Data acquisition time synchronization system and method

A time synchronization system and time synchronization technology, applied in the field of mobile surveying and mapping, can solve problems such as time synchronization point cloud distortion, invalid data acquisition, GPS data combination failure, etc., to achieve the effect of enhancing stability and ensuring accuracy

Inactive Publication Date: 2020-04-14
WUHAN HI TARGET DIGITAL CLOUD TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the data time is not handled properly, the data acquisition is invalid or the error is too large
Wherein, the error on the time synchronization will cause the point cloud collected by the laser scanner to be distorted, tilted, and deformed; the combination of the inertial data collected by the inertial module and the GPS data collected by the Global Positioning System (Global Positioning System, GPS) module will fail; It will also cause the images collected by the panoramic camera to be unable to be registered with the point cloud, and it is impossible to accurately perform panoramic measurement and other work
In short, the expected measurement effect cannot be achieved

Method used

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  • Data acquisition time synchronization system and method

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no. 1 example

[0065] An embodiment of the present invention provides a data collection time synchronization system 100 to realize time synchronization of multiple sensor data. see figure 1 , is a block diagram of the circuit structure of the data acquisition time synchronization system 100 provided by the present invention. The data collection time synchronization system 100 includes a GNSS receiver 120, a time synchronization controller 110 and multiple data collection modules 130, and the GNSS receiver 120, the time synchronization controller 110 and multiple data collection modules 130 are connected in sequence.

[0066] see figure 2 , is a further circuit structure block diagram of the data acquisition time synchronization system 100 provided by the present invention. The data collection module 130 may be an inertial measurement unit 131 (Inertial Measurement Unit, IMU), a camera 133 , an encoder 132 , a scanner 134 and so on.

[0067] Wherein, the GNSS receiver 120 can acquire the ...

no. 2 example

[0094] The present invention also provides a data collection time synchronization method, which is applied to the time synchronization controller 110 of the above data collection time synchronization system 100 . see Image 6 , is a flow chart of the data acquisition time synchronization method provided by the present invention. The data acquisition time synchronization method includes:

[0095] S601. When receiving the GPS signal and the GPS second pulse signal transmitted by the GNSS receiver 120, use the GPS second pulse signal as a time synchronization reference to synchronize the GPS time contained in the GPS signal to the system time of the data acquisition time synchronization system 100.

[0096] Specifically, when receiving the GPS signal and the GPS second pulse signal transmitted by the GNSS receiver 120, the received GPS second pulse signal is counted to obtain the count value; when the count value is the first threshold, the data acquisition time synchronization ...

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Abstract

The embodiment of the invention provides a data acquisition time synchronization system and method, and relates to the technical field of mobile surveying and mapping. The method comprises the following steps: synchronizing GPS time contained in a GPS signal to system time of a data acquisition time synchronization system by taking a GPS pulse per second signal as a time synchronization referencewhen the GPS signal and the GPS pulse per second signal transmitted by a GNSS receiver are received; when the GPS signal and the GPS pulse per second signal transmitted by the GNSS receiver are not received, generating an internal pulse per second signal, and updating the preset initial time by taking the internal pulse per second signal as a reference to obtain the system time of the data acquisition time synchronization system, and further controlling data acquisition time of data acquisition modules to be synchronous, and obtaining the synchronous navigation data. No matter whether the GPSsignal exists or not, the system time can be updated according to the pulse per second signal, the accuracy of the system time is guaranteed, it is guaranteed that accurate time and position information can be obtained, and the stability of the system is enhanced.

Description

technical field [0001] The present invention relates to the technical field of mobile surveying and mapping, in particular to a data acquisition time synchronization system and method. Background technique [0002] Mobile measurement is widely used in the field of surveying and mapping, and it is the mainstream of development in the field of road electronic map measurement and three-dimensional measurement and modeling in the future. A complete mobile measurement system should include a laser scanner, a panoramic camera, a GNSS (Global Navigation Satellite System, Global Navigation Satellite System) module, an inertial module, an odometer, a time synchronization controller, and a data acquisition and storage device. The design of the time synchronization controller directly affects the calculation accuracy of the measured data, especially in the field of precise mobile surveying and mapping, the design of a high-accuracy time synchronization control system is particularly im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/47G01C21/16
CPCG01C21/165G01S19/47
Inventor 杨柳杨晶李毕前
Owner WUHAN HI TARGET DIGITAL CLOUD TECH CO LTD
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