Radio navigation system with frequency spreading and hopping system

Abstract

The invention relates to a radio navigation system with a frequency spreading and hopping system, solving the defects of poor capacity of resisting disturbance, easy crack and complex system structureof the existing radio navigation systems. The radio navigation system includes N sending stations and navigation receivers distributed on different positions, wherein N is high than or equal to 3; and a navigation message is processed by the operations of direct spreading modulation and frequency hopping modulation in a frequency spreading and hopping modulation module and then passes through a high pass filter and a power amplifier to be emitted outside by an antennae. At a receiving terminal, the signal received by the antennae passes through a low-noise amplifier and an RF front-end and then enters a frequency spreading and hopping synchronization module. The operations of frequency spreading and hopping are synchronous, and the step of synchronous frequency hopping is carried out firstly, and then the step of synchronous direct spreading is carried out. By utilizing the pseudodistance observed quantity presented by an observed quantity extraction module and the navigation messagepresented by a navigation message extraction module, a navigation resolving module resolves the positions of the receivers. The frequency spreading and hopping system greatly enhances the capacity ofresisting disturbance and crack and reduces the complexity of the radio navigation system system.

Description

(1) Technical field [0001] The invention relates to a radio navigation technology, in particular to a radio navigation system with an extended frequency hopping system. (2) Background technology [0002] Radio navigation systems play an important role in aviation and navigation, providing fast and reliable navigation and positioning information. However, an important problem in the radio navigation system is the problem of anti-jamming. The traditional radio navigation system generally adopts the pulse phase system, such as Roland C, Taika and so on. The navigation system of this system has low positioning accuracy, poor confidentiality, and is easily disturbed by the outside world. With the development of science and technology, the emergence of spread spectrum technology, direct spread technology is applied to the radio navigation system to improve its anti-jamming performance. GPS in the United States, GALILEO in Europe and COMPASS in China all adopt the system of dire...

AI Technical Summary

Problems solved by technology

The use of direct spread technology has greatly improved the anti-jamming capability of the radio navigation system, but the ability of the direct spread system to resist single-frequency interference, narrow-band interference and tracking interference is poor, and the near-far effect is serious

At the same time, the confidentiality and anti-interference of the direct spread system are guaranteed by increasing the length and rate of the pseudo code, which will inevitably increase the complexity of the system

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