Demonstration of GNU Radio Compatibility with a NASA Space...
summary
Claims that a GNU Radio SDR implemented on a Dell laptop with a RTL‑SDR dongle receives a NASA vendor modem at a 1.2 GHz IF and recovers a 15‑bit repeating pattern using BPSK and QPSK. The implemented flowgraph uses polyphase clock sync, a Costas loop (order 2 for BPSK, 4 for QPSK), and an adaptive equalizer and achieves symbol and carrier lock and bit‑stream recovery at data rates up to a couple Mbps in a back‑to‑back coax test. Limitations: only a subset of NASA waveforms tested; PM with subcarrier and full modem functions remain unimplemented.
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chapters (18)
- 0:00Introduction
- 1:13Background
- 2:31Test Configuration
- 3:00Parts
- 3:55Test Case
- 4:32Support Blocks
- 4:53Flow Graph
- 5:14New Users List
- 5:42Clock Sync
- 6:52Adding the Source Block
- 7:21Development Process
- 8:14Test Approach
- 8:42Test Results
- 9:20Frequency Spectrum
- 9:44Before Costas Loop
- 10:19After Costas Loop
- 11:07Conclusions
- 11:42What can we use GNU Radio
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