Method for multi-target-enabled resolution of phase ambiguity

摘要

In order to derive distance information according to the phase measuring principle, a periodic signal with at least two, in particular modulated, wavelengths λ_i are transmitted to two or more objects, their reflections are received again and the associated phases φ_i are determined and decomposed into their individual object phases φ_ij which are assigned to the J objects. In order to resolve phase ambiguities, an ambiguity interval in which at least one object is located is divided into cells (5) with a defined width, with each cell (5) being assigned a counter reading and a distance. The counter reading is incremented for the cells (5) which are assigned to a possible object distance, with the incrementation being carried out for a periodicity sequential variable and for all the phases. An absolute phase or a true object distance D_j from the at least two objects is determined from the distribution of the counter readings.