An airborne 1394b bus signal transmission integrity test and evaluation method
A bus signal and integrity technology, applied in the field of airborne 1394b bus signal transmission integrity testing and evaluation, can solve problems such as complex use, impact on test results, low measurement efficiency, etc., to reduce man-hours and costs, and test equipment costs. The effect of low, large test sample size
Active Publication Date: 2021-03-26
SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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[0003] However, this measurement method requires the use of a network analyzer or real-time sampling oscilloscope, as well as a TDR probe or a differential probe
The above-mentioned instruments and equipment and supporting probes are expensive, complicated to use, and easily damaged
In addition, the clamping of the probe is unstable, which also affects the test results
In addition, the eye diagram measurement results reflect the short-term transmission quality characteristics of the wire harness. Due to the limited sampling samples, the confidence level of this evaluation method is low
Finally, these two devices are usually only able to perform single-strand measurements, and the measurement efficiency is low
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[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below ...
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The invention discloses a method for testing and evaluating signal transmission integrity of airborne 1394b bus, and belongs to the technical field of airborne bus test. The method includes the following steps that step 1, the length of patch wiring harness and a wiring harness attenuation coefficient are determined according to different model sizes and interface positions; step 2, the minimum test level of the selected patch wiring harness is theoretically calculated; step 3, the minimum test level of the patch wiring harness is actually measured; step 4, according to the length of the airborne wire harness tested, an interface form and the minimum test level of the patch wiring bus, a theoretical value of the minimum test level of the whole finished wiring harness tested is calculated;step 5, the theoretical value calculated in step 3 of the minimum test level of the finished wiring harness tested is added with 40-60mv, and a total value does not exceed a threshold value of a bus signal quality test instrument; step 6, the complete finished wiring harness is tested on board; the method can reduce working hours and expenses of rework, reduce the economic loss of the wire harness, reduce test costs, and improve the work efficiency.
Description
technical field [0001] The invention belongs to the technical field of airborne bus testing, in particular to an airborne 1394b bus signal transmission integrity testing and evaluation method. Background technique [0002] The aircraft management system of the new generation of high-performance aircraft adopts the high-speed airborne 1394b bus as the transmission means of core data and control signals. The airborne 1394b bus harness is used as the transmission carrier of data and signals, and the signal transmission quality of the bus harness affects the reliability and safety of the aircraft management system. Since the airborne 1394b bus harness is a high-frequency harness, its processing and laying process will have an impact on the signal transmission quality of the harness. In order to prove that after installation, the airborne 1394b bus wiring harness meets the design specification requirements. It is necessary to design a set of methods for measuring and quantitati...
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IPC IPC(8): G06F11/22H04L12/26
CPCG06F11/2273G06F11/2284H04L43/0823
Inventor 戴磊毕道明许翔鹏
Owner SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA