Hyper Temporal Lidar with Optimized Range-Based Detection Intervals

Abstract

A lidar receiver that includes a photodetector circuit can be controlled so that the detection intervals used by the lidar receiver to detect returns from fired laser pulse shots are closely controlled. Such control over the detection intervals used by the lidar receiver allows for close coordination between a lidar transmitter and the lidar receiver where the lidar receiver is able to adapt to variable shot intervals of the lidar transmitter (including periods of high rate firing as well as periods of low rate firing). The lidar receiver can determine the detection intervals using a cost function that optimizes determination of the detection intervals for a plurality of the laser pulse shots from a shot list.

Description

CROSS-REFERENCE AND PRIORITY CLAIM TO RELATED PATENT APPLICATIONS[0001]This patent application claims priority to U.S. provisional patent application 63 / 186,661, filed May 10, 2021, and entitled “Hyper Temporal Lidar with Controllable Detection Intervals”, the entire disclosure of which is incorporated herein by reference.[0002]This patent application also claims priority to U.S. provisional patent application 63 / 166,475, filed Mar. 26, 2021, and entitled “Hyper Temporal Lidar with Dynamic Laser Control”, the entire disclosure of which is incorporated herein by reference.[0003]This patent application is related to (1) U.S. patent application Ser. No. ______, filed this same day, and entitled “Hyper Temporal Lidar with Controllable Detection Intervals” (said patent application being identified by Thompson Coburn Attorney Docket Number 56976-213637), (2) U.S. patent application Ser. No. ______, filed this same day, and entitled “Hyper Temporal Lidar with Shot-Specific Detection Contro...

AI Technical Summary

Benefits of technology

The patent describes a technical solution for ensuring that laser pulses in a lidar transmitter have sufficient energy to operate properly. This is done by using a laser energy model to predict the energy needed for each planned laser pulse shot. The model takes into account the energy available in the laser source quickly, which allows for reliable operation even during periods of high laser pulse firing. The patent also mentions the use of multiple readout channels in a lidar receiver, which can support overlapping detection intervals for different returns. This helps to improve the accuracy and reliability of the lidar system.

Problems solved by technology

However, as the firing rate for the lidar transmitter increases, this places pressure on the operational capabilities of the laser source employed by the lidar transmitter because the laser source will need re-charging time.

This issue becomes particularly acute in situations where the lidar transmitter has a variable firing rate.

Such laser sources have energy characteristics that are heavily impacted by time and the firing rate of the laser source.

Counterintuitively, the inventors have found that it is often not desirable for a detection interval to be of the same duration as its corresponding shot interval due to factors such as the amount of processing time that is needed to detect returns within return signals.

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