![]() ![]() \(\Delta R = \frac = 30 meters\)Ī staggering improvement in range resolution by a factor of 5. Our pulse width will be equal to \(1\mu s\) resulting in a range resolution of, ![]() The radar pulse repetition frequency would be set to 10kHz resulting in a maximum unambiguous range of 15km. The LFM pulse will have sweep bandwidth of 5MHz. Additionally, we shall be transmitting a pulse with Linear frequency modulation for pulse compression. The transmit power will be set at 5W and receiver preamplifier gain set to 10dB with a noise figure of 5. Let us define a few things related to the radar before we proceed. For example, the transmitter, the antenna system, the target itself and so on. In order to simulate a radar system in Matlab, you need to have everything defined. I tried the phased array toolbox for the first time to build a pulsed radar which can determine approximate azimuth angle of the target with respect to the radar. ![]() With so many tools at your disposal, the phased array toolbox lets us build a complete end to end radar system. The scattering phantom along with the simulated ultrasound images are shown below.The Matlab phased array toolbox is a collection of many interesting algorithms and functions. % convert the data from polar coordinates to Cartesian coordinates forī_mode_fund = scanConversion(scan_lines_fund, steering_angles, image_size, c0, kgrid.dt) ī_mode_harm = scanConversion(scan_lines_harm, steering_angles, image_size, c0, kgrid.dt) This step is performed using scanConversion % set the desired size of the image ![]() This means the scan lines must be converted from polar coordinates to Cartesian coordinates. However, in this example, the scan lines are taken at different steering angles. Scan_lines(angle_index, :) = transducer.scan_line(sensor_data) Īfter simulation, the scan lines are processed before display following the steps described in Simulating B-mode Ultrasound Images. % extract the scan line from the sensor data Sensor_data = kspaceFirstOrder3D(kgrid, medium, transducer, transducer, input_args) Transducer.steering_angle = steering_angles(angle_index) % loop through the range of angles to test The scan lines are then simulated sequentially, with the value for transducer.steering_angle modified for each scan line. This is used to replace both the source and sensor inputs. In this example, a 64 element sector transducer is defined with all the elements active. The simulation is run in a similar same way to Simulating B-mode Ultrasound Images. ![]()
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January 2023
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