DRDO developed Arudhra AESA radar inducted in IAF

Discussion in 'Indian Defence Forum' started by Laughing_soldier, Jun 3, 2011.

  1. tvsram1992

    tvsram1992 SENIOR MEMBER

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    we already have our asea radars
     
  2. amardeep mishra

    amardeep mishra FULL MEMBER

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    Man! gosh,so much mis-information! this is not the indian designed arudhra! it is israeli ELTA-2084 known as "MPR" among IAF circles!Secondly the israeli radar has an instrumented range of 460kms whereas indian arudhra has a max range of 400kms against a 2m^2 target
    now this is our "indigenously designed arudhra",look how different it is from the israeli variant-
    Our arudhra also features advanced DBF for the first time in india.DBF essentially means that you have got A/D converters attached to every radiating element(digital receiver) providing impressive control over every beam!
     

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  3. Water Car Engineer

    Water Car Engineer ELITE MEMBER

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    [​IMG]
    [​IMG]
    [​IMG]

    Arudhra S-band 4-D SURVEILLANCE RADAR

    [​IMG]
    [​IMG]
    [​IMG]

    Ashwini S-band 4-D SURVEILLANCE RADAR
     
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  4. amardeep mishra

    amardeep mishra FULL MEMBER

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    @Oscar
    To explain my point as to how exactly is this DBF is different from beam forming in analog domain(characteristic of rajendra and various other 90s era chinese/russian phased array design philosophy)-
    as you can see in the picture,in ABF,you have got received echo signal(coming from every element of phased array) mixing with Rf(carrier freq).This ABF can feed upto 4 channels(pair of receiving antenna).Normally this is downconverted to IF range and subsequently digitized by our good old A/D.

    Now DBF is slightly different in the sense-DBF can be realized all the way down to single element level.As you can clearly see,in DBF architecture(first time used in arudhra and ashwini radar system),every single element has got itz own A/D converter and mixing +downconverting to IF stage and subsequent digitization is carried out at individual antennae element! Noise and distortions are de-correlated by using this simple equation- y(k)=(1/N)summation(s(n)*e(n+k)) where n varies from 0 to N-1.The value of "k" or delay(for which y(k) is maximum or above a certain threshold) gives out the presence of "known" signal(target) in echo.(This technique is also employed in sonars).This operation is usually done through a matched filter that inherently maximizes SNR
    This obviously is more demanding and complex vis-a-vis simpler ABF.here are some of the advantages-
    (a)Enhanced controlability of multiple beams
    (b)improved dynamic range
    (c)better and faster power management(i.e capability to control amplitude and also phase)- this feature helps a lot in ECCM
    PS- the picture below is just for reference
     

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  5. StormShadow

    StormShadow BANNED

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    I'm asking you again...do you work for RCI/ASL?
     
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  6. amardeep mishra

    amardeep mishra FULL MEMBER

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    @Oscar

    this is how correlation is performed-
    Here y(n) is the correlated output of x(n) and t(n),y(n) achieves maxima at somewhere between 50 and 60- meaning that the known signal t(n) has strong presence in unknown echo(x(n)) at roughly between n=50 and 60 - hence it also confirms the presence of target at a distance of cn/2

    That is confidential,however i can say you this that i have dealt with ground based radars(rajendra at BEL to be precise) during my intern(although my specific branch is electronics and control systems) and i dont work for either RCI or ASL!i love them(signal processing aspect) more than anything else on this planet- and i am not kidding!
    PS- Again,this picture below is just to elucidate the concept of correlation in digital domain and doesnt have anything to do with actual radar(either arudhra and ashwini system)
     

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  7. StormShadow

    StormShadow BANNED

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    Ok fine..but please..I have seen some "confidential info" being spilled out by you(not in this thread). That's why I was concerned.
    BTW...are you aware of the new project first of it's kind in asia...whose test was also done recently...? I cannot directly mention it here but the name of the project goes by one of the characters in Ramayan.
     
  8. kurup

    kurup ELITE MEMBER

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    I have read some of your posts and all of them highly informative .

    I hope the details you are giving out are openly available and you are not divulging any confidential data .
     
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  9. Oscar

    Oscar SENIOR MODERATOR

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    @gambit Confirmation of this
     
  10. Nilesh Singh

    Nilesh Singh BANNED

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    Sorry man!!!!!! your post is more of a bouncer to people like us............ can any one explain in plain English what he is trying to say. It looks like you work on these radar technologies but please be careful and not divulge any information which you are not supposed to.:what::what::what::what::what::what:
    But other than that it looks like you can provide lot of Knowledge on the forum.............
     
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  11. ni8mare

    ni8mare FULL MEMBER

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    nothing is classified......DBF is tech like ABF.....
     
  12. Nilesh Singh

    Nilesh Singh BANNED

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    .....DBF is tech like ABF.....[/QUOTE]
    :crazy::crazy::crazy::crazy::crazy::crazy::crazy::crazy::crazy:
     
  13. greatone

    greatone FULL MEMBER

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    Is there any export potential for any of our radars developed in-house ?
    And if so, who might be possible buyers ?
     
  14. Omega007

    Omega007 SENIOR MEMBER

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    The Viets may be,and South American republics.
     
  15. Lord Of Gondor

    Lord Of Gondor FULL MEMBER

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    Indonesia has already purchased Battlefield Surveillance RADAR's(BFSR) manufactured by BEL and so did Sudan.

    Indonesia Buy Two Battlefield Radar from Bharat Electronics - Indonesia Business News
     
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