The HF Channel EM Parameters Estimation Under a Complex Environment Using the Modified IRI and IGRF Model

The international reference ionosphere (IRI) model is a generally accepted standard ionosphere model. It describes the ionosphere environment in quiet state and predicts the ionosphere parameters within a certain precision. In this communication, we have made a breakthrough in the application of the IRI model by modifying the model for Chinese region. Construct the ionosphere parameters foF2 and M(3000)F2 by using the Chinese Reference Ionosphere (CRI) coefficients, appropriately increase hmE, hmF2 height, reduce the thickness of F layer, validate the parameter by the measured values and solve the electron concentration distribution with QPS (quasi-parabolic segments). In this communication, 3D ray tracing algorithm was constructed based on the modified IRI model and IGRF geomagnetic field model. In short-wave detection, it can be used to predict the electromagnetic parameters of the receiving point, such as, the receiving area, maximum available frequency and the distribution of the group delay etc., which can help to determine the suitability of the communication. As an example, we estimated the short wave EM parameters around Qingdao in the detection from Zhengzhou to Qingdao using the modified IRI and IGRF model and provided technical support for the communication between the two cities.