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For spaceborne phased arrays, real-time antenna calibration plays a critically important role. It is the premise of high performance digital beamforming. Conventional antenna calibration approaches usually need to interrupt normal communication traffic flows to perform calibration and thus data satellite communications are interrupted. In this paper, an online calibration method without interrupting...
The number of array elements significantly influences the computational complexity of space-borne phased array antenna systems. When the satellite is on-orbit, the performances of space-borne phased array antennas will be easily influenced by the environment and devices aging. Therefore, the space-borne antennas need to be regularly calibrated after satellite is launched. However, the complexity of...
Online calibration of phased array antennas has attracted much attention due to the wide implementation of space-borne beam forming in telemetry and communication. In order to reduce the time consumption of calibration, a rapid acquisition method based on iterative message passing algorithm (iMPA) for code-divided calibration scheme is proposed. We transform the pseudo noise sequence into sparse graphical...
Misalignment aberrations in Fizeau interferometric testing system can significantly influence the measurement results in the case of high-numerical-aperture test spherical surfaces, and it is hard to separate the high-order misalignment aberrations from the measured data. The traditional calibration method, which is based on linear-approximation, is applicable in calibrating only the linear misalignment...
There are two methods commonly used for the performance test of voltage divider system. Step response method is used to measure the transient response of system, and frequency response method is used to measure the amplitude-frequency characteristics and phase-frequency characteristics. This paper discusses the equivalent conversion relationship of the characteristic parameters of time-domain and...
A simple digital background-calibration technique is proposed for a pipelined analog-to-digital converter (ADC). Both gain error and DAC error are measured and calibrated by injecting two uncorrelated pseudo-random sequences into the MDAC. With this method, not only small capacitors might be used, leading to small chip size, but also the traditional current starving high gain op-amps of pipelined...
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