1. A method for use in generating multi-channel coherent sensor data, comprising the step of: receiving single channel coherent sensor data obtained by operating a single channel coherent sensor system in a real world environment; and synthesizing the single channel coherent sensor data to provide multi-channel data, wherein said multi-channel data is based on real world single channel data to provide realistic background characteristics without the need to obtain real multi-channel coherent sensor data by operating a multi-channel coherent sensor system in a real world environment; wherein said single channel coherent sensor data comprises a series of samples having sequential time values reflecting the sequential acquisition of said single channel coherent sensor data by said single channel coherent sensor system, and said step of synthesizing comprises resampling said series of samples into sets of samples free from transformation into a frequency domain, wherein each set includes a plurality of samples having a common time value.