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Multi-sensor combined navigation time synchronizing system based on field programmable gate array (FPGA)

A time synchronization system and integrated navigation technology, applied in navigation, surveying and navigation, radio wave measurement system and other directions, can solve the problems of high cost of data acquisition cards and inapplicability to actual combined systems, etc., and achieve high time synchronization accuracy and high precision. Combined navigation, the effect of eliminating time errors

Inactive Publication Date: 2014-03-05
靳文瑞 +1
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Problems solved by technology

However, the cost of the data acquisition card is often high, and it is not suitable for the development of the actual combined system.

Method used

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  • Multi-sensor combined navigation time synchronizing system based on field programmable gate array (FPGA)
  • Multi-sensor combined navigation time synchronizing system based on field programmable gate array (FPGA)
  • Multi-sensor combined navigation time synchronizing system based on field programmable gate array (FPGA)

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0046] Such as figure 1 As shown, an FPGA-based multi-sensor integrated navigation time synchronization system is a flexible and low-cost time synchronization system (FLTS), which realizes time synchronization between IMU or other auxiliary navigation sensor measurement data and GNSS receiver data. This time synchronization system includes GNSS (Global Navigation Satellite System, global satellite navigation system) receiver 1, navigation sensor group 3, FPGA (field programmable gate array) module 6 and integrated navigation computer 8, GNSS receiver 1 has receiving antenna 2. The GN...

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Abstract

The invention relates to a multi-sensor combined navigation time synchronizing system based on a field programmable gate array (FPGA). The multi-sensor combined navigation time synchronizing system comprises a global navigation satellite system (GNSS) receiver, a navigation sensor group, an FPGA module and a combined navigation computer, wherein the GNSS receiver and the navigation sensor group are connected with the FPGA module respectively; the GNSS receiver and the FPGA module are connected with the combined navigation computer respectively; the FPGA module is used for decoding output data of the GNSS receiver to obtain receiver time, adding the receiver time, as a time tag, into measurement data of the navigation sensor group, and performing coding to obtain synchronous measurement data; the combined navigation computer is used for processing the received synchronous measurement data and the output data of the GNSS receiver, and outputting a final navigation positioning result. Compared with the prior art, the multi-sensor combined navigation time synchronizing system has the advantages that time errors of measurement data of navigation sensors can be effectively eliminated, and high-accuracy combined navigation in a high-speed environment is realized.

Description

technical field [0001] The invention relates to a multi-sensor integrated navigation time synchronization technology in the field of navigation equipment, in particular to an FPGA-based multi-sensor integrated navigation time synchronization system. Background technique [0002] Time synchronization of multi-sensor measurement data has always been a very challenging problem in the design process of GNSS / INS or multi-sensor integrated navigation system. In comparison, the measurement element IMU in inertial navigation (INS) does not have a specific time reference. Even the digital IMU output only has continuous sampling interval marks, but no absolute time scale. The IMU data enters the navigation computer through the data transmission interface of the navigation computer. At present, the most common serial interfaces such as RS232 / RS422 are still used. The delay of the interface hardware or the non-real-time operating system adopted by the navigation computer will cause the...

Claims

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Application Information

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IPC IPC(8): G01S19/49G01C21/00G01C21/16
CPCG01C21/165G01S19/47
Inventor 靳文瑞王立端
Owner 靳文瑞
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