The American GPS receivers are indeed only receivers. But the flaw in your thinking here is that the American way is the ONLY way. We never said it is.
You are telling me there is a handshake for GPS?
The transmitter knows there is a receiver??
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The American GPS receivers are indeed only receivers. But the flaw in your thinking here is that the American way is the ONLY way. We never said it is.
Not for the American GPS. But apparently not too many people, including the Chinese, know the truth about the Beidou system, so here goes...You are telling me there is a handshake for GPS?
The transmitter knows there is a receiver??
For Beidou 1, it is the ground controller that tells the receiver/requester its location. Not that the receiver calculates its own positions from triangulation of detected satellites.BeiDou-1 requires two-way transmissions between the user and the central control station via the satellite. Firstly, the central control station sends inquiry signals to the users via two satellites. When the user terminal received the signal from one satellite, it sends responding signal back to both satellites. The central station receives the responding signals sent by the user from two satellites, and calculates the users 2D position based on the time difference between the two signals. This position is then compared with the digital territorial map stored in the database to get the 3D position data, which is then sent back to the user via satellites using encrypted communications
The new system under development will be a constellation of 35 satellites, which include 5 geostationary orbit (GEO) satellites, 3 IGSO (Inclined Geosynchronous Orbit), and 27 MEO (Medium Earth Orbit) satellites, that will offer complete coverage of the globe. The BeiDou-2 system will allow a ground receiver to calculate its position by measuring the distance between itself and three or more satellites in view, in analogy to the method of signal reception practised by the GPS and GLONASS constellations.
Beidou 2 will supposedly allow receivers to be receivers instead of requesters but by now, privacy activists already have plenty of doubts on the honesty of the Chinese government.3. Because the satellite is only a transponder, the navigation signal relies on the ground station. If anything happens to the ground station or the uplink, the satellite loses its navigation function. Compared with the other navigation satellite systems, therefore, CAPS is more vulnerable.
originally posted by gambitThe reality is that while the Beidou system has some advantages, those advantages belongs in the logistical, not the technical, realm,
The car is not driving, YOU are. You are talking as if no one else here uses satellite assisted location/driving except for you. What a feeble attempt at defending the Beidou system.
Easy...
The Beidou system is only 1/2 as satellite assisted navigation as the American GPS. See if you can figure out what that mean...
Not for the American GPS. But apparently not too many people, including the Chinese, know the truth about the Beidou system, so here goes...
The Beidou as a satellite assisted navigation system with its 'Big Brother' aspect have been known for a long time but the Chinese government tries very hard to suppress that fact.
For the Beidou system, each satellite is only a relay of queries and responses...
http://events.eoportal.org/presentations/10001572/10001573.html
For Beidou 1, it is the ground controller that tells the receiver/requester its location. Not that the receiver calculates its own positions from triangulation of detected satellites.
CAPS
Beidou 2 will supposedly allow receivers to be receivers instead of requesters but by now, privacy activists already have plenty of doubts on the honesty of the Chinese government.
Sure as the sky is blue Sherlock you ain't. You talk as if YOU are the only one who know how to use the GPS. In Vegas, there are plenty of roads close enough to each other that will throw any civilian GPS off that will require the driver to pay attention to his driving regardless of what his GPS device indicate, whether it be 20 meters or 10 meters accurate.no sh1t Sherlock, i am the driver, how does that change anything? if i dont know the neighborhood/route how would i know which exit/turn to take if the GPS don't tell me. you like looking at the map thats your fetish not mine.
Dang...Schooled by an American and from an 'inferior' Asian at that.okay so the chinese system requires the gps receiver to transmit as well, thats a disadvantage yes(battery comsumption and such).
You gotta be freaking kidding me, jack...!!!you have yet to tell me what about my daily movements in my car that the chinese government would find so interesting not to mention there is no name/ID attached to such a GPS device, it could be anyone using the device
Feeble? Is the satellite phone feeble?How will the very feeble signal from a Beidou device transmit back to the satellite without very strong degradation? A receiver only mode is much easier to build.
