A low-cost X-band CW Doppler Radar Module, readily available on Ebay. Low enough to be easily digitized by the audio input port of a laptop computer or other low-cost digitizer. This product is the Doppler shift off of the carrier’s center frequency and is generally in the KHz range. The mixer mixes the oscillator and the scattered carrier resulting in a Doppler shift product. This carrier scatters off the moving target back to the receive antenna where it is amplified and fed to a frequency mixer. CW Doppler radar works by feeding the output of a CW oscillator to an antenna and radiates that carrier towards a moving target. If you are not interested in ranging or imaging but would like to measure velocities or radar signatures then consider CW Doppler radar. Continuous Wave (CW) Doppler Radar How CW Doppler radar works. In this post we’ll review these, their basic architectures, and direct you on the next steps. Very few off-shelf small radar options exist as of today. We need the ability to sense like a long range radar (detecting only moving targets, imaging, Doppler, signatures, etc) but at short ranges and at low costs. This offers the obvious advantage of applying signal processing to acquired data so that only moving targets are detected, tracking can be achieved, imaging, and a multitude of other modes.īut for hobbyist and consumer projects we do not need this much power, range, and can not afford the cost. Toady, rather than using a CRT we can use high-speed digitizers. This led to the development of numerous radar sensors used in the second world war, which generally followed the Plan Position Indicator (PPI) architecture. One enabling technology for Radar was the cathode ray tube (CRT), which facilitated a method of measuring the time delay between transmitted and received waveforms. ![]() This block diagram represents a conventional radar that comes to mind when you think about radar, you might find this design used on a fishing boat or commercial aircraft. Radar is a World War Two acronym meaning Radio Direction and Ranging, in other words a radar consists of a radio transmitter and receiver where the range to an object is measured by clocking the time between the transmitter transmitting a known modulated waveform and the receiver receiving this waveform scattered from a target. Radar is simple, it consists of a radio transmitter and receiver. ![]() ![]() Radar Basics Radar uses a radio transmitter and receiver to measure the time of flight from a transmitted radio wave that scatters off a target back to the receiver. In this post we will discuss how radar works, commercially available small radar devices, and where to learn more to help make it easy to add radar to your next project. But today we can use the good stuff that, until recently, was only available to military: radar. The low-end stuff that we can get our hands on usually suffers from poor range, lack of sensitivity, and no way to characterize what the target is.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |