Principle of Doppler Effect
Stationary Vs Moving Targets
- When a radar signal is transmitted and contemplated off a desk bound target, the frequency of the reflected sign remains unchanged.
- For a moving target, but, the frequency of the pondered sign is altered due to the Doppler effect. If the target is shifting towards the radar, the frequency will increase (blue shift); if transferring away, the frequency decreases (red shift).
Frequency Shift Calculation
- The frequency shift (Δf) is proportional to the radial pace (Vr) of the goal and the radar’s transmitted frequency (f₀).
- The formulation is given by means of: Δf = 2 * Vr * f₀ / c, where c is the speed of light.
Applications of Doppler Radar
- Weather Monitoring: Doppler radar is drastically used in meteorology for weather monitoring and forecasting. By detecting the frequency shift of precipitation particles (rain, snow, hail), meteorologists can decide the motion and depth of storms.
- Air Traffic Control: In aviation, Doppler radar enables display the movement of plane. It aids in air site visitors manipulate through supplying data on the velocity and course of planes, contributing to safe and green air tour.
- Traffic Monitoring : Doppler radar is hired in traffic manage structures for pace dimension and monitoring. It facilitates put in force pace limits, manipulate site visitors float, and decorate road protection.
- Military Surveillance : The military uses Doppler radar for surveillance and tracking of moving goals. It performs a vital position in air defense systems by using detecting and monitoring the rate and trajectory of plane and missiles.
- Medical Imaging : Doppler radar generation is implemented in clinical devices for non-invasive imaging of blood waft. Doppler ultrasound, as an instance, is used to visualize blood move in arteries and veins.
Types of Doppler Radar
- Pulsed Doppler Radar : Measures the Doppler shift via transmitting pulses of radiofrequency waves and studying the frequency modifications inside the meditated pulses.
- Continuous Wave (CW) Doppler Radar : Utilizes a continuous transmission of radiofrequency alerts and analyzes the frequency shift of the continuously meditated signal to determine target speed.
Continuous Wave Radar
Continuous Wave (CW) radar technology has been a cornerstone in the discipline of radar structures, imparting particular blessings and programs in various industries. Unlike pulsed radar systems, CW radar emits a continuous sign, imparting consistent statistics approximately the target. This article delves into the concepts, functionalities, and numerous programs of Continuous Wave Radar.
Table of Content
- Principles
- Doppler Radar
- Function
- Block Diagram
- Calculation of radar range
- Applications
- Working