VLBI with GNU Radio and White Rabbit

on YouTube ↗28m

" summary

Claims that White Rabbit can serve as a VLBI reference over a 169 km link with timing better than 1 nanosecond and frequency stability close to a hydrogen maser at VLBI timescales. Uses GNU Radio with USRP X310/X300 hardware, a homegrown VDIF block, SpecRack for high-rate recording, and two-bit quantization to reduce ~12.8 Gbps streams to ~256 Mbps. Demonstrations produce real fringes against Effelsberg and Westerbork; current flowgraph runs at about 1/5 real time and RFNoC FPGA work is partial but promising.

AI-written summary · about

" chapters (6)

1. 0:00Start
2. 1:53Very Long Baseline Interferometry
3. 3:31What Do You Need
4. 4:12Complex Cross Correlation
5. 6:01Radio Telescope
6. 10:23Spec Rec Spectrum Recorder

" related talks

• 19mHomebrew Long-Baseline Interferometry (LBI) For Education and ResearchStephen Wang · GRCon 2020
• 01h 02mHacking the Wireless World with Software Defined Radio - 2.0Balint Seeber · Black Hat Europe 2014
• 27mGNU Radio in a Direct-RF WorldTravis Collins · GRCon 2020
• 53mHacking the Wireless World with Software Defined Radio - 2.0Balint Seeber · Black Hat USA 2014
• 01h 00mHacking the Wireless World with Software Defined Radio - 2.0Balint Seeber · Black Hat Asia 2015
• 20mDesigning a Narrowband Radar using GNU Radio and Software Defined Radio for Tomography....Victor Cai · GRCon 2020
• 05mDemonstration of GNU Radio High Data Rate BPSK 10 Mbps Modem Real-Time with ...David S. Miller · GNU Radio Conference 2021
• 31mNI: New Capabilities for Comms, Radar, & EW with an SDR-based Research PlatformHaydn Nelson, Abhay Samant · GNU Radio Conference 2021