ionospheric cross modulation

例句：

1. 1. The technique of ionospheric cross modulation is used to study the propagation of radio waves in the ionosphere.
   电离层交叉调制技术被用来研究无线电波在电离层中的传播。
2. 2. In ionospheric cross modulation, the signals are transmitted through a series of layers in the ionosphere.
   在电离层交叉调制中，信号通过一系列电离层中的层进行传输。
3. 3. The ionospheric cross modulation technique has been widely used in communication systems to improve signal quality andreliability.
   电离层交叉调制技术已被广泛应用于通信系统中，以提高信号质量和可靠性。