方法二： DACM算法. 雷达通常得到是IQ两支路信号，两支路之间的不匹配不可避免，提到一种DACM algorithm来恢复信号的相位信息。 \[s\left[ n \right] = A\left[ n \right]\exp \left( {j\varphi \left[ n \right]} \right) = I\left[ n \right] + jQ\left[ n \right]\]

In this paper, aiming to solve the null point and nonlinear issues in small-angle approximation-based Doppler radar sensors and eliminate the codomain restriction in the arctangent demodulation approach, we propose and investigate an extended differentiate and cross-multiply (DACM) algorithm.

Then, the sampled baseband signal goes through a demodulation module that uses the extended differentiate and cross multiple (DACM) algorithm to obtain sleep-related displacement signal.

May 25, 2020 · After applying the circular center dynamic tracking algorithm to correct the DC offset, the extended DACM allows us to obtain effective heartbeat and breathing-related phase information. Two methods, CS-OMP and RA-DWT, are proposed to process the extracted differential phase signal.

Jan 1, 2014 · In this paper, aiming to solve the null point and nonlinear issues in small-angle approximation-based Doppler radar sensors and eliminate the codomain restriction in the arctangent demodulation...

Comparison of the proposed DACM (b) with the framework of existing state-of-the-art methods (a). There are three main differences. (1) We propose to utilizeGP-based kernel functions for similarity measurement. (2) We use covariance matricesinstead of cosine …

由于Farsense不能像商用设备一样得到呼气吸气的波形，本文中引入the extended differentiate and cross-multiply (DACM) algorithm用于评估呼吸信号在复平面中的旋转方向。该算法计算反正切解调相位信息的粗略导数，其中正导数正好对应于逆时针旋转方向，反之亦然。

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文中还提到，在相位突然变化的情况下，普通的展开方式可能会引入错误，使用DACM算法(differentiate and crossmultiply algorithm)可以减轻这个问题。 引用的两篇文章中有详细的介绍DACM算法。

Based on the differentiation and the geometrical theorem of the trigonometric functions, this paper proposes a modified DACM algorithm with simplified expression but much improved performance for high-linear motion detection. Theoretical analysis was …