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osqzss / gps-sdr-sim

Software-Defined GPS Signal Simulator
MIT License
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Getting ephemeris from Ub-blox #239

Open ferorted opened 4 years ago

ferorted commented 4 years ago

I'm trying to obtain a Rinex broadcast ephemeris file to use instead of downloaded brdc.

I record RAWX messages from u-Center (connected to a U-blox MT8 receiver) for one hour. Then I use RTKCONV to obtain the follow RINEX file.

RAW-2.txt

However It is only valid from 18:00 to 18:00h

IMG_20200306_193251

How can I get a file valid for about 2 hour?

Mictronics commented 4 years ago

I'm not familiar with RTKCONV, but from what I found in internet I guess you need to set start and end time manually.

ferorted commented 4 years ago

Hi, I discovered that to obtain efemeris valid for 2h, i have to record more than 1h of data.

Imtiaz08 commented 2 years ago

@ferorted Can you please explain the process of how the spoofing signal is generated once we input our desired coordinates along with a rinex.nav file to the sdr sim? Or if you can provide me some reference material where I can study the whole process.

ferorted commented 2 years ago

Hi, I did my tests using pluto-sdr-sim project by Mictronics (based on gps-sdr-sim project). A Pluto SDR device is required, of course. Now Mictronics has a new project which have some improvement and works very fine, and support HackRF, ADLAM-Pluto SDR devices: https://github.com/Mictronics/multi-sdr-gps-sim

Pay attention to Pluto SDR oscillator. you can find more information in https://www.mictronics.de/posts/ADLAM-Pluto-OCXO-Mod/