Digital Signal Detection
Shahram Shafie
Technical Engineering Management, Product Architect, and Systems Definer, Antenna, at ORTENGA
Analog signal and digital signal have different signal detection threshold.?
Digital signal detection threshold is lower than analog signal detection.
While analog signal detection has a gray performance, digital signal detection is binary.
Technically, regardless of analog or digital a signal is detected when the signal is above the detection amplitude threshold.?
Anything below the detection threshold amplitude is considered noise and ignored, while anything above the detection threshold amplitude is considered the signal of interest.
Therefore, the detection threshold differentiates signal from noise.
The detection threshold could be absolute in amplitude or relative to noise floor of the receiver via SINR or SNR.
The SINR or SNR is predetermined and programmed into the receiver FW.
Unlike communication signals where the receivers have error corrections capabilities due to redundancy, in radar applications there is no error correction, therefore there is a small chance of false alarm, i.e., appearance of target detection due to noise yet there is no actual target.
Consequently, signal detection threshold applies to radar signal for given false alarm rate.
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