Combine raw GPS measurements with building outlines, plus some linear algebra, to reduce GPS errors in dense urban environments by 75%.
Tag: gps
Fused LEO GNSS
continuous assured PNT service over ±60° latitude (covering 99.8% of the world’s population) with positioning performance exceeding traditional GNSS pseudoranging would cost less than 0.8% of downlink capacity for the largest of the new constellations, SpaceX’s Starlink. where previous proposals targeted positioning precision on-par with traditional GNSS pseudoranging (on the order of 3 m), fused LEO GNSS can improve on this by more than an order of magnitude to 20cm
GPS Vulnerabilities
jamming has been around for a while, but now there’s also software-based spoofing. given that billions of devices rely on GPS, this is not good.
Realtime 10 cm Location
Global Differential GPS uses a large ground network of real-time reference receivers, innovative network architecture, and real-time data processing software, the GDGPS System provides sub-10 cm positioning accuracy and sub-nanosecond time transfer accuracy anywhere in the world, on the ground, in the air, and in space, independent of local infrastructure.
Radio Occultation Weather
the Constellation Observing System for Meteorology, Ionosphere and Climate (or COSMIC-2), the mission takes advantage of a weird property of GPS radio signals: They actually bend and slow down slightly as they travel through the atmosphere. This bending doesn’t affect the accuracy of navigation on the ground; it’s only visible from the side by something else in orbit. radio occultation, as it’s known, is akin to launching 5000 additional weather balloons every day—that’s how many more measurements the 6 COSMIC-2 satellites will be able to gather.
Millimeter GPS
BeiDou’s current accuracy is ~10 meters compared to the US GPS’s 1 meter. China aims to improve the system 100x that it would be more accurate than the popular American GPS. China is developing ground based augmentation to achieve centimeter realtime accuracy and millimeter accuracy for post processing within cities like Beijing
GPS Goggle
A coming together of sports lens developer Zeal Optics and display innovator Recon Instruments has managed to successfully squeeze both GPS technology and head-mounted display into a set of ski goggles named Transcend. A tiny computer gathers information from a number of onboard sensors and provides location, speed, altitude and temperature information to the wearer via a micro-LCD display inside the goggles. The image from the display is then virtually projected so that it appears out in front of the user.
currently only displays the gps in HUD, and the map offline, but it is a start.
Pulsar Navigation
An interstellar GPS system that has the ability to determine the position of any point in the galaxy to within 1m.
Solipsistic Tourism
The map looks beautiful, the idea is cool, and, within 2 or 3 trips, the GPS device does indeed save money; however, I can’t help but wonder what this might foretell for local economies, all over the world, based on guided tourism. For instance, a small group of American tourists comes through your village, eating PowerBars and looking at handheld GPS devices. They don’t go to any restaurants; they don’t ask any questions of anyone; perhaps they don’t even rent a hotel room. do handheld technologies mean that we’ll soon be digitally replacing the native populations of the Third World, never needing them again for guidance, travel advice, or even insights into medicinal plant life?
No GIS For You!
corrupt lawmakers in the philippines and malaysia rewrite the laws to make sure there is non bottom-up mapping going on that would threaten their sweet deals with loggers and developers.
Gregor J. Rothfuss 