RADAR SYSTEM & NAVIGATION(paper no. 2) by SURESH KUMAR.....sureshkumarthegreat@yahoo.com

RADAR SYSTEM & NAVIGATION

PAPER NO. 2

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                                               ECE
                               RADAR SYSTEM & NAVIGATION
                                  (B.Tech 6th/7th Semester, 2121)
Time : 3 Hours                                                                                        Maximum Marks : 60
NOTE:- This paper consist of Three Sections. Section A is compulsory. Do any Four questions from
                 Section B and any two questions from Section C

                                     Section-A                                         Marks : 20

1(a) Enlist the factors that determine the detection range of a radar.
(b) State the Doppler effect. HOw is it used for radar applications?
(c) Sketch the block diagram of FM-CH radar.
(d) What is staggered PRF? Explain.
(e) How does an active electronic counter measure reduce the detection range of a radar?
(f) What are the possible erroes in direction finding in radar systems? Explain.
(g) Give the different acquisition search patterns for tracking radar.
(h) Explain the pulse comparison monopulse technique for tracking.
(i) Enlist the characteristics features of an actual radar systems.
(j) How does integration of radar pulses improve the detection performance of a radar? Explain.

                                              Section-B                                          Marks:5 Each

2. Consider an S-band pulsed radar with the following parameters:
            Peak transmitted power = 300kW.
            Pulse width = 1 user.
            PRF = 600Hz.
            Antenna radius = 6ft.
            Transmitted frequency = 3000MHz.
            Transmit loss = 6dB.
            Antenna efficiency = 0.95
    Calculate the maximum signal power at the range of 50 nauticals miles.
3. An altimeter using FM has a modulation frequency of 200 Hz. and a frequency excursion of 60 MHz. Calculate the
    modulation slope which will result in a range quantization of 10 KM.
4. Consider a radar with multiple PRF ranging using f₁ = 13.770 kHz and f₂ = 14.580 kHz. Calculate the need of multiple
    PRF.
5. Write a brief technical note on an actual radar system.
6. What are Electronic Counter Measures? Desrcibe a typical adopted for this measure.

                                               Section-C                                        Marks : 10 Each

7. With the help of a blosk diagram, explain the working of a conical scan tracking radar.
8. Discuss the blind speed situation in an MTI radar. Derive the formula for blind sppeds for the case of a single delay
    line canceles. In a five pulse stragger (four periods) in a long range airtraffic control radar, the periods are in the ratio
    25 : 30 : 27 : 31. How many times the first blind speed would became as compared to that of a constant PRF waveform
    with the same average period.
9. Discuaa instrument landing System in detail.

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