Development of a GPS Time-Transfer Receiver and Time Comparison Results

The performances of the rece iver deve loped by PRL a r e ; t ime f l uc tua t ion o f 6 to 20 n s a t c a r r i e r t o n o i s e d e n s i t y r a t i o (C/NoL8 of +40 t o +55 dBHz and f r e q u e n c y s t a b i l i t y o f 2 x 1 0 / t a u . The ove r -a l l receiver de l ay was measured by us ing a CPS s i g n a l s i m a l a t o r with accuracy o f 15 ns. The r ece ive r does s o t use the ionosphere compensation data from the GPS s a t e l l i t e s . b u t u s e s i t s own model based on t o t a l e l e c t r o n c o n t e n t s da t a measu red a t RRL.