IWR1642BOOST: Implementation of "Range Bias and Rx Channel Gain/Phase Measurement and Compensation" with raw ADC data

Hang

Part Number: IWR1642BOOST
Other Parts Discussed in Thread: DCA1000EVM, , IWR1642

Hello,

I was using IWR1642Boost and DCA1000EVM for raw ADC data capturing.

I want to understand how could "Range Bias and Rx Channel Gain/Phase Measurement and Compensation" be implemented for the raw ADC data (not the OOB demo)

I found some useful scripts from this post.

However, I don't quite understand how the parameters for "Range Bias and Rx Channel Gain/Phase Measurement and Compensation" was calculated.

For example, for the OOB demo, by using the measureRangeBiasAndRxChanPhase command, parameters for compRangeBiasAndRxChanPhase could be calculated.

In the case of IWR1642, a range_bias value and 8 pairs of values for 8 virtual antennas are generated.

My question is how can I generated above parameters (the range_bias value and 8 pairs of values) with raw ADC data?

Any theory or equations I can refer?

Thanks a lot!

over 3 years ago

0 Angie Mitchell over 3 years ago

TI__Genius 10730 points

Hi,

Here is an e2e post with just some basic information: https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/918906/iwr6843isk-ods-meaning-of-the-range-bias-and-rx-channel-gain-phase-measurement-and-compensation

I will get back to you with more details on generating the above parameters with raw ADC data.

Thank you,

Angie

+1 Angie Mitchell over 3 years ago in reply to Angie Mitchell

TI__Genius 10730 points

Hi,

Here are some more resources to help:

Documentation on the equations: https://ieeexplore.ieee.org/document/9136646, specifically section VI. This section also refers to some other papers that can be looked at. In that paper, we calibrate the sensor at different angles to improve the accuracy. However, calibrating the sensor at a single point (i.e., boresight) may also be enough for single-chip radars.

As mentioned in the paper, calibration is the effort to compensate for the phase mismatches across antennas due to the HW imperfections within the device (antenna feed lengths, etc.). You will need a reference point reflector (a corner reflector, etc.) in front of the radar. Once you measure the ADC raw data, you can estimate the phase mismatch using the signal model.

A reference code to calibrate the sensor using ADC raw data can be found in the following toolbox:

https://github.com/meminyanik/MIMO-SAR-mmWave-Imaging-Toolbox

The path to the calibration algorithms is: /Algorithms/calibration

Thank you,

Angie

0 Hang over 3 years ago in reply to Angie Mitchell

Intellectual 765 points

Hi Angie,

Thank you so much! That's really helpful!

Best,

Hang

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IWR1642BOOST: Implementation of "Range Bias and Rx Channel Gain/Phase Measurement and Compensation" with raw ADC data