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Considering that in conventional GNSS-R (Global Navigation Satellite System-Reflection) altimetry,the reflected signals are cross-correlated witha locally generated clean replica of the transmitted signal,interferometricprocessing consists of the measurement of the complex cross-correlation between the direct and reflected signals.It allows the exploitation of P(Y) code and other civil signals to maximize the height estimation precision.This paper presents a new processing method called QSE (Quadrature Staggered Extracting) which utilizes P(Y) code to explore a further improvement of the altimetry precision.The assessment of the QSE processing procedure illustrates GPS L1 band as an example.In these conditions,this paper analysis the up-looking SNRs obtained by using QSE processing and traditional coherent demodulation respectively.The analysis of the altimetry precision shows that the results obtained by adopting QSE processing improve by a factor about 1.15 as compared to the results obtained by using coherent demodulation.