RF recordings of GPS SVN49 broadcasting non-standard codes

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