Distance measurement system

Abstract

Abstract Translated from Japanese (57)【要約】 【課題】 前方物体までの距離計測とフロントカバーの 汚れ検知とを正確に行う。 【解決手段】 レーザー光パルスの送光から受光までの 測定時間を、送光されたレーザー光パルスがカバーの汚 れに散乱した散乱光を受光する散乱光領域と、送光され たレーザー光パルスがカバーより遠方にある物体に反射 した反射光を受光する反射光領域とに区分し、物体まで の距離を計測するときは、反射光領域における受光信号 強度の最大値が所定の強度範囲に入るように増幅ゲイン を制御し、物体からの反射光の受光信号強度が物体検知 しきい値を超えた場合に、当該反射光受光までの測定時 間に基づいて障害物までの距離を演算する。また、カバ ーの汚れを診断するときは、増幅ゲインに所定値を設定 し、散乱光領域における受光信号強度の最大値を汚れ検 知しきい値と比較して診断を行う。 (57) [Summary] [Problem] To accurately measure a distance to a front object and detect dirt on a front cover. A scattered light region for receiving scattered light in which the transmitted laser light pulse is scattered on a dirt on a cover and a transmitted laser light pulse are measured by measuring a measurement time from transmission of the laser light pulse to reception of the laser light pulse. When the distance to the object is measured, the maximum value of the received light signal intensity in the reflected light area falls within a predetermined intensity range when the distance to the object is measured. When the received signal strength of the reflected light from the object exceeds the object detection threshold, the distance to the obstacle is calculated based on the measurement time until the reflected light is received. Further, when diagnosing dirt on the cover, a predetermined value is set for the amplification gain, and the diagnosis is performed by comparing the maximum value of the received light signal intensity in the scattered light region with the dirt detection threshold value.

Inventors

• 👤 Miyoshi Otomo
• 👤 美佳 大友
• 👤 Kazuki Mizoguchi
• 👤 和貴 溝口

Bibliographic Details