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首页> 外文期刊>Optical engineering >Range ambiguity resolution technique applying pulse-position modulation in time-of-flight scanning lidar applications
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Range ambiguity resolution technique applying pulse-position modulation in time-of-flight scanning lidar applications

机译：在飞行时间扫描激光雷达应用中应用脉冲位置调制的距离模糊度分辨技术

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摘要

Time-of-flight (ToF) range measurements rely on the unambiguous association of each received echo signal to its causative emitted pulse signal. This definite association is difficult when measuring long ranges at a high repetition rate, resulting in ambiguous range measurements. While methods and algorithms exist to overcome this fundamental problem of ToF measurement techniques like radar these may not be directly applied to lidar without adaptations. Especially, in airborne laser scanning, up to now it was a requirement to strictly avoid range ambiguities during data acquisition. We present a new method for resolving range ambiguities fully automatically in scanning lidar, enabling measurements exceeding the maximum unambiguous measurement range by far. As a theoretical foundation of our approach, we introduce a specific model of the lidar transmission path (i.e., emitter-target-receiver) accounting for the time-variability of consecutive measurements. Based on this model, we discuss the influence of intentional variation of the intervals between pulse emissions on the intervals of successively received echoes and delineate an algorithm for automated, definitive association of pulse emissions and their resulting echoes. Simulation results indicate a probability of incorrect associations of ＜10~(-5), which we positively proved by applying this technique to real-world scan data.
机译：飞行时间（ToF）范围的测量依赖于每个接收到的回声信号与其引起的发射脉冲信号的明确关联。当以高重复率测量远距离时，这种确定的关联很困难，从而导致距离测量不明确。尽管存在克服诸如雷达之类的ToF测量技术这一基本问题的方法和算法，但如果不进行修改，可能无法将其直接应用于激光雷达。特别是在机载激光扫描中，到目前为止，在数据采集过程中必须严格避免范围​​模糊。我们提出了一种新的方法，可在激光雷达扫描中完全自动解决范围模糊问题，从而使测量范围远远超过最大明确范围。作为我们方法的理论基础，我们介绍了激光雷达传输路径（即发射器-目标-接收器）的特定模型，该模型考虑了连续测量的时变性。基于该模型，我们讨论了脉冲发射之间的间隔的有意变化对连续接收回波的间隔的影响，并描述了一种自动，确定性地将脉冲发射及其产生的回波关联起来的算法。仿真结果表明，错误关联的概率＜10〜（-5），我们将该技术应用于现实世界的扫描数据已得到了肯定的证明。

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