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A Sky Wave Positioning Method Applied to Loran System

A positioning method and sky wave technology, applied in positioning, radio wave measurement systems, instruments, etc., can solve problems such as small scope of action, and achieve the effect of wide spread of sky waves and improved coverage.

Active Publication Date: 2020-08-18
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a sky-wave positioning method applied to the Roland system, which solves the problem that the existing positioning methods in the prior art are all based on ground-wave signals, require station chains to support positioning, and have a small range of action

Method used

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  • A Sky Wave Positioning Method Applied to Loran System
  • A Sky Wave Positioning Method Applied to Loran System
  • A Sky Wave Positioning Method Applied to Loran System

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Embodiment

[0043] This embodiment provides a sky wave positioning method applied to the Roland system, which is specifically implemented according to the following steps:

[0044] Step 1: Assuming that the radius of the earth is r=6371km, the height of the ionosphere h=70km, the speed of light C=299792458m / s, and the refractive index of air N=1.0003, the coordinates of the four sky-wave transmitting stations in Raoping, Rongcheng, Xuancheng and Hezhou are shown in Table 1 Shown:

[0045] Table 1

[0046] station name longitude latitude Height (unit m) Xuancheng 138°09′53″ 09°32′45″ 400 Rongcheng 122°19′26″ 37°03′52″ 400 Raoping 116°53′45″ 23°43′26″ 400 He County 111°43′10″ 23°58′03″ 400

[0047] Received the Luolan signal from Raoping, Rongcheng, Xuancheng and Hezhou Luolan stations, and observed the receiving time within seconds as follows:

[0048]

[0049] 10.00333404798551371s, 10.00393025351481085s], local receive day seconds τ...

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Abstract

The invention discloses a sky wave positioning method applied to a LORAN system. The method is particularly implemented according to the following steps of: step 1, determining a propagation distancedbl of a sky wave according to a local arrival time tau rec and a transmission time tau tran; step 2, judging whether a sky wave propagation model is an illumination area model or a shadow area modelaccording to the size of the dbl; step 3, solving pseudo-range observation quantity rho of a sky wave receiving point and a transmission point; and step 4, simultaneously receiving the sky waves transmitted by the n sky wave transmitting stations by using a local LORAN receiving device to form an equation, and obtaining a sky wave receiving position x equal to [x, y, z] <T> and a local clock difference delta t. The sky wave positioning method applied to the LORAN system solves the following problems: the positioning methods existing in the prior art are based on ground wave signals, a stationchain is needed for the positioning, and the action range is small.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing methods, and relates to a sky wave positioning method applied to a Roland system. Background technique [0002] The Loran system is a ground-based long-wave long-range wireless navigation system. It adopts the hyperbolic positioning principle to realize two-dimensional positioning. However, due to the complex environment along the ground wave propagation and the large attenuation of the ground wave propagation amplitude, the Roland system can only cover the area near the Roland station and the sea area. In recent years, the Roland sky-ground wave separation technology has been greatly improved, and the ionospheric model estimation is more accurate, so that the Roland system can use the sky wave with a longer propagation distance for positioning, and the former Roland positioning is based on the ground wave signal, which requires the support of the station chain Positioning, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/10
CPCG01S5/10
Inventor 席晓莉张恺张金生刘江凡
Owner XIAN UNIV OF TECH
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