1. Jul 28, 2016

### Firben

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

1)
How can i do this when i don't know the wavelength ? Should i suppose that the maximum velocity is the speed of light ?

2)
How can i know the minimum velocity here ?

3)
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. Jul 28, 2016

### marcusl

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