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本文介绍一种简便的码组相关函数的测试方法,可以用于某些需要编码的数字通讯、雷达测距、电离层及对流层信道探测中对码型的选择。根据相关函数的定义,用 TTL 电路与计数式频率计配合,方便地直接读出相关函数值。测量误差随码长的增加而减小(≤2/L)。在没有相关函数测量仪的情况下,可以满足工程设计者的需要。并以 PN 码和 gold 码为例具体介绍其测试方法。
This article presents a simple test method for code group correlation functions that can be used to select patterns in some digital communications that require encoding, ranging in radar, ionosphere and tropospheric channels. According to the definition of the correlation function, TTL circuit and counting frequency meter with easy to read out the correlation function value. The measurement error decreases as the code length increases (≤2 / L). In the absence of correlation function measuring instrument, to meet the needs of the project designer. And PN code and gold code as an example to introduce its test method.