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Design and measurement of channel calibration for digital array with orthogonal codes
By: Xiaofeng Ma; Si Qin; Weixing Sheng;
2012 / IEEE / 978-1-4673-2185-3
This item was taken from the IEEE Conference ' Design and measurement of channel calibration for digital array with orthogonal codes ' In order to realize an accurate multi-beam forming for Digital Array Radar (DAR) system, a calibration method-the Unitary Transform Encoding (UTE)-for revising the amplitude/phase imbalance among transmitting channels is proposed. This method employs set of orthogonal codes that are sequentially applied to all channels, allowing elements to be measured in-situ simultaneously by receiving a sum signal. Intermediate Frequency (IF) signal processing has turned into its key technique because it determines the precision of calibration factors. In this paper, for testing the effectiveness of UTE method on engineering application, we design a hardware circuit platform that adopts IF software radio architecture based on FPGA. The platform integrated digital-analog converters (DAC) and analogdigital converters (ADC) so that we can realize the UTE encoded-decoded processing to obtain the calibration factors. The results of measurement show that the UTE method is a fairly effective to calibrate amplitude/phase imbalance for multi-beam DAR system and the beam pattern is considerably close to ideal beam pattern after calibration.
Radar Signal Processing
Ideal Beam Pattern
Channel Calibration Measurement
Channel Calibration Design
Digital Array Radar System
Unitary Transform Encoding
Intermediate Frequency Signal Processing
Ute Encoded-decoded Processing
Multi-beam Dar System
Field Programmable Gate Arrays
Multi-channel Amplitude/phase Imbalance Calibration
Array Signal Processing
If Software Radio Architecture