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
Tong Li
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhang Tianyi;Meng Qiao;Chen Congyan;Zheng Weimin;Liu Wei;Yu Quantao;Tong Li

文献摘要

参考文献

被引文献

相似文献

甚长基线干涉测量(VLBI)是射电天文学、大地测量学和深空探测的有力工具。干涉条纹的制作需要先验预测延迟模型,但在某些情况下很难得到。本文提出了一种有效的算法CAF-W算法,在没有先验预测延迟模型的情况下,在大搜索范围内从原始数据中搜索条纹。交叉模糊函数(CAF)用于在延迟-延迟速率平面上进行时频相关。利用小波提升算法消除干扰,增强CAF峰值,由峰值位置得到时延和时延率估计。采用非相干平均和滑动搜索窗技术,克服了VLBI观测中搜索范围大、信噪比低的缺点。CAF-W算法可以用快速算法执行,因此计算负担是负担得起的。该算法成功地从原始数据中提取了VLBI条纹,而不需要VLBI观测中的先验预测延迟模型。
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.
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
DOI: 10.1109/tgrs.1985.289433
发表时间: 1985-07
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