Skip to main content

GEO- POSITIONING SYSTEM

   


      One fine morning, you wake up in the middle of dense forest.  You do not know where you are?  But luckily, you have a FM radio set.  Tune the radio, you hear one station feebly.  You know the location of that radio station.  The maximum range of that FM station is 100 km (say).  You must be at the edge of 100 km since the FM signals are weak.  Now, you draw a circle with that radio station as the center and 100 km as radius.  You must be somewhere on the edge of the circle.

     Now try for another station.  Luck favors you again.  You get second station that too feebly.  Now this station as center, you draw second circle of same radius.  Now the two circles meet at two points. You may be on any one of the point.  Still the information is not enough.  Try your luck again.  The God of luck is still with you.  You get third FM station some what clearly.  Draw third circle as usual.  The three circles meet at one point.  Thank God, that is your location.  This is known as 'triangular method'.  This technique is used in Geo-positioning system . (GPS)

      There are 31 satellites in GPS orbits now.  A minimum of 4 satellites will be in contact with GPS receiver you have.  Each will send the signals to your receiver and get it back in milliseconds.  Then the satellite calculate the distance between you and itself using the time.  Next it will draw an imaginary sphere around it using calculated distance as radius. (No circles in space, only spheres)

      You can be anywhere on the surface of the sphere.  Each satellite will draw its own calculated sphere.  Earth sphere can also ,be taken into account.  Using the triangulation method you will be located accurately by GPS.  That is, all the spheres will meet at one point where you are exactly located.

      GPS now have accuracy of 5 meters.  It will come down to centimeters in future.
    GPS is the boon to modern day navigation. 

Comments

Post a Comment

Popular posts from this blog

Your heart -you do not know

  Size and Location: The human heart is roughly the size of a clenched fist and is located slightly to the left of the center of the chest. Despite its relatively small size, the heart plays a crucial role in pumping blood throughout the entire body. Heartbeat Variability: The heart does not beat at a constant rate. The interval between heartbeats can vary, and this variability is considered a sign of a healthy heart. Factors such as breathing, emotions, and physical activity influence the heartbeat. Electrical Conduction: The heart's contractions are controlled by electrical impulses. The sinoatrial (SA) node, often called the "natural pacemaker," generates electrical signals that regulate the heartbeat and coordinate the pumping of blood. Blood Pumping Capacity: On average, the human heart pumps about 2,000 gallons (or 7,570 liters) of blood each day. Over a lifetime, this amounts to pumping enough blood to fill several Olympic-sized swimming pools. Heart Chambers and V...
Post a Comment
Read more

THE WORK HORSE "="

    One cannot think of  a mathematical step without 'is equal to ' .  It balances right hand side and left hand side.  It aids simplification and manipulation of a mathematical expression. example: 2(A+B)  = C 2A+2B  = C         2A = C-2B           A = C-2B/ 2   In an electronic calculator,  the pressing of ' = " sign executes an asthmatic expression  or simply calculates.       In computer languages, it plays very important role.                                                                 A = B   When a computer looks at this expression, the value stored in the location named B is just transferred to the storage named A .  After execution both A and B will have the same value an...
Post a Comment
Read more

How does your smart phone detect motion, steps, rotation, and location?

 How it works-1  An accelerometer in a smartphone is a microelectromechanical system (MEMS) device that measures acceleration and tilt. It works by detecting changes in motion by measuring the vibration or acceleration of the device. The accelerometer consists of a small mass suspended on a spring inside a sealed chamber. When the device is subjected to acceleration, the mass moves relative to the device, causing a change in capacitance that can be measured and processed by the smartphone's hardware. The accelerometer measures acceleration in three dimensions (x, y, and z) and provides data that the smartphone's software can use to determine the device's orientation, detect motion, and track changes in velocity and acceleration. The accelerometer is used for a variety of purposes in a smartphone, including screen rotation, motion tracking for games and fitness apps, and detecting the position of the device for navigation and location services. Additionally, it can be used t...
Post a Comment
Read more