Beidou 2 will supposedly allow receivers to be receivers instead of requesters but by now, privacy activists already have plenty of doubts on the honesty of the Chinese government.
The only way Beidou 2 will be completely trusted is when the system is reviewed and proven to be 100% passive by credible third party and you can bet your life that IEEE or EDN or the likes will be all over the system. I trust them more than I trust the Chinese government. I have no problems using Beidou at that time. Bi-directional governmental dependency satellite navigation system sucks.So you do know the difference between Beidou-1 and Beidou-2, right? You just keep skeptical that Beidou-2 terminal (without Beidou-1 back compatibility)may not be a truly passive client as the China government claim. Well, you can build your own Beidou-2 navigator from scratches (IC, PCB, antenna etc.), using interface control files released by China government. You can make sure nothing will be transmitted.
Actually Beidou will not sell anything but IC design license. Everything commercially available to you is manufactured by 3rd party companies. Conspiracy theory sucks.
To the public, if you value your privacy, DO NOT use Beidou.
The only way Beidou 2 will be completely trusted is when the system is reviewed and proven to be 100% passive by credible third party and you can bet your life that IEEE or EDN or the likes will be all over the system. I trust them more than I trust the Chinese government. I have no problems using Beidou at that time. Bi-directional governmental dependency satellite navigation system sucks.
To the public, if you value your privacy, DO NOT use mobile phones. turn them off (and remember to REMOVE their batteries) now!
Sure as the sky is blue Sherlock you ain't. You talk as if YOU are the only one who know how to use the GPS. In Vegas, there are plenty of roads close enough to each other that will throw any civilian GPS off that will require the driver to pay attention to his driving regardless of what his GPS device indicate, whether it be 20 meters or 10 meters accurate.
Dang...Schooled by an American and from an 'inferior' Asian at that.
You gotta be freaking kidding me, jack...!!!
WHEN YOU HAVE A TRANSPONDER AND/OR RELAY DEVICE THAT MUST MANAGE MULTIPLE CLIENTS IN A TWO-WAY COMMUNICATION PROTOCOL, YOU MUST HAVE A WAY OF DISCRIMINATION BETWEEN CLIENTS, AND WHAT ELSE BUT CLIENTS HAVE THEIR OWN UNIQUE IDS?
Yup...Sure as the sky is blue Sherlock you ain't. It does not matter if it is the political dissent who drives his car or loaned it to the his neighbor. What matter is that the Chinese government is able to keep track of A CAR. Sooner or later the political dissent will drive it and government agents will be able to track his movements to other political dissidents. Get it now ?
Feeble? Is the satellite phone feeble?
This tell me right of the bat, right from the git-go, that you have never used a GPS device in an OFF-ROAD environment, that you have never used it when snow covered the terrain for as far as the eyes can see for kilometers, and that you have never used it off shore when land is out of sight.i dont think you understand what "schooled" means
of course we pay attention to the road but LIKE i alrady said, if you dont know the area and the GPS thinks your on a different road its not gonna give you the correct instructions hence you may take a wroing turn until the GPS corrects itself, do you understand?
It is not YOU but the device. A satellite assisted navigation device is not something you buy and discard the next day, next week, or even within the next 5 yrs. You buy it and as long as it serves you with reasonable reliability, you will keep it for as long as its features continues to serve your needs. How long you have the watch on your left wrist?AND what? when i bought the GPS i dont need an ID to buy it, i didnt need to register the chip client ID to my name.
i sold my GPS on ebay, hey look, no way of knowing if its still me using it.
The issue is about governmental knowledge and tracking of your activities and satellite assisted navigation is the method in discussion. In the US, we already have issues with 'Big Brother'. But here is where your hypocrisy shines: You are trying to defend the Chinese government's ways of keeping tabs on the people but if the US government does the same things, you would be crying bloody murder.oh noes!!! like others have already said YOU are so concerned about this? better stop using the internet, better stop using your cell phone(and regular phone), hell please go dig a hole in the woods , apperently thats the only way you wanna live.
HQ 9 has limited anti ballistic missile capability unlike S 400 so what's the point of buying S400 for just comparing what HQ9 is not