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11.2. Precaution and limitation of using /developing GPS Assist
function
■GPS Assist function Effect
To fully demonstrate GPS Assist function effect, it is required to capture 4 GPS satellites.
There are some cases that cannot fully demonstrate the effect under condition that cannot
capture or hard to capture the GPS satellites.
■GPS cold start
To start GPS positioning, there are hot start using satellite data of last time, warm start and
cold start when you cannot use positioning data of last time.
GPS assist function is a function to demonstrate effect in cold start. It does not have effect to
reduce TTFF in hot start and warm start.
■Setting time
It uses time information to simulate GPS satellite position. So it is necessary to set the system
time accurately.
■Downloading EPO data
EPO data validity period is 30 days. But as the GPS assist function effect is higher by using new
data, so please re-download the EPO data by 1 week as a guide.
■EPO data delivery server
BT-2000 can download EPO data by internet from EPSON EPO data delivery server.
When you cannot use internet or using GPS assist function by local internet, copy EPO data
from EPSON data delivery server and place at local internet.
To set EPO data delivery server in BT-2000, write delivery server URL at "internal
storage\agps\agps.conf".
■GPS assist function API
BT-2000 GPS assist function API is using EPSON own API.
To develop an App using GPS assist function, install SDK provided by EPSON and use EPSON
own API.
MOVERIO Pro Developer's Guide (Rev.1.4)
187
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