The Fast Correlative Interferometer Direction Finder using I/Q Demodulator

A dimension separation-based two-dimensional correlation interferometer algorithm

“…It can be seen in (8) that the direction of incident wave resides in the phase differences between elements. Ideally, the incoming direction of incident signal can be determined by any phase difference pair through finding the solution to two equations similar to (8).…”

“…Ideally, the incoming direction of incident signal can be determined by any phase difference pair through finding the solution to two equations similar to (8). However, because of the received noise, mutual coupling or system error, different direction finding results will be obtained when using different phase difference pairs.…”

“…The correlation interferometer [5,6] is the most popular one among phase interferometers. It can reduce the effect from mutual coupling and system error through comparison between measured phase difference vector and phase difference vectors in sample database [7,8]. For two-dimensional direction finding [9], the sample database consists of phase difference vectors.…”

2D DOA Estimation of UCA Correlative Interferometer Based on One Dimensional Sorting Lookup Table-Two Dimensional Linear Interpolation Algorithm

“…As the phase difference value is from - to , so there is a flip phenomenon for the phase difference at ±, which will cause a bigger direction finding error. In order to solve this problem, in this paper, we use the maximum cosine sum criterion [13], [14] as the comparison function, which can be expressed as follows.…”

“…So, it has been widely used in recent years [13][14][15][16][17][18][19]. As can be seen from the direction finding principal that the DOA estimation precision of the correlative interferometer must be ensured by the sample data precision, which inevitably brings about the high computational complexity and big data storage burden [12][13][14][15][16], [19]. Especially in the case of broadband signal and large view field, there will be impossible burdens for the processor.…”