CN201017029Y

CN201017029Y - Dynamic signal synchronous collecting device based on GPS

Info

Publication number: CN201017029Y
Application number: CNU200720067697XU
Authority: CN
Inventors: 彭泓; 金玮
Original assignee: Shanghai VI Service Network Co Ltd
Current assignee: Shanghai VI Service Network Co Ltd
Priority date: 2007-03-08
Filing date: 2007-03-08
Publication date: 2008-02-06
Anticipated expiration: 2017-03-08

Abstract

The utility model belongs to the dynamic signal synchronous acquisition technical field and in detail relates to a GPS-based dynamic signal synchronous acquisition device. The device consists of a GPS receiver and a data acquisition unit. The data acquisition unit consists of a PXI box, a PXI controller, a PXI clock synchronous module, a PXI counting module and a PXI dynamic signal acquisition module. An absolute time output of the GPS receiver is connected with a serial input end of the PXI controller via a serial cable. A 10M clock output end of the GPS receiver is connected with a clock input end of a PXI clock connection synchronous module via the same axis. A PPS second impulse output end of the GPS receiver is connected with a counting input end of the PXI counting module via the same axis. Each signal input end of the PXI dynamic signal acquisition module is connected with each dynamic signal acquired by the device via the same axis. The utility model is provide with the appropriate structure, the advanced technology and the high synchronization precision, and can be easily expanded. The utility model is applicable for high-precision multi-device synchronous acquisition of dynamic signals, which are of a large number and are widely distributed.

Description

Dynamic Signal synchronous acquisition device based on GPS

Technical field

The utility model belongs to the synchronous acquisition technical field of Dynamic Signal, is specifically related to a kind of Dynamic Signal synchronous acquisition device based on GPS.

Background technology

When large structure (as bridge) is carried out health or status monitoring, often need the vibration signal of its each key point is carried out accurate synchronous acquisition, so that recover the mode of structure.The Dynamic Signal number of Cai Jiing is not a lot of if desired, and between spacing when not being very big (less than 100 meters), use single data collector to meet the demands with reference instrument bus (as PXI).By triggering and the synchronizing function that provides on the instrument bus, can finish the synchronous working between each data acquisition module in the system easily, make that each acquisition channel on each data acquisition module can carry out accurate synchronous acquisition to each Dynamic Signal.

For large structure, often the vibration signal number on it is more, and it is very wide again to distribute, and the precise synchronization of using single data collector with reference instrument bus can not satisfy these Dynamic Signals is gathered requirement.Must dispose a plurality of data collectors with reference instrument bus, and the precise synchronization collection mechanism between the introducing device, just can meet the demands.

Summary of the invention

The purpose of this utility model be to propose a kind of rational in infrastructure, be easy to expand, advanced technology, Dynamic Signal synchronous acquisition device that synchronization accuracy is high based on GPS.

The Dynamic Signal synchronous acquisition device that the utility model proposes based on GPS, form by GPS receiver 1 and data acquisition unit 14, its structure as shown in Figure 1, wherein, data acquisition unit 14 is made up of PXI cabinet 2, PXI controller 3, PXI clock synchronization module 4, PXI counting module 5 and PXI dynamic signal acquisition module 6; GPS receiver 1 possesses three kinds of characteristic signal outputs, the absolute time output terminal 11 of GPS receiver 1 connects the serial ports input end of PXI controller 3 by Serial Port Line 7, the 10M output terminal of clock 12 of GPS receiver 1 is by the input end of clock of coaxial cable 8 connection PXI clock synchronization modules 4, and the PPS pulse per second (PPS) output terminal 13 of GPS receiver 1 connects the counting input end of PXI counting modules 5 by coaxial cable 9.

In the utility model, each signal input part of PXI dynamic signal acquisition module 6 connects each Dynamic Signal 15 of gathering by coaxial cable 10.

In the utility model, PXI dynamic signal acquisition module 6 is the 1-12 piece.

