Analysis of Brutingthorpe Crash Day data

Introduction

Superseding the robust and proven platform of its predecessor, INCA CoOrdinator, Artemis was developed to meet the increasing demands of the UK Police, in line with the ACPO ITS One Box Project. INCA was APD’s flagship in-vehicle “blackbox” solution, designed in 1996-1997, and supplied to Police Forces between 1998 and 2006. Many of you will be familiar with INCA and may well have used INCA data in the course of your duties. Indeed, some of you may still be using INCA to this day, as several Police Forces continue to derive benefit from INCA units built in 1998, the technology having outlasted the vehicles it has been installed in several times over.

 
A 2015 XDR unit pictured alongside the battle-scarred 1998 INCA it replaced.

A 2015 XDR unit pictured alongside the battle-scarred 1998 INCA it replaced.

 

Brief Description of IDR Functionality

The IDR module in XDR continually monitors data from internal sensors at up to 200Hz and detects when acceleration values exceed pre-configured thresholds. When this occurs the XDR initiates the recording of an IDR file.

Features of the IDR functionality include:

  • A separate IDR file recorded for each incident
  • Each file is 45 seconds duration (30secs prior to impact and 15secs post impact)
  • Capacitors provide back-up power if vehicle power is lost
  • Activation notification to driver via Driver Feedback LED
  • Over-air notification of incident to back office
  • Manual activation via (dash button (e.g., recording a near miss)
  • IDR files stored on internal Micro SD
  • Capacity monitored and reported over air - no data loss
  • Regular self-tests identify and report any issues over air

XDR files contain the following data elements:

  • Driver ID
  • Vehicle Identification number (VIN)
  • Device information (serial numbers and software versions
  • Digital input/output status changes
  • Vehicle CANbus data (carying rates depending upon data type)
  • 10Hz GPS data (date, time, position, speed, heading, number of satellites, DOP values)
  • 10Hz OBDII information (vehicle speed, engine RPM, faults)
  • 200Hz 3-Axis accelerometer data (2 accelerometers Low G and High G; longitudinal, lateral and vertical acceleration)
  • 200Hz 3-Axis gyroscope
  • Vehicle roll, pitch and yaw

In addition to the above, the XDR offers Journey Data Recording (JDR) functionality. With JDR enabled the XDR stores a second-by-second record of every journey that the vehicle makes. JDR files are written to the internal Micro SD card in the same manner as IDR files and with 32GB storage available there is sufficient capacity to store 2 to 3 years of historical journey information. Having JDR data available in addition to IDR data gives greater context to incident investigation – it allows the events leading up to and following an incident to be analysed, not just the 45 second period around the incident itself.

Detecting the incident and recording the data is only half the story. APD’s Collision Data Analyser (CDA) application reads the captured data, analyses it and presents it in several different visualisations. CDA facilitates complete end-to-end management of journey and incident data, from sensor test and installation record management to full forensic collision data analysis and reconstruction, thereby offering a comprehensive ARTEMIS IDR package.

CDA provides the following features and functionality:

  • Unit sensor and installation tests
  • Calibration Certificate management
  • Data library management
  • Viewing of journey and incident locations on a variety of mapping platforms
  • Graphical analysis of accelerometer, gyro, GPS, OBD/CANbus and i/o data
  • Measurements and calculations of events over distance and time
  • 1-D, 2-D & 3-D reconstruction
  • Comprehensive data import and export capability
  • Integrated video playback
  • Screen capture and recording to assist with report compilation

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