Contents
How is the range of a FMCW radar determined?
The use of an FMCW radar for range and velocity measurement is outlined in the paper. An FMCW radar emits a continuous wave, frequency modulated by a sawtooth function. Object range information is deduced from the frequency of homodyne-demodulated return signal.
What’s the frequency of a Tx-Rx radar antenna?
In my case the radar works in the [6.014-7.76] GHz band (I have 187 frequency points starting from 6.014 GHz and ended with 7.76GHz) and the data that I collect are organized in a complex-double numbers (I&Q) matrix [Number of frame x 187] per each couple tx-rx antennas.
Can you tell me how a radar works?
Unfortunately the radar company doesn’t want to provide me with so much information about how the radar works and I am not much of an expert. They said that the collected data are the channel response in the frequency domain.
Why are continuous wave radars cannot determine target range?
Simple continuous wave radar devices without frequency modulation have the disadvantage that it cannot determine target range because it lacks the timing mark necessary to allow the system to time accurately the transmit and receive cycle and to convert this into range.
When does the radar operate at the second frequency?
During the pulse top of the rectangular pulse, the radar operates at the first frequency, and during the interpulse period the radar operates at the second frequency. During these times in the millisecond range, the radar will work as for CW radar method.
How does radar measure the direction of movement?
The radar then measures depending on the movement direction and the direction of the linear modulation only the sum or the difference between the difference frequency as the carrier of the distance information, and of the Doppler frequency as a carrier of the velocity information.