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Name of the College : Dasari Jhansi Rani Institute Of Engineering And Technology
University : JNTUK
Department : Electronics & Communication Engineering
Subject Code/Name : R05410404 – Radar Systems
Year : 2008
Degree : B.Tech
Year/Sem : IV/I
Website : djriet.edu.in
Document Type : Model Question Paper

Download Radar Systems Model Question Paper : https://www.pdfquestion.in/uploads/djriet.edu.in/3004-R05410404-RADAR-SYSTEMS.pdf

DJRIET Radar Systems Question Paper

IV B.Tech. I Semester Regular Examinations, November -2008 :
RADAR SYSTEMS :
( Common to Electronics & Communication Engineering and Electronics & Telematics)
Time: 3 hours
Max Marks: 80

Related : Dasari Jhansi Rani Institute Of Engineering And Technology Fluid Mechanics And Hydraulic Machinery B.Tech Question Paper : www.pdfquestion.in/3034.html

Set No. 1

Answer any FIVE Questions :
All Questions carry equal marks :
1. (a) Discuss the parameters on which maximum detectable range of a radar system depends.
(b) Compute the maximum detectable range of a radar system specified below:
Operating wavelength = 3.2 cm
Peak pulse transmitted power = 500 kW.
Minimum detectable power = 10-13 W.
Capture area of the antenna = 5 sq.m.
Radar cross-sectional area of the target = 20 sq.m. [8+8]

2. (a) Describe how threshold level for detection is decided in the presence of receiver noise for a specified probability of occurrence of false alarms.
(b) Describe the effect of pulse repetition frequency on the estimated unambiguous range of radar. [8+8]

3. (a) With the help of a suitable block diagram ,explain the operation of a CW Doppler radar in a sideband super heterodyne receiver.
(b) Calculate the Doppler frequency of stationary CW radar transmitting at 6 MHz frequency when a moving target approaches the radar with a radial velocity of 100 Km/Hour.
(c) List the limitations of CW radar. [5+5+6]

4. (a) With the help of suitable block diagram, explain the operation of a FM-CW altimeter.
(b) Discuss all the possible errors in the measurement accuracy of altitudes using a FM-CW radar. [8+8]

5. (a) What is a delay line canceller? Illustrate the concept of blind speeds based on the frequency response of a single delay line canceller.
(b) Discuss the factors limiting the performance of an MTI system. [8+8]

6. (a) Discuss the effect of surface quality and reflection characteristics of a target on the angular tracking accuracy of a tracking radar.
(b) Describe the phase comparison monopulse tracking technique in a radar system with the help of necessary block diagram. [8+8]

7. (a) Explain the principle behind the operation of duplexers and receiver protectors.
(b) Explain how a circulator can be utilized for a radar receiver protection.
(c) Define noise figure and noise temperature of a receiver system. [5+5+6]

8. Write short notes on the following:
(a) Displays for visual presentation of radar echo signal.
(b) Radiation patterns and feed arrangements for array antennas in a radar system. [8+8]

Set No.2

1. (a) Derive fundamental radar range equation governed by minimum receivable echo power smin.
(b) Modify the range equation for an antenna with a transmitting gain G and operating at a wavelength, . [8+8]

2. (a) Describe the effect of (in terms of wavelength of operation) size of a simple spherical target on determination of radar cross section of the sphere.
(b) What are multiple-time-around echoes? Explain the relation between unambiguous range estimation and multiple-time-around echoes. [8+8]

3. (a) What is Doppler frequency shift? Establish a relation between Doppler frequency shift and radial velocity of a moving target.
(b) Explain how isolation between transmitter and receiver of a radar system can be achieved if single antenna is used for transmission and reception. [8+8]

4. (a) List out the possible errors for measurement of altitudes accurately using a FM-CW altimeter.
(b) Discuss the results of multiple frequency usage for operating FM-CW radar while mentioning the limitations of multiple frequency usage in CW radars. [8+8]

5. (a) What are blind speeds? Suggest a method to reduce the effect of blind speeds for unambiguous detection of a moving target.
(b) Calculate the lowest blind speed of an MTI system operating at 3.6 cm wavelength and transmitting at a pulse repetition time of 330 µS.
(c) Explore the possibility of broadening the clutter rejection null using a second dlay line canceller in the MTI radar system. [5+5+6]

6. (a) With the help of a suitable block diagram, Sequential lobing type of tracking technique in a tracking radar system.
(b) Compare and contrast conical scan and sequential lobing type tracking techniques.
(c) Describe the process of acquiring a moving target prior to tracking it along with the patterns used for acquisition. [5+5+6]

7. (a) Derive the impulse response of a matched filter that is commonly used in a radar receiver.
(b) Describe any two types of duplexers used in radar receivers. [8+8]

8. Write short notes on the following:
(a) Visual displays to view radar echo signals in all types of radar systems.
(b) Applications, advantages and limitations of phased array antennas in radar systems. [8+8]