Editorial Advisory Board PNT Q&A

January 9, 2019 - By GPS World Staff

What is the “sweet spot” for high-precision multi-GNSS receivers, factoring cost, capability and robustness: processing of 2, 3 or 4 GNSS constellation signals?

Miguel Armor

“Users expect an available GNSS position in the most demanding environments, making the combination of all constellations and frequencies the real sweet spot. The benefits of using all constellations and frequencies is very important and will only increase in the future.”
Miguel Amor
Hexagon Positioning Intelligence

Terry Moore

“Combining frequencies is a way of removing the impact of ionospheric disturbances. Some new GNSS signals such as Galileo E5 are so high-quality that the solution degrades when they are combined with lower quality signals on other frequencies. We must now use other, novel, approaches to remove the ionosphere disturbances.”
Terry Moore
University of Nottingham

Brad Parkinson

“Four constellations are now virtually free, and incorporated into new, inexpensive GNSS phone chips. A more complex issue is using all frequency bands. Benefits are enormous. With volume, costs will plummet. So, the sweet spot moves to use of all frequencies, particularly L5 and equivalents.”
Bradford W. Parkinson
Stanford Center for Position, Navigation and Time