Device and calculation method for predicting maximum usable frequency (MUF) of short-wave communication

A technology of maximum available frequency, short-wave communication, applied in the direction of measurement device, sound wave re-radiation, utilization of re-radiation, etc. difficult to do etc.
CN101719802AInactive Publication Date: 2010-06-02BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2010-06-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a device for predicting the maximum usable frequency (MUF) of a short-wave communication, comprising a user input module, an environmental model module, a space distribution module for establishing a refractive index according to a magnetoionic theory, a ray tracking characteristic calculation module and a predicated maximum usable frequency expansion module; the calculation method for predicting the maximum usable frequency of the short-wave communication comprises the seven steps of: 1. confirming an initial value of a ray equation; 2. establishing electronic concentration distribution by utilizing international feference ionosphere (IRI); 3. introducing a geomagnetic field model of International geomagnetic reference field (IGRF) and establishing a function relation; 4. solving a differential equation; 5. extracting ray parameters that reach the ground; 6. screening ray tracking results; and 7. selecting 85 percent of MUF as the frequency used by the short-wave communication. The invention solves the method for acquiring form parameters of the ionized layer model and establishes the electronic concentration distribution over the position according to longitudes and latitudes at any time and place. The invention has wide practical value and application prospects in the technical field of short-wave communications.
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Description

(1) Technical field

[0001] The invention relates to a device and a calculation method for predicting the maximum available frequency of short-wave communication based on ray tracing technology, and belongs to the technical field of short-wave communication. (2) Background technology

[0002] In the application of short-wave communication, for the ionosphere with a certain electron density distribution and a certain receiving and transmitting distance, the electric wave that can be reflected back to the ground has a maximum frequency, called the highest usable frequency (MUF), which varies with the distance between the transmitting and receiving. decrease and become lower. If the distance between receiving and sending is constant and the transmitting frequency is low, the receiving point can receive high and low angle waves with a certain time delay difference; as the frequency becomes higher, the time delay difference between high and low angle waves decreases until it gradu...

Claims

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