A major concern for adaptive antennas is the calibration of hardware. Here we consider the calibration of an analog beamformer (ABF), which calculates the weights in a digital signal processor (DSP), but weights the R...
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A major concern for adaptive antennas is the calibration of hardware. Here we consider the calibration of an analog beamformer (ABF), which calculates the weights in a digital signal processor (DSP), but weights the RF signals using a hardware beamformer. Two novel methods are presented of performing a calibration of this adaptive antenna during normal operation. This will mitigate temperature drift and aging of active components. Both methods uses a feedback of the beamformer output signal, to calculate the error in the beamformer output, or to identify the parameters in the temperature drift, The algorithms are transparent to normal antenna operation and are computationally simple. Simulations show that when using these auto-calibration methods, the performance is independent of variation in hardware parameters when a realistic temperature drift is introduced. The proposed algorithms are intended for use in a time-division multiple access (TDMA) mobile telephone system, but the methods are applicable in radar systems also.
The anti-jamming ability of heterogeneous array antenna in complex electromagnetic environment is discussed and compared with uniform array and orthogonal dipole array in this paper. A circular heterogeneous array mod...
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ISBN:
(纸本)9798350353129;9798350353136
The anti-jamming ability of heterogeneous array antenna in complex electromagnetic environment is discussed and compared with uniform array and orthogonal dipole array in this paper. A circular heterogeneous array model based on sample matrix inversion (smi) algorithm is adopted. Simulation experiments verify the ability of the model to receive signals and suppress interference under various conditions. The results show that the array produces significant zero values in the interference direction, while effectively maintaining the signal integrity. In addition, it is particularly noteworthy that the anti-jamming ability of the heterogeneous array using only 8 channels matches that of the orthogonal dipole array using 16 channels, which not only reduces the cost and simplifies the design, but also improves the resource utilization.
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