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This paper proposes an analytical model for estimating the standard deviation of the measurement ( ) error in a coherent early-late delay lock loop DLL when the input code is corrupted by a disturbing signal with ( ) arbitrary spectrum features. The approach is to analyze by Fourier techniques the interactions between the disturbance and the DLL processes to determine how the measurement is affected. The main utility of this model is for the analysis of interference effects on receivers for navigation systems, such as GPS, GLONASS, the Wide ( ) ( ) Area Augmentation System WAAS , and the European GNSS Navigation Overlay Service EGNOS .Following the theoretical derivation, the model is validated by comparison with experimental results obtained by adding radio frequency interference at different spectrum frequencies on a real navigation receiver. A theoretical analysis is also presented to cross-check the correspondence between the proposed model and the well-known models for the case of white-noise disturbances.