This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.

Sequential Radar Tracking Simulation

This example performs a Monte Carlo simulation of a radar station that tracks the path of an aircraft. The radar station uses the radar equation to estimate the aircraft position. We introduce measurement errors as a random variable, and the radar station performs Kalman filtering to try to correct for them. To estimate the effectiveness of the Kalman filter, we perform repeated simulations, each time having the aircraft travel along a randomly chosen path.

For details about the computations, open the pctdemo_model_radar model.


Related examples:

Load the Example Settings and the Data

We start by getting the example difficulty level. If you want to use a different example difficulty level, use paralleldemoconfig and then run this example again. See Customizing the Settings for the Examples in the Parallel Computing Toolbox™ for full details.

difficulty = pctdemo_helper_getDefaults();

We define the number of simulations and the length of each simulation in pctdemo_setup_radar. The example difficulty level controls the number of simulations we perform. The function pctdemo_setup_radar also shows examples of the different paths that the aircraft can take, as well as the error in the estimated aircraft location. You can view the code for pctdemo_setup_radar for full details.

[fig, numSims, finishTime] = pctdemo_setup_radar(difficulty);
startClock = clock;

Run the Simulation

We let the pctdemo_task_radar function perform numSims simulations, and it will return a matrix of the size (finishTime + 1)-by-numSims. You can view the code for pctdemo_task_radar for full details.

residual = pctdemo_task_radar(numSims, finishTime);

Measure the Elapsed Time

The time used for the sequential computations should be compared against the time it takes to perform the same set of calculations using the Parallel Computing Toolbox in the Distributed Radar Tracking Simulation example. The elapsed time varies with the underlying hardware.

elapsedTime = etime(clock, startClock);
fprintf('Elapsed time is %2.1f seconds\n', elapsedTime);
Elapsed time is 68.7 seconds

Plot the Results

We use the simulation results to calculate the standard deviation of the range estimation error as a function of time. You can view the code for pctdemo_plot_radar for full details.

pctdemo_plot_radar(fig, residual);