This Is How GPS Works

GPS consists of 3 segments: the Space segment, Control segment/controller, and User segment. Where the space segment consists of 24 satellites that operate in 6 orbits at an altitude of 20,200 km and inclination of 55 degrees over 12 hours (satellites will return to the same point in 12 hours). The satellite circles its orbit so that there are at least 6 satellites that can be monitored at any point on earth. The satellite sends position and time to users all over the world. With such a sophisticated capability, it’s no wonder why GPS isn’t being used only in the military anymore, and even other fields of work have begun to use GPS too. As an example, a lot of companies these days use GPS with geo fencing features in order to conduct location-based marketing.

Each one sends two signals, they are L1 with 575.42 MHz and L2 with 1227.60 MHz. L1 signal is modulated with two pseudo-random signals, P-code (Protected) and C / A (coarse / acquisition) code. L2 signals only carry P codes. Each satellite transmits a unique code so that the receiver (GPS device) can identify the signal from each satellite. When the “Anti-Spoofing” feature is activated, the P-code will be encrypted and then known as the P (Y) code or the Y code.

GPS devices specifically for civilians only accept C / A codes on L1 signals (although sophisticated GPS devices can utilize L2 signals to get more precise measurements).

GPS devices receive signals that are transmitted by GPS satellites.
In determining position, we need at least 3 satellites for positioning 2 dimensions (latitude and longitude) and 4 satellites for positioning 3 dimensions (latitude, longitude, and altitude).

The more satellites obtained, the higher our position accuracy will be. To get these signals, the GPS device must be in an open space. If our GPS device is in a room or dense canopy and our area is surrounded by tall buildings, the signal obtained will be reduced so it will be difficult to determine the exact position or even unable to determine the position.

Through GPS we can find out the existence of an object wherever the object is in the entire face of the earth both on land, sea, and air.

This Is The Effect Of An Extremely Cold Temperature On The Human Heart

Do you remember a film about someone who was stranded in Antarctica? The film “Arctic”, starring Mads Mikkelsen, tells the story of someone who struggles to stay alive facing various conditions on the ice continent one of the biggest challenges is extremely cold weather. In fact, when you are in extreme cold, there are many changes that occur in the body, including the work of the heart. Then, what are the effects of these cold temperatures on the body and heart? In general, extremely cold weather causes the body to experience hypothermia. Hypothermia is a condition in which body temperature decreases due to loss of the body’s ability to balance the temperature inside. Therefore, if you want to make sure that you will not suffer from hypothermia in your own house, we recommend you to click here and find out more about the best gas furnace that you can buy.

Hypothermia symptoms that are easily recognized such as:

Tend to be sleepy.
Difficult body movements that require balance, such as buttoning a shirt or opening gloves.
Confused and difficult to concentrate.
The tips of the fingers will feel painful.
Joints stiff and painful so that it is increasingly difficult to move.
Experiencing frostbite, which is a sensation of fingers like being pricked by a small needle until it finally numbs or becomes numb to touch.

Effect of cold temperatures on the heart

To maintain body temperature, the heart will pump more blood so that the heartbeat will be faster and blood pressure will increase.

People who have had heart problems before should be wary of extreme weather like this. Because the influence of cold temperatures is quite bad on the heart. The heart works harder and the blood vessels become smaller, reducing blood flow to the heart muscle.

In fact, the blood that goes to the heart muscle is full of oxygen and nutrients for muscle cells. Well, if the flow is blocked then the muscle cells are not able to function properly.

In people who have narrowed heart arteries, the influence of cold temperatures can cause heart attacks. Well, this can happen in winter in European countries, imagine if the weather becomes extreme cold as in Antarctica in the film “arctic”.