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The centerpiece of the Quad-band GNSS RTK breakout board, is the [LG290P GNSS module](./assets/component_documentation/Quectel_LG290P(03)_Hardware_Design_V1.0.pdf) from [Quectel](https://www.quectel.com/). The LG290P is a low-power, multi-band, multi-constellation GNSS receiver capable of delivering centimeter-level precision at high update rates. The built-in NIC anti-jamming unit provides professional-grade interference signal detection and elimination algorithms, which effectively mitigate against multiple narrow-band interference sources and significantly improves the signal reception performance in complex electromagnetic environments. With its performance advantages of high-precision and power consumption, this board is an ideal choice for high-precision navigation applications, such as intelligent robots, UAVs, precision agriculture, mining, surveying, and autonomous navigation.
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The centerpiece of the Quad-band GNSS RTK breakout board, is the [LG290P GNSS module](./assets/component_documentation/quectel_lg290p03_hardware_design_v1-1.pdf) from [Quectel](https://www.quectel.com/). The LG290P is a low-power, multi-band, multi-constellation GNSS receiver capable of delivering centimeter-level precision at high update rates. The built-in NIC anti-jamming unit provides professional-grade interference signal detection and elimination algorithms, which effectively mitigate against multiple narrow-band interference sources and significantly improves the signal reception performance in complex electromagnetic environments. With its performance advantages of high-precision and power consumption, this board is an ideal choice for high-precision navigation applications, such as intelligent robots, UAVs, precision agriculture, mining, surveying, and autonomous navigation.
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<divclass="grid"markdown>
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!!! info
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For a comparison of the frequency bands supported by the LG290P GNSS modules, refer to sections **1.2**, **1.5**, and **1.6** of the [hardware design manual](./assets/component_documentation/Quectel_LG290P(03)_Hardware_Design_V1.0.pdf).
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For a comparison of the frequency bands supported by the LG290P GNSS modules, refer to sections **1.2**, **1.5**, and **1.6** of the [hardware design manual](./assets/component_documentation/quectel_lg290p03_hardware_design_v1-1.pdf).
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??? tip "What are Frequency Bands?"
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A [frequency band](https://en.wikipedia.org/wiki/Frequency_band) is a section of the [electromagnetic spectrum](https://en.wikipedia.org/wiki/Electromagnetic_spectrum), usually denoted by the range of its upper and lower limits. In the [radio spectrum](https://en.wikipedia.org/wiki/Radio_spectrum), these frequency bands are usually regulated by region, often through a government entity. This regulation prevents the interference of RF communication; and often includes major penalties for any interference with critical infrastructure systems and emergency services.
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</figure>
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=== "NMEA"
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A full list of compatible `NMEA 0183` v4.11 messages, is provided in section **2.2. Standard Messages** of the [GNSS Protocol Specification](./assets/component_documentation/Quectel_LG290P_GNSS_Protocol_Specification_v1-0.pdf) manual. This protocol is used for outputting GNSS data, as detailed by the [National Marine Electronics Association](https://www.nmea.org/) organization.
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A full list of compatible `NMEA 0183` v4.11 messages, is provided in section **2.2. Standard Messages** of the [GNSS Protocol Specification](./assets/component_documentation/quectel_lg290p03_gnss_protocol_specification_v1-0.pdf) manual. This protocol is used for outputting GNSS data, as detailed by the [National Marine Electronics Association](https://www.nmea.org/) organization.
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??? abstract "List of Standard NMEA Messages"
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<center>
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=== "PQTM"
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A full list of PQTM messages (proprietary NMEA messages defined by Quectel) supported by LG290P, is provided in section **2.3. PQTM Messages** of the [GNSS Protocol Specification](./assets/component_documentation/Quectel_LG290P_GNSS_Protocol_Specification_v1-0.pdf) manual. This protocol is used to configure or read the settings for the LG290P GNSS module.
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A full list of PQTM messages (proprietary NMEA messages defined by Quectel) supported by LG290P, is provided in section **2.3. PQTM Messages** of the [GNSS Protocol Specification](./assets/component_documentation/quectel_lg290p03_gnss_protocol_specification_v1-0.pdf) manual. This protocol is used to configure or read the settings for the LG290P GNSS module.
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??? abstract "List of Proprietary Quectel Messages"
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<center>
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=== "RTCM"
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A full list of compatible `RTCM v3` messages, is provided in section **3. RTCM Protocol** of the [GNSS Protocol Specification](./assets/component_documentation/Quectel_LG290P_GNSS_Protocol_Specification_v1-0.pdf) manual. This protocol is used for transferring GNSS raw measurement data, as detailed by the [Radio Technical Commission for Maritime Services](https://www.rtcm.org/) organization.
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A full list of compatible `RTCM v3` messages, is provided in section **3. RTCM Protocol** of the [GNSS Protocol Specification](./assets/component_documentation/quectel_lg290p03_gnss_protocol_specification_v1-0.pdf) manual. This protocol is used for transferring GNSS raw measurement data, as detailed by the [Radio Technical Commission for Maritime Services](https://www.rtcm.org/) organization.
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??? abstract "List of Supported RTCMv3 *(MSM)* Messages"
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Below, are excerpts for a few of the PQTM messages from the [GNSS Protocol Specification](./assets/component_documentation/Quectel_LG290P_GNSS_Protocol_Specification_v1-0.pdf) manual. Users will find these useful for configuring their LG290P GNSS module as an RTK base station or rover.
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Below, are excerpts for a few of the PQTM messages from the [GNSS Protocol Specification](./assets/component_documentation/quectel_lg290p03_gnss_protocol_specification_v1-0.pdf) manual. Users will find these useful for configuring their LG290P GNSS module as an RTK base station or rover.
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???+ info "Documentation"
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A full list of PQTM messages (proprietary NMEA messages defined by Quectel) supported by LG290P, is provided in section **2.3. PQTM Messages** of the [GNSS Protocol Specification](./assets/component_documentation/Quectel_LG290P_GNSS_Protocol_Specification_v1-0.pdf) manual. This protocol is used to configure or read the settings for the LG290P GNSS module.
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A full list of PQTM messages (proprietary NMEA messages defined by Quectel) supported by LG290P, is provided in section **2.3. PQTM Messages** of the [GNSS Protocol Specification](./assets/component_documentation/quectel_lg290p03_gnss_protocol_specification_v1-0.pdf) manual. This protocol is used to configure or read the settings for the LG290P GNSS module.
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??? abstract "List of Proprietary Quectel Messages"
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