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Livox Lidar+APX15 实时高精度雷达建图复现整理
2022-06-27 19:56:00 【lucky li】
https://github.com/Livox-SDK/livox_high_precision_mapping/blob/master/doc/cn/README.md
由于非常依赖gps和rtk服务,所以天气影响很大,4g信号也很重要,室内根本用不了。
核心代码非常简单,就一个cpp,用apx-15芯片定位和时间同步,然后将扫描到的点云增量的加到地图中,买了硬件都可以做。
硬件连接
APX-15 UAV 链接
Applanix APX-15UAV是GNSS-惯性组合导航OEM产品,为小型无人机测图系统设计。能够降低作业成本,提高测图效率,通过POS Pac后处理软件,在测绘领域中可取消或减少地面控制点(GCP)和减少飞行的旁向重叠,从而增加每次飞行项目时的飞行面积。5000元
https://www.applanix.com/cn/products/dg-uavs.htm
https://item.taobao.com/item.htm?spm=a230r.1.14.16.158611b4s3cVBY&id=535437203538&ns=1&abbucket=1#detail
- 接gps(antenna)
MMCX接口:连接GNSS天线 (输入gps)
- 接livox(mid40)
PIN12:GND
PIN13:输出PPS信号(提供硬件时间同步信号给雷达)
- 接jetson(nano)
PIN12:GND
PIN20:COM1 Tx,输出GNRMC数据(输出每次PPS脉冲对应的时间信息https://www.cnblogs.com/88223100/p/gprm_gnrmc_transform.html)(rs232转usb)
PIN12:GND
PIN22:COM3 Tx,输出GSOF的INS Full Navigation Info数据(输出gps+imu处理后的数据https://www.trimble.com/OEM_ReceiverHelp/v5.11/en/GSOFmessages_INS-FullNav.html)(ttl 转usb)
- 接4g无线网卡(huawei wifi 2 pro)
PIN27/29/31/33:RJ45有线网络接口,用于传输网络RTK服务NTRIP数据.(转网线接4g网络)(RTK服务就是让gps的精度从米级提升到厘米级,利用周边的基站信号载波分析,付费的)
- 接电源
PIN42:电源GND
PIN44:电源+24v输入
其他链接

GNSS signal:GPS天线,给APX-15提供卫星信号;
NTRIP:网络接口,用于无线网络模块和APX-15之间交互网络RTK服务的NTRIP数据;
PPS:TTL电平接口,给Mid-40提供硬件时间同步信号;
Point Data:Manifold和Livox转接盒通过网口,传输Mid-40的点云数据;
GNRMC:USB转RS232电平,接入Manifold,给Mid-40提供每次PPS脉冲对应的时间信息;
GSOF:USB转TTL电平,接入Manifold,传输APX-15输出的姿态、位置数据;
Power:使用24v直流电源,给Manifold、Mid-40、APX-15供电;
软件执行
https://github.com/Livox-SDK/livox_high_precision_mapping/blob/master/doc/cn/README.md
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