The Micro GPS Receiver Application Module (MicroGRAM) from BAE Systems delivers geolocation and precise positioning capabilities for military applications such as tactical communications, field computers, and unmanned aircraft. It has a Selective Availability Anti-Spoofing Module (SAASM) at its core, which encapsulates all classified data and signal processing into one tamper-proof module to provide better security. The module is capable of 12-channel continuous satellite tracking and supports L1 and L2 dual-frequency GPS signal reception. It has a time accuracy of 100 ns and a velocity accuracy of 0.04 m/sec steady rate.
The MicroGRAM has two low-power, full-duplex serial data ports with the MPE-S heritage of ICD-GPS-153C. It has an optimized, lightweight, low-power design that uses CMOS logic for efficient message protocol compatible with MPE-S. There is 1 pulse per second input and output timing pulses available for the host application to synchronize time. Even when turned OFF, a precision time source runs continuously when auxiliary power is supplied to allow rapid acquisition of the GPS satellites when the MicroGRAM is turned ON. It requires a DC supply of 3.3 V and consumes less than 0.5 W of power during operation. The MicroGRAM is available in a module that measures 25.40 x 31.75 x 7.00 mm and has an operating temperature range from -40° to +85°C.