Indian Railways to introduce real-time train tracking via GPS system March 27, 2, Indian Railways Indian Railways have made an announcement that the trains may soon get real-time GPS tracking system to avoid accidents. As per reports, the price of GPS devices will be approximately Rs 70, — 1, 00, per train, would be fitted in about trains, which may help avert collisions and avoid loss of lives. The GPS system can give an accuracy of about 10 metres, with a lag of about 2 minutes. However, CRIS aims to shorten the distance to about 3 metres, the average distance between two gauge lines, a critical factor that can prevent accidents if a train on another line is derailing.
Byten more experimental Block-I satellites had been launched to validate the concept. On May 2, "Selective Availability" was discontinued as a result of the executive order, allowing civilian users to receive a non-degraded signal globally.
Bush updated the national policy and replaced the executive board with the National Executive Committee for Space-Based Positioning, Navigation, and Timing.
Collier Trophythe nation's most prestigious aviation award. Bradford Parkinsonprofessor of aeronautics and astronautics at Stanford Universityconceived the present Gps based train tracking system in the early s and developed it in conjunction with the U.
Parkinson served twenty-one years in the Air Force, from toand retired with the rank of colonel. GPS developer Roger L. Easton received the National Medal of Technology on February 13, The IAF Honors and Awards Committee recognized the uniqueness of the GPS program and the exemplary role it has played in building international collaboration for the benefit of humanity.
Basic concept of GPS[ edit ] This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. The satellites carry very stable atomic clocks that are synchronized with one another and with the ground clocks.
Any drift from true time maintained on the ground is corrected daily. In the same manner, the satellite locations are known with great precision. GPS receivers have clocks as well, but they are less stable and less precise. GPS satellites continuously transmit data about their current time and position.
A GPS receiver monitors multiple satellites and solves equations to determine the precise position of the receiver and its deviation from true time.
At a minimum, four satellites must be in view of the receiver for it to compute four unknown quantities three position coordinates and clock deviation from satellite time. More detailed description[ edit ] Each GPS satellite continually broadcasts a signal carrier wave with modulation that includes: A pseudorandom code sequence of ones and zeros that is known to the receiver.
By time-aligning a receiver-generated version and the receiver-measured version of the code, the time of arrival TOA of a defined point in the code sequence, called an epoch, can be found in the receiver clock time scale A message that includes the time of transmission TOT of the code epoch in GPS time scale and the satellite position at that time Conceptually, the receiver measures the TOAs according to its own clock of four satellite signals.
From the TOAs and the TOTs, the receiver forms four time of flight TOF values, which are given the speed of light approximately equivalent to receiver-satellite ranges. The receiver then computes its three-dimensional position and clock deviation from the four TOFs.
In practice the receiver position in three dimensional Cartesian coordinates with origin at the Earth's center and the offset of the receiver clock relative to the GPS time are computed simultaneously, using the navigation equations to process the TOFs. The receiver's Earth-centered solution location is usually converted to latitudelongitude and height relative to an ellipsoidal Earth model.
The height may then be further converted to height relative to the geoid e. These coordinates may be displayed, e. User-satellite geometry[ edit ] Although usually not formed explicitly in the receiver processing, the conceptual time differences of arrival TDOAs define the measurement geometry.
The line connecting the two satellites involved and its extensions forms the axis of the hyperboloid. The receiver is located at the point where three hyperboloids intersect. While simpler to visualize, this is the case only if the receiver has a clock synchronized with the satellite clocks i.
There are marked performance benefits to the user carrying a clock synchronized with the satellites. Foremost is that only three satellites are needed to compute a position solution.
If it were an essential part of the GPS concept that all users needed to carry a synchronized clock, a smaller number of satellites could be deployed, but the cost and complexity of the user equipment would increase. Receiver in continuous operation[ edit ] The description above is representative of a receiver start-up situation.
Most receivers have a track algorithmsometimes called a tracker, that combines sets of satellite measurements collected at different times—in effect, taking advantage of the fact that successive receiver positions are usually close to each other.The American Public Transportation Association estimated that, at the beginning of , around half of all transit buses in the United States were already using a GPS-based vehicle tracking system to trigger automated stop announcements.
STAY FOCUSED ON WHAT MATTERS. FROM A TO Z: FOCUS outsourcing approach will take care of your fleet tracking and fuel management needs from development to ROI calculations. Basic to mid-level GPS watches track a combination of metrics like: speed, pace, distance, heart rate, calories, sleep cycles, and may come with music, app and bluetooth features.
Higher priced watches feature more advanced options with topographical maps, barometers, altimeters and . A VTS combines the installation of an electronic device in a vehicle, or fleet of vehicles, with purpose-designed software (itracksolution) to track the vehicle's location, collecting data in the process from the field and deliver it to the base of operation.
iTtrack-M8 use GPS technology for locating the vehicle. Best Android GPS Tracking Apps. GPS tracking refers to the use of Global Positioning Systems in order to determine the exact geographic position/ location of a place, person, vehicle or any other assets.
GPS is capable of recording the location of assets at regular intervals as well. RailRadar GPS, a train-tracking platform to track and display real-time movement of trains in the railway network on Google Maps, has been launched. Passengers can track and display on their smartphon.