GPS Tracking System - How Its Components Work

Born of the best minds from a concept so simple is an exceptional

complex system, the GPS tracking system. It is made up of three

componentsL satellites that orbit the earth, control and monitoring

stations and the GPS receivers. It is a radionavigation system

providing reliable positioning, navigating, and timing services not

just for the military but also to civilian users as well in any part

of the world. The GPS tracking system has drastically changed the

world of navigation through land, sea and air, in all weather, 24/7.



The Global Positioning System (GPS) is a U.S. space-based

radionavigation system that provides reliable positioning, navigation,

and timing services to civilian users on a continuous worldwide basis

-- freely available to all. For anyone with a GPS receiver, the system

will provide location and time. GPS provides accurate location and

time information for an unlimited number of people in all weather, day

and night, anywhere in the world.

In the 1960s the U.S. Navy and Air Force worked together on a number

of systems that would be able to provide a variety of navigation

applications. In 1973 the Department of Defense aimed to direct the

services in unifying their systems. The concept of the tracking

system would be atomic clocks onboard satellites was tested

successfully by an earlier Navy program called TIMATION. The Air

Force would operate the new system called the Navstar Global

Positioning System. From then on, it has since been known as simply

GPS or Global Positioning System.

The GPS tracking System Satellites

Today's GPS Operational Constellation is funded and controlled by the

U.S. Department of Defense and being operated by the U.S. Military.

It is comprised of three major components: a "constellation" of

satellites in Earth orbit, ground stations that controlled the system

and receivers hand carried by the users. It was so designed so that

these receivers could be made small and inexpensive and would not

require atomic clocks.

The GPS tracking system is an aerospace technology comprising of at

least 24 operational satellites at all times. Each satellite is on a

circular orbit 20,000 kilometers above the Earth on a 12-hour period.

In order to make sure that these satellites are detected from anywhere

on the surface of the Earth, the satellites are divided into six

groups having four space vehicles each. The six orbital planes

completely surround the Earth, equally spaced 60 degrees apart and at

an angle of about 50 degrees with respect to the equatorial plane.

Each group is assigned a different path to follow. The orbit altitude

is such, that the GPS satellites recapitulate the same ground track

and configuration at approximately over any point each in 24 hours.

The GPS tracking system's navigation message consists of time-tagged

data bits that mark the time of transmission of each subframe at the

time they are being transmitted by the space vehicle. A data bit

frame consists of 1500 bits divided into five 300-bit subframes and a

data frame is being transmitted at an interval of 30 seconds. There

are three six-second subframes containing orbital and clock data.

Precise clock corrections are sent in subframe one and orbital data

sets or ephemeris data parameters for the transmitting space vehicle

are sent in subframes two and three. Various pages of the system data

are being transmitted in subframes four and five. So the GPS tracking

system has an entire set of twenty-five frames or 125 subframes

creating the complete navigation message sent over a 12.5-minute

period.

The GPS Tracking System Equipment on the Ground

Ground stations are used so that each satellite orbit are accurately

tracked. The GPS tracking system has ground stations which is

comprised of a receiver and antenna, as well as communication tools to

transmit the data to the data center. When the GPS satellites supply

specially coded signals, the omni-directional antenna at each site

picks up the signals and that is processed in a receiver. The

receiver then separates the signals in various channels for a

particular satellite and frequency at a particular time. Once the

signals are isolated, the receiver now decodes them and splits them

into individual frequencies to calculate position, velocity, direction

and time anywhere on Earth.

At least four GPS satellite signals consisting of space segments are

used in computing positions in three-dimensional locations - latitude,

longitude and altitude - and the time offset in the receiver clock.

All GPS tracking system satellites have synchronized operations so

that the signals are transmitted at the speed of light to the

equipment on the ground. Each GPS satellite broadcasts data

indicating its location and current time.

Since the GPS tracking system sites are constructed throughout the

world and are being monitored by different institutions worldwide,

there are many different data center locations. The role of the data

center is to both monitor and control the GPS tracking system

stations. The data center uses an automated computer system in

retrieving and analyzing data from the receivers. Once processed, the

data, including the original raw data, are sent to scientists around

the glob for use in various applications.

From laboriously built landmarks by our ancestors to shooting the

stars to chronometers to satellites, our technology has evolved faster

than we could ever imagine. The GPS tracking system is the most

recent and significant advancement in navigation and positioning

technology. This new constellation of artificial stars serves this

important need for both the military and civilian users and is now

fast becoming important in everyday life.

Mp3 Player- Not Just All About Listening Music

MP3 player and iPod are synonymous for many music lovers. However, there are some manufacturers who are inserting more interesting features in MP3 players. Hence, while choosing an MP3 player, you need to have an extensive research. Online MP3 player reviews help a lot in this regard. They display impartial, unbiased and first-hand information written by fellow users who used the particular brand or MP3 player model earlier.

Like all electronic products, in case of MP3 players, beauty is only skin dipped. Rather you should take specifications to consideration to get best value for your money. The specifications you need to search for before buying your on-go musical gadget are Bluetooth, wi-fi, storage capacity, memory expansion facility, built-in speakers music-sharing option etc.

