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AWR1843BOOST: Calculating Max range for a particular RCS and SNR..using mmWave sensing estimator

Part Number: AWR1843BOOST
Other Parts Discussed in Thread: AWR1843, AWR1243

Hi,

I am using mmWave sensing estimator for estimating chirp parameters.I have few queries:

1) Does radar cube size limitation exist in the case when i am just capturing data from AWR1843 using DCA1000?

2)What is the measurement rate in case of AWR1843?How i can calculate it?

3)I am entring range and velocity parameters (corresponding to the chirp parameters set by me) that doesn't give an error in mmWave studio,but when i enter them here, i am getting errors relating to radar cube size and sampling rate.Why is that?

2) Max range calculation is done using the formula in the attached figure as mentioned in one of the answered questions.What is the quantity Nr?Is it equal to num of TX antennas+num of RX antennas?(6 in case i am using 4RX and 2TX antennas).Can you kindly provide a sample calculation for min SNR of 10dB and RCS of 0.01 square meter for AWR1843?

Thanks

  • Hi,

    1. When you capture raw data there is no radar cube limitation but there is still a limitation for the 32kB size if ADC buffer.
    2. Mrasurement Rate should be the frame rate. Ot is defined by user
    3. Select AWR1243 instead of AWR1843. This should resolve the radar cube memory limitation
    4. Nr is the number of virtual Rx antennae.

    Thank you

  • Hi Cesar,

    Thanks for your reply.

    1)Can you kindly elaborate point 4 through an example.For example, if i am using 4 RX channels then Nr will be 4 and it will be 1 if i am using data from 1 RX channel only?What is the significance of "virtual" here?

    2)Does increasing number of TX will increase my max range as per above equation?will it increase the transmit power (i beleive not!)?What will be the effect of increasing number of TX on max range?

    3)Refer your point 1.If there is a limitation on ADC buffer size, then mmwave studio should give me an error if i am violating that limitation.Am i right?I am asking this because i am not getting any error in mmwave studio for my chirp parameters.So, i can assume that i am ok with my configuration?

  • Hi,
     
    In order to understand what virtual means you will need to understand the concept of MIMO. This is an “antenna array” technique used to increase angular resolution.
     
    Please read the following appnote:
     
    MIMO Radar: Section 3 Principle of the MIMO Radar
     
     
    Thank you
    Cesar
     
  • Hi Cesar,

    Thanks for your response. I have read the concept that you mentioned. I am new to this concept so can you kindly vet my following conclusions regarding my setup. In 'static Config' tab of mmWave studio, I have set the channel config as 2 TX and 4 RX. In 'Sensor Config' tab, I have defined a single profile and a single chirp only. However, i have enabled both TX0 and TX1 for current chirp as shown in attached figure.

    1)Does this imply that both TX0 and TX1 will simultaneously transmit the current chirp? In this case, i will not be able to do TDM MIMO as i have defined only a single chirp (it will be a SIMO config). Will transmit power increase in this case as compared to a single TX?

    2) I am working on ADC data from each RX at a time and applying 2D FFT for generating range doppler matrices (as i don't need to separate data of each TX-RX pair as in case of MIMO). Is this approach right or enabling both TX0 and TX1 will have any effect on my processing? Should i only enable one TX in this scenario?

    3) 'Nr' will be 4 in my case as i am using 4 RX without TDM MIMO. In order to achieve this gain, i have to non-coherently sum the 2D FFT matrices from each RX channel?

    Regards

  • Hi,

    Yes in your configuration you will not do MIMO.

    Please search this forum using google site search as follows:

    site e2e.ti.com mmwave studio MIMO

    You should be able to find an example of MIMO configuration with mmWave studio

    thank you

    cesar

  • Hi,

    Ok I will have a look at MIMO example. But as I already mentioned that i am not interested in implementing MIMO right now. I am interested in using it in SIMO config for my application. So it will be of great help if you can kindly answer/vet my queries 1-3 in my previous reply.

    Thanks

  • Hi,

    If you don't want to use MIMO

    1) than you can enable TX0 and TX1 simultaneously. The transmitted power will be higher than if you enable a single Tx

    2) Enabling two Tx simultaneously should not have an effect on your processing

    3) Nr =4, Yes you would have to sum the 2D FFT of the 4 Rx channels

    I recommend you also search this forum using google site search to find more information regarding this topic

    For example here is a search to find threads related to radar link budget

    "site e2e.ti.com radar budget"

    Here is one of the threads found

    e2e.ti.com/.../3526066

    thank you

    Cesar

  • Thanks for clarification. I will also search the forum.