Earth Image Acquisition
Digital aerial camera control systems for photogrammetric solutions require acquisition and distribution of large amounts of data or the exploitation of the area. One or more specific cameras that are able to produce extreme wide-ground coverage are installed in the fuselage of a plane for aerial photography. The photos are taken from a height of up to 5000 meters and are used for mapping or track surveying, for example. Using special filters in front of the camera, "invisible" factors can be documented - like the chlorophyll content of a corn field made visible in order to determine the amount of fertilizer needed.
A COTS computer delivers the required processing performance and data throughput. The G20 is a CompactPCI Serial system-slot CPU board with an Intel Core i7 dual core 64-bit processor at 2.53 GHz. It comes with state-of-the-art 8 GB DDR3 memory with ECC and a range of front and rear interfaces like DisplayPorts/HDMI, Ethernet, USB, PCI Express and SATA. Four of the PCI Express lanes of the G20 are connected to two XMC modules which are plugged onto separate carrier boards in the system via the backplane. One XMC is used to realize a hardware SATA RAID, the other one is a fiber optic module for data transfer.
What makes using a CompactPCI Serial system in this application attractive is the fact that it is mission-critical. On the one hand, the camera data has to be checked when still in the air because the flights can only take place in good weather conditions. For this, the system has to function reliably at all times. On the other hand, the electronics are subject to harsh environmental conditions regarding temperature, humidity, shock and vibration.
Standard Components Used in this Example
The G20 is a 4HP/3U CompactPCI Serial CPU card supporting USB, SATA, PCI Express and Gigabit Ethernet rear I/O interfaces according to the CPCI-S.0 standard.