>ggroupsthomas@gmail.com wrote: >>>you can also use multiple pulses, see Whalen's Detection Theory book >> >> >> not in this case, as the OP states it is a CW (continuous wave) radar. >> >Indeed he did. multiple CW? >To going deeper in details, the signal is a QPSK modulated signal of 2 MHz bandwidth. I have to deal with it (PCL...). So, the SNR of the echo (a target) have to be increased (i.e.: the noise power decreased). Thank you very much
Question about reducing noise in a radar receiver
Started by ●February 13, 2006
Reply by ●February 15, 20062006-02-15
Reply by ●February 15, 20062006-02-15
"LPG1976" <gill@gel.ulaval.ca> wrote in message news:m6ydnW-xc-I2Cm7eRVn-iA@giganews.com...> >ggroupsthomas@gmail.com wrote: >>>>you can also use multiple pulses, see Whalen's Detection Theory book >>> >>> >>> not in this case, as the OP states it is a CW (continuous wave) radar. >>> >>Indeed he did. multiple CW? >> > > To going deeper in details, the signal is a QPSK modulated signal of 2 MHz > bandwidth. I have to deal with it (PCL...). So, the SNR of the echo (a > target) have to be increased (i.e.: the noise power decreased). >If it's passive, and you have no control of the illuminating source(s) then you could simply increase the number of receivers ( and receive antennas) or bands that you process (if there are other strong transmissions illuminating your target volume). Almost certainly best to see if you can cheaply improve the receiver noise figure , increase your integration/ correlation time, or optimise your antenna pattern and meet specs first ( as others have already suggested in much more detail). Are you sure it's noise and not interference that is causing your problem ? If so - what type of noise? Best of Luck - Mike
Reply by ●February 18, 20062006-02-18
"LPG1976" <gill@gel.ulaval.ca> wrote in message news:wcidna3g0rcvrGzeRVn-oA@giganews.com...> Hi, > > I have to find a new radar receiver design to increase the SNR. The signal > bandwidth is 2 MHz (a CW Phase modulated signal). With a common receiver > design (receiver BW at 2 MHz too), the SNR is too low for detection. To > increase the SNR, I can reduce the noise power in my receiver by reducing > the receiver bandwidth. Can someone tell me if it's possible to do that > and how (filter bank maybe?). >As someone else asked, is your noise thermal or from something else? If thermal, then you may chill the detector and 1st LNA. What is your current noise figure? Cly
