The Global Positioning System (GPS) was originally developed by the US Military who launched satellites (the first satellite was launched in 1978) into orbit. The system consists of a network of between 24 and 32 satellites orbiting the earth at about 7000 mph, in a precise manner, two times every day.
In the early days only the military could track the signals but in the 1980's it was opened up to the general public.
Before we get into the specifics it is important to realize that the use of the satellite network is free, there is no subscription required.
The other benefit is the system is essentially unaffected by weather and it is accurate anywhere in the world. Some might recall the Loran system which was popular with boaters before GPS became popular.
Loran was capable of providing a very accurate position but only in limited areas where the transmission of signals was sufficient and provided the weather was not adverse.
GPS transmission satellites orbit the earth in a very precise and constant manner. As they orbit 12,000 miles above, they transmit radio signals 24 hours a day, every day. The receivers we use simply receive the transmitted signals and compare the time the signal was transmitted against the time it was received. Knowing the signals travel at a fixed rate of speed makes it easy to calculate how far the satellite and the receiver are from each other.
If this process were done with only one satellite the result would not be useful for us since it would only indicate a possible arc of a position. To provide accuracy the receiver has to receive signals from a minimum of 3 satellites.
In actual use, the receivers typically track the signals from many more satellites. In order to provide data like speed, direction, distance traveled, etc. the receiver repeats the position calculation on a continual basis and thus updates the position and other data. The signal transmitted includes the satellites ID, the satellites position at any given time and the date and time.
Accuracy of the receivers has improved with technology advances to an average of about 15 meters. In real practice it is common to see accuracy within a meter or two, at least at times.
When GPS was opened up for public use the signal was intentionally degraded by the Government which was referred to as Selective Availability (SA). SA has been discontinued so civilians now enjoy full accuracy of the system.
Technology referred to as Wide Area Augmentation System (WAAS) available with some receivers improves accuracy to about 5 meters. Receivers equipped with Differential technology apply corrections to the data based on other known references.
The end result is accuracy and functionality of GPS receivers to the point we all can rely upon. As a result we now see and enjoy GPS watches, auto and boat GPS navigation systems, GPS cell phones.
Everyone loves to get the most for their money. Its tough enough to save money now with the high cost of living, therefore we are becoming more conscious of what we are getting for our dollar. This is no different when it comes to our grocery shopping. We spend time looking for high quality foods at bargain prices. So if we are going to this much work then why not get the most out of what it has to offer. I mean we eat for two reasons, one because we have to in order to live, and the other because we like food. let's go on the same travel as our solid food does, which is through the digestive system, and see where we re losing the best it has to provide us ,and what we can do to make the most for our money. In order for our body to utilise what we consume it must be broken down into small molecules so the cells can apply it to offer energy. This is the job of the digestive system. This begins the moment you put food in your mouth. Do your part - by chewing your food thoroughly, you take those few excess seconds to let the saliva do its task. Following stop is the stomach after the food goes down through the throat. Three things are starting to take place here. First the food will be stored here while it goes through numerous processes. Secondly the stomach will churn the solid food, liquids and digestive juices entirely together, And So thirdly it will slowly exhausted these entirely mixed contents into the small intestine. Do your part - have your time feeding so you are not overloading the stomach. Permit it some room to do it's work. There are components that determine how the stomach discharges, 1 being the sorts of foods it has to break down, and the second being the degree of muscle processes that is unavoidable. The pancreas, liver and intestine entirely cater juices to help the process that is carried out in the digestive system. Moving on from the stomach, once it has be broken down into nutrients that can be sucked, it at present has attained the digestive stage. Here the good stuff is absorbed through the intestines ,so it carries on it's direction to do its job with the different organs. The remaining is the waste. This is driven down into the colon where it waits to depart from the body through bowel movements. Do your part,nobody wants waste sitting around within of them, so ensure your bowels are operating the right way. This is just a very casual explanation as to what goes on with all that good food you gave so very much cash for. By following these simple guidelines you are more brilliant to get the most for your money. As we were going on on our journeying, we in short mentioned several other organs that have a essential responsibility in the digestive system. By preparing yourself in the fundamentals of these organs and what holds them in good health only functions to further enhance your general welfares. We are referring to the pancreas, liver, and gallbladder. Remember even the muscles should be optimum health to do their job as well.
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