CloudACM – Page 10 – Autonomous Computational Machines

GPS Mapping with Viking using ESP-Now and GPSd

December 22, 2022 Patrick Gilfeather

The last post (https://www.cloudacm.com/?p=4185) ended with a video titled “Decoding GPS using an RTL SDR Receiver” that was posted August of 2020. The 2 software requirements for this method are RTKLIB (https://www.rtklib.com/rtklib_tutorial.htm) and GNSS-SDRLIB (https://github.com/taroz/GNSS-SDRLIB). The video mentioned that Google Maps didn’t display, however there was mention in comments about an API requirement. The video did introduce the option to port the output to another mapping program, one of which is Viking. On a side note, I found this video…

SDR Data Processing

November 29, 2022 Patrick Gilfeather

In the last post, https://www.cloudacm.com/?p=4136, there was a lead in on the topic of capturing the data from SDR hardware using GQRX. This post was also mentioned, https://www.cloudacm.com/?p=3209. In this post, these topics will be revisited with some greater detail and enhancement. The first item covered here will be IQ data captured using GQRX. When using GQRX with SDR hardware, it’s not always convenient to view the data live. This has been the case during my field work, with the…

Radio Frequency Visualization

October 28, 2022 Patrick Gilfeather

This post will revisit a topic which has been covered in earlier posts, but with some enhancements. This earlier post used python to visualize a radio sweep, https://www.cloudacm.com/?p=3209. The method was specific to the SDR hardware and the rtl_power command to generate a dataset that was then processed with python to generate a plot. This post will expand on the visualization by using python to generate varied plot types to help in understanding the radio signals observed. The previous post…