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AWR1843BOOST: AWR1843 Objects, Clusters & Tracked Objects

Sam Ref
Expert 1610 points
Part Number: AWR1843BOOST
Other Parts Discussed in Thread: TIDEP-01021

Hello,

 

We are beginners in using AWR 1843 Boost.

 

  • Q01

Usually a typical BW of the chirp signal used in USRR is ~4GHz (resulting in range resolution ~3.8cm). I guess that means starting frequency of the chirp is 76GHz. Correct?

On the other hand, usually a typical BW of the chirp signal used in MRR/LRR is ~100MHz (resulting in range resolution ~1.5m). What is a typical starting frequency of the chirp is case of MRR/LRR?

 

  • Q02

When, or under which circumstances, do we use Bursts within a sub-frame? What is a typical (or a common) number of bursts in that case?

 

  • Q03

Within one of the reference designs of AWR-1843 (Design Guide: TIDEP-01021 Beamsteering for Corner Radar Reference Design) it is stated that can we can track up to 24 objects. Does this mean we have 24 clusters? If not what is the relation between clusters and tracked objects?

 

  • Q04

What TI calls an object in the context of Radar is not necessary a real object. Correct? A chair for example is a real object but it can be defined using several TI-Radar objects and may be using several TI-Radar clusters. Correct?

 

  • Q05

After you address the above questions would you please send us a TI reference that defines clearly the relationship between; (1)Cloud points, (2)Objects, (3)Clusters & (4)Tracked Objects. The relationship between these 4 entities is unclear to us.

 

Regards,

Sameh

 

  • 0
    TI__Mastermind 31680 points

    Hello Sameh,

    Please find the answers to some of your questions below:

    Q1. The start frequency for USRR is 77GHz, while for SRR/MRR, it is 76GHz.

    The configurations are defined in the following paths: (You can confirm this yourself as well)

    mmWave Sensors\Automotive toolbox\labs\Medium Range Radar\CCS Project\common\mrr_config_chirp_design_x.h

    mmWave Sensors\Automotive toolbox\labs\Short Range Radar\CCS Project\common\srr_config_chirp_design_x.h

    Q2. Bursts and subframes are a part of the Advanced frame configuration. In this configuration, users can configure multiple type of frames compared to legacy frame configuration where only one type of frame is permitted. You can configure different types of sub-frames here (upto 4) which can consist of multiple bursts and chirps. So to summarize, the purpose is to give the user the flexibility to program different kinds of chirp configuration based on usecase. 

    To answer your question, there is no typical number of bursts as such, it all depends on the user as to how they want to implement their usecase. You can also refer to the mmWave_DFP_user_guide.pdf which comes as a part of the DFP Package. (\mmwave_dfp_<version>\docs)

    Hope this helps, will get back with answers for the rest of your questions in the coming 1-2 days

    Regards,

    Ishita

  • 0 in reply to Ishita Kochar
    Expert 1610 points

    Dear Ishita,

    Please choose an example/demo from the TI demos where bursts are used. Please explain to us in that example; (1)how many chirps/burst are used & why? (2)how many bursts per sub-frame are used & why?

    Regards

    Sameh

  • 0 in reply to Sam Ref
    TI__Mastermind 31680 points

    Hello Sameh,

    For example you can take the SRR demo. There, we have used two sub-frames, one for SRR and one for USRR applications. SRR sub-frame consists of two kinds of chirps (fast chirps and slow chirps), whereas USRR subframe consists of two alternating chirps (utilizes one of the two TXs). Please refer to this document to understand the design and intent on the above configuration.

    Regards,

    Ishita

  • 0 in reply to Ishita Kochar
    Expert 1610 points

    Thank you Ishita

    Can you please address our other queries urgently? 

    Regards

    Sameh

  • 0
    TI__Guru 69990 points

    Hello Sameh,

    Answer3: no. of Cluster and tracker are not always mapped one to one. If you refer this doc-https://www.ti.com/lit/ug/tidud36b/tidud36b.pdf?ts=1603273537227&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTIDEP-0092

    For the SRR algorithm, the clustering output is used as the basis for the input to the tracking algorithm. The strongest object in the cluster is provided as the representative object to the tracking algorithm. The intention here is essentially reduce the number of objects provided to the tracking algorithm and introduce hysteresis, so that the trackers only track strong reflectors, and do not switch between adjacent reflectors.

    Same statement is applicable for MRR lab as well.

    Answer4: basic objects is no. of different reflection from same physical object (like chair). These objects/reflections are then clustered based on neighborhood and SNR.

    ANswer5: There is no specific document to explain relation among these parameters. But you can refer few mmWave SDK documentations

    C:\ti\mmwave_sdk_03_05_00_01\packages\ti\alg\gtrack\docs\Tracking radar targets with multiple reflection points.pdf

    Regards,

    Jitendra

  • 0 in reply to Jitendra Gupta
    TI__Genius 12670 points

    Hi Sameh,

    You may also find the following document helpful for understanding how localization is done in the group tracking algorithm: https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/1023/Tracking_5F00_radar_5F00_targets_5F00_with_5F00_multiple_5F00_reflection_5F00_points.pdf