Gps speed limiter.Handheld GPS jammer

　　Portable GPS jammer capable of countering various civilian GPS frequencies (L1 L2 L3 L4 L5), LoJack, and GLONASS

　　But if the frequency of GPS signal deception is low, it may be a bigger problem. When the signal is disturbed, the device will stop working, which is obvious to the user. When a signal is deceived by a forged signal, the device will "lie", and users are usually not aware of this deceptive behavior. Deception is more complex than interference, requiring users to recreate complex rough collection (C/A) code. The C/A code rate is 1.023 million bits per second. Each GPS satellite not only broadcasts its own unique 1023 bit C/A code, but also repeats its C/A code every millisecond. Widely used signal generators can be used to achieve deception.

　　Measurement is the interception and replay of navigation signals. Meaconing avoids the burden of implementing complex GNSS signal structures and C/A code generation, and also leads to incorrect PNT information provided by the GNSS receiver, as the receiving and rebroadcasting processes change the relative delay of the GNSS signal, such as comparing it with the relative delay of the real GNSS signal at the receiver location. These signals are rebroadcasted at a received frequency and higher power than the original signal to confuse the navigation of the target. In some cases, the signal will initially be rebroadcasted exactly as received, but then slowly change over time to further deceive the receiver.

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Factors related to GPS satellites

GPS DOP and Active Satellites (GSA)