Ionospheric-reflection-based time difference of arrival positioning method for shortwave radiation source

Abstract

The invention discloses an ionospheric-reflection-based time difference of arrival positioning method for a shortwave radiation source, and belongs to the technical field of shortwave communication. The method comprises the following steps of selecting corresponding receiving sites to acquire found and monitored target signals; locally compressing the target signals, and transmitting the target signals to a master server; estimating propagation channels of the signals received by each receiving site, performing joint positioning error estimation in combination with each time difference of arrival, optimizing a positioning result according to the geographic position distribution of each receiving site and the variation amplitude of ionospheric parameters and the time differences of arrival, and giving a positioning error. According to the method, a conventional shortwave receiving antenna can be utilized, a large direction-finding antenna array is not required, the reflection influence of an ionospheric layer on shortwave sky wave signals is taken into full account, and the time differences of arrival of the signals at different receiving sites through different paths are used for positioning the shortwave radiation source; the method is disclosed according to actual needs, is particularly applied to regions where large antenna arrays cannot be erected, and is practically significant, and manpower and funds can be greatly saved.

Description

technical field [0001] The invention belongs to the technical field of short-wave communication, and in particular relates to a time-difference positioning method of a short-wave radiation source based on ionospheric reflection. Background technique [0002] With the increasing importance of national security, radio security is also showing a normalization trend in national security work. Due to the characteristics of ionospheric propagation and other characteristics of short-wave communication, its transmission distance is quite large, and it can be transmitted on a global scale, so it is easy to realize transnational communication or cause international radio interference. As the national radio management department, it should locate and approach the target short-wave signal to determine the station location of the target signal. According to the nature and harmfulness of the target signal and other factors, it is necessary to eliminate the illegal signal or the target si...

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Problems solved by technology

[0012] e. The short-wave radio positioning technology based on the direction-finding system is affected by many factors such as site selection (large area and high environmental requirements), channel calibration, and high cost. After the construction is completed, the direction-finding receiving stations are relatively fixed. Flexible assumptions, unable to flexibly complete the task of locating emission sources in different areas

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