The GT-U7 module is a GPS receiver module renowned for its exceptional sensitivity, minimal power consumption, compact size, and superior tracking capabilities. It extends localization coverage even in challenging environments like urban canyons and dense jungles where standard GPS modules falter. This module boasts high precision positioning, low static drift, and effortless integration with 51 single-chip Arduino STM32 routines. Additionally, its USB interface allows seamless connectivity to a computer, eliminating the need for additional serial modules with IPX interfaces. Notably, it shares the NEO-6M chip with identical codes and pin configurations, simplifying integration for users.

Features:

• High Sensitivity: The GT-U7 module is equipped with high sensitivity, making it exceptionally adept at receiving GPS signals even in challenging environments.
• Low Power Consumption: This module is designed for efficiency, consuming minimal power, and ensuring extended operation without draining your power source.
• Miniaturization: With its compact size and the option for straight or patch installation, it offers flexibility for different applications and installations.
• High Tracking Sensitivity: The GT-U7 module's high tracking sensitivity significantly expands its localization coverage, making it capable of precise positioning even in narrow urban skies or dense jungle environments where standard GPS modules may struggle.
• Compatibility with 51 Single-Chip Arduino STM32 Routines: It seamlessly integrates with 51 single-chip Arduino STM32 routines, simplifying the development process for various projects.
• USB Interface: Featuring a USB interface, this module allows direct connectivity to a computer using a mobile phone data cable, enabling real-time positioning data visualization on your computer screen.
• No Need for Additional Serial Modules: Unlike some GPS modules, the GT-U7 doesn't require additional serial modules with IPX interfaces. It can be directly connected to a computer via USB, functioning as a host computer serial port.
• Shared NEO-6M Chip: It employs the same NEO-6M chip, ensuring compatibility with existing codes and wiring, with minor adjustments for pin configurations. 

 Principle of Work:

Internal operation :

1. GPS Antenna: The module has a built-in or external GPS antenna to receive signals from GPS satellites. These signals include precise timing information and data about the satellite's position.
2. RF Front-End: The received GPS signals are passed through a radio-frequency (RF) front-end that amplifies and filters the signals. This step is crucial to enhance sensitivity and selectivity.
3. Signal Processing: The module's internal processor then decodes the incoming GPS signals. It extracts information about the satellite constellation, including the position of each satellite and the time of signal transmission.
4. Calculations: Using the information from multiple satellites, the module calculates its precise position on Earth through a process called trilateration. This involves determining the distance from the module to each satellite by measuring the time it takes for the signals to travel.
5. Data Output: Once the position is calculated, the module can output this data in various formats, including the NMEA (National Marine Electronics Association) format, which is a common standard for GPS data.

Interaction with MCU (Microcontroller Unit):

1. Serial Communication: The GT-U7 module typically communicates with the MCU through UART (Universal Asynchronous Receiver-Transmitter) serial communication. It has two pins, TXD (Transmit Data) and RXD (Receive Data), that connect to the corresponding UART pins on the MCU.
2. Baud Rate Configuration: The module operates at a default baud rate of 9600, but this can be modified if needed. The MCU needs to be configured to communicate at the same baud rate to ensure proper data exchange.
3. Data Parsing: The MCU receives NMEA-formatted GPS data from the module. It needs to parse this data to extract relevant information, such as latitude, longitude, altitude, and time.
4. Custom Coding: With the extracted GPS data, the MCU can execute custom code to perform various tasks. For example, it can display the location on an LCD screen, log the data to an SD card, or transmit it wirelessly.
5. Integration with Other Sensors: The MCU can also integrate GPS data with other sensors or modules to create more complex applications. For instance, it can combine GPS data with temperature or humidity readings for environmental monitoring.
6. Power Supply: The GT-U7 module typically operates within a voltage range of 3.6V to 5V. The MCU should provide a stable power supply within this range to ensure reliable operation.

Technical Details: 

• Size: 27.6x26.6 mm
• Working Voltage: 3.6V-5V (or direct USB power supply)
• Work Baud Rate: 9600 (self-modification)
• Antenna Interface: IPEX (Default distribution of active antenna)
• Onboard Rechargeable Button Cell
• Onboard E2PROM for parameter data storage
• NEMA Output Format Compatibility with NEO-6M