Antenna delay test method
A test method and antenna delay technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as loss details, affecting delay curves, etc., and achieve the effect of wide application range, wide applicability and promotion and application value
Active Publication Date: 2015-07-08
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology
The selected aperture will affect the obtained delay curve. If the value is too large, the details will be lost; if the value is too small, the influence of noise superimposed on the measured value will be highlighted
[0004] Since a loop needs to be formed by using a vector network analyzer to test antenna delay, it is necessary to introduce a standard delay antenna to form a transceiver link with the antenna under test to use a vector network analyzer to test the link, but how accurate is the delay of the standard delay antenna? Testing has always been an intractable problem
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[0030] If there is a point that can make the phase pattern function of the antenna relative to this point a constant in the antenna main lobe area (that is, the equiphase surface of the antenna far field is a spherical surface with this point as the center of the sphere), then this point is called the antenna phase center of . Antenna delay is defined as the time required for electromagnetic waves to travel from the antenna phase center to the feed port.
[0031] To test the antenna time delay, the site needs to meet the antenna far-field test conditions, and the distance between the antenna transceiver is R≥2D 2 / λ, which satisfies the far-field condition of the antenna, where D is the maximum aperture of the antenna under test, and λ is the working wavelength of the antenna under test. The test environment requires no electromagnetic interference to reduce the delay test error caused by the environment. During the test, special attention should be paid to the connection of t...
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The invention discloses an antenna delay test method. The antenna delay test method includes: three standard delay antennas of the same form, which are on the same frequency as an antenna to be tested and as polarized as the antenna to tested, are added in a microwave unaffected chamber meeting antenna far-field conditions; two of the standard delay antennas form a transceiving link which meets the antenna far-field conditions; combined delay of the transceiving link is measured with a vector network analyzer; according to three groups of measured combined delay values, the delay value of any standard delay antenna is obtained through simultaneous equations; the standard delay antenna with the delay known and the antenna to be tested form a transceiving link which meets the antenna far-field conditions; combined delay of the transceiving link is measured with the vector network analyzer; and the delay time of the tested antenna is solved by using the delay of the standard delay antenna as a known quantity. The antenna delay test method is simple, high in test precision and widely applicable.
Description
technical field [0001] The invention relates to an antenna delay test method, in particular to an antenna delay test method using a vector network analyzer and three standard delay antennas. Background technique [0002] With the development of aerospace technologies such as communication satellites, navigation satellites, and spaceborne SAR, the requirements for antenna tracking and positioning accuracy are getting higher and higher. Compared with the past, satellites have put forward more complex functions and very demanding requirements for antennas and their subsystems. Searching and positioning by amplitude beams alone can no longer meet the requirements. Take navigation satellites as an example: the various business services they provide are all The distance is calculated by measuring the time delay of the carrier signal transmitted between the satellite and the ground. Therefore, the accuracy of the delay test of the antenna is directly related to the ranging accurac...
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IPC IPC(8): H04B17/00H04B17/12H04B17/364
Inventor 李黎冯德会赵东升吴春邦刘灵鸽杨文丽
Owner XIAN INSTITUE OF SPACE RADIO TECH