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Automotive ultrasonic ranging: Increasing gain may not improve detection distance

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GREAT-Terry
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re: Automotive ultrasonic ranging: Increasing gain may not improve detection distance
GREAT-Terry   7/10/2012 1:43:58 AM
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This is the same in almost all kind of signal chain processing, increasing gain sometimes won't help if the noise in front of the gain stage (including the noise from the amplifier itself) is dominating.

Arun V
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re: Automotive ultrasonic ranging: Increasing gain may not improve detection distance
Arun V   6/19/2012 5:05:07 PM
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Agreed that this is a challenge. To your point, one has to consider many aspects and not just the gain of the signal chain to improve MDS.

Arun V
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re: Automotive ultrasonic ranging: Increasing gain may not improve detection distance
Arun V   6/19/2012 5:03:10 PM
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Agreed and that is the point of this article. A stronger echo (i.e., yelling louder) or large gain in the signal chain may not help detect objects at longer distance. One has to address the noise aspects also to detect objects at longer distances.

WKetel
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re: Automotive ultrasonic ranging: Increasing gain may not improve detection distance
WKetel   6/16/2012 1:32:49 AM
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The minimum detectable signal (MDS) determines the maximum range, and the MDS in turn is determined by the signal to noise ratio,(SNR). Of course the most obvious way to raise the SNR is to increase the transmitted signal. Unfortunately there are often a number of challenges to that approach. Of course there are quite a fewq other ways, but they are mostly not simple and not cheap, and sometimes they don't work very fast, either. Of course, speed is always relative, so it may be that they work fast enough.

cdhmanning
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re: Automotive ultrasonic ranging: Increasing gain may not improve detection distance
cdhmanning   6/15/2012 1:40:05 AM
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There are other ways too. As an example, consider process gain achieved by coded signals. That's used in GPS signals to give many dB of gain and noise rejection. Just yelling louder doesn't help. Remember there are many vehicles out there and if they're all yelling, you still end up not hearing properly.

T.ORR
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re: Automotive ultrasonic ranging: Increasing gain may not improve detection distance
T.ORR   6/13/2012 5:16:36 PM
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Hi Did I miss something - like how do you make it better. A bigger TX signal is about the best method. Regards Tim Orr

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