What is a "Signal To Jamming Ratio"? The Most Authoritative Explanation.
What is the formula for jamming to signal?
JAMMING TO SIGNAL (J/S) RATIO - CONSTANT POWER [SATURATED] JAMMING The following table contains a summary of the equations developed in this section. JAMMING TO SIGNAL (J/S) RATIO (MONOSTATIC) J/S = (Pj G ja4B R ) / (P t G t F) (ratio form)* or: 2How to reduce the J/S of a jamming signal?
C If the frequency of modulation is greater than the BW of the tracking radar reduce J/S by 20 Log (duty cycle). For example; if your jamming signal is square wave chopped (50% duty cycle) at a 100 Hz rate while jamming a 1 kHz bandwidth receiver, then the J/S is reduced by 3 dB from the maximum.What is the J/S ratio for jamming?
J-S Ratio (Monostatic) The ratio of the power received (P r1 or J) from the jamming signal transmitted from the target to the power received (P r2 or S) from the radar skin return from the target equals J/S. Note: To avoid having to include additional terms for these calculations, always combine any transmission line loss with antenna gain.What is a related mode of jamming?
A related mode is set-on jamming where a receiver measures the threat radar frequency and adjusts an oscillator to retransmit it. Ditto for a swept-spot jammer, one that sweeps an oscillator over a band of frequencies used by the radar receiver. Finally, there are a couple of electronic-warfare terms that apply to military maneuvers.
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