Patent ID: 11876811
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 2:
3. A detection system comprising:
a sensor; and
a controller which includes:
state estimation circuitry configured to calculate, using sensor data indicating a state of a control target outputted from the sensor and a control input to control the state of the control target, an estimate of the state of the control target;
calculation circuitry configured to calculate the control input to which colored noise in a predetermined frequency band is added, according to the estimate of the state of the control target which has been calculated; and
detection circuitry configured to detect an attack using outputs from the state estimation circuitry and the calculation circuitry when a difference between the estimate of the state of the control target and an output of the calculation circuitry exceeds a predetermined threshold.