IWR1443BOOST: i need helps about fundamentals of mmwave range estimation

user4535726

Prodigy 90 points

Part Number: IWR1443BOOST
Other Parts Discussed in Thread: IWR1443

hello i have some problem about mmwave sensor

already i learned TI trainning of 'fundamentals of mmwave sensor'.

i wondering about range estimation. i want show the example about estimate the distance from rader to object

please show me the example about range estimation

ex)

Thank you listening

over 8 years ago

0 Raghunandan Kamath over 8 years ago

TI__Mastermind 22155 points

Hello Jung,

You can go through the mmwave-training-series for all the training required on rqange estimation, velocity estimation, angle estimation etc.

Hope this is helpful for your understanding.

Happy Learning!!!

Thanks,

Raghu

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0 user4535726 over 8 years ago in reply to Raghunandan Kamath

Prodigy 90 points

HI, Thank you for your answer

already i watched the trainning videos and reviewed the documents

but i don't understand about fundamentals

now i want to know two solution to the below:

1. The resolution of mmwave sensor ex) iwr1443

- i want show the example that use picture and sample data

2. 1st - range estimation

2st - velocity estimation

3st - angle estimation

- i want understand about above 3steps

So, i want to know about 3types estimation using sample data (ex. The distance (rader to object) is 15mm , The range resolution is 0.5mm)

already i studied the mmwave sensor but don't understood about mmwave sensor operation because i don't goot at the mathmatics

so, i want yours help thank you..

0 Former Member over 8 years ago in reply to user4535726

Hello,

1. The range resolution is largely determined by the chirp sweep bandwidth. Since the IWR1443 supports a 4 GHz sweep bandwidth, the resolution can be determined from equation (9) as shown in The fundamentals of mmWave:

Resolution = c/(2B) where c is the speed of light and B is the bandwidth.

Then for the IWR1443: Res = 3E10 [cm/s] / (2*4E9 [1/s]) = 3.75 cm

2. Have you been able to study The fundamentals of mmWave? There is an explanation of all three measurements beginning on page 3. If you could review it and let me know which sections or equations in the document are not coherent for you then I could perhaps provide more clarity for those sections.fundamentalsmmwave.pdf

0 user4535726 over 8 years ago in reply to Former Member

Prodigy 90 points

Thank you very much for your reply..

I studied the document that attatched in you reply letter

but don't understand many contents because i don't good at mathmatics..

so please help for me step by step

now start the first question;

Please Show the pdf file Page.4

the equation4,

1. why the time delay () is that?

2. show the figure4;

why is the S is constant frequency value? and that is what?

3. the equation 5

0 = 2 what's the meaning of 0 ..

and equation step 5 to 6 to 7 don't understand

and λ is first appear what is the λ that's very wonder..

My questions is too many.

so sorry and thank to you please help me.

I try to understood but failed please help me step by step of the fundamentals

Thank you verry much

0 Former Member over 8 years ago in reply to user4535726

Hello,

Some quick answers to your enumerated questions:

1) You are probably familiar with the equation distance = velocity * time. Eq (4) is the same equation rearranged where the distance is from the antenna to the target and back so 2d. The speed at which electromagnetic waves travel in air is c, the speed of light. This gives t = 2d/c

2) St is the difference in frequency of the TX chirp and the RX chirp. It is constant since the chirp frequency changes linearly with time.

3) phi is the symbol for phase

4) To go from Eq (5) to (6) substitute in t=2d/c to give phi = 4*pi*f*d/c.

Recall the relationship between frequency and wavelength: c = λf.

Substitute in to arrive at phi = 4*pi*d/λ. (6)

Eq (7) is the general equation for a sine wave as a function of time.

5) λ is the symbol for wavelength.

I think the best progress can be made by instead reviewing more fundamental concepts related to electromagnetic wave theory and general radar principles before moving on to mmWave fundamentals. I've compiled some resources to get you started. From top to bottom they go from more general physics to radar specific.

There is a lot of other good literature so please don't limit yourself to the list below. If after pursuing these and other resources you have subsequent questions specific to mmWave radar principles please start a new topic.

Happy learning,

Amanda