COLD and WARM start
C
OLD
S
TART
When the batteries are first inserted and the device activated
outdoors, it will seek out satellites and download informatio
n. This “Time To
First Fix” will typically take up to 5 minutes, but can take considerably longer
(possibly up to 30 minutes) in poor conditions.
Note that if the device is
unused for several months a cold start may be required even if the batteries
are left in.
W
ARM
S
TART
This will usually take 2 seconds in an optimum clear sky. New
satellite data is downloaded on an incremental basis.
Conditions and accuracy
The accuracy of the device will depend on the conditions in which it is
operating. “Good conditions” means that the device can “see” most of the sky,
and satellites are positioned for optimal triangulation.
Accuracy can be affected by buildings or trees which can block satellite
signals, but is not affected by weather conditions or cloud cover.
DRS CENSE uses a cutting edge GPS chip, the Fastrax UP500. The key
GPS receiver specifications are:
General:
L1 frequency, C/A code (SPS)
14 independent tracking channels
Update rate: 1 fix/s (user configurable, up to 5 fix/s
Accuracy:
Position:
1.8m (CEP95)
Sensitivity:
Acquisition (cold):
-146dBm
Navigation:
-159dBm
Tracking:
-159dBm
Protocol:
NMEA 0183, 9600 baud
Chip set:
MediaTek MT3318
DRS CENSE specifications
Accuracy:
Better than 5 metres
Battery life:
15 hours continuous with supplied high quality alkaline batteries
Weight:
115g
Dimensions:
87 x 70 x 26mm
Operating temp: 0 to +40
C
Display update: 1Hz (once a second)
Storage temp:
-10 to +40
C
Cold start:
Typically <5 minutes depending on conditions
Warm start:
Usually 2 seconds in an optimum clear sky
Environmental: Splash proof
Colour:
White
DRS CENSE is subject to continuous improvement leading to changes in this specification
DRS Data Services Limited, 1 Danbury Way, Linford Wood, Milton Keynes MK14 6LR, England
Tel: +44(0)1908 666088
Fax: +44(0)1908 607668
enquiries@drs.co.uk
www.drs.co.uk
