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Helicopter ultra-short-wave antenna pattern flight test method

An antenna pattern and flight test technology, applied in the antenna radiation pattern and other directions, can solve problems such as unsatisfactory hovering performance and inapplicability

Active Publication Date: 2017-05-03
CHINESE FLIGHT TEST ESTAB
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Problems solved by technology

However, the hovering method requires the tested helicopter to hover at a height of 100 meters at a distance of 4 kilometers to 5 kilometers from the field strength test point. The reason for this is that its hovering performance cannot meet the requirements of long-term hovering at this altitude, so the hovering method is not applicable to this type of helicopter. It is necessary to propose a new flight test method suitable for the ultrashort wave antenna pattern of large helicopters

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  • Helicopter ultra-short-wave antenna pattern flight test method
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  • Helicopter ultra-short-wave antenna pattern flight test method

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Embodiment Construction

[0023] Take the ultrashort wave antenna pattern of a certain helicopter as an example to illustrate the specific implementation of this patent as follows:

[0024] The helicopter acquires calibration data and flight test data as described in this paper. The selected locations are shown in Table 1.

[0025] Including the following steps:

[0026] Step 1. Calibration data acquisition

[0027] The tested helicopter took off from the airport, climbed to a field height of 1000 meters, and flew to a distance of 30 kilometers from the field strength test point; after that, the tested helicopter flew horizontally from the first point (A) to the second point (B), and the first point The distance from the second point is 30 kilometers, and the ultrashort wave station is used to transmit the carrier at intervals during the flight. The interval is 5 seconds, and the holding time of each carrier transmission is 2 seconds. The ground field strength test point records the level after recei...

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Abstract

The invention provides a helicopter ultra-short-wave antenna pattern flight test method comprising the following steps: calibration data acquisition, flight test, and data processing. In the antenna pattern trial flight of a helicopter of one model, the flight method and the data processing method are used. A distance / field strength correction method is employed, and trial flight data of the current sortie is corrected based on 'distance-field strength' calibration data obtained in the current sortie during trial flight. Thus, the problem that the 'distance-field strength' relationship is time-varying and hard to predict accurately is solved in a scientific and rigorous way. The number of sorties is saved by 66%, and the trial flight period is shortened by more than 15 days.

Description

technical field [0001] The technical invention relates to a flight test of a helicopter communication system, belongs to the field of test flight of a communication system, and relates to a flight test method for a helicopter ultrashort wave antenna pattern. Background technique [0002] The field strength distribution diagram on each section of the spherical space surrounding the antenna is called the antenna pattern. The shape of the antenna pattern depends on the shape of the antenna and the shape and material of its mounting surface. Due to the interference between the direct wave and the reflected wave caused by the complex geometry of the aircraft, and the influence of the surface material of the aircraft body cannot be accurately calculated, it is impossible to accurately predict the antenna pattern. In the ground measurement, due to the reflection effect of the earth's surface and the influence of the accuracy of the model making, the directional pattern of the grou...

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Application Information

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IPC IPC(8): G01R29/10
Inventor 汤恒仁韩琮席龙李超张少莉
Owner CHINESE FLIGHT TEST ESTAB