Some modulation parameters, such as the carrier frequency and the symbol rate, can be estimated prior to the recognition of modulation types. Such other parameters as the modulation index, the modulation frequency deviation, and the signal broadband can be further estimated after recognition. 部分调制参数如载波频率、符号速率在识别之前获得,在识别完成之后可以进一步估计调制指数、调制频偏、信号带宽等其余参数。