多通道接收机幅相校准测试系统的设计

在多通道宽带雷达接收机中，通道内I／Q支路、通道之间的幅相均衡是接收系统的关键指标。文中介绍了某接收系统的校正原理，并基于GPIB总线接口，采用智能仪表组建了幅相校准测试系统，实现接收机幅相一致性参数自动测量，解决了测试参数多、测试量大的问题，并通过幅相调节网络补偿各通道的幅度和相位，提高接收系统的幅相一致性水平。

Design of Testing System for Calibration of Amplitude and Phase of Multichannel-receiver

In the broad band multichannel-radar-receiver, both the I/Q branch inside the channels and the amplitude and phase equalization among the channels are the critical criteria of the received system. This article introduces the calibrating principle of certain receiver, which based on the GPIB bus-interface and constructed testing system for calibration of amplitude and phase by applying the intelligent meter. In the end, the author accomplished the parameter auto-measurement for consistency of amplitude and phase in the receiver, solved problems of diversity of the testing parameters and complexity of the testing, also compensated the amplitude and phase in each channel by using the regulating network of amplitude and phase and improved the consistent level of amplitude and phase in the receiver.