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GNSS-like indoor navigation signal system design system

An indoor navigation and design system technology, applied in the field of satellite navigation, to achieve the effects of improving information acquisition time, improving anti-far and near effect, improving transmission rate and transmission reliability

Pending Publication Date: 2022-04-05
杭州北斗时空研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Locata system is a relatively mature indoor and outdoor positioning technology. The LocataLite pseudolite mainly adopts signal diversity transmission technology, mainly including frequency, space and polarization diversity technology, to suppress multipath fading caused by indoor multipath effects, but This device requires dedicated terminal positioning, and there are deficiencies in use

Method used

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  • GNSS-like indoor navigation signal system design system
  • GNSS-like indoor navigation signal system design system
  • GNSS-like indoor navigation signal system design system

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Embodiment 1

[0031] Such as Figure 1-6 As shown, the present invention provides a GNSS-like indoor navigation signal system design system, including;

[0032] Signal characteristics, including carrier frequency, signal modulation method, signal spreading code and signal working bandwidth, and the message information is broadcast by the indoor communication link;

[0033] The signal ranging code is generated, the ranging code rate is 20.46MHz, the code length is 1023, and the period is 50us;

[0034] Signal modulation, using BPSK to generate the required signal, such as image 3 shown;

[0035] Signal message, including message content, message frame header, message structure and verification method, message content such as Figure 4 As shown, the message structure is as follows Figure 5 shown;

[0036] The base station broadcasts, and the information sent by the base station is obtained by the user terminal, such as Figure 6 shown.

[0037] Further, the carrier frequency is 1575....

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Abstract

The invention discloses a GNSS (Global Navigation Satellite System)-like indoor navigation signal system design system, which comprises signal characteristics including carrier frequency, a signal modulation mode, a signal spreading code and a signal working bandwidth, and message information is broadcasted by an indoor communication link; signal ranging codes are generated, the rate of the ranging codes is 20.46 MHz, the code length is 1023, and the period is 50 us; signal modulation: adopting a BPSK mode to generate a required signal; and the signal telegraph text comprises telegraph text content, a telegraph text frame header, a telegraph text structure and a verification mode, and is broadcasted through the base station. According to the invention, a larger bandwidth design is adopted in the signal design, a better anti-multipath capability is provided, and the stable acquisition probability of the signal is improved; a short-period pulse design is adopted, so that mutual interference between signals is reduced; a message protocol suitable for an indoor environment is defined; the indoor navigation message transmission mode is changed, the information acquisition time is improved, and the analysis time is shortened.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a GNSS-like indoor navigation signal system design system. Background technique [0002] The base station signals currently used in the indoor environment are generally divided into two categories. One is based on the positioning of indoor communication base stations, including WIFI, 4G / 5G mobile communication networks, Bluetooth, etc. The signal is generally poor and unstable in positioning. One is to introduce navigation signals indoors, mainly based on Japan's IMES system, Japan's indoor pseudolite positioning system IMES for GPS signals, and navigation chip manufacturers such as Broadcom have also launched corresponding GNSS / IMES navigation chips, and the IMES signal interface The agreement has been written into IS-QZSS-1.4 and incorporated into the construction of QZSS system. [0003] The Locata system is a relatively mature indoor and outdoor positioning tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/20G01S19/42
Inventor 王天保林城誉车洪峰王大维
Owner 杭州北斗时空研究院
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