What is minimum detectable signal in radar communication?
What is minimum detectable signal in radar communication?
Minimum Detectable Signal (MDS) is a specific value of minimum receivable power (Prmin) The minimum detectable signal is defined as the useful echo power at the antenna, which gives at the output of the IF amplifier (just before detection), a signal which lies 3 dB above the mean noise level.
How is MDS measured?
The MDS (Minimum Discernible Signal) receiver sensitivity measurement technique. The MDS (Minimum Discernible Signal) is defined as a signal that achieves a 3dB audio voltage gain over the internally generated noise from within the receiver alone….Step 4.
| Signal Generator output in dBm | -50dBm |
|---|---|
| Sep Attenuator | -35dB |
What is minimum SNR requirement?
10 dB to 15 dB: is the accepted minimum to establish an unreliable connection. 15 dB to 25 dB: is typically considered the minimally acceptable level to establish poor connectivity. 25 dB to 40 dB: is deemed to be good. 41 dB or higher: is considered to be excellent.
What is minimum detectable optical power?
Minimum Detectable Optical Power The NEP of a detector is the optical power incident to. the detector that needs to be applied to equal the noise. power from all sources in the detector; in other words, NEP is the optical power that results in an SNR of 1 [2].
On which factors the minimum detectable signal depends?
The accuracy of the radar range equation is only as good as the input data. Minimum detectable signal (Pmin) depends on receiver bandwidth (B), noise figure (F), temperature (T), and required signal-to-noise ratio (S/N). A narrow bandwidth receiver will be more sensitive than a wider bandwidth receiver.
What is an acceptable SNR for WIFI?
Generally, a signal with an SNR value of 20 dB or more is recommended for data networks where as an SNR value of 25 dB or more is recommended for networks that use voice applications.
What sets the lower limit of detectable optical power in optical detectors?
dark current
Theoretically there is no lower limit for the optical power that a photodiode can detect. However, the dark current limits the minimum detectable optical power by reducing the signal to noise ratio to less than one.