DP-filter Smooth Technology: Pass to Pass Solution for Agricultural Guidance Systems
GNSS receivers operating in the single-point autonomous mode offer a horizontal accuracy of around 1.5 meters. While this might sound precise, it often experiences significant drift due to pseudorange accuracy inconsistencies and a lack of correction inputs during positioning calculations. In specific applications, like agricultural guidance systems, it isn't the absolute accuracy that counts but the relative precision across continuous epochs and adjacent paths. Discontinuities, even minor ones, can be highly problematic for users.
Enter ComNav Technology's DP-filter, a state-of-the-art smoothing filter algorithm that leverages carrier phase, delta-carrier phase, pseudorange, and Doppler observations. This article dives into the DP-filter's technical underpinnings, configuration, tested results, and its potential application scenarios.
1. Technical Introduction
Carrier phases offer superior accuracy, reduced noise, and increased resistance to multipath effects. Drawing from these advantages, the DP filter refines relative positioning precision, ensuring smooth and consistent outcomes unaffected by pseudorange inaccuracies. When engaged, this filter delivers consistent position error and assures a smooth (pass to pass) accuracy within the sub-meter to centimeter range.
2. Smooth Mode configuration
Here is how to enable the Smooth mode for SinoGNSS K8 series OEM modules.
2.1. Activating the Smooth Mode
● Enable the feature: Begin by sending the command `Set smoothedpvt on`. This instruction activates the smooth mode.
●Save the configuration: Once you've activated the mode, make sure you save the configuration. Do this by sending the command `Saveconfig`.
2.2. Verifying the Smooth Mode Activation
To check if your OEM board is operating in the smooth mode:
● Output the `GPGGA` message.
● In the displayed message, inspect the solution status. If it reads `E,1`. Moreover, the differential age value should be `99`. It indicates that the board is in smooth mode.
For instance, the message should resemble the following format:
`$GPGGA,000359.00,3125.4999742,N,12136.9969461,E,1,07,2.5,10.4541,M,11.371,M,99,00 00*4C`
3. Test Results
ComNav Technology conducted tests on the DP-filter smoothing function of the K803 Lite module. The results provided insights into the DP-filter smooth function's performance and applications.
3.1. Test Methodology
- Environment: The test was done on the roof of ComNav Technology's building to minimize interference from obstacles.
- Procedure:
- The GNSS modules and antenna were installed on a trolley.
- The trolley was pushed repeatedly along a straight line in a consistent direction.
- The accuracy of the K803 Lite was measured by comparing its multiple trajectories and contrasting with RTK trajectories.
3.2. Test Findings:
- This test simulated conditions in areas without BDS-2 coverage.
- The pass-to-pass accuracy for the K803 single-frequency was about 15cm.
- No significant track deviation was observed across 31 laps.
- The final trajectory deviation from the RTK track was 10cm.
4. Application Scenarios of the DP-filter
The DP-filter is particularly valuable in scenarios requiring high relative position precision and consistent performance. One such application is in agricultural guidance systems. Ensuring a tractor or harvester remains on a consistent path, unaffected by GNSS drifts, can translate to substantial savings and increased operational efficiency for farmers.
Fig. 7 Precision Agriculture
●Reduced GNSS Drifts: Tractors, harvesters, and other agricultural machinery equipped with DP-filter can benefit from reduced GNSS drifts. GNSS drifts, a common challenge, can cause machinery to deviate from its designated path, leading to uneven seeding or wasteful overlaps during crop treatment. By ensuring that these machines adhere to a consistent trajectory, the DP-filter can significantly reduce operational inefficiencies.
●Substantial Savings: Precision agriculture, with the help of tools like the DP-filter, can translate into considerable cost savings for farmers. Fewer resources are wasted, there's reduced wear and tear on machinery due to fewer unnecessary passes, and crops can be managed more effectively, leading to higher yields.
●Optimized Resource Use: When machinery follows the exact path without deviations, there's optimal utilization of water, fertilizers, and other inputs, which not only saves costs but also promotes sustainable farming practices.
5. Conclusion
SinoGNSS K-series OEM boards provide reliable pass-to-pass performance, making it a low-cost GNSS module for applications especially for precision agriculture, as it requires no correction input and internet access.
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本文由翊翊所思转载自ComNav Technology News，原文标题为:DP-filter Smooth Technology: Pass to Pass Solution for Agricultural Guidance Systems，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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司南导航定位模块/转接板选型表
GNSS高精度定位模块是司南导航自主研发的多系统多频点的小尺寸高精度定位模块，支持BDS-3、GPS、BDS-2、GLONASS、Galileo、QZSS 等卫星导航系统的信号跟踪，定位精度高，适用于物联网、智能驾驶、无人机、智能机器人等领域。
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产品型号
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品类
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包装形式
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尺寸（mm）
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特点
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频点
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BDS（信号跟踪）
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GPS（信号跟踪）
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GLO（信号跟踪）
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GAL（信号跟踪）
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QZSS（信号跟踪）
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SPP（定位精度）
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DGPS（定位精度）
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RTK（定位精度）
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伪距精度（cm）
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载波相位精度（mm）
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速度精度（m/s）
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I/O
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冷启动（S）
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热启动（S）
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重捕（S）
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初始化（S）
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IO引脚
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重量（g）
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输入电压（V）
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功耗（w)
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K801
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GNSS高精度定位模块
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真空密封的铝箔放静电袋
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12mm×16mm×2.4mm
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小尺寸定位
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多频
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B1I,B2a
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L1C/A,L5
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G1
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E1,E5a
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L1C/A,L5
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H:≤1.5m V:≤3.0m
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H:≤0.3m V:≤0.5m
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H:≤8+Dx10-6mm V:≤15+Dx10-6mm
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≤10cm
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≤1mm
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≤0.02m/s
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LVCMOS×2,PPS×1,EVENT×1,SPI×1
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＜24S
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＜1S
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＜1S
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＜5S
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LGA 24Pin,1.1mm
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3g
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+3.3V DC
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0.1w
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司南导航（Comnav Technology）K8系列北斗/GNSS高精度定位模块选型指南
目录- 公司介绍 核心技术 K系列模块对比表 高精度模块 数传模块 北斗RDSS短报文通信模块 行业应用 服务与支持 生产与管理
型号- EVK-QD302,CRU,K8-U70,RD02,K803+U70,CDL7,K系列,QD302,K803_EK0405,EVK-K823,U703,EVK-K803,K803_EK0407,K801,K823,W803,GBAS,K802,U70,K827,K803,K823_EK0407,K807,K8系列,K823+U70,K803_EK0610
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描述- 该资料详细介绍了多种5G NR模块的产品规格，包括不同型号的模块如RG650E、RG650V、RM550V-GL等。内容涵盖模块的形态尺寸、工作频率、频段、数据传输速率、接口类型、控制方式、软件支持、认证信息以及推荐应用场景等。资料还提供了不同地区和型号的模块的具体参数和技术细节。
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【应用】司南导航高精度GNSS定位模组K803支持GPS和北斗等多模定位系统，助力割草机路径规划应用
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