How come all these radar's and sonic waves on the highway aren't jamming everybody up.

Discussion in 'Prime Main Forum (2017-2022)' started by I'mJp, Feb 4, 2017.

  1. I'mJp

    I'mJp Senior Member

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    Now days there are at lot of makes / model with dynamic cruise control, and with those sonic sensor's around the girth of the vehicle.

    In radar are there multiple frequencies ? Have unique id codes ?
    Is there a frequency allocation for different car vendors ?
    Polarization ?

    A transmitted ultra sonic wave has to be more powerful than a reflected one.

    How is it that we don't jam each other up ?
     
    #1 I'mJp, Feb 4, 2017
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  2. huskers

    huskers Senior Member

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    I hear it is causing people to have their hair fall out. We will all be bald in 18 months.
     
    #2 huskers, Feb 4, 2017
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  3. I'mJp

    I'mJp Senior Member

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    I was really wondering if a ddrc in one vehicle , while passing you (with your ddrc), does not create a reflection that makes you car dramatically slow down ?
     
    #3 I'mJp, Feb 4, 2017
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  4. Lee Jay

    Lee Jay Senior Member

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    They use one or another version of multiplexing. Code division and time division are the easiest to understand.
     
    #4 Lee Jay, Feb 4, 2017
  5. I'mJp

    I'mJp Senior Member

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    So is there a industry standard allocation ?

    Government oversight ?

    Testing ?
     
    #5 I'mJp, Feb 4, 2017
  6. Lee Jay

    Lee Jay Senior Member

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    There's a frequency allocation, but they all share it. They can all be on the same frequency without interfering with each other, just like cell phones can.
     
    #6 Lee Jay, Feb 4, 2017
  7. Tideland Prius

    Tideland Prius Moderator of the North
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    The radars are ok but I think the sonar sensors are affected by the presence of other sonar sensors (e.g. if you're parking and the car in front of you is reversing and has parking sensors, your front sensors may be unhappy from the interference. It's mentioned in the owner's manual).

    For radar, I just assumed they programmed it to ignore anomalous propagation.
     
    #7 Tideland Prius, Feb 5, 2017
  8. bwilson4web

    bwilson4web BMW i3 and Model 3

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    • 340 m/s - speed of sound
    • 300,000,000 m/s - speed of light
    About six orders of magnitude difference as long as everyone is using pulse distance measurement.

    Bob Wilson
     
    #8 bwilson4web, Feb 5, 2017
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