In order to enhance the inspection abilities of an ultrasound system, it can be convenient to increase the number of probes used for the monitoring. In case of multiple simultaneously-operated transmitting transducers, the possibility of interference among the multiple excitations injected in the system should be considered. To avoid such interference, one may use code division. This solution requires some special processing when applied to systems that rely on guided waves (GWs) inspections. In this work, a phase-modulation and pulse compression strategy for guided wave inspections which is based on the Warped Frequency transform is proposed. doi: 10.12783/SHM2015/154