Patent ID: 6434509
Filing Date: 2002-08-13
Classification: G01S

Abstract:
An object displacement measuring method for measuring a displacement of an object by measuring carrier phases of radio waves emitted from at least three GPS satellites with a reference receiver deployed at a prescribed location and a measurement receiver deployed at the object, comprising the steps of:dividing relative vectors indicating relative positions of said two receivers into long period variation components not dependent on object displacements and short period variation components dependent on object displacements; representing at least said short period variation components by x-, y-, and z-axis components of unit vectors directed toward said satellites from said reference receiver: extracting short period phase components corresponding to said short period variation components of said relative vectors by measuring carrier phases between said receivers and said at least three GPS satellites and passing these measured data through a band pass filter; finding at least three receiver to receiver single differences between said receivers and said GPS satellites; and computing axial components for said short period variation components of said relative vectors based on said at least three receiver to receiver single differences.