AND CHOSE INVENTION WAS.................... THE GPS

HISTORY 

In 1957, the Soviet Union launched the Sputnik satellite into space I, which was monitored by observing the Doppler shift of the signal transmitted. Due to

this fact, they began to believe that, similarly, the position of an observer may be established by studying the Doppler frequency of a signal transmitted by a

satellite whose orbit was accurately determined.The U.S. Navy quickly applied this technology to provide navigation systems for their fleets of observations of current and ac

curate positions. Thus arose the TRANSIT system, which became operational in 1964, and by 1967 was available also for commercial use.

Position updates, back then, were available every 40 minutes and had to remain almost static observer to obtain adequate information.

Later in that decade, and with the development of atomic clocks, we designed a constellation of satellites, each carrying one of these watches and being all synchronized based on a reference time.

In 1973 programs were combined Navy and Air Force of the United States (the latter consisting of a transmission technique which provided accurate data encoded using a modulated signal PRN code (Pseudo-Random Noise: Noise pseudo -random), in what became known as navigation technology program (navigation technology program), later renamed to NAVSTAR GPS.

Between 1978 and 1985 he developed and launched eleven experimental prototype NAVSTAR satellites, which were followed by generations of satellites, to complete the current constellation, which is said to "initial operational capability" in December 1993 and with "full operational capability "in April 1995.

 Evolution of GPS

The GPS is evolving into a more robust system (GPS III), with higher availability and reduces the complexity of GPS augmentations. Some of the planned improvements include:

   

Incorporation of a new signal in L2 for civilian use.
     Adding a third civil signal (L5): 1176.45 MHz
     Protection and availability of one of the two new signals for Security Services for Life (SOL).
     Improvement in the structure of signals.
     Increase in signal power (L5 have a     power level of -154 dB).
     Improved accuracy (1-5 m).
     Increase in the number of monitoring stations: 12 (twice)
     Allow better interoperability with Galileo L1 frequency.

My point of view

the gps is very important because it is a method to know first how this climate, if you lose one on a trip, in case you want to know how this traffic, to see some additional information from somewhere, it is important to use porqe an effective tool when you want to make long trips and not willing to get lost in the other place and other uses efficient