Btech final year RADAR systems question paper

                Btech final year RADAR systems question paper

                                                April-2011
                                                ECE                                                   SET-1

1. Explain the principle and process of binary moving window detector.
2.  (a) Explain how the radar is used to measure the direction and postion of target.                                 (b)What are the peak power and duty cycle of a rada whose averag transmitter power is 200 W, pulse width of 1microsec and a pulserepetition frequency of 1000Hz ?
3. What are the peak power and duty cycle of conical scan tracking radar.                                            (b) why does a tracking radar have poor accuracy at low elevation angles ?
4. (a) Explain how a threshokd level is selected in threshold detection?                                                    (b) how to find the number of pulses that returned from a point target as the radar antenna scans through its beam width?                                                                                                                     (c) Why most of the radar recivers are considered as envelop detectors while calculating the SNR?
5.  (a) Draw the structures of balanced dupleser during transmission and reception modes.                       (b) list out the merits and demerits of phased array antennas.
6. (a) what are various unwanted signals whichwhich causse errors in FM altimeter?                               (b) Explain the two frequency CW technique for measuring the radar range.
7. (a)  what is the doppler effect ? What are some of the ways in which it manifests itself? What are its radar applications?                                                                                                                            (b) find the relation between bandwidth and the acceleration of the target with respect to radar.
8. (a) An MTI radar is operated at 9 Ghz with a PRF of 3000pps. Calculate the first two lowest blind speesa for this radar. Derive the formula used.                                                                     (b)Discuss the limitations of non-coherent MTI radar systems.