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Medium and long wave antenna simulation device for ndb and usage method

An analog device, medium and long wave technology, applied in the direction of measurement device, beacon system using radio waves, radio wave measurement system, etc., can solve the problem of inconvenience of NDB antenna and ground network

Active Publication Date: 2021-04-23
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of production debugging and teaching, it is necessary to test and verify the functions and performances of NDB transmitters, harmonic filters, antenna adapters and other equipment. However, due to factors such as size and installation site, it is inconvenient for NDB antennas to be installed in manufacturers or It is used in the teaching base, so it is necessary to design a medium and long wave antenna simulation device to replace the antenna ground grid, and complete the verification and test of NDB functional performance

Method used

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  • Medium and long wave antenna simulation device for ndb and usage method
  • Medium and long wave antenna simulation device for ndb and usage method

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] The medium-to-long-wave antenna simulation device for NDB shown in this embodiment uses technologies such as digital phase detection, numerically controlled variable inductors, variable capacitor networks, and variable tap matching transformers to jointly complete the simulation of medium-to-long-wave antennas. The medium and long wave antenna simulator device is composed of numerically controlled variable inductors, variable capacitor networks, variable tap matching transformers, servo detection components, load resistors, etc. see figure 1 shown. Among them, R s It is the internal resistance of the signal source, and it is the output impedance of the antenna adapter of the NDB system during actual use.

[0032] The numerically controlled variable inductor is used to adjust the load inductance value, including port c and port d.

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Abstract

The invention discloses a medium and long-wave antenna simulation device for NDB, which includes a numerically controlled variable inductance, a variable capacitor network, a variable tap matching transformer, a servo detection component and a load resistor, and the variable tap matching transformer is used to adjust the load The resistance value of the resistor; the variable capacitor network is used to adjust the capacitance value; the servo detection component is used to calculate the phase difference of the voltage and current at both ends of the load resistance, and adjust the inductance value of the numerically controlled variable inductor according to the phase difference. The invention can simulate the antenna within the NDB operating frequency range and meet the relevant impedance requirements, and can simulate a wide range of antenna impedance.

Description

technical field [0001] The invention relates to a radio navigation system, in particular to medium and long wave antenna simulation technology. Background technique [0002] Non-directional beacon (NDB, Non-Directional Beacon) is an all-solid-state medium and long-wave radio navigation equipment, which provides navigation signals for the airborne automatic directional machine (ADF), and can be arranged on the route (route NDB) for Aircraft navigation service can also be configured in the terminal area (terminal NDB) to provide aircraft approach and non-precision approach landing. [0003] The non-directional beacon is composed of a transmitter, a harmonic filter, a monitor, a power supply, an antenna adapter, a remote control, and an antenna ground grid. The transmitter modulates and amplifies the power of the navigation station identification code and voice information, and the harmonic filter filters out the harmonics to generate a high-power AM signal, and finally tunes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/02
CPCG01S1/028
Inventor 张俊强徐丁海
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST