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基于调频广播的单站无源定位系统一直受到人们的关注。分析该系统中放大器的非线性对地物杂波抑制性能的影响,给出非线性系数与相消比(抑制性能)之间的关系公式。根据该公式,结合A/D变换器位数和所需最小相消比,可以估计使用给定放大器时的动态范围。最后,对仿真信号的处理和实际系统中放大器参数的实例分析验证上述的分析和得出的结论。
Single-station passive location system based on FM radio has always been the focus of attention. The influence of the amplifier nonlinearity on the clutter suppression performance is analyzed. The relation between the nonlinear coefficient and the cancellation ratio (suppression performance) is given. Based on this formula, combined with the A / D converter bits and the required minimum cancellation ratio, it is possible to estimate the dynamic range when using a given amplifier. Finally, the above analysis and conclusion are validated by the simulation signal processing and the practical analysis of the amplifier parameters in the system.