Tag Archives: IRNSS

When China Attacks?


SpaceWar! screenshot courtesy of MIT through Wikipedia.

It must have been a slow news week last week, because this story gained traction: Space warfare with Russia and China? Pentagon urged to prepare for itIn the story, an unlikely scenario unfolds where China attacks U.S. navigation satellites, the U.S. suddenly becomes helpless, and is at the mercy of the “Red Menace.” My response: really??? Is it really that easy?

First, let’s just look at the numbers. The current number of operational GPS satellites the U.S. Air Force is operating is 31. They have an advertised requirement of 24 satellites in operations (Where are these numbers coming from? Why GPS.gov, of course.). This doesn’t include the number of older backup satellites. So, if China wanted to cripple GPS, they’d have to take the constellation below the 24 required. That’s a lot of anti-satellite missiles. This being space, though, it’s not that simple as the scenario suggests: GPS satellites move.

A GPS satellite orbits in what is known as a medium Earth orbit (MEO), which is about 12,500 miles in altitude. A GPS satellite circles the Earth every 12 hours, which means it is occasionally in view of China’s landmass or the contested ocean areas for perhaps 3 to 5 hours of one orbit. So if China were to take out 8 GPS satellites with missiles, they’d have to be ready to take out more a few hours later. Is this possible? Let’s say it is. The media is quick to talk about earlier anti-missile tests the Chinese military conducted, with the 2007 test creating A LOT of debris in space. Which gets to the next point.

China is launching its own GPS-type satellites into orbit, called BeiDou. At my last count, they have about 20 of their own, and aiming to eventually have over 30 in orbit as well. These BeiDou satellites are in different orbits, with a majority, I think, in MEO. This means there’s the possibility of China shooting themselves in the foot if they shot enemy satellites in orbits of similar altitudes, which might then litter debris in some of their BeiDou satellites orbits. But space is a big place, so maybe not.

Keep in mind this scenario is only for positioning, navigation, and timing (PNT) satellites, like GPS. Adversaries would have to launch a lot more to blind the U.S., especially when you consider there are commercial companies like Planet Labs with over 50 Earth observation satellites in low Earth orbit (they launched over 100 in the past two years). Are they as capable or robust as a DigitalGlobe WorldView, or a government-operated imagery satellite? Probably not. But they would be good enough for government work in case those bigger, juicier, expensive targets were taken out.

Back to GPS. There are more players in the PNT market than GPS and BeiDou. Russia has their GLONASS constellation, with over 20 satellites in orbit. The Europeans have Galileo, which is now quickly building up. The Indians are putting up their own regional satellite navigation system and are expecting to complete it this year. Each one of these PNT operators might have something to say about China launching missiles against U.S. GPS satellites. And if you don’t think China isn’t worried about India, you haven’t been paying attention.

A simpler, cheaper, and possibly more effective way to accomplish this is jamming. I’m ignorant of the power requirements to do this, but I understand the power used in the GPS signal is low, which means a bigger jammer could make sure no GPS signals get through to a particular area. And jamming could theoretically cover a particular area for longer than 3-5 hours. It doesn’t have to be expensive. It doesn’t even need to have something shot into space.

The U.S. uses drones, and China does, too. An inexpensive, high-altitude drone, or a fleet of them, could deny GPS signals coming in. Imagine how frustrating it would be for the U.S. Navy to expend million-dollar missiles on drones costing thousands of dollars. Imagine how much more frustrating it would be to then see a new inexpensive drone take the place of the one shot down. If space must be involved, cubesats might be able to do the trick, although China would need to put quite a few in orbit to be effective. Oh yeah, wait–China can do that: http://www.nasaspaceflight.com/2015/09/china-debut-launch-long-march-6/.

So, this kind of wargaming is fun. But let’s get back to the point, which is, sure, the U.S. military relies on space assets to conduct missions. But its assets, while seemingly vulnerable, aren’t as easy to get to as the article paints them. And the act of destroying satellites in orbit, while spectacular, does not help ANY space faring nation in the long run (unless they’ve developed a way to clean up the mess). It’s almost as if an attack on one is an attack on all.

And I mean ALL. If you have a smartphone, especially one bought within the past few years, you have GPS AND GLONASS receivers built right in to the brains of the phone. Let’s see, what apps use GPS? Uber, Yelp, Waze, and Google Maps for starters. Do you think citizens in China, Russia, India, or Europe use similar apps and tech on their phones? They’d be crazy not to.

Is the article’s scenario possible? Sure. Just like nuclear Armageddon is possible. Conflicts are always possible, especially when you have nations like China showing off shiny new muscles like a misguided gym-bro during Spring Break in Daytona, and the U.S. acting like the retired old man yelling at China to stay off of his lawn. But how likely is a conflict? There are cheaper, maybe even more effective ways to cripple a military’s use of satellite services than shooting them down. It’s our politicians job not to let it get that far.


India Did WHAT??!

The Geosynchronous Launch Vehicle Mark III in action. Image from the ISRO.

What if you did something that was awesome, a first for you and your country, and the world just yawned? Can you imagine how irritating that would be? Especially if your accomplishment was nearly as important as certain other accomplishments that occurred weeks earlier? Imagine India being in that awkward position and the something significant they accomplished was a capsule re-entry test.

Yes, India tested a crew capsule last week. And barely anyone seemed to mention it. Compare this with the SLS/Orion hoo-rah-ing. Perhaps India’s focus is more on development than PR? (Doubtful, really. Most big organizations pursue PR like a lawyer chasing an ambulance.)

Last Friday, I happened upon an article in the Bangalore Mirror about India’s latest launch of a very big rocket–the Launch Vehicle Mark III (LVM3). On December 18, the LVM3 was finally successfully launched into the skies. More importantly, it carried a payload called the Crew Module Atmospheric Re-entry Experiment (CARE). The whole idea of the launch was to test a few things, such as the LVM3 actually working as it should while pushing through the Earth’s atmosphere into space and that it was going in the direction it was supposed to go. CARE was another experiment, which really was designed to allow the Indians to understand the re-entry characteristics of the module itself (pictured below).

A lot of space objects floating in the oceans lately… Image from the ISRO.

So, again, the Indians are testing a crew capsule, and this time they dropped it from the LVM3 about 126 km (nearly 80 miles) above the Earth. According to the Indian Space Research Organisation (ISRO), the crew module weighs 3775 kg (a little over 4 tons), which is just shy of the new LVM3’s Geosynchronous Transfer Orbit (GTO) payload weight limit of 4,000 kg. The re-entry vehicle/crew module came back to Earth safely, using parachutes near the end of its descent. It landed in the Bay of Bengal and was recovered. The ISRO is considering the test of the rocket and the CARE mission a success.

India’s been rather busy with space this year. There’s the BIG mission, the Mars Orbiter Mission, which is now orbiting Mars and twittering pictures back to us (although it’s been fairly quiet lately). India is also halfway towards getting its own positioning, navigation, and timing satellite constellation, the IRNSS (Indian Regional Navigation Satellite System), in orbit. Now India caps it all off, literally, with a successful crew capsule test AND gaining the ability to lift heavier satellite payloads in orbit.

And who were the idiots saying this was a bad year for space? The glass is halfway full, people…

Update:  At the risk of turning this into an echo chamber, one of the people who liked this post actually has a very nice run-down of their watching the launch 11 kilometers away from the Satish Dhawan Space Center. It’s very short, but you can read about it right here: http://verseherder.wordpress.com/2014/12/20/a-concert-with-satellites-for-drummers/