Patent ID: 7990151

Claim:
A human-portable self-standing locator system for locating a buried object characterized by an electromagnetic (EM) field emission, the system comprising: at least three foldable support elements adapted to support the locator system on a substantially horizontal surface; within at least one of the foldable support elements, an EM sensor array; a gradient processing circuit coupled to the EM sensor array for producing a signal representing the B-field gradient at the EM sensor array as a function of time within at least one frequency band; a locator processor coupled to the gradient processing circuit for producing signals representing target locations responsive to signals accepted from the gradient processing circuit; an accessory mounting interface (AMI) coupled to the locator processor and disposed to accept temporary attachment of an accessory sensor system; a user interface coupled to the locator processor for accepting user commands and for indicating the buried object location relative to the locator system; wherein the AMI comprises a mechanical coupler adapted to temporarily fix the accessory to the locator system, and an electrical connector adapted to transfer electronic signals and electrical power between the locator system and the accessory.