Engineering Projects

Radar Waveform and Range Determination: A representative radar pulse (waveform) is shown in Fig. 1. The number of these pulses transmitted per second is called the pulse repetition frequency (PRF) or pulse repetition rate (PRR). The time from the beginning of one pulse to the beginning of the next pulse is called the pulse repetition time (PRT). The PRT is the reciprocal of the PRF (PRT = 1/PRF). The duration of the pulse (the time the transmitter is radiating energy) is called the pulse width (PW). The time between pulses…

Radar System Parameters: Once the pulse of electromagnetic energy is emitted by the radar, a sufficient length of time must elapse to allow any echo signals to return and be detected before the next pulse is transmitted. Therefore, the PRT of the radar is determined by the longest range at which targets are expected. If the PRT were too short (PRF too high), signals from some targets might arrive after the transmission of the next pulse. This could result in ambiguities in measuring range. Echoes that arrive after the transmission…

In this article we will discuss about basic radar, and basic radar block diagram. Lets start with basic description of RADAR. What is RADAR? The first practical use of waveguides occurred with the development of radar during World War II. The high powers and high frequencies involved in these systems are much more efficiently carried by waveguides than by transmission lines. The word radar is an acronym formed from the words radio detection and ranging. Radar is a means of employing radio waves to detect and locate objects such as…

In this article we will discuss about different applications of Ferrites. Applications of Ferrites ATTENUATOR: One application of ferrites is as an attenuator. Figure 1 shows a piece of ferrite placed in the center of a waveguide; a steady magnetic field is applied as shown. This arrangement will attenuate frequencies at the resonant frequency of the electrons in the ferrite, whereas other frequencies will be attenuated very slightly. Changing the strength of the dc field produces a change in the frequency that will be attenuated, although this occurs over a…