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Rapid positioning method of binary TDOA/FDOA satellite-to-earth integration positioning system

A positioning method and positioning system technology, applied in the field of satellite positioning, to achieve the effects of strong anti-noise, fast positioning convergence speed, and high positioning accuracy

Inactive Publication Date: 2012-01-25
HARBIN INST OF TECH
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Problems solved by technology

[0011] The purpose of the present invention is to propose a fast positioning method in order to solve the problems of accurately and quickly estimating TDOA / FDOA and performing accurate and fast positioning in the double-star positioning system

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  • Rapid positioning method of binary TDOA/FDOA satellite-to-earth integration positioning system
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  • Rapid positioning method of binary TDOA/FDOA satellite-to-earth integration positioning system

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Embodiment Construction

[0038] The present invention accurately simulates the double-star TDOA / FDOA positioning process, acquires positioning parameters through advanced signal processing technology for target positioning, and at the same time analyzes the positioning accuracy in detail. The steps of its implementation are as follows:

[0039] 1. Construct a double-star TDOA / FDOA positioning model

[0040] The operation of the satellite is accurately simulated by the STK satellite simulation software, and the double-star positioning model is constructed to generate the position, speed and receiving signal of satellite 1 and satellite 2 at each moment.

[0041] Double star positioning system such as figure 1 As shown in the composition, in the geocentric fixed coordinate system (WGS), the TDOA and FDOA of the two-star received signals at time k are:

[0042] τ ( k ) = r 2 ...

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Abstract

The invention relates to a rapid positioning method of a binary TDOA / FDOA satellite-to-earth integration positioning system. According to the invention, problems that exist during accurate estimation of a TDOA / FDOA and rapid positioning in a binary positioning system can be solved. The method comprises the following steps that: a binary TDOA / FDOA positioning model is constructed; and a real-time combination estimation is carried out on a TDOA and an FDOA through a fourth order cumulant two dimensional separation parameter estimation method; object location is carried out through an IMM-UKF filtering method; and then, a relationship between a positioning precision and a signal to noise ratio of a receiving signal is analyzed; at last, a situation of an influence of all factors on a positioning error is analyzed. According to the invention, a complete and trusted assessment can be carried out on a positioning system; there is no requirement on a type of a signal that is emitted by a ground radiation source and thus the rapid positioning method has a strong adaptability and a wide application range; moreover, the method has good anti-noise and anti-interference capabilities; and a positioning convergence rate is high and a high positioning precision can be reached. Therefore, the invention has a high practical application value.

Description

technical field [0001] The invention belongs to the technical field of satellite positioning, in particular to a TDOA / FDOA joint parameter estimation and fast positioning method. Background technique [0002] In modern warfare, the use of electronic reconnaissance satellites to conduct large-scale and continuous long-term monitoring and tracking of enemy radar and communication systems has become an indispensable means in contemporary intelligence and reconnaissance. In the existing satellite positioning system, the double-star TDOA / FDOA joint positioning method reduces the number of platforms compared with the three-star and four-star positioning, and reduces the difficulty of system implementation and launch costs. Compared with the single-platform positioning method, it has Higher positioning accuracy and better real-time performance. Therefore, in the space-based electronic reconnaissance system, double-star positioning is a very potential solution. [0003] The basis ...

Claims

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Application Information

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IPC IPC(8): G01S19/33
Inventor 张坤姜义成
Owner HARBIN INST OF TECH
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