Name of the College : SREE CHAITANYA COLLEGE OF ENGINEERING
University : JNTUH
Department : Electronics And Communication Engineering
Subject Code/Name : 07A80401/RADAR SYSTEMS
Year/Sem : IV/II
Website : http://scce.ac.in/web/
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/scce.ac.in/4947-07A80401-RADARSYSTEMS.pdf
SCCE Radar Systems Question Paper
Code No: 07A80401 R07 Set No. 2
IV B.Tech II Semester Examinations,April/May 2012
Electronics And Communication Engineering
Related : Sree Chaitanya College Of Engineering 07A80402 Embedded & Real Time Systems B.Tech Question Paper : www.pdfquestion.in/4946.html
Set No. 1
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions :
All Questions carry equal marks :
1. (a) Explain how the noise is limiting the Radar receiver sensitivity?
(b) What are the collapsing losses? Give the mathematical equation for it, and explain each parameter. [8+8]
2. (a) What is meant by multiple- time-around echoes? When they are obtained.
(b) What types of modulations are used in Radar? Compare them.
(c) What are the various applications of Radar. [6+4+6]
3. (a) Write the short notes on matched filter.
(b) Write the short notes on nonmatched filter. [8+8]
4. (a) Derive the expression for the relative velocity of a target with respect to radar from Doppler frequency.
(b) Explain how the Doppler direction is measured using synchronous two phase modulator? [6+10]
5. (a) Discuss about the internal fluctuation of clutter which limits the performance of MTI Radar.
(b) Describe briefly the analog MTI systems. [8+8]
6. (a) Explain the block diagram of amplitude comparison mono pulse for extracting error signals in both elevation and azimuth.
(b) With diagrams explain Split-range-gate tracking. [8+8]
7. (a) Explain how a multiple frequency CW radar technique is used for the accurate measurement of distance in surveying and in missile guidance?
(b) What is FM altimeter? Explain how it works and what are the applications of it? [8+8]
8. (a) Discuss Radar CRT phosphor characteristics.
(b) Explain about Color CRTs. [8+8]
Set No. 2
1. (a) With block diagram explain MTI radar using range gated doppler filters.
(b) Differentiate blind phases from blind speeds. [10+6]
2. (a) Describe the conical scanning method.
(b) Explain how AGC is achieved in conical scan tracking Radar receiver. [8+8]
3. (a) What is a Radar? How it is used in communications?
(b) Derive the equation for maximum Radar range in terms of radar and target parameters. [8+8]
4. (a) What are the various unwanted signals which cause errors in FM altimeter?
(b) Explain the two frequency CW technique for measuring the Radar range. [8+8]
5. (a) A low power, short range radar is solid-state throughout, including a low-noise RF amplifier which gives it an overall noise figure of 4.77dB.
If the antenna diameter is 1m, the IF bandwidth is 500kHz, the operating frequency is 8 GHz and the radar set is supposed to be capable of detecting targets of 5m2 cross sectional area at a maximum distance of 12 km, what must be the peak transmitted pulse power?
(b) The average false alarm time is a more significant parameter than the false- alarm probability. Give the reasons.
(c) Why post detection integration is not as ecient as pre-detection integration of radar pulses? [8+4+4]
6. (a) Draw the block diagram and explain the operation of a CW Doppler radar using an intermediate frequency in the receiver. How have the drawbacks of the basic CW radar been overcome?
(b) With a (CW) transmit frequency of 5 GHz, calculate the Doppler frequency seen by a stationary radar when the target radial velocity is 100km/h(62.5mph). [8+8]
7. Explain the principle and characteristics of a matched filter hence derive the expression for frequency response function. [16]
8. Why might a double-conversion super heterodyne receiver be used instead of a single-conversion receiver. What limitation might there be in using double-conversion receiver? [16]
IV B.Tech II Semester Examinations,April/May 2012 :
Radar Systems :
1. (a) What is transmitter clutter? How it aects the detection of targets?
(b) Draw the block diagram of CW Doppler radar with nonzero IF receiver and explain each block. [8+8]
2. (a) Explain the basic principle of elementary form of Radar.
(b) Explain how the power received by the radar is related to the radar cross- section? Explain the signicance of each term. [8+8]
3. Explain in detail about Eciency of non-matched lters compared with the matched filter