[FOSS-GPS] IF raw data sampling

[Burak a]

Hello All,

I am new to the GPS and this community. I want to implement a GPS-SDR and
do the acquisition phase in FPGA. According to the my first glance I found
out SoftGNSS by Mr. Akos, MATLAB code.

In his implementation, he had 3-bit digital data fed through the processor
but not I-Q demodulated in the implementation of parallel code phase
acquisition algorithm. In his implementation, the input data is multiplied
by sinus signal to achieve I, cosine signal to achieve Q and then they
forwarded to the FFT block. However, there are a lot of COTS GPS front-end
ICs and they have 1/2 bit I and Q signals.

But for a GPS front-end I already have I and Q signals. So, what should I
do with those I and Q data? Should I multiply both of them with sine and
then feed through the FFT block? Does it make sense?

Thanks in advance,

*Mehmet Burak AYKENAR*
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