System Architecture Design

pSHIELDSystem Architecture DesignPUthe direction up and downwith the value either ±2G or ±6G. When the Sunspot is at rest, itmeasures x = y = 0 and z = 1G• Light sensor isof the type TPS851, designed by Toshiba. The sensor can measure the voltagebetween 0.1V (dark) - 4.3V (light), and converts the voltage to the brightness ofLuminance (lx) 3Software components: SUN SPOT JVMSquawk isopen sourceand has been written in the Java programming language. It is a virtual machine,and is a highly portableJava VM. The advantageof Squawk is that it can run on bare metal instead ofbeing run on top of theoperating system. This means that applications canbe isolated and be treated asapplication objects. This allows multiple applications running on the same virtual machine. Squawk alsosupports CLDC 1.1 that facilitates connectivity tomobile phones.3.2.2 Power NodeThe Power Node is a rugged embedded system, providing high computing power, optimally designed interms of dimensions, weight, powerconsumptionn and capable to work in harsh environmental conditions.The reference application contextt is defence/ /aerospace ground mobile and airborne environments,addressing manned and unmanned applications where reliable high performance computing is required.The Power Node is a pSHIELD SPD Embedded System Device. It is a physical component that offersnative SPD features at different abstraction levels: hardware, firmware, network and operating system.The native support ofSPD features and the high level of standard adopted, in terms of hardwarearchitecture and operating system, make it readyto host middleware and overlay services.The node offers low level native SPD capabilities, which are available as hardware components, hardwareinterfaces, firmware functionalities and network functionalities.Figure 9 – Power Node pSHIELD component.The node hardware capabilities arefocused on security, dependability andcomposability. These featuresare provided by the architecture of the node, by the hardwarecomponentsavailable onit, by its hardwareinterfaces, by the firmware and by the compliance with MIL standards. Thefeatures include:PUD2.3.2Issue 5Page 33 of 122