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Radio navigation system with frequency spreading and hopping system

A technology of radio navigation and spread frequency hopping, which is applied in the field of radio navigation, can solve the problems such as the poor ability of the direct spread system to resist single-frequency interference, narrow-band interference and tracking interference, increase the complexity of the system, and the serious near-far effect, etc., to achieve strong Anti-single-frequency interference, improve performance, and solve the effect of near-far effect

Inactive Publication Date: 2011-05-11
HARBIN ENG UNIV
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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

Method used

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  • Radio navigation system with frequency spreading and hopping system
  • Radio navigation system with frequency spreading and hopping system
  • Radio navigation system with frequency spreading and hopping system

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Embodiment Construction

[0022] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0023] combine figure 1 and figure 2 . The radio navigation system of the spread frequency hopping system consists of N transmitting stations and navigation receivers distributed in different positions, wherein N≥3; the transmitting station consists of a signal source 1, an information encoder 2, a spreading frequency hopping modulation module 3, High-pass filter 4 and power amplifier 5 are made up of, and navigation receiver is made up of low noise amplifier 6, radio frequency front-end 7, spread frequency hopping synchronization module 8, observation quantity extraction module 9, navigation message extraction module 10 and navigation solution module 11; The source 1 is connected to the information encoder 2, the information encoder 2 is connected to the spread frequency hopping modulation module 3, the spread frequency hopping modulation module 3 is connected...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02G01S5/14
Inventor 沈锋赵彦雷徐定杰王伟郝燕玲薛冰韩续红吕东泽祖秉法孙枫
Owner HARBIN ENG UNIV
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