Showing posts with label laser. Show all posts
Showing posts with label laser. Show all posts

Wednesday, May 27, 2009

Space Debris

This conference has been generating a lot of news stories on the festering problem of debris in earth orbit generated by our efforts. It is obviously getting dangerous and something needs to be done to address the issue.

However, I think that we must wait until we have the capacity to put a very powerful energy source in orbit to operate a microwave laser similar to that been tested aboard a 747 against missiles. (earlier post)

Such a laser can be used to target debris and impart a small change in kinetic energy through a series of pulses that vaporise the surface. The only saving grace is a rapid firing cycle that allows a swift handling of the thousands of prospective targets, most of whom are quite small.

The larger items are all prospects for simple interception and direct disposal which is feasible today but rather unnecessary. They mostly degrade in their own good time and we can find them anyway. This problem is all about the small stuff that inevitably gets loose. There we really are beginning to dodge bullets.

Then we have even blown some of this stuff up and a lot of that is in more eccentric orbits and thus more likely to cause a problem. You wonder what they were thinking and are still thinking today when we have no way yet to mop up the mess.

Key findings from the Fifth European Conference on Space Debris

by Staff Writers

http://www.spacedaily.com/reports/Key_findings_From_The_Fifth_European_Conference_On_Space_Debris_999.html
Darmstadt, Germany (ESA) Apr 04, 2009

During the 5th European Conference on Space Debris, 30 March to 2 April 2009, held at the European Space Agency, Darmstadt, Germany, experts from a wide spectrum of disciplines communicated their research results through 100 oral presentations and more than 40 poster presentations.

The conference was attended by some 330 participants from 21 countries, making this the largest dedicated space debris conference in the world.

Key areas were measurements and debris environment characterisation, environment modelling and forecasting (including orbit prediction aspects), risk analysis for the in-orbit and re-entry mission phases, protection and shielding, debris mitigation and remediation, and debris policies and guidelines.

As a special topic, the surveillance and cataloguing component of Space Situational Awareness (SSA), was addressed.

Highlights and key findings

In his keynote address, Gerard Brachet, former chair of the UN Committee on the Peaceful Uses of Outer Space (UNCOPUOS), reviewed the status of debris environment characterisation and identified the need for concerted actions toward sustainable use of outer space.

A corresponding UN Scientific and Technical Sub-Committee (STSC) activity has recently been initiated. It will build upon past UN space debris activities, which led to a first set of UN space debris mitigation guidelines in 2007.

In the Measurement and Space Surveillance area, the airborne, multi-instrument re-entry observation campaign of ESA's Automated Transfer Vehicle (ATV), in September 2008, is expected to increase our understanding of re-entry and break-up physics, leading to more reliable risk estimates in the case of uncontrolled re-entries.

Moreover, the new US Space Surveillance Network S-band fence will further lower the size threshold of space objects that can be routinely tracked and catalogued, hence (among other achievements) also improving collision avoidance capabilities.

Besides, optical measurements have improved our knowledge of the debris population in high earth orbits, including GEO (Geostationary Orbit), and of high area-to-mass objects on eccentric orbits.

In addition, several beam-park experiments (mono- and bi-static), involving European radars and radio telescopes, provided debris data down to 1-cm sizes.

In the Modelling and Orbit Prediction area, the most recent NASA (ORDEM 2008) and ESA (MASTER 2009) models of the space debris environment were discussed, and long-term environment stability analyses were compared.

The orbit-related contributions addressed the stability of disposal orbits, particularly for navigation constellations, and they looked at ways of extracting orbit and orbit uncertainty information from optical and radar measurements, and from US Catalog data.

In the area of On-Orbit and Reentry Risk Analysis, the focus was on collision avoidance services and supporting risk analyses for LEO (Low Earth Orbit) and GEO (Geostationary Orbit) objects. Reentry risk assessments, based on a detailed simulation of the underlying break-up processes, was another focus of interest.

In the area of Mitigation, the current status of international, national, and agency-specific guidelines or requirements on space debris mitigation was described. It was noted that these can only be a first step toward maintaining a safe space debris environment.

Space debris remediation, i.e. active debris removal from orbit, was identified as the next necessary step. Several contributions addressed technical and operational aspects of implementing such measures.

