from $z=0.1$ to $z=1.0$ with the velocity uncertainties $\sigma_{\Delta v}$ ranging from 1% to 10%. This could be reached in the timespan $\Delta t_o = 0.5$ years, which leads to an extremely competitive and ideal scenario. Note that the requirement of this scenario is $10^7$ galaxies observed in each bin [@Martins:2016bbi].

In addition, in the mock data simulation, we adopt the scheme accordant with our previous papers [@Geng:2018pxk; @Geng:2014ypa; @Guo:2015gpa; @He:2016rvp; @Geng:2014hoa; @Geng:2015ara; @Zhang:2010im]. In other words, the fiducial cosmology for the SL simulated data from the E-ELT or the SKA is chosen to be the best-fit cosmology according to the analysis of the data combination of SN+CMB+BAO in the $\Lambda$CDM model, the $w$CDM model, the CPL model, and the HDE model, respectively.

Results and discussion {#sec:Results and Discussions}
======================

Since the $\Lambda$CDM model is widely regarded as a prototype of the standard cosmology, we take this model as a reference model to test the constraining power of the SKA-only mock data and make an analysis of constraints on cosmological parameters when the redshift drift data of SKA and E-ELT are combined. In Fig. \[mockDV\], we show the simulated redshift-drift data for E-ELT, SKA1, and SKA2, using the $\Lambda$CDM model 