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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51475

Title: Applying Time-Frequency Distribution Function to DOA of Mobile Active Sensor
Authors: Shun-Hsyung Chang
Jun-Cheng Liu
Chih-Wei Chiu
Contributors: 國立臺灣海洋大學:電機工程學系
Keywords: direction of arrival
time-frequency distribution function
modified adaptive cone kernel
Date: 2001
Issue Date: 2018-11-30T06:49:32Z
Publisher: Journal of Marine Science and Technology
Abstract: ABSTRACT: Increasing the accuracy of time-frequency detection in engineering
is always the goal that scientists are striving to achieve, because
it is widely applied in the fields of Radar, Sonar, the exploration of
earthquake epicenter etc. The current high-resolution time-frequency
methods are mostly based on the structure of time-frequency distribution
function of Cohen Family. Time frequency distribution function
can trace the instantaneous frequency of nonstationary signal. This
paper combines the process principle of multi-aperture Radar and
Array signal and applies time-frequency distribution function in DOA
of active sensor devices. By decoding of physical characteristics from
the changes of frequency, which can be done by using the active
devices to detect the response signal of the target and the analyzing the
nonstationary changes of frequency caused by the delays of time and
phase, the related positions and contained angle of target and reference
can be found and practically applied to the target DOA of aircraft
and vehicle engineering. By doing that, the troublesome multidimensions
Fourier projection calculations, eigen factoring and Spectrum
scan can be avoided and reduces the huge amount of active
dynamic sensor devices required for vehicles, but not all of the
distribution functions can be used to analyze the multi-objects. For
example, Wigner distribution function is one of the case, because it
contains the high cross-terms and is easily to be interfered by noise.
In this paper, the application of a new time-frequency distribution
function MACK (Modified Adaptive Cone Kernel) is proposed. The
application general form is derived and proved, also the signals of
time-varying spectrum are decoded. MACK can eliminate all of the
cross-terms and the time-frequency analysis ability is high and uniform.
The simulation results showed that the MACK function is very
realistic and useful on aircraft navigation and vessel location.
Relation: 9(2) pp.161-166
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51475
Appears in Collections:[電機工程學系] 期刊論文

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