MID QUESTIONS

RADAR SYSTEM
1.  Write short notes on:

(a)  Aperture illumination and efficiency of radar antennas.

(b)  Loss in gain of cosecant squared antennas.

(c)  Beam steering of phased arrays.

(d)  P - Scope display.

2.  (a)  Explain the characteristics of a cross-correlation receiver with a block diagram.

(b)  Describe and differentiate between active ECM and passive ECM.

3.a)   Explain   the   need   of   subtractor   circuit   and   full   –   wave   rectifier   in  delay   line cancellers?

b)    Explain the ‘butterfly effect’ of moving targets on A-Scope display.

4.a)   What are the advantages of monopulse radar over conical scan radar?

b)    Explain   the   block   diagram   of   amplitude   comparison   monopulse   for   extracting

error signals in both elevation and azimuth.

5.a)   Write   notes   on   various   antenna   parameters   and   their   significance   as   applicable

to radars.

b)    Explain and distinguish between the branch-type and balanced duplexers.

6.a)   Describe and distinguish between the different types of ECMs directed against a radar.

b)    Discuss   the   relations   between   the   matched   filter   characteristics   and   correlation

function.

WIRLESS

1. (a) What is the principal application that has driven the design of circuit switching network.

    (b) Distinguish between static and alternate routing in a circuit switching network.

2.  (a) What is the importance of color codes in CDPD?

    (b) Draw the wireless application protocol (WAP) layered protocol architecture?

3. (a) What is wireless transaction protocol (WTP)? Mention the features of WTP.

    (b) Discuss the WTP formats.

4. (a) Give the WAP example network. Explain in detail.

    ( b) List the entries of mobile IP and describe data transfer from a mobile node to a xed node and  vice versa.

5. (a) Mention the salient feature of TDMA

(b) Consider global system for mobile, which is a TDMA / FDD system that uses

25 MHz for the forward link which is broken in to radio channels of 200 KHz.

If 8 channels are supported on a single radio channel and if the guard band is

Assumed,  and the number of simultaneous users that can be accommodated in

GSM.

     (b) Consider global system for mobile, which is a TDMA / FDD system that uses25 MHz for the                       forward link which is broken in to radio channels of 200 KHz.            

     If 8 channels are supported on a single radio channel and if the guard band is

Assumed, and the number of simultaneous users that can be accommodated in

GSM.

6. (a) Explain about the ARQ mechanism using s flowchart with neat timing diagram?

     (b) What are the different logical data channels?