P.V. Sharshavin - Post-graduate Student, Departament «Radioelectronic Technology of Information Systems», Siberian Federal University (Krasnoyarsk). E-mail: sharshavin@mail.ru А.S. Kondratiev - Senior Lecturer, Departament «Radioelectronic Technology of Information Systems», Siberian Federal University (Krasnoyarsk) А.V. Grebennikov - Ph.D. (Eng.), Associate Professor, Head of Departament «Radioelectronic Technology of Information Systems», Siberian Federal University (Krasnoyarsk)

The problem of ranging code pseudorandom noise (PRN) is a special case of analog to digital conversion problem in the digital signal processing. This problem is well known and has an effective solution by the special signal spectrum pre-limitation method. In tins ar- ticle the possibility of application of this method to correlator reference PRN former based on direct digital synthesis. The spectrum limitation is obtained by inclusion the special block in which detects the PRN transitions and playbacks the transient process at these moments. The PRN generation method by the transient playback from memory allows considering this former as increased frequency rate digital filter with downsampling and obtaining spectrum limitation degree through equivalent digital finite impulse response filter calculation. The former hardware implementation is performed on VHDL hardware description language and packed in IP core. The former verification has made on laboratory model with FPGA and DAC. The model time and frequency diagrams confirm justifiability of proposed method.

 

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