Orbit determination using incremental phase and TDOA of X-ray pulsar<FootNote> Project supported by the National Natural Science Foundation of China (No. 61401340), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2016JM6035), the Fundamental Research Funds for the Central Universities, China (No. JB161303), and the Areospace T.T.&C. Innovation Program (No. 201515A) </FootNote>