Method for interfering satellite positioning system accuracy

Abstract

A method for interfering the positioning accuracy of satellite positioning system includes selectively receiving satellite signal of satellite positioning system by receiving antenna in said system, delaying received signal, amplifying delayed signal, emitting delayed and amplified signal to area required to be interfered by emitting antenna of satellite positioning system; setting emission antenna of said system far from location of receiving antenna in said system to let system not generate signal self - excitation

Description

technical field [0001] The invention relates to a method for interfering with the positioning accuracy of a satellite positioning system. Background technique [0002] The basic positioning principle of the satellite positioning system is: the satellite continuously sends its own ephemeris parameters and time information. After receiving the information, the user calculates the three-dimensional position, three-dimensional direction, movement speed and time information of the receiver. [0003] Satellite positioning system receivers can receive time information accurate to the nanosecond level that can be used for timing; forecast ephemeris for forecasting the approximate position of satellites in the next few months; broadcasting for calculating satellite coordinates required for positioning Ephemeris, with an accuracy of a few meters to tens of meters, is different for each satellite and changes at any time; and satellite positioning system info...

AI Technical Summary

Problems solved by technology

[0007] Use a jammer with the same frequency as the GPS to send continuous waves, which reduces the signal-to-noise ratio S / N received by the GPS receiver, resulting in the inability to navigate accurately

However, since the signal transmitted by this jammer is an uncoded random noise signal, the GPS system transmits a related signal. The GPS receiving terminal can easily distinguish the interference signal from the useful signal, and use a directional antenna and digital filtering to filter the interference signal. offset tone

At the same time, because the GPS system uses spread spectrum technology, it has excellent anti-random signal interference capability. When suppressing interference is used, a large interference signal power is required to interfere with the normal operation of the GPS receiving terminal.

So suppressive interference is not very effective

[0008] 2. Deceptive interference

But this is more difficult, because we don't know what sequence GPS uses to spread the spectrum

In particular, the random code left over from M-sequence spreading is theoretically impossible to crack! And even if it is cracked, the satellite positioning system only needs to replace the flattening pseudo code, and the jamming function of this deceptive jamming device will be invalid.

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