An approach for fault detection and isolation of INS/GPS tightly-coupled system was studied,which could recognize single navigation satellite error automatically by the utilization of fault detection function,could eliminate the fault satellite and reconstruct measurements array,and could avoid the influence of the fault on system. The digital simulation environment was constructed,then simulations of method for fault detection and isolation were conducted,results of which indicated that the proposed method could detect and isolate the fault satellite in time,and could reconstruct measurements information,which ensured the accuracy and integrity of tightly-coupled system.%研究了一种基于χ2检验的惯性/卫星紧耦合系统故障检测与隔离方法，该方法可利用故障检测函数自动识别单个卫导故障，并实时剔除故障星重构观测信息序列，从而避免了对紧耦合系统的影响。构建数字化仿真环境对所研究的故障检测与隔离方法进行了仿真，仿真结果表明，该方法可在卫星发生故障时及时检测并隔离故障星，并自动实现观测信息重构，保证了紧耦合系统的精度和完好性。
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