Pv
P. van Genderen
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7 records found
1
Introduction to the Special Section on Some Less-Well-Known Contributions to the Development of Radar
From its Early Conception Until Just After the Second World War
Journal article
(2016)
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Gaspare Galati, Piet van Genderen
The invention of radar is 112 years old. A continuing interest has been and is being addressed in the long history of radar, with many old as well as recent publications. However, historical data on radar research and development are spread over many archives in the many nations where the independent and secret development of military radars almost simultaneously started in the 1930s, leaving important material still to be analyzed in both national and private archives. Moreover, unreliable and biased documents exist on this sensitive topic, calling for a wise usage of the written material. As a result of recent and careful archive research (and a result of some personal interviews), done by leading radar experts from four diff erent nations, this special section presents numerous interesting, less-known (in some cases, unknown) elements concerning the development of radar before and during the Second World War (WW II) in France, Ukraine (and former USSR), South Africa, and Hungary.
...
The invention of radar is 112 years old. A continuing interest has been and is being addressed in the long history of radar, with many old as well as recent publications. However, historical data on radar research and development are spread over many archives in the many nations where the independent and secret development of military radars almost simultaneously started in the 1930s, leaving important material still to be analyzed in both national and private archives. Moreover, unreliable and biased documents exist on this sensitive topic, calling for a wise usage of the written material. As a result of recent and careful archive research (and a result of some personal interviews), done by leading radar experts from four diff erent nations, this special section presents numerous interesting, less-known (in some cases, unknown) elements concerning the development of radar before and during the Second World War (WW II) in France, Ukraine (and former USSR), South Africa, and Hungary.
Conference paper
(2014)
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Yves Blanchard, Piet van Genderen
The << Atlantic Wall >>, built by the German forces along the occupied coasts of Western Europa as a rampart to protect them against Allied landing attempts, included a powerful chain of anti-naval and anti-air detection devices, which may be seen as a kind of counterpart to the British Chain Home. But its structure was quite different, and probably was most efficient at the time it was built. Today, 70 years later, remains of this continental chain can still be seen in many places, especially in France. Their <;<; archaeological >> study may enlighten the war time archives and documents from both sides, to explain how it was built, how it worked, and evaluate its supposed efficiency. The paper describes also the progressive discovery of this chain by the allies, which lead them to conceive a lot of counter-measures, which made it quite inefficient during the crucial days of June 44 in Normandy.
...
The << Atlantic Wall >>, built by the German forces along the occupied coasts of Western Europa as a rampart to protect them against Allied landing attempts, included a powerful chain of anti-naval and anti-air detection devices, which may be seen as a kind of counterpart to the British Chain Home. But its structure was quite different, and probably was most efficient at the time it was built. Today, 70 years later, remains of this continental chain can still be seen in many places, especially in France. Their <;<; archaeological >> study may enlighten the war time archives and documents from both sides, to explain how it was built, how it worked, and evaluate its supposed efficiency. The paper describes also the progressive discovery of this chain by the allies, which lead them to conceive a lot of counter-measures, which made it quite inefficient during the crucial days of June 44 in Normandy.
History of radar
The need for further analysis and disclosure
Conference paper
(2014)
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Gaspare Galati, Piet van Genderen
Within the frame of the Eurad-2014 Special Session ≪110 years of radar developments in Europe after Hülsmeyer's Telemobiloskop≫ this introductory paper contains (i) a retrospective analysis of the present literature and of its missing elements and (ii) a kind of presentation of this Special Session and its rationale.
...
Within the frame of the Eurad-2014 Special Session ≪110 years of radar developments in Europe after Hülsmeyer's Telemobiloskop≫ this introductory paper contains (i) a retrospective analysis of the present literature and of its missing elements and (ii) a kind of presentation of this Special Session and its rationale.
The Cavity Magnetron
Not Just a British Invention [Historical Corner]
Journal article
(2013)
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Yves Blanchard, Gaspare Galati, Piet Van Genderen
It is a common belief by many people that the resonant-cavity magnetron was invented in February 1940 by Randall and Boot from Birmingham University. In reality, this is not the full story. Rather, it is a point of view mostly advocated by the winners of the Second World War, who gained a great benefit from this microwave power tube (thanks to a two-orders-of-magnitude increase of power) in the Battle of the Atlantic, in night bombing until the final collapse of the German Reich, and in many other operations. This paper discusses the contributions by other nations, mainly France, but also Germany, Japan, The Netherlands, the Czech Republic, the USSR, and even more, to the cavity magnetron and to its roots.
...
It is a common belief by many people that the resonant-cavity magnetron was invented in February 1940 by Randall and Boot from Birmingham University. In reality, this is not the full story. Rather, it is a point of view mostly advocated by the winners of the Second World War, who gained a great benefit from this microwave power tube (thanks to a two-orders-of-magnitude increase of power) in the Battle of the Atlantic, in night bombing until the final collapse of the German Reich, and in many other operations. This paper discusses the contributions by other nations, mainly France, but also Germany, Japan, The Netherlands, the Czech Republic, the USSR, and even more, to the cavity magnetron and to its roots.
Ground penetrating radars (GPRs) are used to detect surface laid or shallowly buried objects. They can work either in the time or frequency domains. This paper presents the performances of newly developed stepped frequency continuous wave ground penetrating radar operating from 400 MHz to 4845 MHz, to provide good penetration and high resolution, which works with parallel and sequential transmission. We show the advantage of using circularly polarized waves for reproducing the shape of the target. The paper regards system calibration, antenna footprint, and range and cross-range resolution. The experimental results refer to surface laid as well as shallowly buried metallic and dielectric objects and show the ability of the radar not only to detect but to exhibit the shape of the targets.
...
Ground penetrating radars (GPRs) are used to detect surface laid or shallowly buried objects. They can work either in the time or frequency domains. This paper presents the performances of newly developed stepped frequency continuous wave ground penetrating radar operating from 400 MHz to 4845 MHz, to provide good penetration and high resolution, which works with parallel and sequential transmission. We show the advantage of using circularly polarized waves for reproducing the shape of the target. The paper regards system calibration, antenna footprint, and range and cross-range resolution. The experimental results refer to surface laid as well as shallowly buried metallic and dielectric objects and show the ability of the radar not only to detect but to exhibit the shape of the targets.