Gps Antenna - Headwall Nano-Hyperspec Operation Manual

AIRBORNE PACKAGE

1.2.3 GPS Antenna.

The GPS antenna is used to define the initial location of the Nano-Hyperspec
During the flight the GPS antenna captures the location of the system and sends that data to the IMU and Nano for
inclusion into the data. Within the data capture folders two files identify the GPS data, the Frame Index file and the
gpsMonitor file. To optimize results the GPS antenna should be positioned within 10 cm of the IMU device. The GPS
antenna positional information is also used for triggering the Nano remotely. This is a feature that is useful for flying a
defined polygon pattern. From the start point polygons and patterns are developed to enable the user to set data collection
parameters. The use of polygons and other patterns is found in Section, GPS Configuration and Polygons of this manual.
1-6
Table 1-1. IMU Specifications
Parameter
GPS Update Rate
Horizontal Accuracy Position SPS
SBAS
Vertical Accuracy Position SPS
Velocity accuracy
Start-up Time, Cold start
Re-acquisition
Tracking Sensitivity
Timing Accuracy
Maximum Altitude
Maximum Velocity
Max dynamics GPS
Figure 1-4. GPA Antenna.
Value
4 Hz
2.5 m CEP
2.0 m CEP
5 m
0.1 m/s @ 30 m/s
27 s
< 1 s
-161 dBm
30 ns RMS
18 km
515 m/s
4 g
®
unit once the IMU has been installed.