Social Media Sidebar

Announcement

Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

'By far the greatest danger of Artificial Intelligence is that people conclude too early that they understand it'

 

Eliezer Yudkowsky

Planetary Resources For High Resolution Imaging

RATE THIS! +0
Posted in Science on 26th Apr, 2012 11:12 PM by AlexMuller

Planetary Resources will be putting up hundreds of inexpensive space telescopes with 9 inch mirrors, 2 meter resolution and sub-arcsecond pointing. The passive constellation method for boosting image resolution could achieve centimeter resolution. When Planetary Resources adds some fine station keeping capabilites, they will be able to create massive space telescope interferometers. They will add some starshade satellites and be able to image exoplanets.

 

Efficient, Passively Orbiting Constellations for High Resolution Imaging of Geosynchronous Objects

 

Over the past several years, much progress has been made in the development of the Intensity Correlation Imaging approach to ultra-fine resolution imaging. In this paper, we consider the design of a LEO-based observatory of small telescopes using the Intensity Correlation Imaging technology to achieve 1 centimeter resolution imaging of objects in geosynchronous orbit. We formulate the system Modulation Transfer Function (MTF) and then seek to optimize u-v plane coverage by the design of passive, LEO orbits. An adaptive random search technique is used to find constellation designs that offer twice the rate of u-v coverage as earlier results.

 

Within the context of Intensity Correlation Imaging based on the Brown-Twiss effect, we considered the design of a LEO-based observatory of small telescopes capable of 1 cm resolution imaging of objects in geosynchronous orbit. We formulated the effective system Modulation Transfer Function (MTF) and then sought to optimize u-v plane coverage by the design of passive, LEO orbits. An adaptive random search (ARS) technique was used to find constellation designs that offer twice the rate of u-v coverage as earlier results. The ARS algorithm proved to be an effective approach to obtaining suboptimal but greatly improved solutions to this complex, non-convex optimization problem. This method also offers the flexibility to incorporate additional constraints, such as minimum inter-satellite approach distance. Such extensions are the object of on-going work.

 

Calculation of Signal-to-Noise Ratio for Image Formation Using Multispectral Intensity Correlation (14 pages)

 

In previous work, we explored the possibility of using intensity correlation techniques, based upon the Hanbury Brown-Twiss effect to perform fine resolution imaging in the service of exoplanet astronomy. Here we consider a multi-spectral variant of the Hanbury Brown-Twiss technique. At each of a number of independent, light-gathering telescopes photodetection data encompassing each of a set of frequency channels are obtained and then are communicated to some convenient computational station. At the computational station, the correlations among the photodetections in each of the frequency bands are time averaged and then further averaged over the various frequency channels to arrive at measurements of the mutual coherence magnitude for each pair of telescopes. From these statistics, imaging data are, in turn, computed via phase retrieval techniques. Here, within a modern quantum optics framework, we examine the signal-to-noise characteristics of the coherence estimates obtained in this way under a variety of non-ideal conditions. We provide step-by-step derivations of the statistical quantities needed in a largely self-contained treatment. In particular, we examine the effects of partial coherence on a scene typical of exoplanet imaging and show how partial coherence can be used to greatly attenuate the parent star. We find that the multispectral version of intensity interferometry greatly improves the signal-to-noise ratio in general and dramatically so for exoplanet detection. The results also extend the analysis of signal-to-noise to a wider variety of practical conditions and provide the basis for multispectral intensity correlation imaging system design.

 



Read original article » Back to category

Comments



 

Recent headlines

  • Posted in Hardware on 2017-03-29 09:24:33
    ExoMars: Mars Rover scientists to study Mawrth Vallis.....read more
    Posted in Software on 2017-03-29 09:20:25
    AI to dominate banking, says report..read more
    Posted in Business on 2017-03-29 09:15:30
    Trump signs order undoing Obama climate change policies..read more
    Posted in Hardware on 2017-03-29 09:08:41
    SpaceX launch of private citizens on a lunar orbiting.....read more
    Posted in Business on 2017-03-28 14:55:07
    Bots shift towards AI and garner $24 billion of investment..read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Intensive medical treatment can reverse type 2 diabetes..read more
    Posted by AlexMuller
    Daily consumption of tea protects the elderly from cognitive.....read more
    Posted by AlexMuller
    New analysis method of metabolites accurately predicts whether.....read more
    Posted by AlexMuller
    Unproven stem cell 'therapy' blinds three patients at Florida.....read more
    Posted by AlexMuller
    Indigenous South American group has healthiest arteries of all.....read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me