Abstract: There is provided herein a visible light-based speed estimation method ViLDAR. By using the received light intensity of a vehicle's LED headlight, the vehicle speed can be accurately estimated for a wide range of incidence angle. Linear LS method is used in one embodiment of a speed estimation algorithm. The impact of system parameters on speed estimation error and the performance of algorithm for different speed and estimation duration are provided. Some embodiments operate best at a certain distances where the received light intensity (power) reading can provide estimation results with high accuracy, which distances are termed a reliable region of operation. In addition to speed estimation, potential applications of ViLDAR idea are ranging detection and collision avoidance for autonomous vehicles.

Abstract: According to an embodiment there is taught herein a system and method of noncontact human vital signs monitoring using light sensing (also referred to generally herein as visible light sensing (VLS)) that can, in some embodiments, measure in real-time breathing (respiration) and heartbeat rates without body contact. One variation comprises a photo-detector (PD) sensor, which measures signal power level of the reflected light signal from the patient's body and an embedded processing system for the signal processing and filtering on the received light signal. The technology taught herein has the potential to address numerous conditions where the use of contact-based devices may be problematic.

Abstract: There is provided herein a visible light-based speed estimation method ViLDAR. By using the received light intensity of a vehicle's LED headlight, the vehicle speed can be accurately estimated for a wide range of incidence angle. Linear LS method is used in one embodiment of a speed estimation algorithm. The impact of system parameters on speed estimation error and the performance of algorithm for different speed and estimation duration are provided. Some embodiments operate best at a certain distances where the received light intensity (power) reading can provide estimation results with high accuracy, which distances are termed a reliable region of operation. In addition to speed estimation, potential applications of ViLDAR idea are ranging detection and collision avoidance for autonomous vehicles.