Geographic Information Simulation for HF Communication Channels
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Solution Overview
Problem
Current simulation test systems for medium-high frequency communication channels fail to accurately simulate the complex and random characteristics of medium and high frequency transmission channels, particularly neglecting geographical location, ionospheric variations, and environmental noise, leading to high testing costs and inefficiencies.
Innovation Solution
A geographic information-based simulation test system that calculates and simulates ground wave and sky wave transmission paths, incorporating digital maps for geographic features and noise generation, using a human-machine interface to input parameters and control the simulation process, and synthesizing signals to mimic real-world conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long-distance communication test system is built in the real environment, then the communication performance can be tested, but the test cost and time consumption increase significantly
Solution Approach 1:
The patent creates a virtual copy of the real-world communication channel by using geographic information data (digital maps, terrain information, ionospheric parameters) to simulate the channel characteristics in a laboratory environment. This virtual channel model replicates the complex propagation paths, attenuation, and noise conditions without requiring actual long-distance physical testing.
Solution Approach 2:
The system dynamically adjusts simulation parameters such as frequency, geographic coordinates, time range, and environmental conditions to match various real-world scenarios. By changing these parameters, the system can simulate different transmission conditions (ground wave, sky wave, ionospheric variations) without physically relocating test equipment.
2Measurement precision
If real environment testing is conducted for medium-high frequency communication, then accurate channel characteristics can be obtained, but the complexity and resource requirements increase
Solution Approach 1:
The patent introduces geographic information data and simulation software as intermediary elements between the test equipment and the real communication channel. These intermediaries process and interpret complex geographic and environmental data to generate simplified channel models, making the testing process more manageable while maintaining accuracy.
Solution Approach 2:
The system replaces physical mechanical testing arrangements with computational simulations. Instead of building actual long-distance communication paths and physically measuring channel characteristics, the patent uses computer-based simulation to calculate and model these characteristics based on geographic information and propagation theory.
3Adaptability or versatility
If existing wireless channel simulators are used, then some channel characteristics can be simulated, but they fail to consider geographical location, ionosphere, and environmental noise
Solution Approach 1:
The patent designs a comprehensive simulation system that can handle multiple propagation modes (ground wave, sky wave), various geographic conditions (urban, rural, marine), different times of day, and seasonal variations all within a single unified platform. This multi-functional approach allows the system to adapt to any communication scenario without requiring separate specialized simulators.
Solution Approach 2:
The system adds new dimensions to channel simulation by incorporating geographic location data (latitude, longitude, elevation), temporal variations (time of day, season), and environmental factors (ionospheric conditions, terrain morphology). These additional dimensions enable the simulation to capture the full complexity of real-world medium-high frequency communication channels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system significantly reduces testing costs and speeds up the evaluation of medium-high frequency communication systems by accurately simulating signals received at different geographic locations and time periods, improving the testing efficiency of medium-high frequency communication equipment.
Implementation Method 1
Medium frequency (also known as medium wave, MF) communication is mainly transmitted by ground wave
Implementation Method 2
high frequency (also known as short wave, HF) communication is transmitted by sky wave and ground wave, that is, after the reflection of the ionosphere
Implementation Method 3
The transmission mode of medium-high frequency communication system includes sky wave and ground wave
Data Source
AI summary
The present invention discloses a geographic information-based simulation test system for medium-high frequency communication channels, comprising a human-machine interface module, a geographic information processor, a ground wave signal simulation processing module, a sky wave signal simulation processing module, a digital map, an ambient noise generation module, a time generator, and an simulation signal synthesizer. A ground wave transmission signal and a sky wave transmission signal are respectively simulated according to a ground wave transmission path and a sky wave transmission path; and finally, the ground wave simulation signal, the sky wave simulation signal, and the ambient noise signal are synthesized and sent to a medium-high frequency receiver. By means of the geographic information-based simulation test system for medium-high frequency communication channels, the test cost of the medium-high frequency communication system and device can be reduced, the signals that may be actually received by the medium-high frequency receiver at any location in any period of a year can be simulated quickly, thereby greatly increasing the test speed of the medium-high frequency communication system and device.