Recording Gps Data (Ii) - di-GPS Eco ProFessional 2 User Manual

RECORDING GPS DATA (II)

Each satellite broadcasts a digital message that contains two types of information. The first type is
ephemeris data, which includes the assigned serial number of the satellite, the status of the satellite
(healthy or faulty) and the current date and time. The other type is almanac data and it includes
precise orbital position of every satellite in the system.
At the initial stage, ECO PF-2 GPS needs all these data for position fixing. It usually takes a minute to
a few to receive all data. An open sky outdoor environment will enable faster data acquisition while a
longer time will be required under an environment with weak signals. By introducing the EASY™
function in ECO PF-2 GPS, time needed for reacquisition of data is shortened to only a few seconds
even in weak-signal environment once the GPS receiver is locked to the satellite.
EASY™ stands for Embedded Assist System, which is a function for quick positioning. ECO PF-2 GPS
will calculate and automatically predict the single emperies (up to 3 days) when it is turned on.
Predicted information is saved into memory and used for positioning if not enough information is
obtained from the satellites. This can tremendously improve the receiver's positioning performance
in weak-signal environment.
For the EASY™ function to work properly, the ECO PF-2 GPS will need to collect enough information
from the satellites beforehand, which will take less than 2 minutes. Please let the GPS on for 1-2
minutes after the first fix during the first use or after not using for 3 days to allow collection of all
necessary data from the satellites.
As power is needed to sustain the internal memory, ECO PF-2 GPS should be connected to the camera
at all times to prevent the loss of ephemeris data. Memory backup capacitor in ECO PF-2 GPS can
provide about two-minute power to the internal memory during short disconnection from camera or
changing of camera battery. Consuming only a very small amount of energy, the internal memory will
not affect the battery life of the camera.
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