摘要：Global navigation satellite systems are all about timing. In a narrow sense, GNSS is technically a matter of how long the satellite signals take to reach a receiver. In a larger sense, it’s about designing global infrastructure systems that may not produce practical benefits for 5, 10, even 15 years or more.
During that time, a lot can happen. Technology changes. Electronics get more powerful and cheaper.
But GNSS equipment manufacturers and receiver designers live in the here and now. They face today’s challenges with today’s technology: how to receive signal indoors, under tree canopy, in urban canyons. How to get the most robust tracking capability out of a receiver — the most accurate, the most available capabilities.
