Status: In Production
The AT7991, also known as the AGGA-4 developed under ESA contract and the successor of the AGGA-2 chip, is a highly integrated, GNSS base-band processor with 32-bit SPARC V8 embedded general purpose processor and various peripherals.
The core function, the GNSS processing unit, comprises front-end modules able to pre-process digital near-baseband sample streams from four GNSS antennas, as well as 36 single-frequency GNSS correlation channels. Each channel comprises final down-conversion with carrier NCO, as well as a de-spreader unit with a code generator unit, code delay lines and a set of 2×5 correlators. The very flexible code generator al-lows generating a large variety of replica GNSS spreading codes for multiple constellations (Galileo, GPS, Glonass, Beidou). The channels also include carrier and code aiding units, computing parametrizable second order updates to the carrier and code NCO's, which helps reducing the SW loop update rate, hence facilitating the tracking of multiple signals in a high dynamic environment.
The AT7991 is based on the European Space Agency (ESA) SPARC V8 LEON2 fault-tolerant general purpose microprocessor with EEE754 Floating Point Unit. The System-On-Chip (SoC) is completed by a large set of peripherals, namely a 128-point FFT module, a CRC unit, and various communication links e.g. SpaceWire, MIL STD 1553, SPI, UART and GPIOs, some of them have DMA capability.
With its GNSS unit and the general space-oriented SoC architecture, the AT7991 is suit-able for a large variety of navigation-related space applications.
Development tools data is currently unavailable.
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