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Medium short wave spread spectrum frequency hopping radio navigation system pseudo range observed quantity extraction method

A technology for radio navigation and pseudorange observation, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., can solve the difficulty of carrier phase observation, the discontinuity of carrier phase, and the inability to popularize spread frequency hopping. problems in the field of radio navigation, etc., to achieve the effect of shortening the time of observation

Inactive Publication Date: 2013-10-30
HARBIN ENG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, the continuous hopping of the carrier frequency in the spread frequency hopping system brings problems such as discontinuous carrier phase and carrier Doppler frequency shift, which makes it more difficult for the spread frequency hopping radio navigation system to extract carrier phase observations.
None of the existing observation extraction methods, including the above method, can overcome these problems and cannot be extended to the field of spread frequency hopping radio navigation
At present, there are no research results on the extraction method of radio navigation pseudo-range observations in the spread frequency hopping system

Method used

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  • Medium short wave spread spectrum frequency hopping radio navigation system pseudo range observed quantity extraction method
  • Medium short wave spread spectrum frequency hopping radio navigation system pseudo range observed quantity extraction method
  • Medium short wave spread spectrum frequency hopping radio navigation system pseudo range observed quantity extraction method

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Embodiment approach 1

[0039] Implementation Mode 1: Combining figure 1 with Figure 4 Describe this specific implementation mode, in this specific implementation mode, the measures to eliminate the impact of carrier frequency hopping on the extraction of pseudorange observations are as follows:

[0040] In the spread frequency hopping system, the carrier is constantly hopping with time, which brings problems such as carrier phase discontinuity and Doppler frequency shift hopping; these problems have serious adverse effects on the extraction of pseudo-range observations, such as interference The normal operation of the carrier tracking module leads to slow tracking speed, frequent loss of lock or cycle slip, resulting in slow extraction speed or even extraction of wrong carrier phase observations; in order to eliminate the impact of these problems, the following measures are taken;

[0041] 1. Adopt an optimized design method when designing each frequency hopping frequency: set the chip length of t...

Embodiment approach 2

[0045] Implementation Mode 2: Combining figure 2 , image 3 with Figure 4 Illustrate this specific implementation mode, in this specific implementation mode, the method for extracting pseudo-range observations of the radio navigation system of the spread frequency hopping system is divided into the following steps:

[0046] 1. Extraction of frequency hopping code ranging observations: first extract observations of the order of half a frequency hopping chip length from the frequency hopping capture module, and then extract less than half a frequency hopping chip length from the frequency hopping tracking module level of observations.

[0047] The specific method of extracting pseudo-range observations of the order of half a frequency-hopping chip from the frequency-hopping acquisition module is as follows: set T c_fh is the width of a frequency hopping symbol, and the unit is second; the local frequency hopping code slides half a chip each time, and for different navigatio...

Embodiment approach 3

[0108] Embodiment 3: The difference between this specific embodiment and specific embodiment 2 is that: using the frequency hopping code to measure the distance d fh The specific method of predicting the capture position of the direct-spreading code and shortening the extraction time of the ranging observation of the direct-spreading code is as follows;

[0109] The frequency hopping code can only be captured after a certain shift of the local frequency hopping code, and the local direct spread code can also be captured by the same shift, but the distance measurement of the frequency hopping code has a large error. Therefore, the position after the direct spread code slides the same distance is the predicted capture position, and the predicted error is the ranging error of the frequency hopping code ranging; the periodicity of the direct spread code can simplify this sliding process, and the frequency hopping code d fh , then the predicted direct spread code displacement m p...

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Abstract

The invention provides a medium short wave spread spectrum frequency hopping radio navigation system pseudo range observed quantity extraction method. The method includes: (1) frequency hopping code ranging observed quantity is extracted; (2) direct sequence code ranging observed quantity is extracted, firstly decimal part of direct sequence code ranging observed quantity is extracted, namely half direct sequence code length of pseudo range observed quantity is extracted from a direct sequence capturing module firstly, and then pseudo range observed quantity less than half direct sequence code length is extracted from a direct sequence tracking module; (3) carrier phase observed quantity is extracted, firstly carrier phase observed quantity less than a full period is extracted from a carrier tracking module, and then ambiguity of carrier phase in the full period is calculated. The invention can realize real-time resolving of ambiguity of carrier in full period and rapid extraction of high accuracy pseudo range observed quantity. The observed quantity extraction method can effectively improve the overall effectiveness of medium short wave spread spectrum frequency hopping radio navigation system.

Description

technical field [0001] The invention relates to the field of spread frequency hopping radio navigation, in particular to a method for extracting pseudorange observations of a medium and short wave spread frequency hopping radio navigation system. Background technique [0002] Spread frequency hopping technology, also known as FH / DS hybrid spread spectrum technology. It combines the advantages of direct spread technology and frequency hopping technology. Compared with simple direct spread technology, hop spread spectrum technology can significantly improve the processing gain of the system, effectively overcome the "near and far effect", and can greatly improve the anti-jamming of the radio navigation system , Anti-interception and anti-destruction capabilities. Therefore, it has broad application prospects and important strategic significance to apply the spread frequency hopping technology to the radio navigation system. [0003] The key to realize high-precision dynamic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/44
Inventor 沈锋吴述敏刘丹杨鸣宇李洲李颖王天华孙丽丽
Owner HARBIN ENG UNIV
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