GPS Receivers -  A GPS receiver is an L-band radio processor. It processes the signal broadcast by GPS satellites, solves the equations for navigation so that user can easily compute their position, precise time & velocity.

Types of GPS Receivers

1. On the basis of features

2. On the basis of level of accuracy

Types of GPS Receivers on the basis of features

• Not-self-contained receivers: Also known as 'GPS mice'. These are without screen and are need to be connected to a computer for the purpose of visualization of real position of GPS receiver.Bluetooth (wireless) can be the link of connection between the GPS and computer. This type is best used in car-navigation systems.
• Self contained receivers: Have a screen and is integrated with the computer itself. Sometimes. additional features e.g. electronic compass, barometer etc. are found in this type. It is primarily used in boating and aviation.
• Sophisticated receivers: Are meant for professional use. e.g. in the field of mapping & GIS. transportation safety, crop & agriculture etc. Though the working principle remains the same as others, the only important difference is its storage capacity and higher accuracy, which helps to store a larger amount of data that can be treated later in the office.

Types of GPS Receivers on the basis of different levels of accuracy

• C/A Code receivers: These receivers have the accuracy of 1 to 5 m related to position and differential correction so that getting an occupation time of 5 seconds. The recent advancement in the GPS receiver design now enables it to provide sub-meter accuracy down to 30 cm.accurate and takes about 5 minutes of the occupation time.
• Carrier Phase receivers: These receivers provide 10-30 cm GPS position accuracy with differential correction. The distance from the receiver to the satellite is measured by determining the total number of waves which supports the C/A code signal, which is more accurate and takes about 5 minutes of the occupation time.
• Dual-Frequency receivers: provide GPS position accuracy according to differential correction within sub centimeter & accuracy according to survey grade. These receivers are presented with the signals from satellites on the basis of two frequencies at the same time. The use of two frequencies will help in omission of atmospheric and other errors and thus improving the accuracy.