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Space Technology

China to Deploy Secure GPS by 2010 217

hackingbear writes "Unsatisfied by the reliance on American GPS navigation systems and not feeling much security joining the European Galileo system, China will expand its 4-satellite Beidou navigation system to a full-fledged, competitive, and encrypted system by 2010."
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China to Deploy Secure GPS by 2010

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  • by Anonymous Coward
    and will Tibet be in the correct location?
  • Interference? (Score:2, Interesting)

    One of the big concerns about the Chinese system is interference with the US and European GPS systems, and up until now there haven't been any set specs to start a meaningful discussion over.
    • Re: (Score:2, Funny)

      by mk_is_here ( 912747 )

      One of the big concerns about the Chinese system is interference with the US and European GPS systems, and up until now there haven't been any set specs to start a meaningful discussion over.
      [Citation needed]
      • by stranger_to_himself ( 1132241 ) on Thursday May 08, 2008 @05:36AM (#23335360) Journal

        One of the big concerns about the Chinese system is interference with the US and European GPS systems, and up until now there haven't been any set specs to start a meaningful discussion over.
        [Citation needed]

        How can you expect anybody to cite the lack of published specs?

        Unless of course its in the Big Book of Unpublished Specifications, which causes any reader to disappear in a puff of paradoxical smoke.

        • Re: (Score:3, Informative)

          by DrLang21 ( 900992 )

          How can you expect anybody to cite the lack of published specs?
          I think that was the joke.
    • Re: (Score:2, Informative)

      One of the big concerns about the Chinese system is interference with the US and European GPS systems, and up until now there haven't been any set specs to start a meaningful discussion over.

      Considering the Chinese were either illegally given our technology by Democrats or outright stole it [house.gov] I think their specs will be kind of close to ours.
  • Mmmm. (Score:2, Insightful)

    Too bad most of the satellites will be knocked out of orbit by all the debris their last little stunt in orbit left behind.
    • Re: (Score:3, Informative)

      Silly me forgot the link........ http://www.space.com/news/070202_china_spacedebris.html [space.com]
    • Re: (Score:2, Informative)

      by IAN ( 30 )

      Too bad most of the satellites will be knocked out of orbit by all the debris their last little stunt in orbit left behind.
      Most unlikely, since most of the satellites will use the medium Earth orbit, probably ~20000 km, which is far, far above the debris field left by the ASAT shootdown. The rest of the satellites will be geostationary (per TFA), still farther away.
    • by XNormal ( 8617 )
      > Too bad most of the satellites will be knocked out of orbit by all the debris their last little stunt in orbit left behind.

      Nope.

      The navigation satellites are at medium earth orbit (MEO) of ~20000 kilometers and geosynchronous at ~36000. The antisatellite test left debris in relatively low earth orbit (LEO) around 800 kilometers. The debris from the test will not affect the navigation satellites.
  • Good (Score:3, Funny)

    by Anonymous Coward on Thursday May 08, 2008 @02:37AM (#23334668)
    And will this mean that my take-away will be delivered on time and, importantly, to the correct address? I hope so!
  • by Anonymous Coward on Thursday May 08, 2008 @02:43AM (#23334692)
    Great, now they can spread peace and harmony more precisely, +/- 1m.
    • Recent news: Tibetans attacked Chinese tractor near border. Tractor responded with rocket fire and flight away.
  • by NoobixCube ( 1133473 ) on Thursday May 08, 2008 @02:56AM (#23334752) Journal
    I have the feeling the expansion of this system has an ulterior motive. I'm sure they're right, from their point of view, about the other GPS networks. I don't doubt them. I do doubt their good intentions though. A new "feature" of their expanded GPS network will probably be to tell the police exactly where the user is. It might even end up mandatory. I know I probably sound a little extreme, and for all I know, I could be wrong. I'm just not very trusting of any government. The UK is becoming an Orwellian surveillance state, America is getting "Real ID" or something. I don't know much about it. Here in Australia, various government factions keep pushing for a national ID card, disguising it under various names to try and fool the sheep, or "voters", as we prefer to be known. I just wouldn't put it past a country that is known to heavily censor the internet and spy on citizens' internet use, to basically microchip everyone to know exactly where they are. Why stake out the house of a dissident, when they can track his movements and arrest everyone involved with them, without lifting a finger and exposing their domestic spies?
    • by Anonymous Coward on Thursday May 08, 2008 @03:19AM (#23334830)
      Look carefully at their network. If this was for policing, then the original 4 geo-sats would cover it. But they are building out a full 30+ system. It is not just GPS, but military communications. This is most likely not going to be used for policing, but truly for military use. And that is the problem. China is gearing up militarily. [google.com] Just in the last several years, they have been launching new attack subs and SSBNs at a rate of at least 1 / per year each. We have spoken about China's shoot down of their weather sats (which is different than our shooting down a crippled sat that was coming down). We have spoken about their using a ground based laser on a US sat. China is now gearing up faster in the military front faster than anybody has over the last 100 years. That includes Hitler's build up in 1934-46, and FDR's 2 year build-up. Add to that the amount of spying going on as well as China's trying hard to hide budgets.

