Abstract
In the coded pulse scanning light detection and ranging (LIDAR) system, the number of laser pulses used at a given measurement point changes depending on the modulation and the method of spreading used in optical code-division multiple access (OCDMA). The number of laser pulses determines the pulse width, output power, and duration of the pulse transmission of a measurement point. These parameters determine the maximum measurement distance of the LIDAR and the number of measurement points that can be employed per second. In this paper, we suggest possible combinations of modulation and spreading technology that can be used for OCDMA, evaluate their performance and characteristics, and study optimal combinations according to varying operating environments.
Highlights
Pulse scanning light detection and ranging (LIDAR) measures the distance to a given object using a time-of-flight (ToF) technique that measures the time required for a pulse to transmit to and reflect off the object [1,2,3,4,5,6]
We investigate the characteristics of various modulations and spreading code methods that can be used for the prototype LIDAR with pulse coding and compare various characteristics of LIDAR according to the combinations
We evaluated the performance of the following elements based on combinations of various modulation and spreading code techniques, as well as the operating characteristics of the prototype LIDAR
Summary
Pulse scanning light detection and ranging (LIDAR) measures the distance to a given object using a time-of-flight (ToF) technique that measures the time required for a pulse to transmit to and reflect off the object [1,2,3,4,5,6]. In order to solve this problem only, increasing the pulse repetition period decreases the range ambiguity by increasing the maximum distance, but increases the idle listening time between the laser pulse transmission and reception and reduces the number of measurement points, frame refresh rate, and angular resolution per second [9,16,17]. The prototype LIDAR system uses a unipolar optical digital modulation scheme and spreading code to identify pixel locations and determine the distance to an object [16,17]. The transmitter adjusts the angle of the MEMS mirror based on the pixel information, emits and deflects the optically modulated and spread laser pulses in the desired bearing direction, and simultaneously records its row identification number (RID), CID, and emission time.
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