Under the constraint of DOA angles and sensor gains in the signal subspace, the estimation of sensor gain can be obtained without any calibration source.
运用信号子空间对信号DOA和通道增益的约束关系，在无校准源时，可以得到通道增益的估计。
The application research will include three parts: research on the calibration of digital signal source, error analysis and the best calibration interval.
检校应用研究分为三个部分：数字信号源的校准研究、测量误差分析及最佳测量周期的确定。
The hardware calibration also needs stabilized input signal source besides high-accuracy measuring device.
硬件校准除需要高精度的测量仪器外，还需要有稳定的输入信号源。
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