您好!我用2944配置波形之后,采集的ADC数据,每个chirp之前会有10%左右的冲击点,幅度很大,慢慢下降,后正常,如图所示,这是什么原因呢?
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用的是TI2944最新的demo板,XWR2944EVM,PROC113-REU. D,波形是自己设计的。
Start Freq (GHz) |
77 |
77 |
Sample Rate (ksps) |
30000 |
30000 |
IF(KHz) |
13500 |
13500 |
numADCSample |
384 |
384 |
1Dfft 点数 |
384 |
384 |
1dfft 保留点数 |
192 |
192 |
Chirps per Frames per Ant |
384 |
384 |
TX Start Time (us) |
2 |
2 |
ADC Start Time (us) |
3.5 |
3.5 |
chirpRampTime(us) |
12.8 |
12.8 |
Ramp End Time(us) |
16.3 |
16.3 |
Idle Time (us) |
5 |
11 |
Frequency Slope(MHz/us) |
9 |
9 |
Band(MHz) |
115.2 |
115.2 |
Chirp Step Freq(MHz) |
1.47 |
1.47 |
Frame Bw(MHz) |
564.48 |
564.48 |
Chirp Cycle Time (us) |
21.3 |
27.3 |
MIMO |
4Tx4Rx |
4Tx4Rx |
你好,
你是否有参考过下面文档的5.1,5.3,5.4章节?我初步怀疑是idle time或adc start time设置过小的问题。
https://www.ti.com/lit/an/swra553a/swra553a.pdf
Thanks,
Chris
你好,
请设置TX Start Time 为0,加大adc start time为4或者5,同时加大Ramp End Time,再尝试一下。
Thanks,
Chris