      What we are looking at is that China is getting ready to attack, not defend.

      Russia and India are now cooperating closer than ever, even while India is pulling closer to UK and America. They are getting worried about China's intention. I suspect that Russia will realize soon exactly why America is pushing their anti missle system. It is not about Iran, or even Russia.
      • Re: (Score:3, Insightful)

        Comment removed based on user account deletion
        • Sorry, but you're a total idiot. China has never been an expansionist power. They only fill the land that has ever been China, such as Tibet. Korea is a totally different culture and has only ever been vassalized, not conquered. Would China want with broken-down North Korea anyway?
        • by gatzke ( 2977 )

          Interesting idea. Could a N Korea invasion by the Chinese precipitate a strike on S. Korea some way? They have been allies for decades...

          I would have guessed some sort of Taiwan move, but I think the China-Taiwan issue is calming down recently.
        • by piemcfly ( 1232770 ) on Thursday May 08, 2008 @09:10AM (#23337000)
          Ugh. How is this insightful?

          China threat theory is sooooo out of favor among people who know their stuff that it boggles my mind how the rest of the world (except for US army leadership of course, who just want more toys to play with) keeps nagging on about it .

          'Heping jueqi' is the 21st century mantra for the chinese. They don't want to fight any serious wars, and aren't going to be able to project global power in any serious way for quite a long time.

          China is a great power in name only, they are not willing and capable of acting like a great power yet. They're still on the edge of the world system in a lot of ways. What they want right now is to be accepted into it, and if anything, the west should accomodate them. You might want to read John Ikenberry's extremely insightful essay [foreignaffairs.org] in Foreign Affairs of Jan08.

          Also, they walk a razors edge in their national politics, balancing economic freedom and political dictatorship. Nobody can expect them to 'go western' all of a sudden. It'd destroy their nation as a unit. All our complaints about human rights violations, morally right as they may be, are trumped by their national survival. China is preoccupied by raising its living standard right now. Deng Xiaoping got something very right when he allowed for just economical freedom, but also gave China a huge national problem.

          All this crap about 'china's growing military' pails when compared to current US power. China is not 'getting ready to attack'. China is getting ready to be able to protect her trade-lanes in the east/south china sea. That may scare americans, who have regarded that little pond as their own back yard for a century, but it's only natural for a rapidly growing nation. Yes, China is indeed growing its army, but that does not mean they're pumping liquid oxygen into their DF-5 ICBM's just yet. Misinterpreting the goals of a rising power is the surest formula to kick off a war. As a Rising power, China is risk-averse and, for all intents and purposes, seems to have limited revisionist aims.

          The biggest threat of war with China comes from self-fulfilling prophecies about war.
          • Re: (Score:3, Interesting)

            by analog_line ( 465182 )
            I agree with the general thrust of what you're saying, but you're being as simplistic as the previous poster in a lot of ways.

            First off, US military power is at a seriously low ebb these days. We are locked into Iraq and Afganistan for the forseeable future. There's no way we could move equipment and material in a rapid manner from those theaters to a new one if another conflict came up, nor provide troops without a draft. It would have to be an EXTREMELY serious, direct threat to US or close allied soil
          • by Steve Hamlin ( 29353 ) on Thursday May 08, 2008 @12:21PM (#23339926) Homepage

            Excellent post! Informed, pragmatic rationalism based on facts - uncommon in /. discussions about international affairs.

            See also a very informative article from the Atlantic Monthly: How We Would Fight China [theatlantic.com] by Robert Kaplan, an experienced journalist covering U.S. foreign affairs and the military. Detailed description of China's current military, with short- and long-term views of their military growth.

