Читать книгу Position, Navigation, and Timing Technologies in the 21st Century - Группа авторов - Страница 137

As we move from a world which is driven by human intelligence to a world driven by machine intelligence, the need for more reliable and pervasive 3D geolocation becomes critical. GPS is a critical enabler of this machine‐driven world; however, it has also become clear that it has severe limitations indoors and in urban areas where the laws of physics cannot be extended further, and the GPS system needs to be augmented in order to satisfy all the applications that this world requires. The Metropolitan Beacon System represents this new class of augmentation techniques and is designed to be the lowest‐cost, most scalable technology that delivers highly reliable PNT across its footprint.

Figure 39.22 Representative z‐axis walk test result at a multi‐storied hotel.

Figure 39.23 The KML snapshot shows the 2D error performance.

The technology has been standardized in global telecommunication standards such as 3GPP/OMA, the spectrum in the United States has been perfected for multi‐lateration purposes, and the technology has been licensed by Tier 1 chipset and server providers and demonstrated to be best in class. It is on the cusp of commercial availability, enabling a host of new applications around Mobile, 5G, Internet of Things, and driverless cars and drones.