NavSW4NewSpace

Status

Ongoing
Status date

2019-06-12
Activity Code

4C.054

Objectives

The activity addresses the porting of the existing GNSS Software to a COTS based hardware that can be used

for a stand-alone GNSS receiver
as a slide-in module in the COTS version of the On-Board Computer from RUAG Sweden

Challenges

Adaption of RUAG’s existing Navigation Software for Hi-Rel space receivers to the following new constraints:

New baseband processor performing autonomous acquisition and tracking of GNSS satellites as commanded by the NavSW
New hypervisor environment
New processor architecture
Changed real-time constraints (from an interrupt-driven execution model to an event-driven execution model)

Benefits

High level of integration of GNSS receiver into On-Board computer or stand-alone GNSS receiver
Excellent positioning accuracy
Optimal utilization of hardware resources
Low cost
Low power consumption
Low mass
Small size
Quick production and delivery

Features

Acquisition and tracking is performed in hardware (FPGA)
Processor sharing with On-Board computer possible
No extra power supply
GNSS SW capable of processing measurements on the following signals:

GPS C/A on L1
Galileo E1 B/C

Computation of an accurate navigation solution, either a

Kinematic (unfiltered) Least squares solution or
Dynamic Kalman-filtered solution

Optimized footprint and estimated power consumption <7W

System Architecture

The electronics COTS board is an ongoing development by RUAG Sweden featuring a PowerPC for SW execution (possibly shared with the On-Board computer), a FPGA for autonomous acquisition and tracking. Code and carrier phase measurements are computed within the FPGA and are passed to the navigation SW for computation of the navigation solution

Plan

Milestones: