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Indoor positioning system and method based on pseudolites

An indoor positioning and pseudolite technology, applied in the field of indoor positioning system based on pseudolite, can solve the problems of poor positioning accuracy, poor positioning police, poor geometric precision factor, etc.

Active Publication Date: 2014-09-10
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, when the pseudolite is used indoors, in tunnels, underground parking lots, etc., because the layout of the pseudolite station is limited by space, especially in the height direction, its geometric precision factor is very poor, resulting in poor positioning, especially in the height direction. Positioning accuracy is worse

Method used

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  • Indoor positioning system and method based on pseudolites
  • Indoor positioning system and method based on pseudolites
  • Indoor positioning system and method based on pseudolites

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Embodiment Construction

[0048] An indoor positioning system based on pseudolites, such as figure 1 As shown, it is mainly composed of 3 or more pseudolite base stations and receivers of user terminals arranged in the range of user activities.

[0049] Each pseudolite base station includes a base station temperature and air pressure sensor module, a message encoding module, a pseudo code generation module, a spread spectrum modulation module, a carrier modulation module, an up-conversion module and a transmitting antenna. The base station temperature and air pressure sensor module sends the collected temperature and air pressure information at the pseudolite base station to the message encoding module. The message encoding module encodes the measured temperature and pressure information of the pseudolite base station and the previously measured three-dimensional position information of the pseudolite base station into a message, and sends it to the spread spectrum modulation module. The pseudo code gene...

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Abstract

The invention discloses an indoor positioning system and method based on pseudolites. Three or more pseudolite base stations are arranged indoors. A barometric leveling sensor is arranged on each pseudolite base station. The three-dimensional positions of the pseudolites are accurately measured in advance through a high-precision GNSS receiving machine. The information is coded according to a certain format to form a navigation message. Spread spectrum modulation is conducted on pseudo-random codes and the navigation message, carrier modulation is then conducted on the pseudo-random codes and the navigation message, up-conversion is conducted, and then the pseudo-random codes and the navigation message are transmitted out through an antenna. The barometric leveling sensors are arranged on the pseudolite base stations. The pseudolite base stations transmit satellite navigation signals similar to signals of GNSS satellites. A temperature sensor and a gas pressure sensor are arranged on a user side, a user receiving machine receives signals sent by the pseudolite base stations, capturing, tracking, message demodulation and distance extraction are conducted, and user three-dimensional positioning is achieved according to a height restraining method through combination with barometric leveling information. Compared with a traditional pseudolite positioning method, the method is easy to achieve and high in positioning accuracy.

Description

Technical field [0001] The invention relates to the field of navigation and positioning, in particular to an indoor positioning system and method based on pseudolites. Background technique [0002] Due to some inherent constraints of the satellite navigation system itself, it has caused some insurmountable weaknesses. For example, the satellite navigation signal is very weak. When the signal passes through a wall or other obstacles, the signal becomes weaker, and it is difficult for the receiver to receive the satellite signal easily, that is, the receiver cannot complete user positioning. Pseudolites can be widely used in indoors, tunnels, underground parking lots and other occasions because of their strong signal and free deployment. However, when pseudolites are used in indoors, tunnels, underground parking lots, etc., because the layout of pseudolites is limited by space, especially in the height direction, its geometric accuracy factor is very poor, resulting in poor positi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/0257
Inventor 孙希刚纪元法孙希延符强邓洪高严素清吴孙勇王守华肖建明廖桂生
Owner GUILIN UNIV OF ELECTRONIC TECH
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