            A tiny exceprt: (please keep in mind that Kaplan isn't advocating for confrontation, but doing a thorough analysis of what might happen if foolish politicians get us into such a mess).

            " At the moment the challenges posed by a rising China may seem slight, even nonexistent. The U.S. Navy's warships have a collective "full-load displacement" of 2.86 million tons; the rest of the world's warships combined add up to only 3.04 million tons. The Chinese navy's warships have a full-load displacement of only 263,064 tons. The United States deploys twenty-four of the world's thirty-four aircraft carriers; the Chinese deploy none (a principal reason why they couldn't mount a rescue effort after the tsunami)."

            "China has committed itself to significant military spending, but its navy and air force will not be able to match ours for some decades. The Chinese are therefore not going to do us the favor of engaging in conventional air and naval battles, like those fought in the Pacific during World War II...Instead the Chinese will approach us asymmetrically...But the Chinese are poised to show us the high end of the art. That is the threat."

            "There are many ways in which the Chinese could use their less advanced military to achieve a sort of political-strategic parity with us. According to one former submarine commander and naval strategist I talked to, the Chinese have been poring over every detail of our recent wars in the Balkans and the Persian Gulf, and they fully understand just how much our military power depends on naval projection--that is, on the ability of a carrier battle group to get within proximity of, say, Iraq, and fire a missile at a target deep inside the country. To adapt, the Chinese are putting their fiber-optic systems underground and moving defense capabilities deep into western China, out of naval missile range--all the while developing an offensive strategy based on missiles designed to be capable of striking that supreme icon of American wealth and power, the aircraft carrier. The effect of a single Chinese cruise missile's hitting a U.S. carrier, even if it did not sink the ship, would be politically and psychologically catastrophic, akin to al-Qaeda's attacks on the Twin Towers. China is focusing on missiles and submarines as a way to humiliate us in specific encounters. Their long-range-missile program should deeply concern U.S. policymakers."

            --- --- --- ---

            Also from the Atlantic Monthly:

            Superiority Complex - Why America's growing nuclear supremacy may make war with China more likely [theatlantic.com] Again, detailed anaylsis of possible flashpoints and the resulting warfare. Section title: "Strategic Implications of the Nuclear Imbalance"

      • Re: (Score:3, Informative)

        by malsdavis ( 542216 )
        "China is now gearing up faster in the military front faster than anybody has over the last 100 years. That includes Hitler's build up in 1934-46, and FDR's 2 year build-up"

        Huh? In the mid 1930's Germany was producing hundreds of attack subs a year, hundreds of aircraft a year and thousands of tanks! Unless China has hundreds of secret military factories, they are not even coming close to matching Nazi Germany's militarism.

        If you consider how old most of China's current military hardware is (nearly all thei
        • Re: (Score:3, Insightful)

          by jollyreaper ( 513215 )

          Huh? In the mid 1930's Germany was producing hundreds of attack subs a year, hundreds of aircraft a year and thousands of tanks! Unless China has hundreds of secret military factories, they are not even coming close to matching Nazi Germany's militarism.

          It's kind of hard to compare military power between the eras. A single boomer doesn't weigh as much as a battleship nor look as impressive but it can toss 200 warheads and put a serious hurting on any country out there. (let's leave aside the consideration of the weapon actually being used.) A single modern fighter can cover more territory and engage targets further away than any WWII prop-job. So yes, inflation-adjusted, the modern aircraft costs 50x more. Is it an effective bang for the buck? That's how

      • Just in the last several years, they have been launching new attack subs and SSBNs at a rate of at least 1 / per year each.
        1 attack sub/year for a country of 1.3 billion people.

        Somehow that doesn't concern me all that much.

        When you consider the scale of just how staggeringly huge China is (20% world population as opposed to 4.5% for the US), their military doesn't seem quite so massive.
      • by kabocox ( 199019 )
        Just in the last several years, they have been launching new attack subs and SSBNs at a rate of at least 1 / per year each.

