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MMWCAS-RF-EVM: detection range

Yuichi Morita
Intellectual 345 points
Part Number: MMWCAS-RF-EVM
Other Parts Discussed in Thread: AWR2243

Tool/software:

Hello,

In User's Guide, Radar spec related with detection range is not written.
Please tell me detection range in each RCS and show me evaluation result if it possible.

Regards,

Yuichi

  • 0
    TI__Mastermind 20605 points

    Hi Yuichi-san,

    I am not sure about which user guide you were pointing to. You can refer to the following document to get more information about range with respect to the radar equation and other parameters.

    www.ti.com/.../swra553a.pdf

    Regards,

    Kaushik

  • 0 in reply to Kaushik Gowda
    TI__Mastermind 20605 points

    I believe for the cascade EVM, the max range spec is given considering the RCS as described.

    You can refer to the following document for more information on that.

    Imaging Radar Using Cascaded mmWave Sensor Reference Design (Rev. A) (ti.com)

    Regards,

    Kaushik

  • 0 in reply to Kaushik Gowda
    Intellectual 345 points

    Hello, Mr./Ms.Kaushik,
    Thnak you for introducde the information.

    The data presented in this design guide was obtained
    using MMWCAS-RF-EVM Revision C, that used the
    AWR1243P devices.
    I want to know the spec the latest MMWCAS RF-EVM Revision D makes use of the second generation, AWR2243 devices.

    Please tell me the difference of the detection range between the MMWCAS-RF-EVM Revision C and Revision D.
    and introduce the document about Revision D, it there are.

  • +1 in reply to Yuichi Morita
    TI__Mastermind 20605 points

    Hi,

    We do not have a similar characterization done with the AWR2243 device-based cascade EVM but the numbers should be easily met by the AWR2243 as well. (Also, the AWR1243P was not productized). 

    Please find the feedback below on the thumb rule to obtain SNR improvements for cascaded cases:

    • The SNR improves as 10*log10(Number of simultaneous TX * Number of RX) for a given number of chirps. This is true for all MIMO modes. 
    • When we cascade N devices, assuming we do TDMA, then only the number of RX chains is scaled and not the number of simultaneous TX. So, for TDMA, the SNR benefit is just 10*log10(Number of cascaded devices). 
    • For DDMA, it will be 10*log(N^2) or 20*log10(N) since both (number of simultaneous TX and RX) scale with number of cascaded devices (N). 
    • Now, the third case (beam forming) is somewhat complicated. Since the beam is narrowed, this modulation requires more chirps to complete the scanning. So, the benefit in SNR is not as high as DDMA. Returns on beam forming reduces if the FOV to be scanned is large.
    • The improvement in NF and TX power between the two devices (in dB scale) would remain the same independent of number of devices.
    • Increase in SNR directly correlates to increase in max range.

    Now, between the 4-Chip 2243 and the 4-Chip 1243P, you should be able to identify the max specs based on your use case by considering the points above and the differences in system parameters as per the datasheet.

    Regards,

    Kaushik