Spacecraft INS/CNS/Pulsar integrated Positioning Navigation and Timing

Precision Position, Navigation, and Timing without the Global Positioning System

Time Source Options for Alternate Positioning Navigation and Timing (APNT)

Precise time synchronization is an essential element for APNT technologies, such as wide area multilateration (WAM) and passive pseudo-ranging. The goal is to provide a time service/source that allows APNT technologies to support a required navigation performance 0.3 (RNP 0.3) and provides the navigation integrity and accuracy for surveillance systems that is required for three-mile aircraft se...

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 num...

Autonomous Navigation of the SSTI / Lewis Spacecraft Using the Global Positioning System

The National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC) Flight Dynamics Division (FDD) is pursuing the application of Global Positioning System (GPS) technology to improve the accuracy and economy of spacecraft navigation. High-accuracy autonomous navigation algorithms are being flight qualified in conjunction with GSFC's GPS Attitude Determination Flyer (GAD...

GPS/VISNAV integrated relative navigation and attitude determination system for ultra-close spacecraft formation flying

For the improvement of accuracy and better faulttolerant performance, a global position system (GPS)/vision navigation (VISNAV) integrated relative navigation and attitude determination approach is presented for ultra-close spacecraft formation flying. Onboard GPS and VISNAV system are adopted and a federal Kalman filter architecture is used for the total navigation system design. Simulation re...