Dead reckoning-based low-cost Big Dipper and MEMS tight-coupling positioning system and method

A dead reckoning and positioning system technology, applied in satellite radio beacon positioning systems, radio wave measurement systems, measurement devices, etc., can solve the problems of high dependence on search algorithms and large time costs

Inactive Publication Date: 2016-06-08
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In various studies aimed at improving the factor of signal difference, the existing methods focus on using a certain search algorithm to search for a combined solution that makes the objective function related to signal difference reach the maximum or minimum value. The main drawback is the high dependence on the search algorithm and the large time overhead

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  • Dead reckoning-based low-cost Big Dipper and MEMS tight-coupling positioning system and method
  • Dead reckoning-based low-cost Big Dipper and MEMS tight-coupling positioning system and method
  • Dead reckoning-based low-cost Big Dipper and MEMS tight-coupling positioning system and method

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Embodiment Construction

[0085] The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:

[0086] Such as figure 1 A low-cost Beidou and MEMS tightly coupled positioning system based on dead reckoning is shown, including Beidou receiver module 2, MEMS sensor module 1, Beidou and MEMS fusion algorithm module 4 and ARM-Linux embedded system module 3. The ARM-Linux embedded system module 3 is respectively connected with the Beidou receiver module 2, the MEMS sensor module 1, and the Beidou and MEMS fusion algorithm module 4.

[0087] The Beidou receiver module is used to capture and track satellite signals, and output pseudorange, pseudorange rate and satellite ephemeris information.

[0088] The MEMS sensor module includes a processor, and a three-axis accelerometer, a three-axis gyroscope, and a three-axis magnetometer respectively connected to the processor. The axis sensor information is used to estimate the heading angle and speed informa...

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Abstract

The invention discloses a dead reckoning-based low-cost Big Dipper and MEMS tight-coupling positioning system and method. Based on the acceleration, the magnetometer and the angular velocity information of an MEMS, the PDR algorithm is implemented. The acquired PDR position and velocity information is combined with the Ephemeris information of a Big Dipper receiver, and then the pseudo range and the pseudo-range rate value of a PDR terminal can be estimated. After that, the above pseudo range and the above pseudo-range rate value are compared with the pseudo range and the pseudo-range rate value that are outputted by the Big Dipper receiver, and the difference values therebetween are adopted as the observed values of a navigation filter. The optimal estimation on the error amount of a combination system is conducted by the filter, and then error-corrected data are obtained. According to the technical scheme of the invention, in an environment wherein a target is moved in such a manner that the signal of the target is decreased significantly or the target has no satellite signal, the target can still be continuously positioned. The invention also provides a federal kalman filter algorithm. The time accumulative error of a traditional inertial navigation system is inhibited, and the stability of the overall system is improved. At the same time, based on the adaptive adjustment algorithm, the soft handoff of the system can be realized in different environments, so that the seamless transition of the positioning effect is realized.

Description

technical field [0001] The invention relates to the technical fields of signal processing technology, data fusion technology, wireless positioning and sensor positioning, and in particular to a low-cost Beidou and MEMS tightly coupled positioning system and method based on dead reckoning. Background technique [0002] With the increasingly widespread application of mobile devices and the popularity of wireless networks, users have increasingly strong demands for immediacy and locality of information, so location-based services have also attracted much attention. Currently more popular wireless positioning systems include Global Positioning System (GPS), Cellular Positioning System, Bluetooth Positioning System, Radio Frequency Identification (RFID) Positioning System, ZigBee Positioning System and WLAN Positioning System. Among them, the GPS positioning system is currently the most widely used, and the outdoor positioning accuracy is high. However, in the sheltered or indoor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/47
CPCG01S19/47
Inventor 田增山李泽吴自鹏金悦周牧张振源林天瑜王阳金潇潇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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