Abstract
The problem of low accuracy of off-line detecting on thermal test low-frequency cable faults could be solved by designing a cable fault detection system, based on FPGA program export M sequence code (linear feedback shift register sequence) as pulsed signal source. This paper discussed the design principle of spread spectrum time-domain reflectometry (SSTDR) reflection method, and introduced the hardware structure. Experimental platform established by this detection system could adapt to measurement of thermal test low-frequency cable with different lengths and could meet different additive noise environment. The off-line detecting on thermal test low-frequency cable faults could be solved by passing pre-filtering circuit and wave-shaping circuit processing, calculating transmitting and receiving pulse in transmit-receive buffer circuit, cable fault points could be located accurately through FPGA digital correlation algorithm. Testing data has shown that, in the M-sequence based SSTDR detection system, the additive noise and detected confidence can be described as a linear relationship.
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