Measurement technique of crosslink signal quality parameter for navigation satellite

Signal quality parameters represented electrical properties of the onboard equipment and have a major impact on the main task of crosslink. The traditional microwave signal quality assessment is to analyze the signal after down-converted and nonlinear distortion is introduced. To overcoming the fault of classical method, a technique using digital processing algorithm has been proposed. The crosslink signal is directly sampling by high speed sampler. Coherent receiving and demodulating are done base on soft defined technology, then the quality parameters can be analyzed such as phase consistence, phase error of IQ branch, eye pattern, correlation loss, etc. The actual signal evaluation results show that the accuracy of the proposed analytical method satisfy the crosslink signal quality parameter analysis.