Global Navigation Satellite Systems GNSS Theory and Practice
Mohinder S. Grewal · 2024
Future developments will provide enhanced safety and services for users. Most future users are anticipated to rely on multiconstellation receivers, that is, that will receive and process GPS, GLONASS, Galileo, and Compass signals, complementing and enhancing each other. A GNSS data integrity channel (GIC) will be provided in the next generation of satellites, for example, in GPS, the GPS IIF and GPS III will provide an integrity channel. In addition, next generations will include airborne monitoring by using redundant measurements to provide signal integrity. New satellites to be built and launched will have more frequencies, higher power, and larger bandwidths. These improvements will reduce the errors such as multipath and atmospheric (ionospheric and tropospheric). The support for various services, including Open Service (OS), Commercial Service (CS), Public Regulated Service (PRS), Safety of Life Service (SOL), and Search and Rescue (SAR), will be supported with different signal structures and encoding formats, tailored to each service. Global Navigation Satellite Systems will continue to make the world a smaller, more fully functional planet. Each of the existing systems will individually improve and seek engagement with its neighboring systems to provide a seamless overlay of safe and reliable service around the globe.