There isno conceptual or technological difference between FFF and FDM. The acronym “FDM” is trademarked by Stratasys, and the company retains the sole right to use that name for its products. However, the actual technology described by “FDM” can be built by any manufacturer, just as long...
With multi-antenna synchronized global navigation satellite system (GNSS) receivers, the single difference (SD) between two antennas is able to eliminate both satellite and receiver clock error, thus it becomes necessary to reconsider the equivalency problem between the SD and double difference (DD) ...