Subelement C: Receiving Systems – 10 Key Topics – 10 Exam Questions – 4 Drawings— Topic 25: Sea Clutter - STC
Question 8-25C5
Element 8 (RADAR)What circuit controls the suppression of sea clutter?
Explanation
The STC (Sensitivity Time Control) circuit is specifically designed to control the suppression of sea clutter in radar systems. Sea clutter consists of reflections from nearby waves and chop, which are very strong at short ranges and can obscure actual targets.
The STC circuit works by automatically reducing the receiver's gain for echoes arriving from very close ranges, then gradually increasing the gain as the range (and thus time after transmission) increases. This effectively attenuates the strong, close-in clutter signals without significantly affecting weaker target echoes at longer distances.
A) The EBL (Electronic Bearing Line) circuit is a display function used for measuring bearings on a radar screen, not for clutter suppression.
C) The local oscillator is part of the receiver's frequency conversion stage and does not control clutter.
D) An audio amplifier is used for amplifying sound, which is not directly involved in suppressing radar video clutter.
Related Questions
8-25C3 Sea return is:8-25C4 Sea clutter on the RADAR scope cannot be effectively reduced using front panel controls. What circuit would you suspect is faulty?8-25C6 The sensitivity time control (STC) circuit:8-26C1 Prior to making “power-on” measurements on a switching power supply, you should be familiar with the supply because of the following:8-26C2 A constant frequency switching power supply regulator with an input voltage of 165 volts DC, and a switching frequency of 20 kHz, has an “ON” time of 27 microseconds when supplying 1 ampere to its load. What is the output voltage across the load?