GPS suppressive interference mode

A suppressive jamming, GPS navigation technology, applied in the field of communication, can solve problems such as difficult to be effective

Pending Publication Date: 2018-09-21
YANGZHOU POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In deceptive jamming, single-frequency jamming can be easily dealt with by anti-jamming techniques such as time-domain and frequency-domain filtering, and it is more difficult to be effective against military GPS receivers with anti-jamming measures

Method used

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Embodiment Construction

[0010] The present invention will be described in detail below in combination with specific embodiments.

[0011] The spoofing interference method of the present invention is controllable interference, that is, suppressing interference is first implemented, forcing the GPS receiver to lose lock and enter a re-search state, and then reduce power to perform forwarding spoofing interference. In general, the jammers that implement deceptive jamming tend to be intelligent, which can accurately estimate the magnitude of the measurement value of the satellite signal received by the target, and can discretely add an appropriate undetectable offset to these measurements amount, so as to ensure the effectiveness of destruction with a small offset, and further reduce the risk of being detected. In addition, spoofing jamming does not require high power, and it only needs to be higher than the GPS satellite signal to achieve the goal, so spoofing jamming is not easy to be detected.

[001...

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Abstract

The invention discloses a GPS suppressive interference mode. The GPS suppressive interference mode is characterized in that the transmission rate of a GPS navigation message is 50b/s, and the code element of a pseudo-random sequence for spreading spectrum has a 1.023 Mb/s C/A code rate; 1 bit of GPS navigation message data code is extended to 20,460 bits; as the length of the C/A code is 1023, thecode element of one C/A code is repeated for 20 times in a chip of 20460 spread spectrum sequence codes; one C/A code is taken, and then a random sequence is generated; each bit of the random sequence is repeated for 1023 times, and the C/A code is multiplied by the random sequence to implement the spreading process; and after BPSK modulation, the front end of a receiver may encounter Gaussian white noise and human interference, and through a switch, GOLD code broadband interference is selected to be introduced. The GPS suppressive interference mode has the advantage that the broadband GOLD code interference signal has preferable interference effect.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a GPS suppression interference method. Background technique [0002] In today's information age, the GPS satellite navigation system occupies an increasingly important position and penetrates into various fields of civil and military use. This paper mainly aims at the needs of electronic countermeasures in modern warfare. How to effectively interfere with GPS signals is becoming increasingly important in various countries The main research direction against GPS. [0003] The GPS system consists of three sources: satellites, ground monitoring stations, and users, as well as two channels: the uplink channel for injecting navigation messages and control commands from the ground monitoring station into the satellites, and the downlink channel for broadcasting navigation messages to users from the satellites. In order to obtain the required navigation information, the GPS receive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21G01S19/18
CPCG01S19/18G01S19/21
Inventor 梅妍玭傅荣张得才
Owner YANGZHOU POLYTECHNIC COLLEGE
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