Pseudolite Alternatives for Alternate Positioning, Navigation, and Timing (APNT)

The Federal Aviation Administration (FAA) has initiated an APNT program to research various alternative strategies that will ensure that the PNT services necessary to safely, securely, and efficiently support the US National Airspace Systems’ (NAS) transition to the Next Generation Air Transportation System (NextGen) will be ensured. This paper discusses the Pseudolite Alternative, one of a number of alternatives being examined to determine how best to maintain the safety, security, and efficiency of the NAS in the event of a loss of Global Navigation Satellite System PNT services. It examines different methodologies for implementing this alternative and discusses the pros and cons of each. Most importantly, it examines how the Pseudolite Solution can work in tandem with other APNT alternative to mitigate risk to all NAS users when they are no longer able to rely on GNSS area navigation. INTRODUCTION: Overview of the APNT Pseudolite alternative, its benefits and challenges, and how it can contribute to the overall APNT