GNSS‐SDR 1

Symbol Encoding

GNSS-SDR requires the 2bit packed symbol to be in 'Sign-Magnitude Adjusted' format, however Peter Monta's original verilog code produces 'Offset-Binary Adjusted' format.

Symbol	Offset-Binary Adjusted	Sign-Mag Adjusted
	Original Firehose	GNSS-SDR
-3	00	10
-1	01	11
+1	10	00
+3	11	01

The steam format definitions are from ION GNSS Metadata Standard

The encoding can be changed by editing two files, quantize.v and histogram.v.