When using single or multiple the utility model to carry out the synchronous acquisition of Dynamic Signal, need host computer of configuration, and the PXI controller 3 of each utility model is coupled together by Ethernet with host computer.Host computer is finished the startup of each utility model synchronous acquisition task and the setting of relevant information by the upper program of synchronous acquisition, and the signal data that collects is shown in real time.

In the utility model, PXI controller 3 is provided with storer, can carry out storage backup to the signal data that collects.

In the utility model, PXI controller 3 provides ftp server, and host computer can be downloaded the stored signal data file from the storer of corresponding PXI controller 3 by File Transfer Protocol, does further signal off-line analysis.

In the utility model, GPS receiver 1 can adopt existing commercially available prod, requires it at spacious zone energy quick lock in satellite and synchronous with its maintenance, has the output of absolute time signal, the output of PPS pps pulse per second signal and the output of 10M clock signal.

In the utility model, data acquisition unit 14 should place GPS receiver 1 near, signal connects between finishing Serial Port Line 7, coaxial cable 8 and coaxial cable 9 should be no more than 10 meters.The coaxial cable 10 that connects each signal input part of each Dynamic Signal 15 and PXI dynamic signal acquisition module 6 should be no more than 100 meters.

Synchronization mechanism of the present utility model is based on synchronizing signal and the triggering on the data acquisition unit 14PXI bus and the synchronizing function realization of 1 output of GPS receiver, be that data acquisition unit 14 carries out synchronously with reference to the synchronizing signal of GPS, and synchronizing signal is incorporated into each PXI dynamic signal acquisition module 6 on it, thereby instruct each acquisition channel of each acquisition module that each Dynamic Signal that connects is carried out accurate synchronous acquisition by the triggering on the PXI bus and synchronizing function.Like this, a plurality of Dynamic Signal synchronous acquisition devices just can carry out synchronously with the synchronizing signal of GPS independently of one another, thereby quantity each Dynamic Signal more, distributed more widely is carried out high-precision many device synchronous acquisition.

The course of work of the present utility model is as follows:

1, finishes GPS receiver 1 and be connected, finish each Dynamic Signal and be connected with the signal of each acquisition channel of each PXI dynamic signal acquisition module 6 of data acquisition unit 14 with synchronizing signal between the data acquisition unit 14.The absolute time output terminal 11 of GPS receiver 1 connects the serial ports input end of PXI controller 3 by Serial Port Line 7, the 10M output terminal of clock 12 of GPS receiver 1 is by the input end of clock of coaxial cable 8 connection PXI clock synchronization modules 4, and the PPS pulse per second (PPS) output terminal 13 of GPS receiver 1 connects the counting input end of PXI counting modules 5 by coaxial cable 9; Each signal input part of PXI dynamic signal acquisition module 6 connects each Dynamic Signal 15 that this device is gathered by coaxial cable 10.

2, start GPS receiver 1, wait for GPS receiver 1 locking satellite and synchronous with its maintenance;

3, the log-on data collecting unit 14;

4, when the collaborative synchronous acquisition work of finishing Dynamic Signal of a plurality of Dynamic Signal synchronous acquisition devices, after the operations of each device being finished above the 1st, 2,3 steps, the beginning subsequent operation;

5, each synchronous acquisition device is connected by Ethernet with host computer, starts host computer;

6, the upper program of operation synchronous acquisition on host computer is specified the configuration information of each synchronous acquisition device acquisition channel and the time of commencing signal acquisition tasks, sends the signals collecting initiation command;

7, in the time of need stopping the signals collecting task of each synchronous acquisition device, send signals collecting in the upper program of synchronous acquisition, for each synchronous acquisition device and cease and desist order.

The utility model is rational in infrastructure, be easy to expansion, advanced technology, synchronization accuracy height, is applicable to quantity each Dynamic Signal more, distributed more widely is carried out high-precision many device synchronous acquisition.

Description of drawings

Fig. 1 is a structural diagrams of the present utility model.

