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In radar communication the pulse compression is done in Transmitter.?
Wiki User
∙ 11y ago
No, it is done at the receiver.
Wiki User
∙ 11y ago
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In a pulse-modulation radar system the transmitter does not interfere with the receiver because the transmitter?
Is turned off after each pulse.
In which radar system is the transmitter turned on for short periods of time and off for long periods of time?
Pulse-modulation
How to increase radar range?
The maximum distance at which a radar set is ordinarily effective in detecting objects can be increase by lowering the pulse frequency, raising the peak power of the transmitter, narrow the beam with and increasing the pulse duration
Draw the block diagram of pulsed radar of a transmitter and reciver and explain the function of each block also draw the waveform at each block?
pulse radar block diagram explanation
What is a radar PRF?
Radar Pulse Repetition Frequency - The number of pulses the radar system sends out to the target. A pulse can contain multiple frequencies.
What has the author Gerald Joseph Sieren written?
Gerald Joseph Sieren has written: 'A study of radar pulse compression using complementary series to modulate the transmitted waveform'
What is difference between pulse radar and CW radar?
CW or continuous-wave radar cannot determine range due to the lack of a listening period where the radar signal is silent. Pulse radar has a silent listening period (hence the name pulse radar). Therefore it can determine the range of the object causing the return by counting the elapsed time between transmission and receipt of the echo. The above is not quite correct, Continuous Wave Radar and Pulsed Radar differ by there relationship between the Pulse Width (tau) and the scene size (Swath). CW Radar's determine range by Frequency Modulation (FM) ranging this means that they ramp the RF frequency within the pulse during the transmission and are known as FMCW Radar. Pulsed Radar on the other hand use the pulse timing but can also use the FM Ranging trick to enhanced there signal to noise and reduce there probability of interference or detection/interception. CW radar can deduce range by delaying the transmit signal and mixing it with the receive such that it becomes a homodyne receiver and in such cases it is usual to ramp the RF and perhaps use two aerials rather then just one with a duplexer switch like in a Pulse radar system. Edit- hmm i feel the above answer is bit too complex... i don't think typical person would go as far as concerning FM or Pulse Delay Ranging here's my Answer DIFFERENCES BETWEEN PULSE AND CW RADAR Basis -Transmission Pulse RADAR puts delay between transmitting and receiving periods so the time between transmitted pulse and received pulse is different While CW RADAR, Transmit continuously -Antennas Pulse RADAR may use same antenna for Receiving and Transmitting , when transmitting the receiver is "blanked" and while Receiving the receiver is Activated and transmitter is blanked .. this is done by a device called "Duplexer" CW RADAR typically used 2 Antennas, one for transmit another one to Receive since there are no delay to receive as what usually seen in pulse RADAR -Ranging technique Pulse RADAR may use "Pulse Delay Ranging" to provide Range measurements , Frequency Modulation Ranging may also possible , especially for pulse RADAR that transmit many pulses and have very shot time to "listen" example is FMICW (Frequency Modulated Interrupted Continuous Wave RADAR) While CW RADAR provides Range by means of Doppler based Ranging (FM Ranging)
What are the parts of a Doppler Radar?
Same as the "regular" radar, except that the receiver is a bit different. In regular radar, the receiver looks for the returning signal on the frequency the transmitted pulse was sent out. Yes, it sees" Doppler shifted signals, but with decreasing sensitivity. And it does little with them but combine them with the signal on the frequency of the transmitted pulse. With Doppler radar, the receiver looks for a "band" or group of frequencies around the frequency at which the transmitted pulse was sent out. These "nearby" frequencies represent returns from materials or substances that are moving relative to the transmitter (toward or away from it). And the receiver works with a microprocessor based "analyzer" to paint a picture based on those returning signals that are near the frequency of the transmitted signal and not right on it. Basically, radar has a transmitter, the waveguide to the antenna, the antenna itself, and the receiver. The receiver is plumbed into the same waveguide the transmitter is connected to, but there is a junction (like a "T") where the transmitter and receiver are connected that is capable of directing the transmitted signal out along the waveguide and keeping it from going into the receiver, and then allowing the returned signal to get to the receiver without being "lost" by going back into the transmitter. There is a control system and a display system associated with the equipment as well. Just as one might expect.
