Magellan MobileMapper CX Getting Started Guide - Page 75
Recording Data for Post-Processing - office 2 1
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English Recording Data for Post-Processing There is one additional rule for optimizing MobileMapper CX accuracy when recording rover data that will be differentially corrected by MobileMapper Office in post-processed mode: All features must be logged while the receiver is continuously tracking at least 5 satellites with a PDOP less than 4 for at least 20 minutes. You need to record only a single "epoch" of GPS data to get a position, but you need to record at least 20 minutes of data to post-process it for sub-meter accuracy. All features recorded within a 20-minute portion of a job file will be correctable to submeter accuracy. For example, if you record a job over a one-hour period and lose lock on (i.e. fail to continuously track) the available GPS satellites at Minute 20 and Minute 40, all of the features in this job were recorded during a 20-minute period of continuous GPS signal lock, and so all can potentially be post-processed for submeter accuracy. But if you record a 60-minute job and lose lock at Minute 20, Minute 30 and Minute 40, any feature recorded between Minute 20 and Minute 40 may not be sub-meter because they were recorded during 10-minute periods of continuous satellite tracking. Without knowing a lot of other factors, it is hard to say how accurate a feature recorded during a 10-minute period of continuous lock will be, but it will be more accurate than a realtime corrected position. IMPORTANT! Only the SBAS mode can be used while recording raw data to let MobileMapper CX deliver real-time DGPS positioning. 67