GPS is through receiving satellite signals to locate or navigation terminal. And you must use the antenna signal reception. GPS satellite signal is divided into L1 and L2, frequency of 1575.42 MHZ and 1228 MHZ, respectively the L1 for open civil signal, the signal for the circular polarization. Signal strength is about 166 DBM, belongs to the weak signal. These characteristics determine the need for GPS signal receiving antenna.
