Goouuu Tech GT-U7 GPS Modules
- June 8, 2024
- Goouuu
Table of Contents
GT-U7
GPS Modules
-
Functional description
1.1 Overview
The GT-U7 module series is a family of stand-alone GPS receivers featuring the high-performance u-blox 6 positioning engine. These flexible and cost- effective receivers offer numerous connectivity options in a miniature 16 x 12.2 x 2.4 mm package. Their compact architecture and power and memory options make GT-U7 modules ideal for battery-operated mobile devices with very strict cost and space constraints. The 50-channel u-blox 6 positioning engine boasts a Time-To-First-Fix (TTFF) of under 1 second. The dedicated acquisition engine, with 2 million correlators, is capable of massive parallel time/frequency space searches, enabling it to find satellites instantly. Innovative design and technology suppresses jamming sources and mitigates multipath effects, giving GT-U7 GPS receivers excellent navigation performance even in the most challenging environments.
1.2 GPS performance
1.3 Block diagram
1.4 Assisted GPS (A-GPS)
Supply of aiding information like ephemeris, almanac, rough last position and time and satellite status and an optional time synchronization signal will reduce time to first fix significantly and improve the acquisition sensitivity. All GT-U7 modules support the u-blox AssistNow Online and AssistNow Offline A-GPS services11 and are OMA SUPL compliant.
1.5 AssistNow Autonomous
AssistNow Autonomous provides functionality similar to Assisted-GPS without the need for a host or external network connection. Based on previously broadcast satellite ephemeris data downloaded to and stored by the GPS receiver, AssistNow Autonomous automatically generates accurate satellite orbital data (“AssistNow Autonomous data”) that is usable for future GPS position fixes. AssistNow Autonomous data is reliable for up to 3 days after initial capture.
1.6 Protocols and interfaces
Protocol Type
NMEA Input/output, ASCII, 0183, 2.3 (compatible to 3.0) UBX Input/output, binary, u-blox proprietary RTCM Input, 2.3
1.6.1 UART
GT-U7 modules include one configurable UART interface for serial communication (for information about configuration see section 1.15).
1.6.2 USB
GT-U7 modules provide a USB version 2.0 FS (Full Speed, 12Mbit/s) interface as an alternative to the UART. The pull-up resistor on USB_DP is integrated to signal a full-speed device to the host. The VDDUSB pin supplies the USB interface. u-blox provides a Microsoft® certified USB driver for Windows XP, Windows Vista and Windows 7 operating systems.
1.6.3 Serial Peripheral Interface (SPI)
The SPI interface allows for the connection of external devices with a serial interface, e.g. serial flash to save configuration and AssistNow Offline A-GPS data or to interface to a host CPU. The interface can be operated in master or slave mode. In master mode, one chip select signal is available to select external slaves. In slave mode a single chip select signal enables communication with the host.
1.7 Antenna
1.8 Power Management
u-blox receivers support different power modes. These modes represent strategies of how to control the acquisition and tracking engines in order to achieve either the best possible performance or good performance with reduced power consumption.
1.9 Maximum Performance Mode
During a Cold start, a receiver in Maximum Performance Mode continuously deploys the acquisition engine to search for all satellites. Once the receiver has a position fix (or if pre-positioning information is available), the acquisition engine continues to be used to search for all visible satellites that are not being tracked.
1.10 Eco Mode
During a Cold start, a receiver in Eco Mode works exactly as in Maximum Performance Mode. Once a position can be calculated and a sufficient number of satellites are being tracked, the acquisition engine is powered off resulting in significant power savings. The tracking engine continuously tracks acquired satellites and acquires other available or emerging satellites.
1.11 Power Save Mode
Power Save Mode (PSM) allows a reduction in system power consumption by selectively switching parts of the receiver on and off -
**Pin Definition
2.1 Pin assignment
**
- **Electrical specifications
3.1 Absolute maximum ratings
source impedance = 50 , continuous wave
3.2 Operating conditions
3.3 SPI timing diagrams
In order to avoid a faulty usage of the SPI, the user needs to comply with
certain timing conditions. The following signals need to be considered for
timing constraints: 3.4 Timing recommendations
**
- Mechanical specifications
Goouuu Tech GT-U7 GPS Modules – Download [optimized]
Goouuu Tech GT-U7 GPS Modules – Download
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