Doppler radar

In this first section we discuss the basic ideas in a pulse-Doppler radar system. Our treatment is brief and focuses on the underlying theory rather than on the important issues of implementation. 

An imperfect solution to the problems arising from the contradictory (to Moyal s Identity) requirements of good range and Doppler measurement is adopted by a pulse-Doppler radar. The solution involves the following mechanisms ... 

Van Nostrand, Princeton, NJ (1959), 199 (Doppler Effects, Doppler Radar, Ddppler Shift), 200 (DOVAP) 6) OrdTechTema (1962), 103-R... 

Microwave interference (Doppler radar) techniques may be used to measure the velocity and displacement of the projectile in the barrel and its velocity over its entire trajectory. The basic system consists of a microwave transmitter... 

Doppler radar can predict the speed of the winds and warn people to find shelter. During a dangerous storm, a storm cellar is the best place to be. Being forewarned is the best protection against dangerous storms and tornadoes. . . the outcome can be deadly. 

The so-called Velocity-Damping Doppler Radar used for velocity damping of an inertial system is somewhat different from the homing type of Doppler. Its brief description is given in Ref 2, p 464... 

Tun ten alloys are tised in radar equipment. Here, Doppler radar measures the speed and direction of heal winds. lAAAGE COPYRIGHT 2009, ANTHRO. USED UNDER LICENSE FROM SHUTTERSTOCK.COM. 

Doppler radar The weather radar system that uses the Doppler shift of radio waves to detect air motion... 

The prime contractor is Raytheon Co, and it is powered by the Hercules Mark 58 Mod 0 solid proplnt rocket motor. The airframe is a slim cylindrical body with a pointed ogive nose. Pivoted cruciform delta wings are mid-way along the body, indexed in line with cruciform delta tail fins. Guidance is a Raytheon semi-active Doppler radar homing system, with control by movable wings... 

Doviak, R. J., and Zmic , D. S. (1993). Doppler Radar and Weather Observations, Academic Press, Orlando, FL. 

Doppler Radar. Doppler radar was first used in England in 1953 to pick up the movement of small storms. The basic principle guiding this type of radar is that back-scattered radiation frequency detected... 

Doppler Radar. Doppler radar was first used in England in 1953 to pick up the movement of small storms. The basic principle behind Doppler radar is that the back-scattered radiation frequency detected at a certain location changes over time as the target, such as a storm, moves. The mode of operation requires a transmitter that is used to send short but powerful microwave pulses. When a foreign object... 

Administration Air Route Traffic Control Centers across the nation use images from satellites as well as real-time information from observation units at major airports and from Doppler radar to create reliable forecasts. 

Pulse Doppler Radar processing of a coherent train of pulses usually with uniform spacing. Older versions implemented by analog filters modern versions use fast Fourier transform or discrete Fourier transform processing. 

R.J. Doviak, D.S. Zrnic Doppler Radar and Weather Observation, 2nd edn. (Academic Press, London 1993)... 

The ETCS is composed by several subsystems cormected to the central safety processing unit called European Vital Computer (EVC). The EVC contains an on-board odometry system that performs an estimation of the speed and traveled distance based on the measurements provided by a set of sensors, such as wheel speed encoders, accelerometers or Doppler radars, and the Balise Transmission Module (BTM) that gives the exact position as the train passes the eurobalises placed in the railway track. If the estimations exceed the authorized values, the EVC automatically activates an emergency brake. 

---