        You call 12 a year, which would be about 60 over 5 years a massive buildup? Damn, I'd figure 1 a day or 10 a day a build up. This sounds like routine military upgrades to me. Face it China is now currently the other global super power. We don't buy our cheap stuff from Canada, Russia, or India; we buy it from China. We'll support them as long as they leave South Korea, Japan, and Taiwan
    • by jrumney ( 197329 ) on Thursday May 08, 2008 @03:59AM (#23334990)
      GPS is one way communication, it does not send anything back to the satellites. To do so would require either a very powerful transmitter on the ground device (say goodbye to GPS in your mobile and other handheld battery powered devices), or a very sensitive receiver on the satellite with the signal processing power to differentiate the weak signals of millions of devices from each other and from the general radio noise coming from earth.
    • Re: (Score:2, Informative)

      by dddno ( 743682 )

      A new "feature" of their expanded GPS network will probably be to tell the police exactly where the user is

      You wouldn't really need any changes to the GPS for that- the satellite has no knowledge about the position of anyone receiving its signal anyway; the positioning signal is one way. In theory, a receiver could of course send an ID and the location it computed from multiple satellites back to one of them- but you'd hardly use the GPS satellites for tracking millions of individual devices. Much more likely, it would work somewhat like the EU's Galileo extension to the COSPAS-SARSAT system. [europa.eu]

      But, constantly

    • A new "feature" of their expanded GPS network will probably be to tell the police exactly where the user is. It might even end up mandatory.

      In itself, GPS won't do that, because a GPS receiver is just that -- a receiver, with no backchannel. I suppose the Chinese could build a backchannel into their system (perhaps under the pretext of negotiating the encryption) but there would be bandwidth issues (not insurmountable) and the slightly more significant issue that the government would only know where the receiver was, not where its owner was. I'm about 15 miles from my GPS receiver as I type this...

  • by lusiphur69 ( 455824 ) on Thursday May 08, 2008 @03:00AM (#23334768) Homepage
    Quite obviously this is because in times of war, the Chinese could find themselves locked out of either the US or EU systems. If they are going to tightly integrate GPS capabilites into military units - a no brainer - they want to have a closed system that noone can pull the plug on come WW3.

    As my philsophical opponents say so often "This is'nt rocket science".

    • The US has been preparing for this phase a little longer than China though :)

      http://www.afspc.af.mil/units/ [af.mil]

    • by pembo13 ( 770295 )
      While I am not a big fan of senseless war, their logic on this move seems sound.
    • Re: (Score:3, Insightful)

      by eebra82 ( 907996 )

      [..] they want to have a closed system that noone can pull the plug on come WW3.
      Until you point your missiles at the satellites. No plug is unpluggable.
    • "Quite obviously this is because in times of war, the Chinese could find themselves locked out of either the US or EU systems."

      There are reasons the Chinese might want to do this other than for war purposes, i.e. that their prior experiences with Western powers have resulted in a situation where they don't trust us to keep our word to them about anything, just like we don't trust them to keep their word.

      Try putting the boot on the other foot for a moment and consider a situation where the Chinese had the fi
  • Questions... (Score:2, Insightful)

    Who says it should be global? As information given in the wikipage, the satellites are on the geostationary orbit. can't we have networks of different positioning system? such as global cell phone networks, satellite Tvs, phones, internet that we have today? if geostationary satellites can provide better and more focused service in that region why not use more of them to improve precision? and why don't we have GPS towers like cell phone towers that we have? why not integrate GPS capability into those cell
    • Re:Questions... (Score:5, Informative)

      by Charcharodon ( 611187 ) on Thursday May 08, 2008 @03:59AM (#23334992)
      Actually they do have several things like what you are talking about, the thing seems to be cost is why you don't see them in cell towers. They have to be very accurately surveyed to provide better accuracy than GPS.

      WAAS - wide area augmentation system begain deploying a few years back. It has 25 ground sations in the US that recieve the signal and then send corrected signals back up to the satellite.

      The next one, is called LAAS, local area augmentations system, like the WAAS but much more local. It is designed specifically for aviation and is only good in a 20 mile proximity to the airport. It's supposed to be a cheaper replacement for ILS systems.

      Take a look on wikipedia under WAAS GPS & LAAS GPS there are some pretty decent articles on them.

    • Its because having the GPS satellites moving is more accurate and more importantly, cheaper.
      You dont need anywhere near as many satellites.

