Abstract
Due to the low cost and straightforward structure, the switch antenna array (SAA) frequency modulated continuous wave (FMCW) radar has been widely applied in many fields. However, the motion-induced phase always leads to inaccurate direction estimation of moving targets. Here, we proposed an elimination method of the motion-induced phase for the SAA FMCW radar. A double-time switching scheme (DTSS) is used for the reception of echo signals. Elimination of motion-induced phase is completed without estimating velocity, which can avoid the ambiguous velocity estimation problem. Additionally, the direction estimation of the moving target can be obtained by directly using a conventional digital beam forming (DBF) algorithm. The validity of the proposed method has been proved by the simulated and experimental results.
Highlights
The straightforward structure of frequency modulated continuous wave (FMCW) radar contributes to its broad application [1,2,3]
To solve the problems above, this paper proposes a computationally simple method to eliminate motion-induced phase for switch antenna array (SAA) FMCW radar, where a double-time switching scheme (DTSS) instead of a conventional switching scheme (CSS) is used for echo signals receiving
The simulated SAA FMCW radar operates at 10 GHz
Summary
The straightforward structure of frequency modulated continuous wave (FMCW) radar contributes to its broad application [1,2,3]. With the purpose to make an accurate estimation on target direction, researchers put forward phase compensation methods [9,10,11] Some of these methods are only applicable to TDM multiple-input-multiple-output (MIMO) FMCW radar. Lee [16] introduced the ‘time-invariant steering vector (TISV)’ to modify the conventional digital beam forming (DBF) algorithm and achieves multi-parameter (i.e., range, velocity, and direction) estimation. To solve the problems above, this paper proposes a computationally simple method to eliminate motion-induced phase for SAA FMCW radar, where a double-time switching scheme (DTSS) instead of a conventional switching scheme (CSS) is used for echo signals receiving.
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