Method, device and system for testing time precision of 1PPS signals and medium

Abstract

The invention discloses a method, device and system for testing time precision of 1PPS signals and a medium. The method comprises the following steps of acquiring M 1PPS signals to be tested and M reference 1PPS signals, wherein the M reference 1PPS signals are output by a reference unit through a multi-stage buffer, comparing the M 1PPS signals to be tested with the M reference 1PPS signals, and acquiring a comparison result, and according to the comparison result, obtaining the time precision of each 1PPS signal to be tested. By adopting the embodiment of the invention, a plurality of signals can be tested at one time under the condition that the test cost is reduced, the test efficiency is greatly improved, and convenience and rapidness are realized.

Description

technical field [0001] The invention belongs to the technical field of frequency calibration, and in particular relates to a method, device, system and medium for testing the time accuracy of 1PPS signals. Background technique [0002] At present, the time requirements of various terminal devices are becoming more and more accurate, and satellite timing has become an indispensable part of terminal devices in the market; after GNSS chips capture satellites to achieve 3D positioning, they can output more accurate errors relative to the world clock The second pulse of ns, the terminal device can obtain the precise time by capturing the second pulse; since the 1PPS signal output by each GNSS chip has a certain error, it is necessary to screen out the output 1PSS signal with relatively small error and small error through testing. GNSS chip; however, the 1PPS signal clock output of the GNSS chip has an error of ns level, which brings great difficulty to the screening. At present, ...

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Problems solved by technology

[0002] At present, the time requirements of various terminal devices are becoming more and more accurate, and satellite timing has become an indispensable part of terminal devices in the market; after GNSS chips capture satellites to achieve 3D positioning, they can output more accurate errors relative to the world clock The second pulse of ns, the terminal device can obtain the precise time by capturing the second pulse; since the 1PPS signal output by each GNSS chip has a certain error, it is necessary to screen out the output 1PSS signal with relatively small error and small error through testing. GNSS chip; however, the 1PPS signal clock output of the GNSS chip has an error of ns level, which brings great difficulty to the screening. At present, the most effective method is to compare the 1PPS signal with the second pulse output by the atomic clock;

[0003] However, due to the high cost of the atomic clock, the amplitude of the second pulse output by the atomic clock changes with the change of the external load impedance. For each test load, the load impedance is adjusted once. Moreover, the second pulse signal of the atomic clock and the 1PPS signal output by GNSS The method of using an oscilloscope to capture the relative error of the signal can only be applied to the R&D and debugging stage, and cannot be used for the test of the product production end;

[0004] If the atomic clock and 1PPS signal are captured by the oscilloscope at the same time, the time accuracy data of the 1PPS signal can be printed out on the host computer through the tool that comes with the oscilloscope. However, the number of channels of the oscilloscope is limited (generally only 4 channels), and a maximum of 3 terminal devices can be tested at the same time. And the test environment is complex

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