The USA have for a long time been trying to track missiles after the main engine has burned out. The recent rise of manoeuvrable hypersonic gliders and cruise missiles has made this need more pressing, since they fly very low compared to ballistic missiles, and consequently they are mostly below the radar horizon. China and… Continue reading The American proliferated LEO architecture
I recently wrote about the TJS-4 satellite, which the Chinese put into geostationary orbit. Based on the picture released during launch, I concluded it was a signal intelligence satellite, capable of collecting signals of "250MHz to 1.5GHz of frequency. It is even possible that smaller elements, not visible on the image, allow the satellite to… Continue reading TJS-4 antenna design documents uncovered
This article initially appeared on eastpendulum.com, a French-language blog about the Chinese military and aerospace industry On October 17th, 2019, China launched the TJS-4 satellite from the Xichang Space Center. It was carried towards geostationary orbit by a Long March 3B rocket. However, contrary to the civilian communication satellites which are often launched to this… Continue reading TJS-4, the ears of Beijing
This article initially appeared on eastpendulum.com, a French-language blog about the Chinese military and aerospace industry A few years ago, I wrote about the Yaogan-30 constellation, which is made out of Chinese military satellites in Low Earth Orbit. By then, it had two groups of three satellites each, with the second group still having to… Continue reading Some news on the Yaogan-30 constellation
Following last year's announcement by the minister of the Armed Forces of changes in the French space defense strategy, the different options have been studied and the decisions taken by the President of the French Republic. The minister has disclosed some of the contents of this new policy in a speech on July 25, 2019.… Continue reading France’s new space defense strategy
With the new French space policy to be announced in a few months, and likely including a heavy Space Situational Awareness (SSA) emphasis, a few companies were presenting their solutions at the 2019 Paris Airshow: Sodern is working with cubesat builder Hemeria and electronics expert CS on Hirondelles, a constellation of cubesats to do satellite-to-satellite… Continue reading Space Situational Awareness news from the Paris Airshow
Persistent observation, a persistent problem For all the improvements in spatial and spectral resolution, agility and accuracy, satellites suffer from one serious drawback: they have to follow the laws of orbital mechanics and keep moving around the Earth. This means they cannot hang around an interesting location, to keep a persistent watch on it, except… Continue reading High-altitude Pseudosatellites, the future of Earth observation?