Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Low-orbit navigation enhancement system

A system-enhancing and signal-enhancing technology, applied in the field of satellite navigation, can solve problems such as difficult to meet the high-precision application requirements of unmanned driving, and achieve the effect of accelerating the positioning convergence process, fast geometric movement, and enhancing service availability

Pending Publication Date: 2021-11-02
XIAN INSTITUE OF SPACE RADIO TECH
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional high-precision positioning has a convergence time of 20 to 30 minutes, which is difficult to meet the high-precision application requirements of unmanned driving requiring second-level convergence. How to achieve fast-converging high-precision positioning services is a challenge for PNT services

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low-orbit navigation enhancement system
  • Low-orbit navigation enhancement system
  • Low-orbit navigation enhancement system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Such as figure 1 As shown, the present invention provides a low-orbit navigation enhancement system, which includes a low-orbit navigation enhancement satellite constellation. The low-orbit navigation enhancement satellite constellation is a low-orbit constellation composed of a plurality of low-orbit navigation enhancement satellites. Quadruple and above coverage, that is, the number of low-orbit satellites visible at any time on the ground is no less than four. The low-orbit navigation enhancement satellites have user downlinks and user uplinks, and the low-orbit navigation enhancement satellites It has an inter-satellite link; the visible low-orbit satellite refers to a visible low-orbit satellite with an elevation angle above 5°.

[0061] The low-orbit navigation enhancement satellite generates and broadcasts the first navigation enhancement signal, the first navigation enhancement signal carries the low-orbit navigation enhancement message, the low-orbit navigation...

Embodiment 2

[0115] The low-orbit satellite of the present invention generates and broadcasts a high-security signal with an authentication function, which has the characteristics of text authentication and spread-spectrum code authentication. The schematic diagram of the high-security signal structure is as follows Figure 5 shown.

[0116] The low-orbit navigation enhanced message is an encrypted message. Correspondingly, the navigation user terminal performs security authentication after receiving the low-orbit navigation enhanced message;

[0117] The process of encrypting the low-orbit navigation enhanced message by the low-orbit navigation satellite is as follows:

[0118] S2.1. Map the low-orbit navigation enhanced message to the first hash data hash1 with a fixed bit length through the HASH function, and then encrypt the first hash data hash1 with a private key to obtain a digital signature DS; standard non- Symmetric encryption technology, such as RSA encryption technology, encry...

Embodiment 3

[0129] In terms of service availability, the urban environment is the main application scenario of GNSS. However, high-rise buildings, viaducts, tree shade, etc. in the urban environment cause GNSS signal attenuation and even service interruption, which greatly affects service availability. Improving service availability in challenging environments is the direction of PNT services.

[0130] Preferably, the low-orbit navigation enhancement satellite also generates and broadcasts a second navigation enhancement signal, that is, the low-orbit navigation enhancement satellite generates and broadcasts an L-band triple-frequency navigation enhancement signal + UHF / VHF navigation enhancement signal. The second navigation enhancement signal is a spread-spectrum ranging signal, which is located in the UHF or VHF frequency band, and its landing power is higher than that of the GNSS signal, even 10dB higher than the GNSS signal, so that the user terminal can receive the second navigation ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a low-orbit navigation enhancement system which carries a GNSS monitoring receiver on a low-orbit navigation enhancement satellite to realize precise orbit determination and autonomous and flexible generation of GNSS precise correction messages. Under the control of a time-frequency reference provided by a high-stability clock, a low-orbit navigation enhancement signal is generated, a GNSS precise correction message and a broadcast message and a precise correction message of a low-orbit satellite are broadcasted, PPP and PPP-AR are supported, and precision enhancement is realized. A downlink signal broadcasts the low-orbit navigation enhancement signal, broadcasts an atmospheric correction message, supports PPP-RTK positioning and accelerates convergence, and at the same time, broadcasts a low-orbit L-band three-frequency navigation enhancement signal, realizes rapid ambiguity fixation, and realizes second-level convergence high-precision positioning calculation and time service. When a high-power low-orbit navigation enhancement signal is broadcasted, high-availability positioning calculation and time service are realized; meanwhile, narrowband signal components are broadcasted, and low-energy-consumption positioning service is supported. And a message authentication and spreading code authentication mode is adopted, so that the service of security enhancement is realized.

Description

technical field [0001] The invention belongs to the field of satellite navigation, in particular to a low-orbit navigation enhancement system. Background technique [0002] The Global Navigation Satellite System (GNSS) can provide global users with all-weather, all-time, high-precision positioning, navigation and timing (PNT) services, and plays a huge role in various fields, meeting people's basic needs for PNT services. However, with the expansion of the emerging field of GNSS projects, new requirements for the performance of PNT services are becoming more and more prominent. [0003] In terms of positioning services, intelligent transportation represented by unmanned driving has a strong demand for real-time centimeter-level high-precision positioning. Real-time high-precision positioning based on GNSS is one of the positioning and navigation systems used by unmanned driving. The convergence time of traditional high-precision positioning is 20 to 30 minutes, which is di...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/03G01S19/07G01S19/37G01S19/44
CPCG01S19/03G01S19/07G01S19/37G01S19/44Y02D30/70
Inventor 蒙艳松严涛王瑛边朗周昀田野李天
Owner XIAN INSTITUE OF SPACE RADIO TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com