Specifications

FASTER Engineering Model
62
connection s are used to send the state vector (which in addition to position and attitude
data store also a reference time and the magnetic field components) to the EPIA EN15000
throughout the User Datagram Protocol (UDP). The UDP uses a simple transmission
model and is often used in time-sensitive applications because dropping packets is
preferable to waiting for delayed packets which may cause the system to not properly
work.
Parallel port controls the camera shooting mode, sending an electric impulse which
substitutes the pressure of the shutter button, and acquires the camera arm switch position
which enables image acquisition. The XPC Target real time operative system is installed
on a 512 Mb Compact Flash card on the back side of the board. A picture of the board
with its mechanical drawing is shown on Figure 52.
Figure 52:Advantech 3353 PC104+ board and mechanical drawing [Ref. (31)]
The GPS receiver is a Garmin 18x 5Hz (Figure 53), an OEM high-sensitivity GPS
sensor for use in guidance applications where a more frequent update of position and
velocity (instead of 1 Hz) can improve the measurement accuracy and trajectory
reconstruction, especially when coupled with high frequency devices like the inertial units
(100-500 Hz) in a Kalman filter estimator.
It has a 12-parallel-channel and is WAAS (Wide Area Augmentation System) enabled
so it is possible to use in Europe the EGNOS (European Geostationary Navigation
Overlay Service) differential correction in order to get a typical accuracy in position
determination < 3 m and of 0.1 kts RMS steady state [Ref (32)]. It is connected to the
PC104+ data logger via a RS232 serial connection at 38400 bps (8 data bits, 1 stop bit, no