A navigation anti-interference enhanced load system and method based on low-orbit satellites

Abstract

The invention relates to a navigation anti-interference enhancement load system and method based on a low-orbit satellite. The system comprises a GNSS signal receiving antenna, a GNSS signal down-conversion module, a baseband processing module, a navigation anti-interference signal upper side frequency module, a power amplifier module, a navigation anti-interference signal broadcast antenna, a frequency synthesizer and a constant temperature crystal oscillator. Through a navigation anti-interference signal broadcasted by a navigation anti-interference enhancement load, sensitivity and an anti-interference ability of a ground navigation receiver are increased, and availability of a ground satellite navigation receiver in a complex environment is solved.

Description

technical field [0001] The invention relates to a low-orbit satellite-based navigation anti-interference enhanced load system and method, belonging to the technical field of satellite navigation. Background technique [0002] Satellite navigation has been widely used both in the military field and in the civilian field. Taking GPS as an example, it has been widely used in various fields of the national economy, including energy, communication, finance, transportation, electric power and other important fields of the national economy. In terms of military use, various precision-guided weapons and unmanned fighters are increasingly dependent on satellite navigation systems, and satellite navigation has become a "multiplier" for the performance of weapons and equipment. In order to continue to maintain its dominance in the field of satellite navigation in the world, the United States is making every effort to build a modern GPS. In order to get rid of its dependence on GPS and...

AI Technical Summary

Problems solved by technology

[0006] Although the basic satellite navigation system is enhanced by spot beams, although it provides a certain power enhancement, the strength is limited by the distance attenuation of more than 20,000 kilometers, which still cannot fully meet the requirements of navigation warfare. The influence of physical objects and improving the DOP value of the system are not helpful; using airborne pseudo-satellite technology, this method requires long-term coverage of the entire combat area, requires a large number of drones or airships, and increases operating costs. No guarantee; using complex receiver technology, time-domain interference suppression technology and transform domain interference suppression technology can only suppress single-frequency or narrow-band interference, and have no suppression effect on broadband suppression interference

Airspace interference suppression adopts the form of antenna array, which will significantly increase the complexity and cost of the receiver, and increase the difficulty of using the receiver, which is not conducive to the large-scale equipment and use of the troops

[0007] In short, there is currently no high-power navigation anti-jamming enhancement method that satisfies the complex electromagnetic environment in wartime and navigation anti-jamming enhancement method that satisfies wide-area coverage.

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