VIA Technologies EPIA SN-Series Specifications download pdf (Page 98)

FASTER Engineering Model

In this case a surrounding quadrilateral or circular area is drawn around the selected target

area, depending on the shape, and latitudinal and longitudinal boundaries are taken into

account to define where the camera has to be enabled. In this case pilot doesn‟t interact

with system at all. Values are calculated by the FASTER planning software described in

the previous Chapter. More refined control strategies will be implemented in the future,

utilizing also information about the aircraft heading, in order to better fit target areas with

complex form.

The camera arm switch position is acquired reading signals from the parallel port

AND block together with a timing system output which applies the pre-computed time

interval between two images (



), coming from the planning software. If the two values

are both “1” an impulse is generated and transmitted to a Parallel Port Digital Output

block that shots the camera and updates the click variable which counts the number of

acquired images. The click number is used to associate the image to its ancillary data.

The timing subsystem is responsible to control the shot frequency applying the

correct Δt

. The implemented solution is the following:

 A block generates a base function

() 

0  



+  <



+ 1









1  



< 



+  



where < 



 () is used as a reference timing function and is passed into a second logic

AND block which compares it to the output of the GPS sequence counter. If a

valid sequence is available the sequence counter value is 1 else is 0. So a

shooting signal is generated only if a both values are equal to 1. In this case

the reference timing function is reset to 0 as shown in Figure 71.

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VIA Technologies EPIA SN-Series Specifications Page 98

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