FLIGHT and Mission OPERATIONS – Network Overview
This section describes the SCAN Testbed Mission Operations phase.
The Ground System consists of the CoNNeCT Control Center (CCC), the CoNNeCT Experiment Center (CEC), the Ground Verification Facility (GVF), and the external ground systems and their interfaces located at the Huntsville Operations Support Center (HOSC), White Sands Complex (WSC), and Wallops Ground Station (WGS). The NASA Integrated Services Network (NISN) is the network that connects these entities. Other ground stations beyond WGS may also be used during operations, including White Sands 1, or user supplied ground stations. However, WGS is currently the baseline station and was used for operations planning and link analysis.
The SCAN Testbed and Ground System send and receive commands and
data, and manipulate (stores, routes, and processes) data. The Flight
System and Ground System interface with external systems to send
and receive RF signals to and from space. The RF signals carry commands
and data between the two CoNNeCT elements. The Ground System provides
terrestrial control of the Flight System through the CoNNeCT Control
Center, a top-level schematic of the Ground System is shown in Figure
SCAN Testbed uses two paths for communicating to the ground (Figure
2) – primary and experimental.
SCaN Testbed has line-of-sight connection to NASA’s Space Network (Tracking Data Relay Satellites) and compatible ground stations or other space nodes (e.g., Cubesat).
Primary Communication Path
There are two communication paths for the CoNNeCT mission. The primary
communications path (commanding and telemetry) will exist through
the ISS link. This link will be coordinated through the Marshall
Space Flight Center (MSFC) Huntsville Operations Science Center (HOSC).
The HOSC will receive the data from the SN and forward it to the
Glenn Research Center (GRC) CoNNeCT Control Center (CCC) through
The second communication path (commanding and bidirectional data) is the experimental link with the SN and the NEN. In the future the SCAN Testbed will have the capability to use this link to send non-critical commands through the SDRs to the Avionics. This link will be scheduled directly by the CCC with the supporting elements. This link includes S-band and Ka-band services to the Space Network and S-band to the NEN. Users will coordinate their ground station use with the CCC.
• Forward Link: GRC CCC through NISN Near Earth Network to White Sands to TDRSS to SCAN Testbed.
Downlink: SCAN Testbed to Ground Station (e.g. WFF) through NISN Near Earth Network to GRC CCC.
CoNNeCT Control Center (CCC)
The CCC is the Mission Operations CoNNeCT Control Center. It will reside within the TSC and will make use of the existing TSC interfaces to the HOSC. The CCC will use the TSC data network, which is an isolated network from the GRC campus network. The TSC facility located at GRC allows payload developers and scientists on earth to monitor and control experiments onboard the International Space Station (ISS).
CoNNeCT Experiment Center (CEC)