This happens regularly, both unintentionally (local interferences and RF pollution) and intentionally (intentional interferences or fake signal), otherwise known as GNSS jamming and spoofing.
Interferences and Jamming
Unintentional interferences are commonly generated by a variety of devices. Signals generated close to or within the GNSS spectrum may cause an issue. It is, for example, common for USB3.0 devices or some LIDAR sensors to create interferences in the GPS L1 band (1575.42 MHz +/-10 MHz), causing GNSS receivers to fail to provide an accurate position unless proper shielding is added.
Some people or organizations may intentionally create interferences to prevent GNSS receivers from working in a specific area. This is called jamming, the voluntary interference of GNSS signals by transmitting powerful radio frequency signals that overwhelm the weaker GNSS signals.
It is important to note that jamming is not limited to war actions. Many jamming situations are caused by low-cost GPS jammers that are, often illegally, used to prevent a car or a truck position tracking.
Spoofing
Spoofing, on the other hand, involves the creation of counterfeit GNSS signals that fool receivers into calculating false positions and providing inaccurate positioning information.
While jamming is a relatively simple and inexpensive attack, spoofing requires much more advanced equipment and knowledge to be able to carefully mimic the GNSS signals. Note that spoofing is often combined with jamming: it allows the spoofing of only a subset of the GPS signals rather than all the signals at once, making it significantly easier.
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