Re: [Discuss-gnuradio] samp_rate in GNU Radio

[PRIYANKA PRIYADARSHINI]

Hi,

Thank you for your response, I got your point. But I need to know this:

I want to receive a GPS L1 signal (1575.42MHz) and I studied that the local oscillator of RTL-SDR has the intermediate frequency of 3.57MHz-4.57MHz. So when the signal with this IF goes to ADC of SDR, I want my ADC to sample this incoming signal at a sampling rate of 38.192MHz (as per the requirement). But when I try to put this sample rate in RTL-SDR, it starts dropping samples. I want to know that is there anything am I doing wrong OR it is the limitation of my RTL-SDR.  

Thank you.

On Mon, Apr 9, 2018 at 11:57 AM, Carles Fernandez <address@hidden> wrote:

Dear Priyanka,

According to https://www.rtl-sdr.com/about-rtl-sdr/ :

The maximum sample rate is 3.2 MS/s (mega samples per second). However, the RTL-SDR is unstable at this rate and may drop samples. The maximum sample rate that does not drop samples is 2.4 MS/s, however some people have had luck with 2.8MS/s and 3.2 MS/s working well on some USB 3.0 ports.

Thus, something between 2.0 and 2.4 MS/s would work for you.

Maybe this paper could be of your interest, although it is a little bit outdated: 

http://www.cttc.es/wp-content/uploads/2013/09/Turning_TV_into_GNSS_Rx1.pdf

Hope this helps,

Carles

On Mon, Apr 9, 2018 at 11:38 AM, PRIYANKA PRIYADARSHINI <priyankapriyadarshini081@gmail.com> wrote:

Hi,

I am trying to receive GPS signal using RTL-SDR with GNU Radio. I am interested in L1 band of GPS signal (1575.42MHz). But I am confused about my sampling frequency. What value should I choose as samp_rate in RTL-SDR block of gnuradio? 

Thank you

Priyanka

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