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PXI/PCI bus-based remote synchronization device of test signal source devices and method thereof

A PCI bus and test signal source technology, which is applied in the field of remote synchronization equipment between test signal source equipment, can solve problems such as large clock pulse distortion, discounted output signal accuracy, and reduced number of samples

Active Publication Date: 2015-06-24
SHANGHAI SATELLITE ENG INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For long-distance synchronization, since the frequency of the clock signal is generally above MHz, the distortion of the clock pulse is very large after the long-distance transmission, so that the remote device cannot use the clock signal as its external clock signal, and the synchronization cannot be achieved.
If the frequency of the clock pulse signal on the long-line is reduced, even if the signal can be transmitted to the remote signal source device well, the sampling number of the output signal of the remote signal source device will inevitably decrease due to the reduction of the clock frequency, and the accuracy of the output signal will be greatly reduced. discount

Method used

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  • PXI/PCI bus-based remote synchronization device of test signal source devices and method thereof
  • PXI/PCI bus-based remote synchronization device of test signal source devices and method thereof
  • PXI/PCI bus-based remote synchronization device of test signal source devices and method thereof

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Experimental program
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Effect test

Embodiment 1

[0046] This embodiment provides a remote synchronization device between test signal source devices based on the PXI / PCI bus, including a near-end signal source device and a far-end signal source device for synchronization, and the near-end signal source device and the far-end signal source device The source devices are connected by signals; both the near-end signal source device and the far-end signal source device are virtual instruments in the form of standard PXI / PCI bus interfaces; both the near-end signal source device and the far-end signal source device are equipped with local Standard PXI or PCI bus interface analog output card for signal output; the analog output card of the remote signal source device is equipped with a counter module for generating high-frequency sampling pulses or is equipped with a general-purpose counter card.

[0047] In this embodiment, the counter module is an analog output card board-mounted general-purpose counter or a counter card configured...

Embodiment 2

[0050] The present embodiment is to utilize the synchronization method of the remote synchronization device between the test signal source equipment based on the PXI / PCI bus that embodiment 1 provides, comprising the following steps:

[0051] The first step is to select the appropriate type of synchronous signal transmission line according to the distance between the near-end signal source device and the far-end signal source device and the electromagnetic environment around the synchronous transmission line;

[0052] In the second step, the near-end signal source device calls the analog output card driver of the PXI / PCI interface through programming to control its output of the signal required by the near-end signal source, and at the same time outputs a low-frequency synchronous pulse signal that is an integer multiple of the frequency of the near-end output signal ;

[0053] In the third step, the remote signal source device uses the synchronous signal transmitted by the lo...

Embodiment 1

[0072] Above-mentioned embodiment 1 and embodiment 2 are specifically:

[0073] Embodiment 1 required hardware equipment and software are as follows:

[0074]

[0075] Correctly install and configure each device and software according to its instructions, and the self-test of the analog output card is completed.

[0076] In Embodiment 2, when carrying out the program design of "near-end signal source equipment", the configuration parameters required in the program can be determined according to the following steps, and the process is as follows:

[0077] Determine the upper limit of the number of sampling points of the near-end signal source device according to the maximum sampling rate index of the analog output card and the highest frequency of the signal to be generated. The calculation method for the maximum number of data points is as follows:

[0078] n max = S max ...

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Abstract

The invention discloses a PXI / PCI bus-based remote synchronization device of test signal source devices and a method thereof. The method comprises the steps as follows: a transmission line with the right type is selected according to the distance between two test devices and the surrounding environment; a proximal signal source device controls a PXI / PCI interface to output a required signal via invoking the simulative output card driving program, and meanwhile outputs a synchronization plus signal; a remote signal source device generates a high-frequency sampling plus signal via a counter on a simulative output card and is equipped with the accouter to work in a plus generation mode via a simulative output card driving program, and a trigger source is a synchronization signal transmitted from a long line; and a synchronization signal transmitted by the proximal signal source device triggers the plus output of the accouter module one time in each period, therefore the proximal source device synchronizes with the remote signal source device one time in each period, and the remote synchronization of test signal source device is achieved. The invention has the advantages of reliability and maturity, the phases of the signals output from the devices are synchronized, and phase error of the signals completely meets satellite test system indexes.

Description

technical field [0001] The invention relates to a method for remote synchronization between devices, in particular to a device and method for remote synchronization between test signal source devices based on a PXI / PCI bus. Background technique [0002] During the satellite-to-earth large-circuit imaging test process of the spinning meteorological satellite, when the on-board scanning synchronizer is set to the "ground" signal as the scanning control timing reference, the cloud image reference source equipment that simulates the original cloud image on the ground is required to send to the satellite. Strict phase synchronization is maintained between the ladder wave signal and the earth wave signal output by the attitude control station equipment to ensure a constant phase difference. This is mainly due to the fact that the staircase wave signal in each signal period represents the data of each scanning line of 2500 lines constituting a cloud image, and only the staircase wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04L7/00
Inventor 梁永红
Owner SHANGHAI SATELLITE ENG INST