Abstract:The calibration of channel amplitude/phase errors is necessarily required in order to achieve the performance of low side-lobe digital array. The relationships among channel amplitude/phase errors, array channels and the main performance (side-lobe level, beam direction, gain) of digital array are analyzed. Analysis results show that, the side-lobe, gain and beam direction would deteriorate as the amplitude/phase errors increase; the influence degree of amplitude/phase errors on the side-lobe level and beam direction would decrease as the number of the array channels increase; the influence of amplitude/phase errors on gain is independent on the number of the array channels. According to the adjustment problem of channel amplitude/phase errors in digital array application, as a complementary method of measuring the channel amplitude/phase errors, the principle, implementation methods and application conditions of internal-monitor and mid-field measurement are studied in detail. A calibration method of channel amplitude/phase errors is put forward. Simulation results show that after calibration, the channel amplitude/phase errors decrease from 2 dB and 20° to 0.4 dB and 2° respectively，which meets the expected specification.