What is the velocity of radar waves?
Radar waves travel through the atmosphere at roughly 300,000 km per second (the speed of light). The range to a target is determined by measuring the time that a radar signal takes to travel out to the target and back.
What is the beat frequency how it is used in FMCW radar?
In pure CW radar applications only the Doppler frequency must be processed. This includes frequencies only up to 16.5 kHz by using an FMCW transceiver operating in K-Band (about 24 GHz) and the expected speeds for recording are up to 360 kilometers per hour.
Which block is present to getting the value of range and Doppler velocity in FMCW radar?
The output of Low Frequency Amplifier is applied to both switched frequency counter and average frequency counter. Switched Frequency Counter − It is useful for getting the value of Doppler velocity. Average Frequency Counter − It is useful for getting the value of Range.
How does a FMCW radar work?
FMCW (Frequency Modulated Continuous Wave) radar differs from pulsed radar in that an electromagnetic signal is continuously transmitted. The frequency of this signal changes over time, generally in a sweep across a set bandwidth. Instead, the FMCW radar emits an RF signal that is usually swept linearly in frequency.
What is the typical value of duty cycle in a pulse radar?
The duty cycle expresses the ratio of transmitter “ON” time to the total available time (PRI). If we use our PRF example above (1000 pulses per second), and each pulse emitted was one micro-second (0.000001 seconds), the duty cycle value would be…
What is the main advantage of a CW radar?
The main advantage of CW radar is that energy is not pulsed so these are much simpler to manufacture and operate. They have no minimum or maximum range, although the broadcast power level imposes a practical limit on range.
What are the limitations of CW radar?
There is a limitation by the power in the maximum range of the CW radar. Maximum power depends on the amount of isolation and the transmitter noise, which affects the receiver sensitivity. The target range cannot be obtained by the CW Doppler radar. When there is a number of targets there is a possibility of ambiguity.