No subject

SATELLITES WITH APPLICATION OF THE MITREX - MODEM", Hartl specifies
that "The PN-code is a truncated maximum length sequence of period
10.000, instead of the 16.383 chips". In the Xilinx application note
XAPP052, we can find that the taps for an MLS of 14 bits should be
14,5,3,1. In the paper "GEOSTATIONARY SATELLITE POSITION DETERMINATION
FOR COMMON-VIEW TWO-WAY TIME TRANSFER MEASUREMENTS" there is an
introduction that suggests the MITREX 2500 modem has a variable
pseudorandom noise sequence. Maybe the modem was built in different
versions wrt the PN sequence generation.

On Fri, Mar 25, 2022 at 2:37 PM <jeanmichel.friedt at femto-st.fr> wrote:
>
> Dear community,
> I am trying to find historical documents describing the pseudo random sequences used
> in the SATRE Two-Way Satellite Time and Frequency Transfer (TWSTFT) modem.
> K. Imamura & F. Takahashi (Two Way Time Transfer Via a Geostationnary Satellite,
> J. of the Comm. Research Lab., 39(1), March 1992) describe the code structure
> (14-bit long pseudo random sequence truncated to 10000 bit length) but the
> generator polynomial coefficients are not given. I have not been able to find this
> information in Timetech's SATRE manual nor in the publicly available literature.
> This paper cites "P. Hartl, A modem for microwave time and ranging experiments
> via telecommunication satellites, MITREX2500 Manual, Jan 1989" which I am unable
> to locate.
> Would anyone have such a document, or at least could tell me whether the generator
> polynomials are described there? Alternatively, does anyone have a description of these
> 14-bit polynomial generators?
>
> Thanks, Jean-Michel
>
> --
> JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon, France
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