Radar working principle

Create a ratio that places the length of the cycle activity in the numerator and the length of the overall cycle in the denominator. Divide the numbers. Multiply the result by 100 percent . This yields the pulse width of the duty cycle.

Bandwidth B, BW or Δf is the difference between the upper and lower cut-off frequencies of radar receiver , and is typically measured in hertz. In case of a baseband channel or video signal, the bandwidth is equal to its upper cut-off frequency.

The pulse length is usually called the PULSE WIDTH in radar systems. The pulse interval, or the time from the beginning of one pulse to the beginning of the next, is determined by the number of pulses which are transmitted in a given period of time. In radar, we measure all time in seconds (or fractions of seconds).

Pulse length is defined as the duration of a single transmitted radar pulse and is often quoted in microseconds (μs) , although pulses rather shorter than 1 μs are sometimes given in nanoseconds (ns), where 1 ns=10−9 s; and so there are 1000 ns to 1 μs.

Therefore, pulse width constrains the maximum detection range of a target . Pulse width also constrains the range discrimination, that is the capacity of the radar to distinguish between two targets that are close together.