What is a "Gps Jammer To Signal Ratio"? The Most Authoritative Explanation.
What is a GPS signal jammer?
GPS receivers rely on low power microwave signals broadcast from GPS satellites. Signal jammers operate by overwhelming these satellite signals with higher power, but shorter range, radio signals, to create “noise” that tricks GPS tracking systems into thinking GPS signals are not available. This is also referred to as "spoofing".What are the civilian uses of GPS jamming?
There are a few civilian uses for jamming GPS signals, mostly privacy related, including the ability to conceal oneself or one’s vehicle in case it is being tracked by a GPS receiver.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.
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