Patent ID: 6853200
Filing Date: 2005-02-08
Classification: E03F,F16L

Abstract:
1. A method for retrieving predetermined locations in sewer and pipeline systems after the application or the deposition of a layer of material, in which a carrier vehicle having a microwave sensor is used which emits microwave signals and receives backscattered microwave signals, characterized by having the following steps: conduction of a first run inside said sewer respectively said pipeline system with said carrier vehicle before said application or said deposition of said layer of material in which said sought locations are detected by means of an imaging system, with in at least one section of said sewer respectively pipeline system a first temporal signal profile of said backscattered microwave signals being recorded and the sought locations being marked in said first signal profile; and conduction of a second run with said carrier vehicle after said application or said deposition of said layer of material, with a second temporal signal profile of said backscattered signals being recorded during said run and the current position of said carrier vehicle in said sewer respectively said pipeline system relative to said sought locations being determined by comparison with said first signal profile.