According to the International Telecommunication Union, Radio Communication is a service that involves the reception, transmission and emission of radio waves for definite telecommunication purposes. It is broadly categorized as Space and Terrestrial Telecommunication. The Space radio communication involves the use of space stations or reflecting satellites or objects in space. Other than this is called Terrestrial radio communications.
In the radio communication, system, signals are transmitted by modulating or changing the electromagnetic waves with frequencies that are below the frequencies of visible light. Electromagnetic waves pass through the air and the vacuum of space. It travels through the oscillating fields by changing some properties of the waves, such as frequency, amplitude and phase.
A broadcast receiver only receives content in the shape of signals. On the other hand, a two way radio both transmits and receives signals and is also known as transceiver. An operator, using two-way radio can have conversation with another radio system, working on the same frequency. It is available under different configurations; such as stationary base, mobile and hand-held portable, also known as walkie-talkie. Usually, the two-way radio works on half duplex, in which the operator can either talk or listen. The full-duplex mode is used in cellular phone or mobile phone in which transmission and reception can be done at the same time.
Two way Repeaters are combination of transmitter and radio receiver and cover longer distances. They use two different radio frequencies. After receiving the input frequency, the repeater demodulates the signal and retransmits the information simultaneously on its output frequency. Stations that use the repeater transmit on the input frequency of the repeater and receive on the repeater’s frequency. Thus, a repeater is used as an automatic relay station and is usually installed on top of mountain, tall buildings or radio tower. Base stations, portable stations or mobile stations can have direct communication with each other, over a long range.
Global Positioning System (GPS) is a radio-navigation system. It has been formed from the constellation of 24 satellites and their ground stations that transmit microwave signals to GPS devices, carried by a moving vehicle. It gives information on the precise location, direction, time and speed of the vehicle. The GPS Vehicle Tracking system gives both historic and real time navigation data of journey. The recorded data can be transmitted to a centrally located server, connected to the internet. It can also be stored within the tracking unit.
GPS Vehicle Tracking system can be beneficially used by companies, dealing with fleet of vehicles for monitoring and managing individual vehicle. It is also known as Automatic Vehicle Locator System (AVLS) or Automatic Vehicle Location (AVL). The transmission mechanisms used are General Packet Radio Service (GPRS) or GSM. The location is displayed against a backdrop of map. GPS data tracking is available for smartphones. The following are the benefits of GPS vehicle tracking system
Stops wasteful idling of vehicles
Monitors excessive speed and the consequent fuel economy
Stops aggressive driving, harsh braking and jackrabbit starts
Cuts down, non-commercial use by monitoring after-hours status
Curtails wasted miles by providing direction to drivers for unfamiliar areas, based on the Google Reading
Reduces risk and cost of Insurance
Compares driving habits of drivers
Crisis management and communication