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A coherent detector uses the knowledge of the phase of the carrier wave to demoduleate the signal.
it's simply a product device , which multiply the AM signal by a sinusoidal signal having the same carrier frequency , followed by a low pass filter ( LPF). The product will shift the AM signal to 0 Hz and double carrier frequency , and the LPF will eliminate the later component.
2ANSWER:
Coherent detection
inCoherent detection
requires carrier phase recovery at the receiver and hence, circuits to perform phase estimation.
Sources of carrier-phase mismatch at the receiver:
inPropagationtalking causes carrier-phase offset in the received signal.
inThe oscillators at the receiver which generate the carrier signal, are not usually phased locked to the transmitted carrier.
coherent detection: Huge need for a reference in phase with the received carrier
inLess complexity compared to incoherent detection at the price of higher error rate.
Coherent ( synchronous ) detection: in coherent detection , the local carrier generated at the receiver in phase locked with the carrier at transmitter .
Non coherent ( envelope ) detection : this type of detection does not need receiver carrier to be phase locked with transmitter carrier
What else can I help you with?
What is difference between synchronous detection and envelop detection?
Synchronous detection, also known as coherent detection, involves multiplying the incoming signal with a reference signal that is phase-aligned, allowing for accurate recovery of the signal even in the presence of noise. Envelop detection, on the other hand, is a simpler method primarily used for amplitude modulation (AM) signals, where the envelope of the modulated signal is extracted to retrieve the original message. While synchronous detection is more complex and effective in various conditions, envelope detection is easier to implement and is often used in applications where precise phase information is not critical.
Why coherent oscillator in MTI?
A coherent oscillator in a Moving Target Indicator (MTI) radar system is crucial because it provides a stable frequency reference that enables precise detection of moving targets against a stationary background. The oscillator maintains phase coherence, which allows the system to effectively process the Doppler shift caused by moving objects, enhancing target detection and discrimination. This stability is essential for improving signal-to-noise ratios and ensuring accurate tracking of targets in various operational environments.
Radar Is Short For?
Radio Detection And Ranging
What are radar and radio beam?
Radar (Radio Detection and Ranging) is a technology that uses radio waves to detect and locate objects, such as aircraft or ships, by emitting radio waves and analyzing the reflected signals. A radio beam is a directed stream of radio waves, which can be used for communication or radar applications. In radar systems, the radio beam is focused to enhance detection capabilities and reduce interference from other sources. Both technologies rely on the transmission and reception of electromagnetic waves to gather information about the environment.
What do lasers convert electrical signals into pulses of?
coherent light
Why non-coherent detector is impossible for PSK?
Why not? It is possible. Try to search for "Non-coherent sequence detection"
What is non coherent detection?
Non-coherent detection uses a product detector with a beat frequency oscillator to detect Morse code, CW transmissions or single-side band. It does not need carrier phase information at the receiver.
What is the difference between coherent and non coherent precipitaion hardening?
In Coherent demodulation the incoming signal are in phase with the local oscillator signal. This type of detection used in satellite standards because direct uplink and downlink transmission and reception respectively through earth station hub. But in non coherent demodulation there is a phase discontinuouty due fading of the channel. This type of detection used in terrestrial applications (mobile wireless standards).
What is difference between a coherent detector and envelop detector?
What the difference between envelop and coherent detection of AM signals
What is non coherent detector?
A non coherent detector is a type of device that does not need a receiver carrier to be phase locked to a transmitter carrier. A coherent detector demodulates signals.
What is the difference between coherent demodulation and non coherent demodulation?
In case of coherent demodulation carrier used for demodulation purpose is in phase and frequency synchronism with carrier used for modulation purpose. For non-coherent demodulation it is not in synchronism.
What has the author Jason Barry Brent written?
Jason Barry Brent has written: 'Coherent detection of QAM signals in land mobile radio'
What is difference between synchronous detection and envelop detection?
Synchronous detection, also known as coherent detection, involves multiplying the incoming signal with a reference signal that is phase-aligned, allowing for accurate recovery of the signal even in the presence of noise. Envelop detection, on the other hand, is a simpler method primarily used for amplitude modulation (AM) signals, where the envelope of the modulated signal is extracted to retrieve the original message. While synchronous detection is more complex and effective in various conditions, envelope detection is easier to implement and is often used in applications where precise phase information is not critical.
What has the author John Ralph Ragazzini written?
John Ralph Ragazzini has written: 'The effect of fluctuation voltages on linear detection' -- subject(s): Interference, Radio, Receivers and reception
Is frequency range of mobile communication is greater than FM?
There is no answer to this question, it needs to be reworded into a coherent form. Most mobile communications use F.M. (analog systems) or some form of digital transmission/reception.
where can I find information about class 2 transformer online?
linear receiver. The more difficult case of a nonlinear receiver is deferred to Section 2.12. Consider the case of DSB-SC modulation Figure 2.36 shows the model of a DSB-SC receiver using a coherent detector. The use of coherent detection requires multiplication
What is the full form of the abbreviation COHO in Radar?
In radar terminology, COHO stands for "COherent Heterodyne Oscillator." It refers to a type of oscillator used in coherent radar systems to mix signals and enhance the detection of targets by improving signal-to-noise ratios. This technology is crucial for applications requiring precise measurement and identification of objects.
