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Large antenna directional pattern measuring method based on correlation method

A technology of antenna pattern and measurement method, applied in directions such as antenna radiation pattern, to achieve the effect of simple test process, low site requirements, and wide measurement range

Active Publication Date: 2015-04-15
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention has the advantages of low site requirements, simple test process, small workload, and little influence by channel changes.

Method used

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  • Large antenna directional pattern measuring method based on correlation method
  • Large antenna directional pattern measuring method based on correlation method
  • Large antenna directional pattern measuring method based on correlation method

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Embodiment Construction

[0065] Since the antenna to be tested can be rotated, the static source is selected as the observation source, such as a geostationary orbit satellite. In this case, it is satisfied that the antenna under test moves relative to the observation source in a scanning manner; the auxiliary antenna is always pointed at the observation source and is relatively static, and this measurement method is called a scanning measurement method. In this method, the antenna to be tested scans and measures within the range to be tested, obtains the observation data of the antenna to be tested and the auxiliary antenna, and performs calculations such as cross-correlation and autocorrelation to obtain the pattern of the antenna to be tested.

[0066] During the measurement, the antenna under test rotates continuously, and the rotational angular velocity is ω; within the time of rotation Δt, the angle change is Δt ω; when Δt is extremely small, Δt ω is also very small, and it can be approximated as...

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Abstract

The invention discloses a large antenna directional diagram measuring method based on a correlation method, particularly for a rotatable large single antenna such as a radio parabolic telescope. By utilizing a correlation operation mode and an auxiliary antenna, a reasonable receiving manner is designed for measuring the directional diagram of an antenna to be measured, and the antenna directional diagram with high precision and wide angle range is obtained by utilizing the correction between the receiving signal of the antenna to be measured and the receiving signal of the auxiliary antenna. Appropriate measured parameters can be selected according to actual measurement conditions, so that the purposes of reducing the cost as much as possible, facilitating the measurement, improving the measurement accuracy and widening the measurement range are reached under the condition that the normal use of the antenna is not influenced. Directional diagram measurement is carried out on a large antenna rotatable in an external field, on one hand, the complicated measuring processes are eliminated, and on the other hand, the directional diagram of the antenna to be measured can be quickly measured under the condition of guaranteeing the measurement accuracy.

Description

technical field [0001] The invention relates to a method for measuring an antenna pattern, in particular to a method for measuring a large antenna pattern based on a correlation method. Background technique [0002] Since the 20th century, radar, communication, astronomical observation and other fields have developed rapidly, and antennas have become important basic equipment in these fields. Therefore, the measurement of various parameters of antennas has attracted much attention. Antenna pattern is the most important and basic antenna parameter, which characterizes the distribution of antenna radiation energy in space. By measuring the antenna pattern, important antenna parameters such as the antenna's directional coefficient, gain, half-power beam width, and sidelobe level can be determined. However, in a specific field environment, when the antenna is regularly debugged, maintained, tested, and calibrated, most of the conventional methods will affect the normal use of t...

Claims

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Application Information

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IPC IPC(8): G01R29/10
Inventor 王壮程翥黄达王梦南王琦苗可可张雪琴王敬
Owner NAT UNIV OF DEFENSE TECH
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