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1021results about "Antenna radiation diagrams" patented technology

All airspace active multi beam spherical phased array antenna direction diagram measurement system

ActiveCN104101786AOvercoming the high cost of recombinationChange geometry directionAntenna radiation diagramsElevation angleTower
The invention provides an all airspace active multi beam spherical phased array antenna direction diagram measurement system. The provided measurement system has the advantages of flexible control, high directional accuracy and low cost, and uses electric scanning to replace mechanical scanning. According to the technical scheme provided by the invention, when a direction diagram test link is received, a signal transmitting and receiving device transmits a test frequency point signal to an auxiliary antenna of a calibration tower; a spherical phased array antenna receives a signal transmitted by the auxiliary antenna; a receiving beam is formed through an active digital multi-beam forming device; the signal transmitting and receiving device receives and records the signal level, and reports the signal level to automation test software of an automation test device; the automation test software of the automation test device controls the active digital multi-beam forming device to form a transmitting and receiving beam in a certain direction and acquire the signal level of the transmitting and receiving beam; two-dimensional electric scanning is carried out on the whole airspace; and three-dimensional images are respectively drawn for the directional azimuth and the elevation angle of the transmitting and receiving beam, and the signal level corresponding to the direction, so as to acquire a transmitting and receiving three-dimensional direction diagram of the antenna.
Owner:10TH RES INST OF CETC

Phased array antenna unit characteristic near-field measurement method

ActiveCN103926474AEliminate coupling interferenceSolve the technical problem of coupling interferenceAntenna radiation diagramsMeasurement pointArray element
The invention provides a phased array antenna unit characteristic near-field measurement method. The near-field measurement method can measure directional diagrams and opening surface near fields of independent units when all the units work at the same time. According to the technical scheme, the method comprises the steps of selecting a measured phased array antenna AUT, and using a vector network analysis meter PNA connected with a PC and a controller and a near-field scanning frame probe respectively connected with the PNA and the controller to form a near-field measuring system for detecting the antenna unit amplitude phase characteristics. The AUT is used as a transmitting antenna, the probe is used as a receiving antenna, and the scanning frame probe is arranged in front of the opening face of a measuring antenna. Devices are connected according to a near-field measuring method, when the magnitude-phase characteristic am of the mth unit of the phased-array antenna is measured, a vector average method is adopted by each measuring point in a near-field scanning plane, a T/R component, an array element and the magnitude-phase characteristic H m<n>=a<m> S m<n>, n=1,...N from the array element to a measuring point space link assembly of the mth unit are measured and calculated, and the magnitude-phase characteristic am of the phased-array measuring unit is calculated.
Owner:10TH RES INST OF CETC

Automatic measuring system of antenna phase center

The invention discloses an automatic measuring system in the center of an antenna phase, which comprises an antenna receiving rotary table subsystem, an emission polarizer subsystem, an emission and reception subsystem, a servo drive digital display subsystem and a computer subsystem. The antenna receiving rotary table subsystem and the emission polarizer subsystem are both connected with the emission and reception subsystem, the servo drive digital display subsystem and the computer subsystem; wherein, the antenna receiving rotary table subsystem consists of a direction rotary table (1), a two-dimensional translation device (2), a bracket (3) and an antenna polarizer (4). The two-dimensional translation device (2) is positioned between the direction rotary table (1) and the antenna polarizer (4) and used for automatically adjusting the positions of an antenna and the rotating axis of the direction rotary table, thereby making the phase center of the antenna near the axle center of the rotary table and ensuring the stable positions of the rotating axis of the direction rotary table and the rotating axis of the antenna polarizer when the direction rotary table is rotating. The automatic measuring system provided by the invention has the advantage of high measuring automation and can be used to accurately mark the phase centers of antennas.
Owner:XIDIAN UNIV

Method and apparatus for providing feeder cable insertion loss detection in a transmission system without interfering with normal operation

A method and apparatus for measuring a change in the insertion loss of a transmission line in a communication system is disclosed. The method provides feeder cable insertion loss detection in a transmission system without interfering with normal operation. The method includes injecting a non-interfering signal at a predetermined frequency onto a cable providing normal operating signals to a narrowband device at a predetermined frequency, measuring the amplitude of the injected signal, measuring the amplitude of a reflected signal, the injected signal being reflected by the narrowband device and processing the amplitude of the injected signal and the amplitude of the reflected signal to derive a current insertion loss for the cable. In addition, the method further includes comparing the current insertion loss to a prior insertion loss and determining the cable to be defective when the current insertion loss differs from the prior insertion loss by a predetermined amount and replacing the cable when the current insertion loss differs from the prior insertion loss by the predetermined amount. The injecting further includes selecting a signal for injection having a frequency and power that does not interfere with the normal operating signals and which causes the signal to reflect back from the narrowband device. The frequency of the selected signal for injection causes the narrowband device to appear to the selected signal for injection as a short or an open. The narrowband device is an antenna, a low noise amplifier, a power amplifier, a filter or a RF-to-light converter for a fiber optic distribution network.
Owner:NOKIA SOLUTIONS & NETWORKS OY

Antenna phase center measuring method based on moving reference point

The invention discloses a method for measuring the phase center of an antenna, which is based on moving reference points. The method provided by the invention mainly solves the measuring problems of manual operation and artificial judgment. The method includes the following steps: in the measuring system, a measured antenna is adjusted to face an original antenna and is taken as the zero point of a measuring angle; the horizontal direction and the vertical direction of a two-dimensional translation device are controlled to reset and taken as the datum reference point of the phase center test; related parameter information is input and all moving shafts are controlled automatically, thereby collecting the amplitude and phase data of the measured antenna; the horizontal deviation and the longitudinal deviation of the phase center can be worked out by using the least square method and then can be determined whether the deviation of the phase center meets the deviation requirements of the designed phase center of the antenna; if not, the reference point of the antenna can be changed by automatically adjusting the horizontal coordinate and the vertical coordinate of the two-dimensional translation device according to the deviation value; the test can be repeated again and again until the horizontal deviation and the longitudinal deviation meet the requirements; and the final changed reference point can be taken as the phase center of the measured antenna. The method provided by the invention can automatically and accurately measure the phase center of an antenna.
Owner:XIDIAN UNIV
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