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This paper reports the results of an analysis of the Doppler tracking data ofPioneer probes which did show an anomalous behaviour. A software has beendeveloped for the sake of performing a data analysis as independent as possiblefrom that of J. Anderson et al. \citep{anderson}, using the same data set. Afirst output of this new analysis is a confirmation of the existence of asecular anomaly with an amplitude about 0.8 nms$^{-2}$ compatible with thatreported by Anderson et al. A second output is the study of periodic variationsof the anomaly, which we characterize as functions of the azimuthal angle$\varphi$ defined by the directions Sun-Earth Antenna and Sun-Pioneer. Animproved fit is obtained with periodic variations written as the sum of asecular acceleration and two sinusoids of the angles $\varphi$ and $2\varphi$.The tests which have been performed for assessing the robustness of theseresults are presented.

Pioneer 10 Doppler data analysis: disentangling periodic and secular anomalies