Changes for page LMDS200 -- LoRaWAN Microwave Radar Distance Sensor User Manual
Last modified by Mengting Qiu on 2024/03/07 08:41
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... ... @@ -912,7 +912,56 @@ 912 912 **Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>path:/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/]] 913 913 914 914 915 += 3. LiDAR ToF Measurement = 915 915 917 +== 3.1 Principle of Distance Measurement == 918 + 919 +The LiDAR probe is based on TOF, namely, Time of Flight principle. To be specific, the product emits modulation wave of near infrared ray on a periodic basis, which will be reflected after contacting object. The product obtains the time of flight by measuring round-trip phase difference and then calculates relative range between the product and the detection object, as shown below. 920 + 921 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image001.png]] 922 + 923 + 924 + 925 +== 3.2 Distance Measurement Characteristics == 926 + 927 +With optimization of light path and algorithm, The LiDAR probe has minimized influence from external environment on distance measurement performance. Despite that, the range of distance measurement may still be affected by the environment illumination intensity and the reflectivity of detection object. As shown in below: 928 + 929 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png]] 930 + 931 + 932 +①Represents the detection blind zone of The LiDAR probe, 0-10cm, within which the output data is unreliable. 933 + 934 +②Represents the operating range of The LiDAR probe detecting black target with 10% reflectivity, 0.1-5m. 935 + 936 +③Represents the operating range of The LiDAR probe detecting white target with 90% reflectivity, 0.1-12m. 937 + 938 + 939 +Vertical Coordinates: Represents the radius of light spot for The LiDAR probe at the different distances. The diameter of light spot depends on the FOV of The LiDAR probe (the term of FOV generally refers to the smaller value between the receiving angle and the transmitting angle), which is calculated as follows: 940 + 941 + 942 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image003.png]] 943 + 944 + 945 +In the formula above, d is the diameter of light spot; D is detecting range; β is the value of the receiving angle of The LiDAR probe, 3.6°. Correspondence between the diameter of light spot and detecting range is given in Table below. 946 + 947 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image004.png]] 948 + 949 + 950 +If the light spot reaches two objects with different distances, as shown in Figure 3, the output distance value will be a value between the actual distance values of the two objects. For a high accuracy requirement in practice, the above situation should be noticed to avoid the measurement error. 951 + 952 + 953 + 954 +== 3.3 Notice of usage: == 955 + 956 +Possible invalid /wrong reading for LiDAR ToF tech: 957 + 958 +* Measure high reflectivity object such as: Mirror, Smooth ceramic tile, static milk surface, will have possible wrong readings. 959 +* While there is transparent object such as glass, water drop between the measured object and the LiDAR sensor, the reading might wrong. 960 +* The LiDAR probe is cover by dirty things; the reading might be wrong. In this case, need to clean the probe. 961 +* The sensor window is made by Acrylic. Don’t touch it with alcohol material. This will destroy the sensor window. 962 + 963 + 964 + 916 916 = 4. Configure LLDS12 via AT Command or LoRaWAN Downlink = 917 917 918 918 ((( ... ... @@ -929,7 +929,7 @@ 929 929 ((( 930 930 931 931 932 -There are two kinds of commands to configure LS PH01, they are:981 +There are two kinds of commands to configure LLDS12, they are: 933 933 ))) 934 934 935 935 * ((( ... ... @@ -960,7 +960,7 @@ 960 960 ))) 961 961 962 962 ((( 963 -These commands only valid for LS PH01, as below:1012 +These commands only valid for LLDS12, as below: 964 964 ))) 965 965 966 966 ... ... @@ -1003,9 +1003,11 @@ 1003 1003 1004 1004 (% style="color:#037691" %)**AT Command: AT+INTMOD** 1005 1005 1006 -[[image:image-2022060 7171716-9.png]]1055 +[[image:image-20220610105806-2.png]] 1007 1007 1008 1008 1058 + 1059 + 1009 1009 ((( 1010 1010 (% style="color:#037691" %)**Downlink Command: 0x06** 1011 1011 ))) ... ... @@ -1038,6 +1038,7 @@ 1038 1038 * Reply to the confirmation package: 26 01 1039 1039 * Reply to non-confirmed packet: 26 00 1040 1040 1092 + 1041 1041 Device will send an uplink after got this downlink command. With below payload: 1042 1042 1043 1043 Configures info payload: ... ... @@ -1059,7 +1059,7 @@ 1059 1059 Always 0x02 1060 1060 ))) 1061 1061 1062 -**Software Type**: Always 0x03 for LS PH011114 +**Software Type**: Always 0x03 for LLDS12 1063 1063 1064 1064 1065 1065 **Frequency Band**: ... ... @@ -1105,7 +1105,7 @@ 1105 1105 1106 1106 0x06: LSNPK01 1107 1107 1108 -0x07: LD DS121160 +0x07: LLDS12 1109 1109 1110 1110 1111 1111
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