. The power pattern was measured to levels 90 dB below the main beam maximum in both the E- and H-planes.
Bednarczyk, S. M., Gulkis, S., Janssen, M. A., Marlin, H. W., Smoot, G. F.   +4 more
core   +1 more source

A Low-complexity Beampattern Shaping Method for Large-scale Rectangular Phased Arrays

Leida xuebao
To address the high computational complexity of beamforming in large-scale rectangular phased arrays, this paper proposes a low-complexity beampattern shaping method based on dimension decoupling, which markedly enhances design efficiency and beampattern
Wenqiang WEI, Xianxiang YU, Jinghui ZHU, Guolong CUI   +3 more
doaj   +1 more source

Analysis of the Influence of Fabrication Errors on the Far-Field Performance of Si and Si₃N₄ Antennas

Photonics
Antennas are important components in optical phased arrays. However, their far-field performance deteriorates when random phase noise is introduced because of fabricating errors.
Yifan Xin, Wenyuan Liao, Lei Yu, Pengfei Ma, Zheng Wang, Yibo Yang, Licheng Chen, Pengfei Wang, Yejin Zhang, Jiaoqing Pan   +9 more
doaj   +1 more source

Statistics of the radiated field of a space-to-earth microwave power transfer system [PDF]

Statistics such as average power density pattern, variance of the power density pattern and variance of the beam pointing error are related to hardware parameters such as transmitter rms phase error and rms amplitude error.
Leininger, G., Stevens, G. H.
core   +1 more source

Technical guidance and analytic services in support of SEASAT-A [PDF]

The design of a high resolution radar for altimetry and ocean wave height estimation was studied. From basic principles, it is shown that a short pulse wide beam radar is the most appropriate and recommended technique for measuring both altitude and ...
Brooks, W. L., Dooley, R. P.
core   +1 more source