修复描述错误
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@ -76,7 +76,7 @@ ASIC 平台下,匹配滤波器系数由 DDS 载波与权重参数实时计算
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$$\text{FilterCoeff}[n] = \text{Weight}[n] \times e^{j(2\pi f_{IF} \cdot n / F_s + \phi)}$$
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$$\text{FilterCoeff}[n] = \text{Weight}[n] \times e^{j(2\pi f_{IF} \cdot n / F_s + \phi)}$$
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其中 $f_{IF}$ 为中频频率(由 `dds_fpw.fcw` 决定),$F_s$ 为采样率。
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其中 $Weight[n]$ 为下载数据经`STEP_CTRL`控制临近插值后权重,$f_{IF}$ 为中频频率(由 `dds_fpw.fcw` 决定),$F_s$ 为采样率。
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**权重设计要点**:
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**权重设计要点**:
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@ -99,7 +99,7 @@ FPGA 平台下,匹配滤波器系数需预计算并直接存入 DAQ_FLT(`0x0
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$$\text{I\_Coeff}[n] = \text{Weight}[n] \times \cos(2\pi f_{IF} \cdot n / F_s + \phi)$$
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$$\text{I\_Coeff}[n] = \text{Weight}[n] \times \cos(2\pi f_{IF} \cdot n / F_s + \phi)$$
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$$\text{Q\_Coeff}[n] = \text{Weight}[n] \times \sin(2\pi f_{IF} \cdot n / F_s + \phi)$$
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$$\text{Q\_Coeff}[n] = \text{Weight}[n] \times \sin(2\pi f_{IF} \cdot n / F_s + \phi)$$
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其中每个采样点 n 对应一个时钟周期(FPGA: 16 ADC samples/cycle)。
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由于FPGA每个时钟周期对应16个采样点,解模系数`I_Coeff[n]`和`Q_Coeff[n]`长度需要为16的整数倍。
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**存储布局注意**:每个时钟周期的 128 位数据(16 samples × 8 bit)需按大端字节序排列,I/Q 分开存储且地址偏移为 16 KB(见 [§4.4.2](#442-匹配滤波器系数) 存储结构图)。
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**存储布局注意**:每个时钟周期的 128 位数据(16 samples × 8 bit)需按大端字节序排列,I/Q 分开存储且地址偏移为 16 KB(见 [§4.4.2](#442-匹配滤波器系数) 存储结构图)。
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