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CC2431-RTR1 数据表(PDF) 5 Page - Texas Instruments |
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CC2431-RTR1 数据表(HTML) 5 Page - Texas Instruments |
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5 / 14 page  CC2431 CC2431 PRELIMINARY Datasheet (Rev. 1.01) SWRS034A Page 5 of 13 2 Location Engine The Location Engine is used to estimate the position of nodes in an ad-hoc wireless network. Reference nodes exist with known coordinates, typically because they are part of an installed infrastructure. Other nodes are blind nodes, whose coordinates need to be estimated. These blind nodes are often mobile and attached to assets that need to be tracked. The Location Engine implements a distributed computation algorithm that uses received signal strength indicator (RSSI) values from known reference nodes, such as mobile neighbor nodes with the same Location Engine, or fixed infrastructure nodes. Performing location calculations at the node level reduces network traffic and communication delays otherwise present in a centralized computation approach. The Location Engine has the following main features: • Three to eight reference nodes can be used for the location estimation algorithm • Location estimate with resolution of 0.5 meters • Time to estimate node location less than 40 µs • Location range 64 x 64 meters • Location error can be less than 3 meters, depending on factors described below • Runs location estimation with minimum CPU usage To achieve the best possible accuracy one should use antennas that have near- isotropic radiation characteristics. The location error depends on signal environment, deployment pattern of reference nodes and the density of reference nodes in a given area. In general, having more reference nodes available improves the accuracy of the location estimation. 2.1 Location Engine Operation This section describes the basic steps required to obtain location estimates from the Location Engine. The Location Engine requires a set of three to eight reference coordinates to be input together with a set of measured parameters. The output from the Location Engine consists of a pair of estimated location coordinates. Before any input data is written, the Location Engine must be enabled by writing a 1 to the enable bit, LOCENG.EN. When the Location Engine is not in use, writing a 0 to LOCENG.EN will reduce the power consumption of the CC2431 by gating off the Engine’s clock signal. Figure 1 shows the basic operation of the Location Engine. |
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