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这个相位差是由天线布线引起的。请看下面文档里的说明。 Line Feed: The RX line feeds on xWR6843AOP ES2 are same as on ES1 i.e. RX1 and RX2 are fed from opposite ends, which results in a 180° phase difference between RX1 and RX2. Similarly, RX3 and RX4 are out of phase by 180°. https://www.ti.com/lit/an/swra656c/swra656c.pdf
如何补偿见文档说明。 RX Channel Phase Compensation: To compensate for the opposite line feeds as shown in Section 5.12, a 180° phase inversion is applied to the corresponding RX channels (including virtual channels) using the compRangeBiasAndRxChanPhase CLI command available in the mmw demo.
