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AWR1243BOOST: Link Budget Analysis

Anum Pirkani
Expert 2005 points
Part Number: AWR1243BOOST
Other Parts Discussed in Thread: AWR1243

Hello,

I am doing the link budget analysis for the TI radar using another radar as a receiving source. TI radar in my test case is placed at around 35m from the receiving radar.

However, the power budget analysis at the receiver side shows a much stronger received signal from the TI AWR1243 board than I expected.

With the transmitting antenna gain of TI = 10dBi, Transmitted Power of 12dBm, Receive antenna gain of receiving radar of 10dBm, at 35m, I should expect power from TI radar approx -60dBm. However, the power I am getting is approx -33dBm. I don't have any nearby transmitting sources and the test case is an outdoor experiment scenario.

Is there any obvious reason I am missing here?

Many thanks for the help

Anum

  • 0
    TI__Guru 58035 points

    Hello Anum,

    Is the receiver antenna gain etc. also accounted for? I am trying to understand the intent of the experiment , are you trying to confirm the transmit power from AWR1243 ?

    Regards,

    Vivek

  • 0 in reply to Vivek Dham
    Expert 2005 points

    Hello Vivek,

    Many thanks for your response.

    I am actually trying to calibrate my receiving radar in the presence of interferences received from several other radars (from various manufacturers/ and distances etc.). The link budget I perform works fine for 2 other radars, but somehow in the case of TI radar, the signal I receive is much stronger than my expectation and calculation. So I just wanted to know if I am using the correct Tx antenna gain (10dBi) and power fed to the antenna (12dBm) for the TI radar.

    Kind Regards

    Anum

  • 0 in reply to Anum Pirkani
    TI__Guru 58035 points

    Hello Anum,

    Yes, you are using the right antenna gain and Tx o/p levels. This is for single TX. Do you have one TX ON at a time or multiple TX ON? If multiple TX are ON there would be a beam forming gain.

    Regards,
    Vivek

  • 0 in reply to Vivek Dham
    Expert 2005 points

    Oh I get it...!!! so probably this might be the reason. Yes, I had multiple transmitters on. 

    What would be the beamformed gain in this case. With 3 Tx on?

    Regards

    Anum

  • 0 in reply to Anum Pirkani
    TI__Guru 58035 points

    It depends on the phase alignment of each of the TX antennas and how they interfere with each other. But in best case you can get about 9dB beam forming gain with 3 Tx.

    Regards,
    Vivek