FPGA IMPLEMENTATION OF A PSEUDO NOISE SEQUENCE USING CHAOTIC TENT MAP FOR SATELLITE COMMUNICATION

Pseudo Noise (PN) sequences are an integral part of satellite navigation system. In the past few years’ modernization of these systems had led to the addition of new frequency signals or bands such as the L1c and L5 signals thereby necessitating new PN sequences. Chaos based binary PN sequences have been used mainly for cryptographic applications and have not been experimented for other applications. In this paper one such chaos based function namely the Tent map is studied. The Tent map is implemented using shift registers and the output is further modified to obtain optimum correlation values. The correlation properties are studied and compared against Gold sequences. Finally a Verilog hardware description language code is written for implementation on a Field Programmable Gate Array (FPGA) evaluation kit