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详细说明： Figure 1 shows a simplified system for location detection. “Reference node” is a static node placed at a known position. For simplicity this node knows its own position and can tell other nodes where it is on request. A reference node does not need to implement the hardware needed for location detection, it will not perform any calculation at all. A “Blind node” is a node built with CC2431. This node will collect signals from all reference nodes responding to a request, read out the respective RSSI values, feed the coll ected values into the hardware engine, and afterwards it reads out the calculated position and sends the position information to a control application. The minimum data contained in a packet sent from a reference node to a blind node shall be the reference nodes’ X and Y parameters. The RSSI value is calculated by the receiver, i.e. the blind node. The main feature of the location engine is that the location calculation can be performed at each blind node, hence the algorithm is decentralised. This property reduces the amount of data transferred in the network, since only the calculated position is transferred, not the data used to perform the calculation. To map each location to a distinct place in the natural environment, a two dimensional grid is used. The directions will, in the following, be denoted X and Y. In all the figures X is defined to be the horizontal direction and Y the vertical. The CC2431 Location Engine can only handle two dimensions, but it’s possible to handle a third dimension in software (i.e. to represent floors in a building). The point named (X, Y) = (0, 0) is located in the upper left corner of the grid. ...展开收缩
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