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Time Delay and Range Estimation of Received Signals in Deep Space PN Ranging

Athira Thulaseedharan and Indhu Gopan*

The trajectory models of spacecraft tracked by the Deep Space Network are improved by using Range measurements. A stable acoustic time of flight in low SNR is acquired by adopting a time delay estimation method of cross correlation and auto correlation. In this article the PN sequence is first introduced, and then the commonly used m- sequence and its application for time delay measurement is summarized. Linear Feedback Shift Registers are used for the implementation of PRBS signals. In this project, the entire design of the PRBS generator and correlation technique was implemented using VHDL programming language and the simulation were done and tested on the LIBERO IDE v9.0 simulator. Simulation is made by Matlab as well as VHDL and has compared the same.