So using multiple references minimizes the need to be absolutely certain that all of the modes of the system can be reasonably well excited from only one reference location.

所以，利用多参考点就减少了绝对性把握的要求，这个要求是仅从一个参考位置就可以相当好地激起系统的所有阶模态。

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Resultsfrom a single-zone system show that the shape of the potential profile is determined by anode location and its level by the setting ofthe reference electrode.

结果表明，单区阴极保护系统辅助阳极位置决定船体表面电位曲线的形状，参比电极影响曲线电位值的大小。

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"Our biggest challenges were developing an algorithm which optimally combines the data from GPS and the other sensors, and overcoming the issues of using such low-cost sensors in a system without any absolute location reference, " said Smithson.

ENGADGET: Cambridge Consultants develops indoor tech to pick up where GPS drops off