|Christian Huelsmeyer, Radar inventor|
Radar is an object-detection system that uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish (or antenna) transmits pulses of radio waves or microwaves that bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna that is usually located at the same site as the transmitter.
Radar was secretly developed by several nations before and during World War II. The term RADAR was coined in 1940 by the United States Navy as an acronym for RAdio Detection And Ranging. The term radar has since entered English and other languages as a common noun, losing all capitalization.
The modern uses of radar are highly diverse, including air and terrestrial traffic control, radar astronomy, air-defense systems, antimissile systems; marine radars to locate landmarks and other ships; aircraft anticollision systems; ocean surveillance systems, outer space surveillance and rendezvous systems; meteorologicalprecipitation monitoring; altimetry and flight control systems; guided missile target locating systems; and ground-penetrating radar for geological observations. High tech radar systems are associated with digital signal processing and are capable of extracting useful information from very high noise levels.(Radar - Wikipedia, the free encyclopedia)
I made a different range of video where I explain my progress in the development of a RADAR based on the Cortex R4 Texas Instruments family, videos explains the following:
1.- response speed of ultrasound (Arduino) is improved using the PWM generator module microcontroller with characteristicsT = 50ms and a positive pulse trigger 10 microsegundos to excite the ultrasound or dutty cicly of 0.01%; in this way the MCU always get a quick response from the ultrasound.
2. The implementation of a stepping motor (1.65 degree), at every step the MCU makes a catch away and stored in its memory.
3. Once the memory is full, the microcontroller interprets the data as being data in cylindrical coordinates.
4. The MCU performs coordinate transformation using:
x = R * cos (angle)
y = R * sin (angle)
R= ultrasound distance
angle = angle of stepping motor
5. microcontroller proceeds the cartesian coordinates and plot the points on the LCD screen.
6. The distance between the lines of the radar is 7 cm.
|Warning: Videos in Spanish|
top view of the circuit in general, the first evidence for a DC motor with a reduction box but the response is used as the angle of rotation were quite poor.
Ultrasound is that it always uses the Arduino family.
Radar screen operation
for the first image, I have the radar without moving, that's the reason why one entire line appears on the screen, it is necessary that the radar is in motion so that the MCU makes a graph of objects.
Once the radar is in operation, it can be clearly seen as the microcontroller average measurements and with better resolution graphics on the screen.
Download the program and schematic: