Health status assessment of radar systems at aerospace launch sites by fuzzy analytic hierarchy process

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Abstract
The radar system is a fundamental part of the launch site ground equipment, and its health status is critical to the success of testing tasks and launch missions at aerospace launch sites. The health status assessment of radar systems is, however, challenging due to multiple health indicators of its components and epistemic uncertainty associated with the elicited data. In this article, a fuzzy analytic hierarchy process method, which combines the analytic hierarchy process (AHP) and fuzzy comprehensive evaluation methods, is put forth to assess the health status of radar systems at aerospace launch sites. In the first place, the four‐layer hierarchical structure, including the system, subsystem, performance indicator, and parameter index layers, of a real‐world radar system at an aerospace launch site is constructed. The AHP is, then, leveraged to identify the weights of each layer of the hierarchical structure. By eliciting the data of parameter indices as fuzzy numbers and using the fuzzy comprehensive evaluation method to calculate the layer‐by‐layer health status of the hierarchical structure, the health grade membership of the radar system is calculated. The health status of the radar system is, then, assessed in accordance to the maximum membership principle. A new importance metric is proposed to assess the influence of parameter indices on the current system's health status. The results of the importance metric can provide valuable insight for reliability enhancement and health management of the radar system.
Funding Information
  • National Natural Science Foundation of China (71922006)

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