Number in the figure: 1 is the GPS receiver, and 2 is the PXI cabinet, and 3 is the PXI controller, 4 is the PXI clock synchronization module, 5 is the PXI counting module, and 6 is PXI dynamic signal acquisition module, and 7 is Serial Port Line, 8,9,10 be respectively coaxial cable, 11 is the absolute time output terminal of

GPS receiver

1, and 12 is the 10M output terminal of clock of

GPS receiver

1, and 13 is the PPS pulse per second (PPS) output terminal of

GPS receiver

1,14 is data acquisition unit, and 15 is each Dynamic Signal.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing by embodiment.

Embodiment 1, gathers content: 100 road vibration signals that are distributed in each section of cable-stayed bridge steel case beam

Acquisition mode: precise synchronization collection

Sample frequency: 100Hz

The utility model quantity of configuration: 4

100 road vibration signals that need carry out the precise synchronization collection are distributed in each section of cable-stayed bridge with disperseing, by distance is far and near they are divided in four different zones, and dispose four utility models respectively and come the interior vibration signal of pickup area.

For each device, GPS receiver 1 adopts existing commercially available prod, PXI cabinet 2 adopts NI PXI-1042, PXI controller 3 adopts NI PXI-8196 RT, PXI clock synchronization module 4 adopts NI PXI-6652, PXI counting module 5 adopts NI PXI-6624, and PXI dynamic signal acquisition module 6 adopts NI PXI-4472B.NI PXI-4472B is 24 a dynamic signal acquisition card, and 8 passage synchronous acquisition have the dynamic range of 120dB.

Above-mentioned each parts are installed by mode shown in Figure 1 and be connected, the person skilled in art all can smooth implementation.After finishing each utility model internal signal connection, each vibration signal is connected to each Dynamic Signal input end of the utility model of affiliated area respectively, each utility model is connected by Ethernet with host computer.

By the upper program of the synchronous acquisition of host computer, specify the configuration information of each utility model acquisition channel and the time of commencing signal acquisition tasks, send the signals collecting initiation command, 100 road vibration signals that are distributed in each section of cable-stayed bridge steel case beam are at the appointed time begun the precise synchronization collection.

When using the utility model that above 100 road vibration signals are carried out synchronous acquisition, between the acquisition channel of different utility models maximum synchronous error 4 delicate in.

Claims

1. Dynamic Signal synchronous acquisition device based on GPS, form by GPS receiver (1) and data acquisition unit (14), it is characterized in that data acquisition unit (14) is made up of PXI cabinet (2), PXI controller (3), PXI clock synchronization module (4), PXI counting module (5) and PXI dynamic signal acquisition module (6); The absolute time output terminal (11) of GPS receiver (1) connects the serial ports input end of PXI controller (3) by Serial Port Line (7), the 10M output terminal of clock (12) of GPS receiver (1) is by the input end of clock of coaxial cable (8) connection PXI clock synchronization module (4), and the PPS pulse per second (PPS) output terminal (13) of GPS receiver (1) connects the counting input end of PXI counting module (5) by coaxial cable (9).

2. the Dynamic Signal synchronous acquisition device based on GPS according to claim 1 is characterized in that each signal input part of PXI dynamic signal acquisition module (6) connects each Dynamic Signal (15) of gathering by coaxial cable (10).

3. the Dynamic Signal synchronous acquisition device based on GPS according to claim 1 is characterized in that PXI dynamic signal acquisition module (6) is the 1-12 piece.

4. the Dynamic Signal synchronous acquisition device based on GPS according to claim 1 is characterized in that PXI controller (3) is connected by Ethernet with host computer.

5. the Dynamic Signal synchronous acquisition device based on GPS according to claim 1 is characterized in that PXI controller (3) is provided with storer.

6. the Dynamic Signal synchronous acquisition device based on GPS according to claim 5 is characterized in that the storer on the PXI controller (3) connects host computer by File Transfer Protocol.