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https://github.com/ly0n/extended-kalman-filter

CarND Extended Kalman Filter Project Term 2 Project 1
https://github.com/ly0n/extended-kalman-filter

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CarND Extended Kalman Filter Project Term 2 Project 1

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# Extended Kalman Filter Project Starter Code

Self-Driving Car Engineer Nanodegree Program



In this project you will utilize a kalman filter to estimate the state of a moving object of interest with noisy lidar and radar measurements. Passing the project requires obtaining RMSE values that are lower than the tolerance outlined in the project rubric. 



This project involves the Term 2 Simulator which can be downloaded [here](https://github.com/udacity/self-driving-car-sim/releases)



This repository includes two files that can be used to set up and install [uWebSocketIO](https://github.com/uWebSockets/uWebSockets) for either Linux or Mac systems. For windows you can use either Docker, VMware, or even [Windows 10 Bash on Ubuntu](https://www.howtogeek.com/249966/how-to-install-and-use-the-linux-bash-shell-on-windows-10/) to install uWebSocketIO. Please see [this concept in the classroom](https://classroom.udacity.com/nanodegrees/nd013/parts/40f38239-66b6-46ec-ae68-03afd8a601c8/modules/0949fca6-b379-42af-a919-ee50aa304e6a/lessons/f758c44c-5e40-4e01-93b5-1a82aa4e044f/concepts/16cf4a78-4fc7-49e1-8621-3450ca938b77) for the required version and installation scripts.



Once the install for uWebSocketIO is complete, the main program can be built and run by doing the following from the project top directory.



1. mkdir build

2. cd build

3. cmake ..

4. make

5. ./ExtendedKF



Tips for setting up your environment can be found [here](https://classroom.udacity.com/nanodegrees/nd013/parts/40f38239-66b6-46ec-ae68-03afd8a601c8/modules/0949fca6-b379-42af-a919-ee50aa304e6a/lessons/f758c44c-5e40-4e01-93b5-1a82aa4e044f/concepts/23d376c7-0195-4276-bdf0-e02f1f3c665d)



Note that the programs that need to be written to accomplish the project are src/FusionEKF.cpp, src/FusionEKF.h, kalman_filter.cpp, kalman_filter.h, tools.cpp, and tools.h



The program main.cpp has already been filled out, but feel free to modify it.



Here is the main protcol that main.cpp uses for uWebSocketIO in communicating with the simulator.



INPUT: values provided by the simulator to the c++ program



["sensor_measurement"] => the measurement that the simulator observed (either lidar or radar)



OUTPUT: values provided by the c++ program to the simulator



["estimate_x"] <= kalman filter estimated position x

["estimate_y"] <= kalman filter estimated position y

["rmse_x"]

["rmse_y"]

["rmse_vx"]

["rmse_vy"]



---



## Other Important Dependencies



* cmake >= 3.5

  * All OSes: [click here for installation instructions](https://cmake.org/install/)

* make >= 4.1 (Linux, Mac), 3.81 (Windows)

  * Linux: make is installed by default on most Linux distros

  * Mac: [install Xcode command line tools to get make](https://developer.apple.com/xcode/features/)

  * Windows: [Click here for installation instructions](http://gnuwin32.sourceforge.net/packages/make.htm)

* gcc/g++ >= 5.4

  * Linux: gcc / g++ is installed by default on most Linux distros

  * Mac: same deal as make - [install Xcode command line tools](https://developer.apple.com/xcode/features/)

  * Windows: recommend using [MinGW](http://www.mingw.org/)



## Basic Build Instructions



1. Clone this repo.

2. Make a build directory: `mkdir build && cd build`

3. Compile: `cmake .. && make` 

   * On windows, you may need to run: `cmake .. -G "Unix Makefiles" && make`

4. Run it: `./ExtendedKF `



## Editor Settings



We've purposefully kept editor configuration files out of this repo in order to

keep it as simple and environment agnostic as possible. However, we recommend

using the following settings:



* indent using spaces

* set tab width to 2 spaces (keeps the matrices in source code aligned)



## Code Style



Please (do your best to) stick to [Google's C++ style guide](https://google.github.io/styleguide/cppguide.html).



## Generating Additional Data



This is optional!



If you'd like to generate your own radar and lidar data, see the

[utilities repo](https://github.com/udacity/CarND-Mercedes-SF-Utilities) for

Matlab scripts that can generate additional data.



## Project Instructions and Rubric



Note: regardless of the changes you make, your project must be buildable using

cmake and make!



More information is only accessible by people who are already enrolled in Term 2

of CarND. If you are enrolled, see [the project resources page](https://classroom.udacity.com/nanodegrees/nd013/parts/40f38239-66b6-46ec-ae68-03afd8a601c8/modules/0949fca6-b379-42af-a919-ee50aa304e6a/lessons/f758c44c-5e40-4e01-93b5-1a82aa4e044f/concepts/382ebfd6-1d55-4487-84a5-b6a5a4ba1e47)

for instructions and the project rubric.



## Hints and Tips!



* You don't have to follow this directory structure, but if you do, your work

  will span all of the .cpp files here. Keep an eye out for TODOs.

* Students have reported rapid expansion of log files when using the term 2 simulator.  This appears to be associated with not being connected to uWebSockets.  If this does occur,  please make sure you are conneted to uWebSockets. The following workaround may also be effective at preventing large log files.



    + create an empty log file

    + remove write permissions so that the simulator can't write to log

 * Please note that the ```Eigen``` library does not initialize ```VectorXd``` or ```MatrixXd``` objects with zeros upon creation.



## Call for IDE Profiles Pull Requests



Help your fellow students!



We decided to create Makefiles with cmake to keep this project as platform

agnostic as possible. Similarly, we omitted IDE profiles in order to ensure

that students don't feel pressured to use one IDE or another.



However! We'd love to help people get up and running with their IDEs of choice.

If you've created a profile for an IDE that you think other students would

appreciate, we'd love to have you add the requisite profile files and

instructions to ide_profiles/. For example if you wanted to add a VS Code

profile, you'd add:



* /ide_profiles/vscode/.vscode

* /ide_profiles/vscode/README.md



The README should explain what the profile does, how to take advantage of it,

and how to install it.



Regardless of the IDE used, every submitted project must

still be compilable with cmake and make.



## How to write a README

A well written README file can enhance your project and portfolio.  Develop your abilities to create professional README files by completing [this free course](https://www.udacity.com/course/writing-readmes--ud777).