This paper considers the simple case of a water layer overlying a 1 ohm-m half space to study the signal properties of a horizontal current dipole source in controlled source electromagnetic surveying. Although a conventional CSEM source has much more energy at certain frequencies than a transient PRBS signal with the same strength, processing of the PRBS data provides tremendous gain in signalto- noise ratio. Deconvolution alone gives two orders of magnitude increase in signal-to-noise ratio; correlated noise, including magnetotelluric noise, can be reduced by a further order of magnitude; and the air wave becomes separable from the earth response.


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