Unlock instant, AI-driven research and patent intelligence for your innovation.

A flight test method of helicopter ultrashort wave antenna pattern

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: 2019-08-02
CHINESE FLIGHT TEST ESTAB
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A flight test method of helicopter ultrashort wave antenna pattern
  • A flight test method of helicopter ultrashort wave antenna pattern
  • A flight test method of helicopter ultrashort wave antenna pattern

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a flight test method for a helicopter ultrashort wave antenna pattern. The method includes the following steps: acquisition of calibration data, flight test, and data processing; in the test flight of a certain type of helicopter antenna pattern, the flight method and data processing method are adopted. By using the distance / field strength correction algorithm described above, the "distance-field strength" calibration data obtained during the flight test is used to correct the distance of the flight test data of the current sortie, and the "distance-field strength" is solved scientifically and rigorously. Problems with time-varying relationships that are difficult to predict accurately. 66% of flight test sorties were saved, and the test flight cycle was 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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/10
Inventor 汤恒仁韩琮席龙李超张少莉
Owner CHINESE FLIGHT TEST ESTAB