RF recordings of GPS SVN49 broadcasting non-standard codes

This dataset consists of several recordings of the L1 signal broadcasted by GPS<br> SVN49 between 2019-06-26 and 2019-06-28. This satellite broadcasts a<br> non-standard code as its L1 C/A signal, where the usual spread-spectrum PRN is<br> replaced by a PRN which consists of alternating zeros and ones (akin to a square<br> wave subcarrier). This produces strong spectral lines at +/-511.5kHz from the L1<br> centre frequency. The signal is modulated with a navigation message in the usual way using 50baud<br> BPSK. The recordings have been made with a LimeSDR using an external 10MHz GPSDO and a<br> small and inexpensive GPS patch antenna. <strong>Included files</strong> The .bin files contain waterfall data generated with STRF. This<br> data can be used to identify the satellite producing the signal using Doppler<br> measurements. The mjd58660.dat file contains Doppler measurements extracted with STRF. The .c64 files are IQ recordings of the upper sideband of<br> the modulation (centred at L1 + 511.5kHz). One of them is done at 5ksps and<br> another at 10ksps. The timestamp of the start of each recording is indicated in<br> the filename. The format is complex IQ data as 32-bit floats.