Bluetooth provides a wireless medium to satiate your quest for music. Bluetooth frees your ears from wires and makes your acquaintance with music more enjoyable. If you want to take music to your living room away from the room where your PC is placed, you can buy an MP3 player that has wi-fi compatibility. It will help to stream media applications like video, images and music from your PC.

No doubt, MP3 players with higher storage and memory expandable slot cost more. But, they have the capability to pile up your favorite tunes in mass without deleting one. If the MP3 player has built-in speaker facility, you can play music both publicly and privately. Music sharing option enables you to inform your friends regarding your quality taste and share your favorites with them. For music video lovers, a large screen MP3 player is definitely a good buy.

While thinking about buying an MP3 player, keep in mind that you are investing your hard earned money and buying an asset for a significant period of time (can you afford to buy an MP3 player on every weekend?). Hence, make proper homework, go through the MP3 player reviews and make a wise decision.

Samsung U900 Silver—The Flagship Phone

The Samsung U900 Silver is a real conquest in the market. This mobile can be called the flagship model of Samsung. At the very first glance this mobile makes a statement that it is quite different from all its foils. This handset has a super sumptuous slim slide which presents a very heart throbbing look. This new slider cell appears to be very escorting to the customers of all the slim handsets.

Highlights of Samsung U900 Silver

This phone is a complete tri-band slider. The mobile has a 5.0 mega pixel camera, a touch keypad, GPRS, EDGE and a music player. About 80MB of memory is provided which can be expanded using a micro SD Slot. Features like WAP and TV-Out are also present. The battery provides a talk time of up to 3.5 hours and a stand by time of up to six days.

Look Factor of Samsung U900 Silver

Unlike the prior slider phones in the market, Samsung U900 Silver presents a fully clad look enclosed in a very vivid and eye-catching silver metal color format. The bright color design is really creating a rant and rave in the market. Features such as soft key group, a typical d-pad and a new OLED touchpad have been designed comprehensively to give a face-lift to the mobile. The glossy back gives a high end gaze to the headsets.

Display Feature

The Samsung U900 Silver has a color screen which works on a very clear and high color display. The size of the display is 2.2 inches. The screen resolution is 240x320 pixels. Up to 16 million colors can be displayed which is quite far than the needed to view clear pictures, images and video clips. The user can enjoy faster and easy access to the menu via the magic touch navigation pad.

Camera Feature of Samsung U900 Silver

The Samsung U900 Silver has a 5.0 mega pixel camera which possesses all the features of any latest camera phone in the global market. Features like Flash, Image Stabilizer, Photo setting and face detection can make the customer click the pictures in a professional way. Irrespective of the light conditions present in the surroundings the Flash helps to obtain high quality photographs. The image stabilizer makes it easy to direct the hands while clicking.

Nokia 5800 Xpressmusic Red Best Choice

The 5800 Xpress Music is a touch screen music phone that comes with high ended features & 3G technologies. This desirable phone includes high quality features that include a music player, 3.2 megapixel Camera complete with Carl Zeiss optics & video recording capabilities and GPS navigation with Nokia Maps applications. This sleek casing phone comes with a sophisticated look that is mainly black in color and complimented by a hint of red. The 5800 Xpress Music phone is 15.5mm deep by 51.7mm wide by 111mm tall and weighs 109 grams including the fitted battery that gives the phone a solid feel. The Nokia 5800 Red supports 3G HSDPA & Wi Fi technology. The 3.2 Inches screen provides a 640 pixel by 320 pixel screen resolution & displays up to 16 million colors for the user to experience on this beautiful touch screen phone.

The Nokia 5800 XpressMusic Red is a member of the Nokia Xpress Music range that also includes other music orientated phones such as the Nokia 5320 Xpress Music, Nokia 5610 Xpress Music and Music. The phone comes with a 3.2 megapixel camera that is perfect to capture photos and moving videos. The phone also have second camera that is used when the user wishes to take part in a two way video call. The 5800 Red comes with 3G HSDPA technology that allows the user to experience & enjoy high speed Internet connectivity at broadband type speed & fast data transfers. The user can connect to other compatible devices to transfer files between compatible devices using a Bluetooth wireless connection or a USB wired connection.

The Nokia 5800 Red comes with a 3.5mm AV connector port & a TV output port. The 5800 Red works over a quad band network that covers four GSM bands as well HSDPA coverage. A rechargeable battery provides thirty five hours of music playback time from a fully charged battery. The 5800 Red comes with a built in video player that can play popular video formats. The phone comes with eighty one megabytes of internal memory & an eight gigabyte memory card that allows the user to enjoy the external memory feature. The 5800 Red comes with an integrated Web browser, all the popular messages services includes SMS MMS and instant messaging. The 5800 Red also includes a built in FM radio and stylish music phone. You can compare a lot of deals Nokia 5800 blue and Red with best offers.
The Nokia 5800 blue and Red includes all the latest features that allow the user to experience.