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Aimed at the problems of low resolution and high data redundancy in traditional defect location functions, we proposed a cable defect location method based on Z transformation of reflection coefficient spectrum. Firstly, a reflection coefficient spectrum model of cable was established by the transmission line theory, and the feasibility of locating cable defect by the reflection coefficient spectrum was analyzed. Then, the principle of Z transformation was introduced. On the basis of reflection coefficient spectrum characteristics, the parameter values in Z transformation algorithm were determined, and a new cable defect localization function was constructed. The simulation and test results of defect location experiment show that compared with the traditional methods, the proposed cable defect location function has higher resolution and lower data redundancy, which can locate cable defect more accurately and reduce the effect of interference peaks, providing a new idea for cable defect location.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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