課程目錄:無人駕駛汽車的狀態估計與定位培訓
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          無人駕駛汽車的狀態估計與定位培訓

 

 

 

Module 0: Welcome to Course
2: State Estimation and Localization for Self-Driving CarsThis module introduces
you to the main concepts discussed in the course and presents the layout of the course.
The module describes and motivates the problems of state estimation and localization for self-driving cars.
Module 1: Least SquaresThe method of least squares, developed by
Carl Friedrich Gauss in 1795, is a well known technique for estimating parameter values from data.
This module provides a review of least squares, for the cases of unweighted and weighted observations.
There is a deep connection between least squares and maximum
likelihood estimators (when the observations are considered to be Gaussian random variables) and this connection
is established and explained. Finally, the module develops a technique
to transform the traditional 'batch' least squares estimator to a recursive form, suitable for online,
real-time estimation applications.Module 2: State Estimation - Linear and Nonlinear Kalman FiltersAny engineer working
on autonomous vehicles must understand the Kalman filter,
first described in a paper by Rudolf Kalman in 1960. The filter has been recognized as one of the top 10 algorithms of the 20th century,
is implemented in software that runs on your smartphone and on modern jet aircraft,
and was crucial to enabling the Apollo spacecraft to reach the moon.
This module derives the Kalman filter equations from a least squares perspective, for linear systems.
The module also examines why the Kalman filter is the best linear unbiased estimator (that is, it is optimal in the linear case).
The Kalman filter, as originally published, is a linear algorithm;
however, all systems in practice are nonlinear to some degree. Shortly after the Kalman filter was developed,
it was extended to nonlinear systems, resulting in an algorithm now called the ‘extended’ Kalman filter, or EKF.
The EKF is the ‘bread and butter’ of state estimators, and should be in every engineer’s toolbox.
This module explains how the EKF operates (i.e., through linearization) and discusses its relationship to the original Kalman filter.
The module also provides an overview of the unscented Kalman filter,
a more recently developed and very popular member of the Kalman filter family.
Module 3: GNSS/INS Sensing for Pose EstimationTo navigate reliably,
autonomous vehicles require an estimate of their pose (position and orientation)
in the world (and on the road) at all times. Much like for modern aircraft,
this information can be derived from a combination of GPS measurements and inertial navigation system (INS) data.
This module introduces sensor models for inertial measurement units and GPS (and, more broadly, GNSS) receivers;
performance and noise characteristics are reviewed.
The module describes ways in which the two sensor systems can be used
in combination to provide accurate and robust vehicle pose estimates.
Module 4: LIDAR SensingLIDAR (light detection and ranging) sensing is an enabling technology for self-driving vehicles.
LIDAR sensors can ‘see’ farther than cameras and are able to provide accurate range information.
This module develops a basic LIDAR sensor model and explores how
LIDAR data can be used to produce point clouds (collections of 3D points in a specific reference frame).
Learners will examine ways in which two LIDAR point clouds can be registered,
or aligned, in order to determine how the pose of the vehicle has changed with time (i.e.,
the transformation between two local reference frames).
Module 5: Putting It together - An Autonomous Vehicle State Estimator
This module combines materials from Modules 1-4 together, with the goal of developing a full vehicle state estimator.
Learners will build, using data from the CARLA simulator,
an error-state extended Kalman filter-based estimator that incorporates
GPS, IMU, and LIDAR measurements to determine the vehicle position and orientation on the road at a high update rate.
There will be an opportunity to observe what happens to the quality of the state estimate when one
or more of the sensors either 'drop out' or are disabled.

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