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We propose a new method to measure parameters of SMBHBs as individualresolvable evolving single GWs sources, using the timing data of three or morenon-simultaneous pulsars. These parameters include the sky position of theSMBHB and a chirp mass-red shift combination M_c(1+z). This method requiresboth the Earth term and the pulsar terms observed in the power spectra oftiming residuals. The method takes only the frequencies values, thus theaccuracy of parameters estimation is not dependent with SNR nor the form oftiming noises. We applied our method to simulated timing data of three pulsarsto check its validity, the GWs sources location can be constrained with anaccuracy \Delta\Omega~800deg^2, the chirp mass can be determined with arelative error of ~50%. Our method works better than previous method, when thesize of PTA is small and the SNR of individual pulsar is low, which is likelythe case of near future. In case of large array and how SNR in far future, ourmethod can provide good prior parameters distribution for Bayesian inference.

A noise independent method of measuring sky location and chirp mass of  gravitational waves single sources, using non-simultaneously timing of  pulsars