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Homework Help: Radar question

  1. Jul 28, 2016 #1
    1. The problem statement, all variables and given/known data
    An experiment probes a coherent process and the receiver is coherent. The autocorrelation function and the spectral density function are estimated and transformaed into atmospheric parameters. See Table 1 below

    1) Calculate the maximum velocity (in m/s) that may be represented by the spectral density function.

    2) What is the minimum difference in velocity that can be resolves by this system ?

    3) 500 m resolution is archieved by using 13 bit Barker code. What is the pulse length ?

    Tabel 1.

    PRF [Hz] 1200
    No. of coherent
    integrations 32
    Resolution [m] 500
    Lag resolution [ms] 24.6
    Nr of bits in code 13
    Maximum lag [s ] 25
    Operating frequency 45

    2. Relevant equations

    v = f*λ (1)

    3. The attempt at a solution

    How can i do this when i don't know the wavelength ? Should i suppose that the maximum velocity is the speed of light ?

    How can i know the minimum velocity here ?

    What should i do here ?

    I dont know were the black lines comes from ? <Moderator's note: [s ] was interpreted as a BB code>
  2. jcsd
  3. Jul 28, 2016 #2


    User Avatar
    Science Advisor
    Gold Member

    The maximum velocity is related to the resolution and sampling properties of the signal and of the computed quantities (like PSD).
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