Does Police radar work at night?
Yes!!! Radar uses its own emitter. To the receiver it is always night until the transmitter is tuned on. Turning on the transmitter is like turning on a flashlight.
What is a radar transmitter?
A radar transmitter is the portion of the radar system that generates the high power microwave signal that is transmitted. This is the electromagnetic wave that the radar sends out to see if it will be reflected off anything in the field of the antenna. The transmitter generates the pulse (in a pulsed system) when the control system tells it to, and this high energy pulse leaves the transmitter and goes down the waveguide to the antenna. From there it goes out into the medium being "looked through" by the radar. After a time (during which the receiver is listening for returns), the transmitter is again told to create the next pulse. Some radars use a continuously broadcast signal, but most use the pulse. The above statements are correct but not quite complete as it describes pulsed transmitters only. A Transmitter in Essence is either one of two thing a High-Power Amplifier or a High-Power Signal Source. Transmitter can also be either Pulse Modulated (AM) or Continues Wave (CW) and some timed both. Both of these types can be either phase coherent on non-phase coherent. The first practical transmitter was invented by the British and this transmitter made Radar practical, as until then the effect of signal reflection was known but the power transmitted was so low the practical range was so limited it was of little or no use. For this reason the British are regarded as the innovators of Radar (and the inventor by some). The first practical high power transmitter was a magnetron and it was a RF resonate cavity machined from solid cast metal. The advantages of this transmitter is that it is high power and Pulsed, and allows a low transmit duty radio. However the disadvantage is that it is non-phase coherent and fairly narrow from one pulse to the next; however Magnetrons are still used today in almost all Marine Radars. The next radar transmitter to emerge was a Klystron and a Klystron was a high power amplifier rather then high power signal source like the magnetron. Klystrons where phase coherent but where lower power and narrow band. However since the transmitter was now phase coherent, Fourier integration in the signal processing could be used to provide a higher signal to noise ratio in the detection stage to compensate for the reduction in power. The Klystron design differed from the magnetron by not being a circular resonate cavity like the magnetron but was effetely strained out into a liner length and this fixed length made the Klystron Phase Coherent as the path length was known and the amount of tuning received was equal in every pulse, but the coupling to the path length in the design made it narrow band. The Klystron design was modified to provide a standing wave transmitter know as the Travelling Wave Tube (TWT), The Travelling Wave Tube (or Twit as in known), is a wider band version of the Klystron that still maintained the phase coherency. Today the trend is not to have one single large transmitter but to have thousands of small cooperating ones that transmit individually at a low power but when constructively combined provide a high power source as either Pulses of CW. This technology provides a transmitter and a combined receiver in thousands of modules known as TR Modules and there advantage is no single point of failure and element phase control to electronically steer a radar beam.
How are differences in rain intensity viewed of a Doppler radar?
A Doppler radar is a radar that uses a coherent transmitter pulse from a solid state transmitter system, rather than the incoherent pulse from a device such as a magnetron. A coherent signal is a pure sine wave, therefore having a single frequency spectrum, rather than a cluster of frequencies. The radar detects rain/wet snow etc in the normal way, by measuring it's Rayliegh backscatter coefficient. However, it can also detect rapid motion of raindrops by measuring the spectrum of the returned signal. The Doppler principal will cause frequency shifts in the signal that can be extracted by Fourier analysis. This allows the violence of the storm to be measured.
What is the Importance of leading edge and trailing edge in radar pulse?
The leading edge of a radar pulse determines range accuracy. The trailing edge, along with pulse width, determines minimum range.
