Abstract
The standard time and frequency signal broadcast by NPL via one of the narrowband channels of INSAT has been regularly operational since last five years and has been successfully used by several users in different parts of India. The present paper investigates a possibility of introducing a new modulation scheme namely, a Pseudo Random Noise (PRN) biphase modulation. The PRN sequence used has been truncated by about 2% to make it easier to generate and handle. It has however been shown that such truncation does not significantly affect the autocorrelation properties of the sequence. An attempt has been made to keep the data transmission structure similar to that in the present broadcast as far as possible. The complete time transfer system consisting of the transmitter and the receiver have been developed. The schematics have been discussed in detail in this paper. Although the present system has not been tried out on an actual satellite channel it has been tested extensively on the bench.
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