TIDUEY3 November   2020

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
      1. 2.1.1 Hardware Block Diagram
      2. 2.1.2 Software Block Diagram
        1. 2.1.2.1 mmWave SDK Software Block Diagram
        2. 2.1.2.2 Software Block Diagram of Application
    2. 2.2 Highlighted Products
      1. 2.2.1 AWR6843AOP
      2. 2.2.2 mmWave SDK
    3. 2.3 System Design Theory
      1. 2.3.1 Use-Case Geometry and Sensor Considerations
      2. 2.3.2 Low-Level Processing
      3. 2.3.3 High-Level Processing Details
        1. 2.3.3.1 DPM Model
        2. 2.3.3.2 Occupancy Detection State Machine
      4. 2.3.4 Output Through UART
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
      2. 3.1.2 Software
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
      2. 3.2.2 Test Results
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 Altium Project
  10. 5Software Files
  11. 6Related Documentation
    1. 6.1 Trademarks

1 System Description

Today’s vehicles require robust and reliable information about the in-cabin occupancy. Smart airbag deployment systems, air condition controls, detecting children and disabled people left behind in vehicles relies upon this information. The TIDEP-01023 provides a reference for creating a vehicle occupant detection application, using TI’s AWR6843AOP sensor based on 60-GHz mmWave radio-frequency complementary metal-oxide semiconductor (RF-CMOS) technology. TI’s mmWave sensing devices integrate a 60-GHz to 64-GHz mmWave radar front end with ARM® microcontroller (MCU) and TI DSP core for single-chip systems.

This reference design demonstrates the suitability of the AWR6843AOP for overhead mount vehicle occupant detection applications. The design targets the implementation of a wide azimuth and elevation field of view (±60°) and close range (3 m) sensor configuration, which can detect life forms across multiple regions (zones) of interest, and can localize occupant signature within a region. This reference design implements algorithms for generating an azimuth-range and elevation-range heat maps, detection, and decision using an AWR6843AOP device on a TI EVM module. The design provides a list of required hardware, schematics, and foundational software to quickly begin vehicle occupancy detection product development. It describes the example usage case as well as the design principle, implementation details, and engineering tradeoffs made in the development of this application. High-level instructions for replicating the design are provided.

Table 1-1 Key Performance Specifications
PERFORMANCE PARAMETER CONFIGURATION
Device AWR6843AOP
Field of view 120° horizontal, 120° vertical
Maximum range 2.7 m
Range resolution 5.3 cm
Maximum velocity 1.7 m/s
Velocity resolution 1.5 cm/s