Howtosignalprocessing
- What is range-Doppler coupling?
- What is the range of FMCW radar?
- What is range-Doppler?
- How does FMCW radar estimate the distance?
What is range-Doppler coupling?
Slight Doppler mismatches for the LFM pulse do not change the general shape of the pulse and reduce the amplitude very little, but they do appear to shift the pulse in time. Thus, an uncompensated Doppler shift changes the target's apparent range; this phenomenon is called range-Doppler coupling.
What is the range of FMCW radar?
Frequency Modulation is used in FMCW radar. FMCW radars use mm wave electromagnetic spectrum which has very short wavelengths upto 4 mm [9], [10]. The frequency used is in range of 76–81 GHz. Higher frequencies are used so that even smaller objects can be detected effectively.
What is range-Doppler?
If a transmitter platform is stationary, a range-Doppler map shows a response from stationary targets at zero Doppler. For targets that are moving relative to the transmitter platform, the range-Doppler map shows a response at nonzero Doppler values.
How does FMCW radar estimate the distance?
FMCW radar systems measure the frequency difference (Δf, due to run time) between the transmitted and received echo signal for calculating the distance, and it also measures the Doppler frequency (due to the Doppler effect) for calculating the speed of the object.
