An echolocation model for range discrimination of multiple closely spaced objects: transformation of spectrogram into the reflected intensity distribution.
An echolocation model for range discrimination of multiple closely spaced objects: transformation of spectrogram into the reflected intensity distribution.
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用于区分多个紧密间隔物体的距离的回声定位模型：将频谱图转换为反射强度分布。
DOI：
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发表时间：
2004
影响因子：
2.4
通讯作者：
M. Yano
中科院分区：
文献类型：
--
作者：
I. Matsuo;K. Kunugiyama;M. Yano
利用调频回声定位，蝙蝠可以辨别物体的范围，精确度不到一毫米。然而，蝙蝠的回声定位机制还没有被很好地理解。通过对回波频谱的分析，可以确定三个或更多近距离物体的延迟间隔。然而，由于在没有关于回波的干涉图案的时间变化的信息的情况下无法确定延迟间隔的顺序，因此不能仅使用回波频谱来适当地将延迟时间与对象相关联。为了说明这一点，使用了载波频率与蝙蝠发射扫频兼容的高斯啁啾。对象1 t1的延迟时间可以从开始时间附近的回声频谱估计。通过将t1加到对象1和对象2之间的延迟间隔(从第一次出现的干扰效果中提取)来获得对象2的延迟时间。通过同样的过程，可以按顺序定位更多的对象。当所有物体位于延迟间隔的30微米以内时，该模型可以确定三个或更紧密间隔的物体的延迟时间，精度约为1微米。该模型适用于具有不同反射强度和噪声环境(0-分贝信噪比)的目标的距离分辨，而互相关法很难应用于这些问题。
Using frequency-modulated echolocation, bats can discriminate the range of objects with an accuracy of less than a millimeter. However, bats' echolocation mechanism is not well understood. The delay separation of three or more closely spaced objects can be determined through analysis of the echo spectrum. However, delay times cannot be properly correlated with objects using only the echo spectrum because the sequence of delay separations cannot be determined without information on temporal changes in the interference pattern of the echoes. To illustrate this, Gaussian chirplets with a carrier frequency compatible with bat emission sweep rates were used. The delay time for object 1, T1, can be estimated from the echo spectrum around the onset time. The delay time for object 2 is obtained by adding T1 to the delay separation between objects 1 and 2 (extracted from the first appearance of interference effects). Further objects can be located in sequence by this same procedure. This model can determine delay times for three or more closely spaced objects with an accuracy of about 1 micros, when all the objects are located within 30 micros of delay separation. This model is applicable for the range discrimination of objects having different reflected intensities and in a noisy environment (0-dB signal-to-noise ratio) while the cross-correlation method is hard to apply to these problems.
影响因子：
2.4
作者：
SAILLANT, PA;SIMMONS, JA;DEAR, SP
通讯作者：
DEAR, SP
DOI：
10.1073/pnas.95.21.12647
发表时间：
1998-10-13
影响因子：
11.1
作者：
Simmons, JA;Ferragamo, MJ;Moss, CF
通讯作者：
Moss, CF