Signal sampling methods
All GPR systems need to sample analog signals from the antenna and digitize them for processing and display. The sampling method, as well as the rate at which samples are taken, can significantly affect the quality of results. Therefore, the sampling rate is an important specification that determines system performance.
Traditionally, GPR systems have utilized a technique called equivalent time-sampling, which requires a new pulse to be sent from the transmitting antenna for every sample recorded on the receiver end. We refer to systems using this method as conventional GPR.
However, modern components now make it possible to use a technique called real-time sampling or RTS, and this is the method we use in all our designs. As the name implies, it means that the ‘real’ signal is captured directly and in sharp contrast to conventional systems, it does not require repetition of the transmission-recording cycle. The result is a GPR system that gathers data thousands of times faster than a conventional one.