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Baldwin provides the code and explains the requirements for using spectral analysis to resolve spectral peaks for pulses containing closely spaced truncated sinusoids.

Revised: Fri Oct 16 23:18:32 CDT 2015

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Table of contents


The how and the why of spectral analysis

A previous module titled Fun with Java, How and Why Spectral Analysis Works explained some of thefundamentals regarding spectral analysis. An understanding of that module is a prerequisite to an understanding of this module.

Another previous module titled Spectrum Analysis using Java, Sampling Frequency, Folding Frequency, and the FFT Algorithm presented and explained several Java programs for doing spectral analysis. In that module, I used a DFT program to illustrate several aspects ofspectral analysis that center around the sampling frequency and the Nyquist folding frequency.

I also used and briefly explained two different plotting programs that were originally explained in the earlier module titled Plotting Engineering and Scientific Data using Java .

An understanding of the module titled Spectrum Analysis using Java, Sampling Frequency, Folding Frequency, and the FFT Algorithm is also a prerequisite to an understanding of this module.

Frequency resolution versus data length

In this module I will use similar programs to explain and illustrate the manner in which spectral frequency resolution behaves with respect to datalength.

A hypothetical situation

Consider a hypothetical situation in which you are performing spectral analysis on underwater acoustic signals in an attempt to identify enemysubmarines.

You are aware that the enemy submarine contains a device that operates occasionally in short bursts. You are also aware that this device contains tworotating machines that rotate at almost but not quite the same speed.

During an operating burst of the device, each of the two machines contained in the device will emit acoustic energy that may appear as a peak in yourspectral analysis output. (Note that I said, "may appear" and did not say, "will appear.") If you can identify the two peaks, you can conclusively identify the acoustic source as an enemy submarine.

The big question

How long must the operating bursts of this device be in order for you to resolve the peaks and identify the enemy submarine under ideal conditions? Thatis the question that I will attempt to answer in this module by teaching you about the relationship between frequency resolution and data length.

Questions & Answers

what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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