公开(公告)号：US09684066B2

公开(公告)日：2017-06-20

申请号：US14518800

申请日：2014-10-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Eduardo Bartolome ,  Fernando Alberto Mujica ,  Sandeep Oswal ,  Abhaya Kumar

IPC: G01C3/08 ,  G01S7/486 ,  G01S17/10

CPC classification number: G01S7/4861 ,  G01S7/4865 ,  G01S17/10

Abstract: Samples of a light radar (“LIDAR”) return signal are stored in an analog circular buffer following the transmission of a LIDAR pulse. Sampling continues for a fixed period of time or number of samples during a post-trigger sampling period after the occurrence of a trigger signal from a trigger circuit. The trigger circuit indicates the receipt of a return pulse associated with a target object based upon one or more return signal characteristics. Following the post-trigger sampling period, the stored analog samples are sequentially read out and converted to digital sample values. The digital sample values may be analyzed in a digital processor to further confirm the validity of the returned LIDAR pulse, to determine a time of arrival of the LIDAR pulse, and to calculate a distance to the target object. Some versions include multiple circular buffers and capture clocks, enabling the capture of samples from multiple return pulses.

公开(公告)号：US20150116695A1

公开(公告)日：2015-04-30

申请号：US14518800

申请日：2014-10-20

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Eduardo Bartolome ,  Fernando Alberto Mujica ,  Sandeep Oswal ,  Abhaya Kumar

IPC: G01S17/10

CPC classification number: G01S7/4861 ,  G01S7/4865 ,  G01S17/10

Abstract: Samples of a light radar (“LIDAR”) return signal are stored in an analog circular buffer following the transmission of a LIDAR pulse. Sampling continues for a fixed period of time or number of samples during a post-trigger sampling period after the occurrence of a trigger signal from a trigger circuit. The trigger circuit indicates the receipt of a return pulse associated with a target object based upon one or more return signal characteristics. Following the post-trigger sampling period, the stored analog samples are sequentially read out and converted to digital sample values. The digital sample values may be analyzed in a digital processor to further confirm the validity of the returned LIDAR pulse, to determine a time of arrival of the LIDAR pulse, and to calculate a distance to the target object. Some versions include multiple circular buffers and capture clocks, enabling the capture of samples from multiple return pulses.

Abstract translation: 在发送LIDAR脉冲之后，光雷达（“LIDAR”）返回信号的样本被存储在模拟循环缓冲器中。 在从触发电路发生触发信号之后的后触发采样周期中，采样持续一段固定的时间或采样数。 触发电路基于一个或多个返回信号特征指示接收与目标对象相关联的返回脉冲。 在触发后采样周期之后，存储的模拟采样被依次读出并转换为数字采样值。 可以在数字处理器中分析数字样本值，以进一步确认返回的LIDAR脉冲的有效性，以确定LIDAR脉冲的到达时间，并计算到目标对象的距离。 一些版本包括多个循环缓冲器和捕获时钟，可以捕获来自多个返回脉冲的采样。