September 11, 2013
Since our last corner, we’ve celebrated being on Station for a year. And here’s a neat way to further celebrate that milestone: check out these 3 screenshots from a very recent video survey of SCaN Testbed. This includes images of the APS Gimbal, and all the antennas (esp. closeups of Ka-band and S-band MGA).
Since the last Corner, here’s a recap of what we’ve achieved:
• We upgraded and evaluated a new waveform on-orbit for the GD SDR. This waveform has an improved Bit Error Rate (BER) checker.
• Continued on-orbit tests with the Network Services WSC User Services Subsystems – Component Replacement (USS-CR) SGLT 5. The Space Network (SN) Project has implemented the USS-CR Project to free up legacy equipment from two Space-to-Ground Link Terminals (SGLTs) for use as spares. The primary objective of the testing is to provide checkout of configurations supported by the SCaN Testbed project with the USS-CR equipment using the GD radio. SCaN Testbed is supporting the Pre-Level 5 Testing on SGLT 5 SA1 by emulating S-band user (coherent (DG1M1), non-coherent (DG2M2), and transition back-and-forth to test forward, return, and tracking services. This is yet another instance (now 6+) of us providing value to SCaN Network Services.
• Continued on-orbit tests of all our launch waveforms, including experimenting with Harris’ low-end data rate of 300 Kbps.
• Completed TDRS 5 & TDRS 6 antenna characterizations
• Tested large file downlinks with a 650 Mb Harris file. The HRDL rate for SCAN Testbed was set to 6 MBps. The download was successful and took approximately 24 minutes. Thanks again to ops for working with ISS to bump the HRDL rates.
• Ran additional test events for the NEN-LGA Pattern Characterization that we originally ran in March and July, and will continue to run periodically. For those tests, the JPL SDR captured an S-Band ground beacon from the JPL campus.
• Continued on-orbit tests of Sun Tracking Experiment, which characterized the noise temperature of the JPL SDR. The team collected noise power data from the JPL SDR as it pointed towards the sun and as it pointed to dark sky.
• Conducted new set of S-band, GPS, and Glenn, Goddard, TDRSS (GGT) waveform tests. First, we conducted additional GGT testing to obtain power profile for combinations of TDRS Tx power and antennas. Second, the team repeated the open sky sun capture test with MGA at its zenith. Third, the team performed 90 minute GPS captures and provided data to Navsys as input into future decision point for whether to proceed with Phase 2 SBIR.
As for near-term, upcoming events:
What’s also really cool about this upcoming experiment is that all three of our SDRs will have been reconfigured, and this marks the seventh theme/type of reconfiguration (5 waveforms, 2 PAS updates), with dozens of actual reconfigurations (switching between launch / new waveforms, etc.).
• Completing USS-CR testing
• Another round of GD launch waveform and GGT waveform tests
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