The controlled multi-frequency data bandwidth pseudorandomequipment, invented by and named after academician He Jishan, caninduce an ideal field source of electrical survey, whose energy wascentralized on several equal-spacing dispersed frequency on the logcoordinate. The pseudorandom multi-frequency detection based on theexited signal, not only has the properties of obvious anomaly, as in thetime domain IP method, and rich information in the single survey, butalso has the properties of strong ant...