Ground Penetrating Radar (GPR) is one of the most popular subsurface sensing devices. It has a wide range of
applications such as landmine detection, archeological investigations, road condition survey and so on. Hardware and
software requirements of the GPR system are strongly dependent on type of applications. Principally, lower frequencies
provide deeper penetration and low resolution, but higher frequencies are able to detect shallow objects with high
resolution. As a fundamental design criterion, there is a trade-off between penetration depth and vertical resolution. In
impulse radar, pulse duration (frequency related) is a key parameter because it affects the system detection performance.
Specially, optimization of the pulse duration is a challenging problem for landmine detection because the GPR
performance has been strongly affected from mine types, varying terrain and environmental conditions. In this work, two
GPR systems with pulse durations of 650 ps and 870 ps are compared for evaluation of their detection performance. The
pulses are tested with extensive data sets collected from different soil types by using surrogate mines and other objects.
Receiver Operating Characteristic (ROC) curves of the system is also calculated. It seems that the 650 ps pulse duration
gives better performance than the 870 ps pulse duration for the shallow landmine detection.