METHOD FOR IONOSPHERE RANGE ERROR DETECTION WITHIN TWO-FREQUENCY MEASUREMENTS Russian patent published in 2008 - IPC G01S5/14 

FIELD: physics.

SUBSTANCE: invention refers to methods of ionosphere range error elimination in radio-navigational receivers. Proposed method implies that linear combination of range measurements is created to eliminate regular errors and detect ionosphere errors, followed by local modelling of vertical ionosphere range errors within consumer area in the form of Taylor limited sequence of several variables with the degrees not exceeding two, creation of combined equations associating stated linear combinations with local error modelling indices, solution of the said redundant combined linear equations with least squares method whereat exact Doppler increments on two coherent frequencies f₁ and f₂ are applied instead of rough code pseudorange measurements.

EFFECT: elimination of ionosphere measurement errors.