Instead of sending the signal to a computer's sound card for analysis, I sent the signal to an analog input of a Feather board.
Vind de fabrikant Fmcw van hoge kwaliteit Fmcw, leverancier en producten voor de laagste prijzen bij Alibaba.com Reflections from small objects directly in front of the receiver can be overwhelmed by reflections entering antenna side-lobes from large object located to the side, above, or behind the radar, such as trees with wind blowing through the leaves, tall grass, sea surface, freight trains, busses, trucks, and aircraft. This technique is used with the least expensive kinds of radar, such as those used for traffic monitoring and sports. Individual objects are detected using the Doppler effect, which causes the received signal to have a different frequency than the transmission, allowing it to be detected by filtering out the transmitted frequency.
There are two different antenna configurations used with continuous-wave radar: The radar receive antenna is located nearby the radar transmit antenna in Interrupted continuous-wave can be used to eliminate bleed-through between the transmit and receive antenna. The concept of radar cross-section, waveform design, antennas, transmitter and receiver characteristics, and the detection of radar signals in the presence of noise are presented. The filter approach relies on using a very narrow band reject filter that will eliminate low velocity signals from nearby reflectors. FMCW-Radarsensor und Verfahren zur Bestimmung von Information über Abstände und Relativgeschwindigkeiten georteter Objekte mit einem FMCW-Radar, bei dem die Frequenz (f) eines Sendesignals in der Form von Folgen von Frequenzrampen (26) moduliert wird, wobei innerhalb einer jeweiligen Folge die Mittelpunkte der Frequenzrampen (26) auf einer übergeordneten Rampe (28) … Doubling transmit power increases distance performance by about 20%. Range demodulation is limited to 1/4 wavelength of the transmit modulation.
Students will work in teams of 3 to build their radar, and conduct a sequence of experiments as the radar kit is implemented. The amount of spectrum spreading caused by modulation riding on the receive signal is proportional to the distance to the reflecting object. FM-CW radars can be built with one antenna using either a circulator, or circular polarization. D. Weyer et al. a member for this project? Sawtooth modulation is the most used in FM-CW radars where range is desired for objects that lack rotating parts. This set of 10 lectures, about 11+ hours in duration, was excerpted from a three-day course developed at MIT Lincoln Laboratory to provide an understanding of radar systems concepts and technologies to military officers and DoD civilians involved in radar systems development, acquisition, and related fields. Because of simplicity, CW radar are inexpensive to manufacture, relatively free from failure, cheap to maintain, and fully automated. Triangle wave modulation can be used to achieve the same goal.