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SWRA581B–December 2017–Revised October 2018

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Mmwave Radar Device ADC Raw Data Capture

Application Report

SWRA581B–December 2017–Revised October 2018

Mmwave Radar Device ADC Raw Data Capture

ABSTRACT

This application report demonstrates how to interpret raw analog-to-digital converter (ADC) data that is

captured using the Capture Demo or Mmwave Studio. The format of captured raw ADC data is discussed

for different hardware setup respectively. Matlab snippet is provided for engineers who need to develop

custom code for data processing.

Contents

1 Introduction ................................................................................................................... 2

2 Prerequisites.................................................................................................................. 3

3 Viewing and Saving Raw Data Using Capture Demo and CCS....................................................... 3

4 Raw Data Format of Capture Demo Using CCS ........................................................................ 5

5 xWR12xx and xWR14xx With DCA1000 Data Format ................................................................. 7

6 xWR16xx and IWR6843 With DCA1000 Data Format ................................................................. 9

7 xWR12xx and xWR14xx With TSW1400 Data Format................................................................ 11

8 xWR16xx and IWR6843 With TSW1400 Data Format ................................................................ 13

9 Interpreting Binary File in MATLAB ...................................................................................... 15

10 Summary .................................................................................................................... 21

11 References .................................................................................................................. 21

List of Figures

1 Opening Memory Browser in CCS ........................................................................................ 3

2 Memory Browser Save Memory Button................................................................................... 4

3 Save Memory and File Type ............................................................................................... 4

4 Interleaved Complex Data Format Using Capture Demo .............................................................. 5

5 Interleaved Real Data Format Using Capture Demo ................................................................... 5

6 Non-Interleaved Complex Data Format Using Capture Demo......................................................... 6

7 Non-Interleaved Real Data Format Using Capture Demo.............................................................. 6

8 xWR14xx Real Data Format Using DCA1000 ........................................................................... 7

9 xWR14xx Complex Data Format Using DCA1000 ...................................................................... 8

10 xWR16xx/IWR6843 Real Data Format Using DCA1000 ............................................................... 9

11 xWR16xx/IWR6843 Complex Data Format Using DCA1000......................................................... 10

12 xWR14xx Real Data Format Using TSW1400 ......................................................................... 11

13 xWR14xx Complex Data Format Using TSW1400 .................................................................... 12

14 xWR16xx/IWR6843 Real Data Format for One Receiver Using TSW1400 ........................................ 13

15 xWR16xx/IWR6843 Real Data Format for Multiple Receivers Using TSW1400................................... 13

16 xWR16xx/IWR6843 Complex Data Format Using TSW1400 ........................................................ 14

17 MATLAB Script Output -- xWR14xx With DCA1000................................................................... 16

18 MATLAB Script Output -- xWR16xx With DCA1000................................................................... 17

19 MATLAB Script Output -- xWR14xx With TSW1400 .................................................................. 19

20 MATLAB Script Output -- xWR16xx With TSW1400 .................................................................. 20

Introduction

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SWRA581B–December 2017–Revised October 2018

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Mmwave Radar Device ADC Raw Data Capture

Trademarks

Code Composer Studio is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

1 Introduction

The raw data of the mmwave radar (xWRxxxx) can be captured using the Capture Demo provided in the

mmWave SDK, or using Mmwave Studio provided in Mmwave Studio GUI tools. The primary topics

covered include how to save raw data from the Capture Demo using Code Composer Studio™ (CCS), the

raw data format of data captured using the Capture Demo, the raw data format of data captured using

Mmwave Studio, and how to interpret the data in MATLAB. This document assumes that the user knows

how to run the Capture Demo and Mmwave Studio. For instructions on how to run the Capture Demo,

consult the mmWave SDK Demo Setup Guide found in the TI Resource Explorer mmWave Training

Demos folder. For information on how to capture data using Mmwave Studio, consult the Mmwave Studio

User's Guide in Mmwave Studio GUI tools.

Note that Mmwave Studio, previously known as Radar Studio, supports two different platforms. One is

DCA1000EVM Data Capture Card User's Guide, which has interface with xWRxxxx EVM that enables

users to stream the ADC data over Ethernet. Another platform is TSW140x High Speed Data

Capture/Pattern Generator Card which requires Mmwave devPack EVM and High Speed Data Converter

Pro GUI User's Guide. TSW1400 EVM transmits the captured data through Serial Peripheral Interface

(SPI) to PC (through onboard USB to SPI converter). The Radar Studio (older version of Mmwave Studio)

only supports TSW1400 EVM with HSDC Pro. For more information, see Device Firmware Package for

the Radar Studio User's Guide and mmWave Sensor Raw Data Capture Using the TSW1400 Board for

the training video.

For differences in the user interface of Mmwave Studio for DCA1000 EVM and TSW1400, see the

Mmwave Studio User Guide . DCA1000 design is based on Lattice FPGA and LVDS data is captured

through Ethernet streaming. TSW1400 EVM, based on Altera FPGA, capture the LVDS data in different

format. Data format also depends on the type of mmwave devices. Therefore, the different format need to

be discussed separately.

The application report is organized as follows - Section 2 lists the prerequisites. Section 3 describes how

to run and save ADC data using capture demo and CCS. Section 4 discusses the data format saved by

capture demo and CCS. Section 5,Section 6,Section 7 and Section 8 have detailed description of the data

format saved by Mmwave Studio for different xWRxxxx devices using DCA1000 and TSW1400,

respectively. Section 9 provides Matlab script example to process the data captured by Mmwave Studio.

Viewing and Saving Raw Data Using Capture Demo and CCS

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SWRA581B–December 2017–Revised October 2018

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Mmwave Radar Device ADC Raw Data Capture

To save the raw ADC data click the Save Memory button at the top right corner of the Memory Browser

window as shown in Figure 2.

Figure 2. Memory Browser Save Memory Button

In the Save Memory menu, specify the file path and file name and select TI Data as the file type as shown

in Figure 3.

Figure 3. Save Memory and File Type

Click Next and specify the format, start address and length. For the format, select 16-Bit Hex – TI Style.

The length of the data is based on the users chirp configuration. To calculate the length in words, the

following formulas can be used. First, find the total size of ADC data generated in bytes.

Total Size in Bytes = Num ADC Samples × Num RX Channels × Num Frames × Num Chirps × Num Bytes Per

Sample (1)

The number of bytes per sample is based the output format specified by the adcCfg parameter in the

sensor configuration. For a complex output format, there are 4 bytes per sample: 2 bytes for the real part

and 2 bytes for the imaginary part. For a real output format, there are 2 bytes per sample. Once the total

size of the data in bytes is determined the number of words can be found by dividing the total size by 16;

this assumes that the user is saving in a 16-bit Hex – TI Style format.

Length in Words = Total Size / 2 bytes per word (2)

Once the data is saved, it can be viewed in MATLAB using the capture_demo.m file located at

C:\mmwave_sdk_<version_number>\packages\ti\demo\xwr14xx\capture\gui for the xWR1xx, and located

at C:\ti\mmwave_sdk_01_00_00_05\packages\ti\demo\xwr16xx\capture\gui for the xWR16xx. This file

plots the raw ADC data and the 1D FFT of the ADC data. This code can be modified to complete

additional post processing on the data. To do further post processing, you must understand how the

output data is formatted, as shown in Section 4.

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