What is antenna sensitivity?
Definition: The sensitivity is the smallest signal we can put in to get a specified minimum SNR out of the system or component. The noise generated inside the system or component is what limits the sensitivity. This degrades the system sensitivity and increases the antenna gain needed.
What is radar sensitivity?
The receiver sensitivity measurement determines the lowest possible power (MDS, Minimum Detectable Signal, or Minimum Discernible Signal) at the input of a receiver with which the radar can still detect a target. This measurement provides an important indication of the performance of a radar.
How is radio sensitivity measured?
To calculate receiver sensitivity, we add the overall noise figure of the receiver to the noise floor. This quantifies the noise floor at the input to the demodulator. The signal must be higher than the noise floor by the carrier to noise ratio required for a desired signal quality.
What is gain sensitivity?
Higher amplifier gain equals higher input sensitivity, meaning a lower input level is required to reach maximum output power. Amp gain primarily affects the amount of headroom for the system. Adjusting gain (sensitivity) should be utilized to optimize the ratio of amplifier headroom to noise floor.
What is the principle of CW radar?
Principle of Operation. As opposed to pulsed radar systems, continuous wave (CW) radar systems emit electromagnetic radiation at all times. Conventional CW radar cannot measure range because there is no basis for the measurement of the time delay.
What is a common receiver sensitivity level range?
Receiver sensitivity is a measure of the minimum signal strength that a receiver can detect. It tells us the weakest signal that a receiver will be able to identify and process. The typical range for receiver sensitivity of various RF modules is from -50 to -100 dBm.
Is there a way to measure 20 dB quieting?
To measure 20 dB quieting, connect an AC voltmeter across the speaker leads. With no signal into the receiver, open the squelch. Adjust the volume control to produce something around 1 or 2 volts on the voltmeter.
How is the sensitivity of a FM radio measured?
As you increase this signal level, the receiver noise will start to decrease. This is the “quieting” effect that FM is so well known for. Adjust the RF level until the AC voltmeter reads 10% of, or 20 dB lower than, the value you had with no signal. The amplitude of the RF signal is now the 20 dB quieting sensitivity of the receiver.
How much RF do you need to quiet a speaker?
20 dB quieting is just what it says – how much RF you have to put in to quiet the speaker output by 20 dB. 12 dB SINAD is how much modulated signal you have feed the receiver in order to reduce the noise and distortion by 12 dB.
How is the sensitivity of a signal related to noise?
In general, whil e processing signals, the higher the power level at which the s ensitivity is set, the fewer the number of false alarms which will be processed. Simultaneously, the probability of detection of a “good” (low-noise) signal will be decreased. Sensitivity can be defined in t wo opposite ways, so discussions can frequently be confusing.
