The ocean voyage is about to be carried out. As usual, the MRU compass and satellite station GPS (NavComSF3050) are tested and inspected.
Check tool
2 sets of Huaxing CORS stations (using Qianxun’s signal), 1 DC power supply, NavCom backup power cord, coaxial cable and antenna.
GPS inspection process
On the main interface of Seapath330, it is found that the differential signal cannot be used. Check the main engine of NavComSF3050, and find that the four lights of the main engine on the ship are flashing quickly. Communication with the agent is suspected to be a power supply problem. Check that the DC power supply is normal. Use a voltmeter. Measured the voltage, 11.8V.
After taking down the NavComSF3050 host, use the built-in DC power supply, antenna and coaxial cable, the lights are normal, the GPS light is always on (green), the differential signal light is always on (green), and then the stability and accuracy are tested. First use Qianxun CORS to measure the accurate coordinates, then replace the NavCom antenna with the CORS antenna to determine the stability and accuracy of NavCom.
Using HYPACK to collect positioning data, first find that there is no output data from the COM port, but the signal light on the MOXA flashes regularly, indicating that there is no problem with the data input. It is found that this MOXA is used as a SLAVE mode. You need to change this to Real COM mode.
Then, there is data in the COM port, and the output is not GGA, but a bunch of garbled codes. I recalled carefully, NavCom is the output RTCM differential signal, connect NavCom, set GGA
//Set the output parameters of port 2
[OUTPUT]OK,ONCHANGE,,2
[OUTPUT]NMEAGGA,ONTIME,0.2,2
[OUTPUT]NMEAVTG,ONTIME,0.20,2
[OUTPUT]NMEAZDA,ONTIME,0.20,2
At this point, the COM port has output GGA data, and the data starts to collect.
Compass checking process
The ship is berthing at the wharf and has been swinging slowly. It is necessary to compare the heading of the ship at the same time. First, open the navigation software on the ship and collect the heading of the ship. Then, to determine the front and back positions in the ship, you can use a meter ruler to determine The stern and the middle of the bow can also use some marking points/lines on the ship. Finally, to determine the heading of the ship, you can use a total station or two CORS stations. Due to the limited environment (the dock is narrow, It is impossible to observe two prisms at the same time), using two CORS stations. Since the accuracy of CORS is 2cm and the accuracy of the compass is about 0.065 degrees, when the ship length is 100m, the deviation is 10cm, so it is also feasible to use 2 CORS stations.
Use Huaxing A10/A16, A10’s mushroom head SIM card slot is the previous large card slot, there are 2 because the SIM card is bent, the signal cannot be detected, replaced with a second generation handbook, you can put the SIM card in the second generation handbook At this time, some checks and settings are required. First, whether there is a mobile signal strength sign, and then whether to open the network connection, whether to set to thin differential, if not set to thin differential, the mushroom head will always have "not detected SIM card", and finally check whether the service settings of Chihiro are correct.
The following is the Chihiro settings on the Haida device, from
https://www.sohu.com/a/377108401_120435367
1. Open the handbook software, enter the device interface, and click "mobile station" to enter the settings.
2. To access the Qianxun location service, usually select "Built-in network" or "Handbook differential". Data link selection: When the SIM card is inserted in the receiver, select "Built-in network" for the data link; when the SIM card is inserted in the handset, select "Handbook differential". Network antenna selection: "Network antenna" is selected according to the actual situation. If the network signal is not good, select "External antenna" and connect the external antenna; if the signal is better, you can use the internal antenna.
3. "Network Mode" can choose "GPRS, GSM, CDMA" according to different operators. Generally select "CDMA" for telecom cards, select "GPRS and GSM" for Unicom and mobile cards, and select 4G network first for "Network Type". When the signal is not good, the receiver will automatically switch to 3G and 2G signals.
4. "Operator": Enter "CMNET", "Username and Password" do not need to enter
5. Select "CORS" for server type
6. You can manually enter the domain name or IP address and port of the Qianxun server, and enter the corresponding Qianxun account username and password
Domain name: rtk.ntrip.qxwz.com or fill in IP: 203.107.45.154 (faster, more stable, safer, recommended!)
Port: 8001 Corresponding to the coordinate frame ITRF2008 Reference Epoch 2016.0
Port: 8002 corresponds to the coordinate frame WGS84 reference epoch 2005. 0
Port: 8003 corresponds to the coordinate frame CGCS2000 reference epoch 2000.0
Select the corresponding port to fill in according to the coordinate system you need to receive
7. Obtain the source node: Click "Settings" on the right to enter the source node acquisition interface. After obtaining the source node, select different source nodes according to the differential format supported by the receiver
RTCM23_GPS single satellite differential format, only broadcast GPS differential data
RTCM30_GG dual-star differential format, broadcast GPS, GLONASS differential data
RTCM32_GGB Samsung differential format, broadcast GPS, GLONASS, Beidou differential data
8. Go back to the "set mobile station" interface, click on the upper right corner "settings", if all the information is entered correctly, it will prompt "setup successful", wait a moment to get a fixed solution.