What type of interference sends false GPS signals?

What type of interference sends false GPS signals?

• A. Spoofing
• B. Jamming
• C. Terrain masking
• D. Multipath

Answer: (A)

The concept tested here is distinguishing deliberate counterfeit GPS signals from other types of interference. Sending false GPS signals is spoofing: a deliberate act of broadcasting counterfeit satellite signals that look legitimate to a receiver, guiding it to compute a wrong position, velocity, or time. This differs from jamming, which simply floods the band with noise or disruptive signals to prevent reception and does not provide usable navigation data. Terrain masking isn’t about signal manipulation but is a physical blockage by terrain that prevents line-of-sight to satellites. Multipath involves signals arriving at the receiver via multiple paths (for example, reflections off buildings), which can distort measurements but still comes from real satellites rather than fake ones. Spoofing is the mode that actively tries to deceive the receiver by presenting false data.

The concept tested here is distinguishing deliberate counterfeit GPS signals from other types of interference. Sending false GPS signals is spoofing: a deliberate act of broadcasting counterfeit satellite signals that look legitimate to a receiver, guiding it to compute a wrong position, velocity, or time. This differs from jamming, which simply floods the band with noise or disruptive signals to prevent reception and does not provide usable navigation data. Terrain masking isn’t about signal manipulation but is a physical blockage by terrain that prevents line-of-sight to satellites. Multipath involves signals arriving at the receiver via multiple paths (for example, reflections off buildings), which can distort measurements but still comes from real satellites rather than fake ones. Spoofing is the mode that actively tries to deceive the receiver by presenting false data.