What does pulse mean on a radar?
As a defense against detectors, many radar units can be operated in the Instant-on mode, also called the Pulse mode. This means the radar is in position, but it is not transmitting a beam. So it cannot be detected.
How fast is a radar pulse?
roughly 300,000 km per second
Some radar pulse widths are even of nanosecond (10−9 second) duration. Radar waves travel through the atmosphere at roughly 300,000 km per second (the speed of light).
Why must a radar pulse be amplified?
RF is the frequency of the carrier wave which is being modulated to form the pulse train. Transmitter. The transmitter creates the radio wave to be sent and modulates it to form the pulse train. The transmitter must also amplify the signal to a high power level to provide adequate range.
What is the difference between pulse radar and pulse Doppler radar?
Radar and Inverse Scattering A pulse Doppler radar uses the Doppler shift to discriminate moving targets from stationary clutter. A low PRF radar has a long unambiguous range but results in blind speeds. On the contrary, a high PRF radar can avoid blind speeds but experiences ambiguity in range.
What is the difference between pulse radar and continuous wave radar?
A pulsed radar system typically provides greater measurement range compared to a CW radar, such as an FMCW radar system, with lower power consumption. But due to those continuous signals, CW radar systems are more easily detected than pulsed radar systems, especially those with shorter duty cycles.
What is the maximum range of a radar?
Therefore, the maximum range of Radar for given specifications is 128KM.
What are MTI radar parameters?
Moving target indication (MTI) is a mode of operation of a radar to discriminate a target against the clutter. Early MTI systems generally used an acoustic delay line to store a single pulse of the received signal for exactly the time between broadcasts (the pulse repetition frequency).
What is the main advantage of a CW radar?
The main advantage of CW radar is that energy is not pulsed so these are much simpler to manufacture and operate. They have no minimum or maximum range, although the broadcast power level imposes a practical limit on range.
What is the range of a pulse Doppler radar?
A moving target indicator (MTI) radar in which the pulse repetition frequency (prf), denoted by fp, is low enough to have no range ambiguities; i.e., its maximum unambiguous range Runam = c /2 fp.
What are the characteristics of a radar pulse train?
3D Doppler Radar Spectrum showing a Barker Code of 13 Basic Fourier analysis shows that any repetitive complex signal consists of a number of harmonically related sine waves. The radar pulse train is a form of square wave, the pure form of which consists of the fundamental plus all of the odd harmonics.
What is the peak power of a radar signal?
RADAR EMISSION FUNDAMENTALS -Emissions are pulsed. Usually about 0.1% duty cycle (typically 1 us pulse width, and 1 ms pulse repetition interval). -Peak transmitter power levels often around 1 MW. -Antenna gain often around 30 dBi. -Peak EIRP levels around 1 GW.
Which is better a medium PRF or high PRF pulse radar?
A medium prf pulse doppler radar has both range and doppler ambiguities. It will not detect high relative-velocity targets as well as can a high-prf pulse doppler radar, but it will detect low relative-velocity targets better because its low prf sees less clutter than does the high prf.