Gps Antennas For Gps Systems

Nowadays, most people have an idea of what GPS means and what GPS devices can do

, and all of the GPS magic is possible due to GPS Antennas.

GPS antennas are an important part of any and all wireless systems. The GPS antenna works by combining a planar antenna and a frequency converter, which converts the high-frequency phase-modulated spread spectrum signal of the GPS system to an intermediate frequency.

The GPS antenna acts as an amplifier to boost the GPS indicate for transmission along a cable; usually coax, to the GPS receiver. The signal that the GPS unit receives is crucial to the performance of the unit itself. For maximum signal strength, minimize the length of the coaxial lead from the antenna to the receiver.

The power injector does what it says, sends power up the antenna cable to the antenna. The signal is passed to the GPS receiver. Based on the time and the satellites the receiver can 'see' it calculates its position on the earth.

The GPS antenna must have an unobstructed line of sight to the sky. The signal travels in a straight line and can pass through clouds, glass and plastics but is blocked by objects such as metal and brickwork. The ideal location for a GPS antenna is therefore on rooftop with a good view of the sky. Rooftops that are clear of other structures or geographic features overhead, with views to the horizon, generally make good installation locations. Such a clear view allows the antenna to track the maximum number of satellites throughout the day. Installations with obstructed views may experience reduced reception quality and may not be able to track simultaneously the maximum number of satellites. As a rule of thumb, the better the view of the sky, the greater the likelihood of a good consistent signal lock.

Antennas have sweet spots which are different factors (multiples) of their wavelength, usually halfwave and quarterwave. Bigger antennas do a much better job for any given frequency, but only if they are the right size and shape for the wavelength they are handling.

GPS Antenna splitters eliminate the need to run several antenna cables from several antennas on the roof. You can just run one cable and split it with an antenna splitter as this makes your site installation easier and less expensive.

Nowadays, you can find many different types and brands of GPS antenna available in the market. You can select the one that is most suitable for your own personal or business needs. You can look up the details on the Internet of the various models available and select one that fits your needs and your budget.

by: Chris Cowper

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