您好！上图是40KHz超声波雷达测距驱动电路图，在调试过程中发现盲区过大（40cm）,PGA460的配置参数如下：
;GRID_USER_MEMSPACE
00 (USER_DATA1),99
01 (USER_DATA2),99
02 (USER_DATA3),99
03 (USER_DATA4),99
04 (USER_DATA5),99
05 (USER_DATA6),99
06 (USER_DATA7),18
07 (USER_DATA8),C6
08 (USER_DATA9),31
09 (USER_DATA10),8C
0A (USER_DATA11),63
0B (USER_DATA12),13
0C (USER_DATA13),15
0D (USER_DATA14),15
0E (USER_DATA15),15
0F (USER_DATA16),07
10 (USER_DATA17),00
11 (USER_DATA18),00
12 (USER_DATA19),00
13 (USER_DATA20),00
14 (TVGAIN0),6B
15 (TVGAIN1),CC
16 (TVGAIN2),CD
17 (TVGAIN3),28
18 (TVGAIN4),E7
19 (TVGAIN5),21
1A (TVGAIN6),94
1B (INIT_GAIN),03
1C (FREQUENCY),32
1D (DEADTIME),80
1E (PULSE_P1),24
1F (PULSE_P2),0A
20 (CURR_LIM_P1),07
21 (CURR_LIM_P2),53
22 (REC_LENGTH),14
23 (FREQ_DIAG),33
24 (SAT_FDIAG_TH),EE
25 (FVOLT_DEC),7C
26 (DECPL_TEMP),4F
27 (DSP_SCALE),00
28 (TEMP_TRIM),00
29 (P1_GAIN_CTRL),11
2A (P2_GAIN_CTRL),11
2B (EE_CRC),49
40 (EE_CNTRL),00
41 (BPF_A2_MSB),84
42 (BPF_A2_LSB),CC
43 (BPF_A3_MSB),FC
44 (BPF_A3_LSB),CE
45 (BPF_B1_MSB),01
46 (BPF_B1_LSB),99
47 (LPF_A2_MSB),7E
48 (LPF_A2_LSB),67
49 (LPF_B1_MSB),00
4A (LPF_B1_LSB),CD
4B (TEST_MUX),00
4C (DEV_STAT0),80
4D (DEV_STAT1),00
5F (P1_THR_0),83
60 (P1_THR_1),34
61 (P1_THR_2),45
62 (P1_THR_3),44
63 (P1_THR_4),45
64 (P1_THR_5),54
65 (P1_THR_6),FF
66 (P1_THR_7),C8
67 (P1_THR_8),21
68 (P1_THR_9),04
69 (P1_THR_10),21
6A (P1_THR_11),0B
6B (P1_THR_12),0B
6C (P1_THR_13),11
6D (P1_THR_14),12
6E (P1_THR_15),00
6F (P2_THR_0),88
70 (P2_THR_1),88
71 (P2_THR_2),88
72 (P2_THR_3),88
73 (P2_THR_4),99
74 (P2_THR_5),AB
75 (P2_THR_6),AC
76 (P2_THR_7),16
77 (P2_THR_8),83
78 (P2_THR_9),18
79 (P2_THR_10),A5
7A (P2_THR_11),3A
7B (P2_THR_12),3F
7C (P2_THR_13),45
7D (P2_THR_14),48
7E (P2_THR_15),00
7F (THR_CRC),AB
EOF
请问针对盲区过大问题以上配置参数怎么调整？谢谢！