      Again, radio beacons have the same problem.
      Whats cheaper? 30 or so satellites covering the entire globe or peppering radio towers *everywhere* (including the middle of oceans)?
    • by muffen ( 321442 )

      can't we have networks of different positioning system? such as global cell phone networks

      When I was on holiday in India a few years back, the mobile would say the streetname of the street I was on. Found this quite interesting. Later found out that taxi-companies sometimes use mobile networks to see where the cars are. So, it already (sort of) exists, although I am unsure how accurate it is.

      Then of course, if you'd like to launch missiles using mobile navigation, it may suck a bit if you loose recep

  • by Tomji ( 142759 ) on Thursday May 08, 2008 @03:41AM (#23334924)
    No way around it, too much military equipment needs this these days. No one in China doubts that the USA would shut them out of the GPS at the slightest confrontation and the EU is a weakling and would crawl under American pressure. Unfortunatly that will mean that soon India will need it's own system as well since they also don't trust the USA very much. (USA has been funding pakistan through all the wars they had)
    • Hell even the EU isn't happy with American lock in, and IRRC the UK is also not keen on GPS that's why were developing skynet (i mean FFS a defence network called skynet, what are they thinking!!!).

      Also GPS sort of sucks compared to what modern tech can do, no doubt the increase in competition will mean the US will improve their GPS too
  • Why not Galileo? (Score:2, Interesting)

    by Wiseman1024 ( 993899 )
    I can see why they won't trust the American system, but why not the nicer European system? Is there something in Galileo that won't fit their communist dictatorship agenda?

    This is yet another lame move from the Chinese government. Instead of trying to reduce their huge inequality, or at least improving the quality of life for the billion living in poverty, they waste their relatively modest budget duplicating efforts just because they want to play big, as if they were some sort of Europe or USA. The problem
    • Re: (Score:2, Interesting)

      by dddno ( 743682 )

      Is there something in Galileo that won't fit their communist dictatorship agenda?

      First and foremost, they want an independent system exclusively under their own control. They know that the EU will surrender the Galileo controls to the US whenever they demand it - there goes Galileo's sole big advantage. The sad story of how the EU bent US demands and crippled its system made that clear to the Chinese.

      • Well, that indeed sucks. Just read about that. Then the EU is also wasting their money - MY tax money, which angers me. I don't mind funding this at all, but I don't want to lick foreign powers' asses, much less the USA's, much less if it costs me money. In fact, the point of making Galileo was to be independent from the USA and not have to bend over to them anytime. The EU was very stupid and lost sight of Galileo's goal.
    • The US were given cutoff access to Galileo - that's why the Chinese are wary of it.
    • by Detritus ( 11846 )
      Peasants are expendable.
    • by Shivetya ( 243324 ) on Thursday May 08, 2008 @06:23AM (#23335562) Homepage Journal
      First, China is a very proud nation and as such will not allow itself to be dependent on any other nation for services it can provide itself. They also are trying to express themselves on the world stage as a world power and mostly do this by repeating the same technological achievements other countries of similar stature already have done. Its kind of like a rite of passage.

      As for the population, China really is two distinct countries when it comes to its people. Now I know you can divide up the population into various ethnic groups but it comes down to you are either part of the Communist system or your not. So you have a couple hundred million in the one camp, with all the benefits of modern life, and then the rest who are still essentially not much more progressed since the the beginning of the last century.

      The problem is, China really could not give a rats ass what you, I, or the world thinks. Any attempt to tell them and they take it as an insult. The big concerns going forward are not what happens to China's people but what China attempts with its neighbors. This makes the GPS development interesting in that it increases their threat capability. Considering the fact that its nearly a monthly exercise their threats against Taiwan take on even more seriousness with this expanded capability. This allows them to accurately deliver weapons to targets far beyond their borders. This means they can simply ignore the pleas of the world should they decide to finally address Taiwan in a military manner. It provides a good threat projection versus the US as well.

      We can hope they will use the technology to better the lives of their people but unless you part of the first group in China I doubt they can or want to. Simply put the numbers are too large and the territorial issues are extreme in many cases. Combine this with the fact many would just preferred to be left alone and its hard to imagine why the government would bother unless national interest were at stake.

      China doesn't want to play big, they already are. They simply want the respect they feel they are not getting. The Olympics were a gesture by some feel good misdirected people on the world stage made to China. Unfortunately China didn't care about all the supposed conditions these people attached, they saw it only as a means to elevate their status in the world and redirect some attention from the unsavory side of their activities. Unfortunately too many in the world are willing to go along. Unfortunately too many people like to vilify the US for things that in China get a pass. Perhaps its because at least with the US there is a chance of changing the behavior.

