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  • Software Requirements Specification (SRS)
    Pedestrian Backup Assist System (PBS)

    Introduction

    Purpose

    Each year in the United States, there are dozens of back-over accidents (AP). These are accidents where a driver backs over an unsuspecting or unaware pedestrian, and usually occur at low speeds due to driver blind spots. The victims are mostly the elderly and small children who are not mobile or aware enough to get out of harm’s way. The fact that these accidents happen at slow speeds and quite often off road means that they can often be avoided by providing drivers with adequate information (warnings or displays) and automatic countermeasures. This document describes a system to minimize back-over accidents by intentionally increasing in the driver’s situational awareness and assisting the driver with braking when obstacles are present.

    The overall goal of the project is to avoid back-over accidents and prevent injuries to pedestrians.

    Scope

    The output of this design is referred to as the Pedestrian Backup Assist System, or PBAS. This system will be an additional component included in a modern automobile, and will include hardware for sensing and vehicle control as well as software for interfacing and interpretation of sensor data. All software will be a part of embedded automobile components (Electronic Control Units, as defined in 1.3).

    Most back-over accidents are primarily due to a lack of situational awareness on the part of the driver. Understanding the ways in which a driver might be distracted, have decreased visibility and awareness, or both, is crucial to devising an effective mitigation strategy. In some cases the driver may be totally aware and cautious while backing up, yet is unable to see or hear a pedestrian due to vehicle configuration or environmental factors. In other cases, the driver may have all attention focused on something extraneous such as mobile phone. Different types of warnings are necessary in these varying situations. To avoid these accidents, we propose a warning system which gradually increases in intensity as the threat level increases. Such a system can either assist a driver who is actively engaged but otherwise impaired by vehicle configuration or environment, or alert a driver who is not engaged. In cases where warnings (auditory and visual) fail to elicit any mitigating response from the driver, automated countermeasures will be deployed.