In the area of Hypervelocity Impacts and Protection, the latest results were presented on accelerator technologies, debris shield optimisation and damage prediction tools. Examples of impacts on the International Space Station (ISS) highlighted the importance of protective measures.

In the area of Space Surveillance, European researchers presented their proposals for optical and radar sensors, and for data processing methods for a European Space Situational Awareness System (SSA).

They looked at expected detection, correlation and cataloguing performances. US and Russian surveillance experts provided some insight into their experience gained over some 50 years of service. Many participants encouraged international cooperation and/or coordination of surveillance activities.

With the high quality presentations by a truly international community of experts, the 5th European Conference on Space Debris provided a comprehensive snapshot of the current state of space debris research.

The aspect of space surveillance, which was for the first time included as a main theme, showed a high degree of commonality with several of the traditional topics of this conference. Such synergies should also be pursued in future events.

The 5th European Conference on Space Debris demosntrated a well-established, consolidated knowledge base on the understanding and protection of the current space debris environment. This consolidated knowledge has led to internationally accepted concepts of space debris mitigation.

Main conference finding

However, it is common understanding that mitigation alone cannot maintain a safe and stable debris environment in the long-term future. Active space debris remediation measures will need to be devised and implemented. This is the main message from this conference.

While such measures are technologically demanding and potentially costly, there is no alternative to protect space as a valuable resource for the operation of indispensable satellite infrastructures. Their direct costs and the costs of losing them will by far exceed the cost of remedial activities.

Monday, December 29, 2008

Crop Circle Fabrication and Update

This recent article is way too long to post directly, so I invite you to tackle it at your leisure. The www.cropcircleconnector.com has been the chronicler of the crop circle phenomena from early days. The most important development that has evolved over the past twenty years is the evolving complexity, size and apparent intellectual content of the images.

I was frustrated for years by this phenomenon. It went from images that might have a natural origin to images that clearly could not. Yet through all this little in the way of empirical methodology seemed to be applied to their study. By this I mean getting down on your knees and inspecting the ground grid square by grid square. No human made event could withstand such scrutiny.

Then about three years ago, a researcher did the obvious and reported that the clearly authentic images are formed with six inch pixels. That made it completely clear, at least to me. We already knew that microwave energy was involved to collapse the plant stems. Now we are describing action caused by a beam of microwave energy hitting the ground.

This means that a microwave laser is producing this effect at a distance while been controlled by a computer driven aiming device. That is the obvious mechanism. The crop circle history also conforms to the steady improvement in human computer graphic capabilities. I immediately dismissed the whole story as a typical top secret military research program aimed at mastering the art of microwave laser weaponry. Recall that microwave technology has been militarized from the beginning and that the only technology releases have been ovens and communications.

In short, I had a perfectly good human agency quite up to the task of annoying us with these damn pictures, while producing a wonderful smokescreen.

The alternative explanation of ET simply was not necessary. Except that recently the complexity, from a mathematical viewpoint, is becoming compelling. Although, I am still unconvinced. However, I am also very aware that all previous thresholds of credibility have been crossed.

This article is a good beginning in the understanding of the mathematics. Much is made of new geometric theorems, but that is not very convincing. Euclidean based geometric problems are potentially vast in number and for that reason not overly pursued and published. Maybe this will help restore the hobby to its importance in mathematics.

But you can see the effort this is beginning to entice. I do not see yet where we are going with it, and it would be very annoying to discover another mathematical hobbyist at work over at the defence department. Maybe one of you can do better.

In the meantime, this ninety page article covers the history and various interpretations the images have generated to this year. That every image seems to be linkable to past symbology that is in the record (or maybe not) is a clue as to the interests of the generating artists (or the interpreting artists) and is itself a clue that we are kidding ourselves. More importantly, the technology has made great strides.

http://www.cropcircleconnector.com/anasazi/WHAT%20DO%20MODERN%20CROP%20PICTURES%20MEAN.html

WHAT DO MODERN CROP PICTURES MEAN?
Table of Contents
I. A scientific overview for the end of 2008
II. Mayan calendars and Mayan binary codes
III. More clues of various kinds
IV. Jaime Maussan and the Quetzalcoatl hypothesis
V. Some crop pictures have predicted the future
VI. Quetzalcoatl, Jesus and the year 2012