      My friend came back from China teaching English there for a few years, even with a native as a wife. Go figure, anyway what China has a problem with is that many of these highly educated young people don't want to stay. His view was that all this modern conveniences and such were like a bribe to keep the people the nation's leaders need to keep the country going. Basically buy the people off with shiny stuff.
    • I can see why they won't trust the American system, but why not the nicer European system? Is there something in Galileo that won't fit their communist dictatorship agenda?
      Which "they" are you talking about - the Chinese or the EU?
  • It wasn't clear from the bluargh, but encryption apparently means that there is a mode where the satellites encrypt the signals they send to the ground so that only those invited can use it. A bad thing, in other words.
    • Re:Encryption (Score:4, Insightful)

      by ledow ( 319597 ) on Thursday May 08, 2008 @05:08AM (#23335282) Homepage
      Like the US system. And the EU system. Both of which have provision for encrypted signals that only those with the key (i.e. the military) can decrypt, while providing less accurate data "unencrypted". Except that the US turned their encryption off a few years back, but neither the EU or the US have said that they wouldn't turn encryption on "in troubled times". The EU initially considered doing without this but it ended up getting included too in a roundabout way.

      Not so much "bad" as a waste of time. The unencrypted accuracy is still very useful for most purposes, and there are historical records of the US system being scuppered so that over certain parts of the globe at certain times, even the unencrypted signal was deliberately highly inaccurate but the military knew how to "compensate" for the bad data using a key. However, if China are doing this to stop the effects of a US/EU turnoff from affecting them, this is pretty much vital, I would say. The rest of the world's GPS has exactly the same features, so I don't see how China are doing anything "bad" by this. That's not to say that their overall motives are good, but no worse than the EU/US.
      • Like the US system. And the EU system.
        Oh, I didn't know there existed such a separation in Galileo. I thought it was completely open. In that case, they are all bad in my eyes.
      • Re:Encryption (Score:4, Informative)

        by dave420 ( 699308 ) on Thursday May 08, 2008 @06:44AM (#23335634)
        Nope. The US system has selective availability turned off, and all new US GPS satellites don't even have SA functionality, so they can't turn it back on later.
        • They meaning the enemy or even the US?
          if even the US cant turn them back on doesn't that turn your satellite into a very expensive piece of space junk? good thing that china can shoot it down for us then.
      • by Kokuyo ( 549451 )
        The question that needs to be answered is:

        Why do they want their own if it doesn't do anything the others don't?

        The question is simple: If you're using something that is owned and controlled by someone else and you plan on pissing them off, you need your own. And that is what makes this bad news.
        • Re: (Score:3, Insightful)

          by ledow ( 319597 )
          So the EU were planning on pissing off the US? It wouldn't surprise me, actually, but I don't think they are considering declaring war on the US just yet.

          Simple military tactics - make sure your weapons and systems are under your control. Make sure they are redundant enough to survive a war. Make sure your enemies can't interfere even via the intervention of other nations. Make sure that political decisions don't get your only source of GPS information turned off.

          I don't think that scaremongering over a
        • Yeah i switched to linux just because i planned on pissing MS off, maybe they just want theirs own so its theirs not ours?
      • Sorry to go all hippie on you, but in a time of war wouldn't it be better to give everybody highly accurate access to your GPS to reduce civilian casualties.
  • Inevitable (Score:3, Insightful)

    by MarkKnopfler ( 472229 ) on Thursday May 08, 2008 @07:30AM (#23335894)
    This was inevitable. I remember, about a year back, in India, over a beer, discussing the defense scenario with a colleague who was an engineer/researcher with the Indian Navy for about 20 years. His words -- "What we need is a secure GPS system soon. We all know the American version is civilian and of course they can shut it down whenever they want. It is a major desirable in your defense program." I think the Chinese too think the same way. They just came up with it. I would not be surprised if India announced the same within half a decade.
    It is what it is. A desirable in the military program. Period.
  • by peter303 ( 12292 ) on Thursday May 08, 2008 @02:23PM (#23341776)
    The Beidou system returns time after after a query from a terminal. They can only handle so many requests a minute. On the other hand US and Euro system continually broadcast time and location information.

Mediocrity finds safety in standardization. -- Frederick Crane

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