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🔥 Content Introduction
Based on MATLAB GUIDE, the multi-baseline interferometer direction finding virtual simulation experiment platform is developed, with the core function being the full-process simulation of the interferometer direction finding through GUI interaction. It supports one-dimensional/two-dimensional interferometer configurations, single/dual target source simulation, signal generation – transmission – reception – processing – direction finding full link verification, and ultimately outputs direction finding results and error analysis. The following analysis will be conducted from three aspects: core functions, existing issues, and optimization solutions:
1. Core Function Analysis (Module by Module)
1. GUI Interaction Control Module
- Interferometer Type Selection: Select one-dimensional/two-dimensional interferometer through
<span>popupmenu1</span>, automatically control the enabling/disabling of the corresponding parameter editing box (e.g., enabling Z-axis coordinate editing for two-dimensional interferometers). - Target Source Configuration: Enable by checking
<span>checkbox2</span>(Target Source 1) and<span>checkbox1</span>(Target Source 2), supporting the setting of signal parameters (bandwidth, pulse width, carrier frequency, etc.) and spatial coordinates (X/Y/Z axes). - Antenna Array Configuration: Set the element ratio through
<span>edit1/edit2/edit38</span>, set the antenna reference through<span>edit37</span>, and click<span>pushbutton3</span>to call the<span>antGen</span>function to generate the array and display it in<span>axes1</span>. - Simulation Trigger: Click
<span>pushbutton5</span>to start the full-process simulation (signal generation → transmission → reception → processing → direction finding → result display).
2. Signal Generation and Reception Module
- Signal Generation: Call the
<span>in_transmitter</span>function to generate pulse signals based on target source parameters (power, bandwidth, pulse width, etc.), supporting single/dual target source signal superposition. - Channel and Reception: Call the
<span>receiver</span>function to simulate the transmission of signals from the target source to the antenna array (considering spatial distance), superimposing receiver noise (<span>receiverNoise</span>function), generating multi-element received signals. - Parameter Verification: Check the reasonableness of the pulse repetition period (PRT) and pulse width (PRT must be greater than pulse width), otherwise pop up an error prompt.
3. Signal Processing and Direction Finding Module
- Signal Preprocessing: Extract phase information from the received signal using the
<span>signalProcessing</span>function (including threshold filtering to eliminate noise interference). - Direction Finding Calculation: Call the
<span>angleSolveAmb</span>function to calculate the azimuth/elevation angle of the target based on the phase difference data of the multi-baseline interferometer, combined with the antenna array coordinates (one-dimensional only azimuth angle, two-dimensional includes elevation angle). - Error Statistics: Compare the direction finding results with the true angles of the target, count the number of errors, and pop up a message box prompt.
4. Result Visualization Module
- Antenna Array Diagram (
<span>axes1</span>): 2D display of antenna element distribution. - Signal Time Domain Graph (
<span>axes2</span>/<span>axes3</span>/<span>axes5</span>): Displays the time domain waveforms of target source 1, target source 2, and received echoes respectively. - Signal Frequency Domain Graph (
<span>axes6</span>): Displays the frequency domain amplitude spectrum of the echo signal. - Target – Antenna Relative Position Diagram (
<span>axes4</span>): 3D display of the spatial relationship between the antenna and target source, supporting rotation for viewing.
⛳️ Running Results
📣 Sample Code
% Noise Superposition
Te = 290; % Temperature
K0=1.3806505e-23;% Boltzmann constant
noisePower = K0*Te*reBand; % Noise Power
[row, col] = size(s1);
sout = sqrt(noisePower)*randn(row, col); % Noise Signal
end
🔗 References
🎈 Some theoretical references are from online literature; please contact the author for removal if there is any infringement.
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