GPS if you can not use the military code to crack the military GPS high-precision positioning?
Impossible。 Password more than 128 even if you use supercomputers to run N years
Military and civilian use different systems, frequency and M code, positioning can be passive, does not mean that can not be collected from the information collection and processing system monitoring. My teacher said, the U.S. military on the GPS Modernization Process of the first point is to ensure that the benefits and use the U.S. to better use, blocking the enemy in wartime. Therefore, the use of anti GPS from the modernization process in the development of related technologies. Can not even regular replacement of scrambling code.We can't rely on the enemy.
3, even if the crack, it is difficult to use in wartime. Because it is the United States led things, the initiative in the hands of others, you use it, it must be restricted by the war. So even if the crack, can only be kept secret, until the wartime to interfere with it.And usually if you use it, it is very easy to find us, the U.S. will adopt the new encryption method (change scrambling etc.), you have to break the results cast to waste.
1, since it is "secret" crack, even if the people's Liberation Army will tell you?2, this involves GPS channel coding problem (I just took a course last Saturday), and crack the password is completely different concepts of the two. You confuse this crack with the password. It is a very complicated process to encrypt the spread spectrum codes of military channels. I learned one semester is not fully understood... Is spreading code added scrambling encryption and interference technology etc.. And the channel cycle is at least a few days, to try to crack do not want to think.
