<div>This paper presents the local correlation method of low-SNR (Signal to
Noise Ratio) and strongly RFI (Radio Frequency Interference)
contaminated DOR (diﬀerential one-way ranging) signals with China’s
lunar spacecraft. Unlike the Very Long Baseline Interferometry (VLBI) FX
correlator used in China VLBI net, the core of local correlation is to
construct the received signal model based on the intrinsic
characteristics of DOR signals, then extract the residual frequency and
phase relative to the model. The performance of the method is veriﬁed by
means of orbit determination and post-ﬁt residuals analysis. The RMS
(root-mean-square) of Delta-DOR delay after orbit determination are 3.7
ns and 0.83 ns when tones SNR varied of 1 dBHz ∼ 20 dBHz and 14 dBHz ∼
26 dBHz in two individual experiments. The computed standard deviation
of post-ﬁt delay residuals is compatible at 3 sigma level with the
theoretical spacecraft thermal noise. Local correlation provides a
solution to the special RFI contaminated DOR signals process. The
precision of Delta-DOR delay with strong RFI keeps the same level of
that without interference.</div>