A Model-free CAF Fringe Search Algorithm with Wavelet Boosting for VLBI Observation
A Model-free CAF Fringe Search Algorithm with Wavelet Boosting for VLBI Observation
复制标题
VLBI观测中小波增强的无模型CAF条纹搜索算法
DOI:
10.1088/1538-3873/aa6f53
复制
发表时间:
2017-05
影响因子:
3.5
通讯作者:
Tong Li
中科院分区:
文献类型:
--
作者:
Zhang Tianyi;Meng Qiao;Chen Congyan;Zheng Weimin;Liu Wei;Yu Quantao;Tong Li
Very-Long-Baseline interferometry (VLBI) is a powerful tool in radio astronomy, geodesy, and deep space exploration. Priori predicted delay models are needed to make interferometry fringes, but in some cases they would be difficult to get. This paper proposes an effective algorithm named CAF-W algorithm to search fringes from the raw data in a large search range without priori predicted delay models. The cross-ambiguity function (CAF) is used to make a time-frequency correlation in the delay–delay rate plane. The wavelet boosting algorithm is used to eliminate interference and enhance the CAF peak, whose position would give the delay and delay rate estimations. Incoherent averaging and sliding search window techniques are used to overcome the wide search range and the poor signal-to-noise ratio in VLBI observations. The CAF-W algorithm could be performed with fast algorithms so the computation burden is affordable. This algorithm has successfully achieved VLBI fringes from the raw data without priori predicted delay models in VLBI observations.
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DOI:
10.1109/tassp.1980.1163391
发表时间:
1980-04
期刊:
IEEE Transactions on Acoustics, Speech, and Signal Processing
影响因子:
--
作者:
W. Adams;J. Kuhn;W. Whyland
通讯作者:
W. Adams;J. Kuhn;W. Whyland
影响因子:
8.2
作者:
T. Clark;B. Corey;James Davis;G. Elgered;T. Herring;H. Hinteregger;C. Knight;J. Levine;G. Lundqvist;Chopo Ma;E. Nesman;R. Phillips;Alan E. Rogers;B. Ronnang;J. Ryan;B. Schupler;D. Shaffer;I. Shapiro;N. Vandenberg;J. Webber;A. Whitney
通讯作者:
T. Clark;B. Corey;James Davis;G. Elgered;T. Herring;H. Hinteregger;C. Knight;J. Levine;G. Lundqvist;Chopo Ma;E. Nesman;R. Phillips;Alan E. Rogers;B. Ronnang;J. Ryan;B. Schupler;D. Shaffer;I. Shapiro;N. Vandenberg;J. Webber;A. Whitney
DOI:
10.1016/s0076-695x(08)60711-5
发表时间:
1976
期刊:
Methods in Experimental Physics
影响因子:
--
作者:
J. Moran
通讯作者:
J. Moran
DOI:
10.1109/tassp.1983.1164206
发表时间:
1983
期刊:
IEEE Transactions on Acoustics, Speech, and Signal Processing
影响因子:
--
作者:
K. Scarbrough;R. Tremblay;G. Carter
通讯作者:
K. Scarbrough;R. Tremblay;G. Carter
DOI:
10.1109/icassp.1983.1172261
发表时间:
1983-04
期刊:
--
影响因子:
--
作者:
G. Johnson;D. Ohlms;M. Hampton
通讯作者:
G. Johnson;D. Ohlms;M. Hampton