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A Positioning Method Based on Space-Based Signals of Opportunity

A positioning method and opportunity technology, applied in satellite radio beacon positioning systems, instruments, measuring devices, etc., can solve the problem of GNSS systems that are difficult to provide PNT services safely/stable/continuously, sensitive to terrain occlusion/physical barriers, anti-jamming/ Weak destruction ability and other problems, to achieve the effect of improving anti-jamming ability, strong anti-cracking and deception ability, and strong anti-interference ability

Active Publication Date: 2021-04-20
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The shortage of resources on the satellite leads to weak signal power (signal inherent vulnerability), and is sensitive to terrain occlusion / physical barriers, resulting in the existence of "shadow areas" in services; the system constellation / signal is transparent and open, and is vulnerable to suppressive interference and precise physical attacks by opposing parties. Weak anti-interference / destruction ability
The above-mentioned system defects and deficiencies make it difficult for the GNSS system to provide PNT services safely / stablely / continuously

Method used

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  • A Positioning Method Based on Space-Based Signals of Opportunity
  • A Positioning Method Based on Space-Based Signals of Opportunity
  • A Positioning Method Based on Space-Based Signals of Opportunity

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Embodiment Construction

[0048] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] The present invention is a positioning method based on space-based signals of opportunity. The applicable environment of the method includes a ground-based reference network composed of multiple monitoring terminals. The specific process is as follows: figure 1 Shown:

[0050] (1) Space-based signal of opportunity feature extraction and time-of-arrival measurement

[0051] Obtain space-based communication satellites and beam center parameters according to satellite broadcast channels; typical space-based communication satellite signals adopt TDMA signal format, and its frame structure mainly includes: synchronous sub-framing (also known as reference sub-framing, RB) and data (service) sub-framing (DB) two parts, the specific structure see figure 2 shown.

[0052] In the TDMA frame structure, the synchronous sub-frame is usually sen...

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Abstract

The invention provides a positioning method based on a space-based signal of opportunity, the process is: (1) acquiring the moment when the signal of opportunity arrives at a monitoring terminal; (2) selecting one of the source stars of a plurality of received space-based signals of opportunity as a reference (3) according to the inter-satellite time delay difference, the rough ephemeris position of the reference star and the source star, and the position information of the monitoring terminal, carry out hyperboloid space-time distribution model modeling; ( 4) The user terminal listens to the signal of opportunity in the hotspot service area, obtains the inter-satellite delay difference between the reference star-source star and the user terminal, and constructs the time-space distribution of the inter-satellite delay difference based on the screened source star and monitoring reference station model to realize user terminal positioning and navigation. The available signal sources of the present invention are non-navigation satellites / constellations such as space-based communication satellites, and the features of the space-based communication signals are randomized, diversified, and concealed, thereby providing a new realization approach for positioning and navigation services.

Description

technical field [0001] The invention belongs to the technical field of radio navigation communication, in particular to a positioning method based on a space-based signal of opportunity. Background technique [0002] Global Navigation Satellite System (GNSS), as the current mainstream positioning and navigation system, can provide military / civilian users with high-precision / reliable positioning, navigation and timing (Position, Navigation and Time, PNT) function. Extensive and effective applications have penetrated into all fields of the national economy and play a pivotal role. [0003] The mature industrial promotion and technical application of the satellite navigation system have exposed the limitations and deficiencies of the system. The shortage of resources on the satellite leads to weak signal power (signal inherent vulnerability), and is sensitive to terrain occlusion / physical barriers, resulting in the existence of "shadow areas" in services; the system constella...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/42
CPCG01S19/425
Inventor 袁洪罗瑞丹徐颖欧阳光洲刘文学汪建明陈夏兰
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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