Interference with GPS positioning typically involves transmitting electromagnetic waves with frequencies similar to or equal to the GPS signal, in order to submerge or distort the received GPS signal. The following are some common methods of interfering with GPS positioning:

1. Continuous wave interference:
This method directly submerges the GPS signal by emitting continuous electromagnetic waves with the same frequency as the GPS signal. Causing the receiver to be unable to correctly demodulate satellite signals.

2. Pulse interference:
The pulse jammer sends short and strong electromagnetic wave pulses. These pulses can temporarily submerge GPS signals, causing the receiver to lose positioning information during the pulse period.

3. Deceptive interference:
Deceptive jammers send forged GPS signals that have similar characteristics to real GPS signals but carry incorrect location information. If the receiver is deceived, it may calculate the wrong position.

4. Noise interference:
The noise jammer generates random electromagnetic waves that mix with GPS signals, increasing the noise level of the signal. Make it difficult for the receiver to distinguish between useful signals and noise.

5. Spectrum hijacking:
Spectrum hijacking is an advanced interference technique. Attempting to control or tamper with the behavior of the receiver by occupying the GPS frequency band and sending specific signal patterns.

6. Physical occlusion:
Blocking the propagation of GPS signals through physical obstacles such as buildings, mountains, etc. It can also achieve the effect of interfering with GPS positioning.

7. Selective interference:
Selective interference refers to the targeted interference of specific GPS signals or satellite signals. Instead of completely interfering with all GPS signals.

8. Time deception:
Deceiving the receiver’s clock synchronization mechanism by sending delayed GPS signals. Causing the receiver to calculate incorrect time information, thereby affecting the accuracy of the location.

It should be noted that GPS signal interference may violate laws and regulations, and may pose a security threat to multiple fields such as aviation, navigation, and communication. Therefore, GPS signal interference is generally not encouraged or allowed to occur arbitrarily, except in specific environments.