受视场角限制,由单点探测器构成的外差系统不能充分接收信号光功率。若用阵列探测器代替单点探测器进行探测,可以增大接收视场,从而增强接收的信号光功率。在考虑到热噪声、光电流饱和效应的前提下,对这种阵列探测系统的信噪比进行了分析。结果显示,相对于单点探测系统,阵列系统能较大幅度地提高信噪比。分析结果指出,由于叠加的热噪声存在,当阵列中单元数增加到一定数量后,信噪比不能得到进一步提高。还对非等相位叠加因素对系统性能的影响进行了分析。由于系统输出信号是各探测单元输出信号的叠加,实际应用中不可能实现完全的等相位叠加,通过数值计算,分析了该因素的影响,并指出它可以在硬件设计过程中得到有效控制。 Due to the limited field of view, heterodyne systems consisting of single-point detectors can not adequately receive signal light power. If the array detector instead of single-point detector for detection, you can increase the receiving field of view, thereby enhancing the received signal light power. Taking into account the thermal noise, photocurrent saturation under the premise of this array detection system, the signal to noise ratio was analyzed. The results show that the array system can greatly improve the signal-to-noise ratio compared to the single-point detection system. The analysis shows that the signal to noise ratio can not be further improved due to the superimposed thermal noise when the number of cells in the array is increased by a certain amount. The effects of non-equal phase superposition factors on system performance were also analyzed. Since the output signal of the system is the superposition of the output signals of the detection units, it is impossible to achieve complete equal-phase superimposition in practical applications. The influence of this factor is analyzed through numerical calculation, and it is pointed out that it can be effectively controlled in the hardware design process.