A new type of alternating code for incoherent scatter measurements
A new type of alternating code for incoherent scatter measurements
复制标题
一种用于非相干散射测量的新型交替码
DOI：
10.1029/93rs01918
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发表时间：
1993
期刊：
影响因子：
1.6
通讯作者：
M. Sulzer
中科院分区：
文献类型：
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作者：
M. Sulzer
一个交替的代码集采用的几种可能的技术之一，用于非相干散射雷达传输，以获得具有良好的距离分辨率的自相关函数或频谱的模糊度自由测量。交替码集由几个码组成;通常，每个连续的雷达脉冲用序列中的不同码调制。假设目标具有某些统计特性，当目标被覆盖时，这种技术在其他类型的雷达传输中是有用的。针对码长8-12提出了一种新型交替码的码集。这种新型的交替码与第一种交替码有两个不同之处：它在消除歧义方面有一个稍微不同的条件，并且它的长度不限于2的幂。新的长度是有用的，因为它们允许更大的自由度，在设计一个多用途的雷达波形最好地利用雷达的可用占空比。交替代码技术的详细描述足以让理解的两种类型，并表明，无歧义测量的新条件是一个有用的。一个搜索程序被用来找到新的集合，减少搜索空间的大小的程序的重要方面进行了说明。介绍了这些代码集，并讨论了它们的意义和用途。
An alternating code set is employed as one of several possible techniques used in incoherent scatter radar transmissions to obtain ambiguity-free measurements of autocorrelation functions or spectra with good range resolution. An alternating code set consists of several codes; typically, each successive radar pulse is modulated with a different code in the sequence. This technique is useful in other types of radar transmissions when the target is overspread, assuming the targets have certain statistical properties. Code sets for a new type of alternating code are presented for code lengths 8–12. This new type of alternating code differs from the first kind in two ways: it is subject to a slightly different condition for the elimination of ambiguity, and it is not restricted to lengths that are powers of 2. The new lengths are useful because they allow greater freedom in designing a multipurpose radar waveform best utilizing the available duty cycle of the radar. The alternating code technique is described in detail sufficient to allow an understanding of the two types and to show that the new condition for ambiguity-free measurements is a useful one. A search program was used to find the new sets; the aspects of the program important for decreasing the size of the search space are described. The code sets are presented, and their significance and uses are discussed.