Following on from our last post where dewdude showed how to decode DGPS signals, Frank K2NCC has uploaded a video on YouTube showing DGPS decoding in action. In his video Frank uses an Airspy plus ham-it-up upconverter, a Sirio discone antenna and for software he uses SDR# with audio piped into MultiPSK for decoding.
In the video you can clearly see the decoded DGPS messages showing the pseudorange corrections and station numbers. To decode DGPS with MultiPSK you will need to use the paid version which costs approximately $50 USD, however in the free version the DGPS will run for 5 minutes each time MultiPSK is opened before expiring.
Below is an example of a decoded message.
24/03/2015 02:06:09 Message type : 9 (GPS partial correction set) Station number : 172 (Appleton WA USA 300.0 Khz TXID 871 100bps) Z-count : 4215 ( 42 mn 9.0 s ) Sequence count : 2le factor=0.3) Sat. ID|SF|UDRE|Pseudorange corr. |Range rate corr.|IOD|CRC 25 |0 |1-4m| -7.68 m | 0.000 m/s |62 |OK 31 |0 |1-4m| 1.54 m | 0.000 m/s |27 |OK 32 |0 |1-4m| 0.70 m | 0.000 m/s |99 |Error