Therefore, the value of Doppler frequency, $f_d$ is $926HZ$ for the given specifications.
So, the total angle of excursion made by the electromagnetic wave during the two-way communication path between the Radar and target will be equal to $4\pi R/\lambda$ radians.įollowing is the mathematical formula for angular frequency, $\omega$ −įollowing equation shows the mathematical relationship between the angular frequency $\omega$ and phase angle $\phi$ − We know that one wave length $\lambda$ corresponds to an angular excursion of $2\pi$ radians. Weather radars send out pulses of microwave energy and listen between the transmitted pulses for part of that the energy to be. If $\lambda$ is one wave length, then the number of wave lengths N that are present in a two-way communication path between the Radar and target will be equal to $2R/\lambda$. Therefore, the total distance between the Radar and target in a two-way communication path will be 2R, since Radar transmits a signal to the target and accordingly the target sends an echo signal to the Radar. The distance between Radar and target is nothing but the Range of the target or simply range, R.
Now, let us derive the formula for Doppler frequency. The frequency of the received signal will decrease, when the target moves away from the Radar. The frequency of the received signal will increase, when the target moves towards the direction of the Radar. WSTM WSTQ WTVH provide up to the minute news, sports, weather and community notices to Syracuse and surrounding communities, including North Syracuse.
This effect is known as the Doppler effect.Īccording to the Doppler effect, we will get the following two possible cases − If the target is not stationary, then there will be a change in the frequency of the signal that is transmitted from the Radar and that is received by the Radar. is the official website for KSDK-TV, Channel 5, your trusted source. In this chapter, we will learn about the Doppler Effect in Radar Systems.