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Session D4: PNT Situational Awareness: Operations

The CONEMP for the SDA On-Orbit SA GNSS Terrestrial Monitoring System for Tranche 1
Gregory Weaver, SDA/JHUAPL, Ed Powers, SDA/Aerospace Corp., Somdatta Nath, General Dynamics Mission Systems
Location: Room 6-8
Date/Time: Monday, Jun. 3, 4:45 p.m.

The concept of employment (CONEMP) for the Space Development Agency (SDA) Position, Navigation, and Timing (PNT) Situational Awareness (SA) function of the Tranche 1 Transport Layer (T1TL) is to provide space-based observations of Global Navigation Satellite Signals (GNSS), and provide near-real time, global terrestrial interference data to a community of Combatant command/Services/Agencies (C/S/A) through the SDA interface into the DoD Unified Data Library (UDL). SDA anticipates that these C/S/A are preparing to process and disseminate the SDA PNT SA information. The Data Exploitation and Enhanced Processing (DEEP) PNT system of the USSF Joint Task Force – Space Defense and the Electromagnetic Spectrum Operations (EMSO) of Joint Commercial Operations (JCO) is one such opportunity. Ideally, the use of the PNT SA data will enhance the GNSS awareness layers of C/S/A tactical EMI visualization tools, and alert / notification systems.
For the SDA PNT SA function, the use of the term GNSS is confined to the following signals: · US GPS L1C/A · ESA Galileo E1 · US GPS L2C · US GPS L2P · US GPS L5 ESA Galileo E5
The GNSS data returned by the SDA PNT SA function for these signals is required as follows: · GNSS Automatic Gain Control State · GNSS Carrier to Noise Density Ratio · GNSS Carrier Doppler frequency · GNSS Carrier phase measurements · GNSS Pseudorange measurements · GNSS Tracking Status · GNSS Navigation Messages · GNSS PVT solution.
The GNSS data returned by the PNT SA function (PNT SA data) will be pervasive and global in that the reporting of observables by each of the 126 SVs of the SDA T1TL constellation will be continuously flowed by the SDA Unified Planning Environment and Resources for NEBULA Operations – Vendor Agnostic (SUPERNOVA) by the SDA Operations Centers (OC’s) into the UDL. The continuous flow by SUPERNOVA is enabled by the optical mesh of the SDA Network, Established Beyond the Upper Limits of the Atmosphere (NEBULA) communications backbone.
In addition to the pervasive, global return of PNT SA data just described, the SDA PNT SA function also provides the capability for spectrum capture of L-band signals that may emit from terrestrial interferers.
The spectrum capture data will be returned in the form of In-phase / Quadrature (PNT SA I/Q data) digitally sampled signal representations. The period of sampling for the PNT SA I/Q data is configurable and constrained by the number of GNSS bands being simultaneously observed. The PNT SA I/Q feature is designed for the C/S/A to request into the SUPERNOVA operations on either a schedule basis, or on-demand given by the pertinent mission authority. The SUPERNOVA will operate PNT SA I/Q requests by prescribing a terrestrial area of regard and duration (e.g. latitude N-S, longitude E-W for UTC (DOY, 100h to 1300h).
This presentation to the JNC will provide further detail about the SDA SA CONEMP to promote use of the SDA SA data return by the emerging DoD SA community of interest for processing for battlefield operations in GPS degraded conditions and direct to warfighter information systems.

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