The GB-GRAM is designed for ground use and low performance aircraft where tight integration with an IMU is not needed such as military SUAV's, e.g., RQ-11B Raven UAS navigates using Rockwell Collins GB-GRAM-M GPS receiver - Military Embedded Systems see also:
What’s Cooking at the Unmanned Aircraft Show in DC? : GPS World provides a list of small GPS units used in UAV.
ABERDEEN PROVING GROUND, Md., 24 June 2014. U.S. Army navigation experts are seeking (W56KGY-14--C008) drastic reductions in the size, weight, and power consumption (SWaP) of embedded GPS satellite navigation modules for use in future wearable and handheld computing, communications, and navigation devices for infantry soldiers.
- General. The Mini-GRAM-M is a form factor that provides at least one serial data interface using the standard interface protocol defined in ICD-GPS-153, as well as AN/PSN-11 TOD output, DS-101 (RS-485 mode).
- Physical. Mini-GRAM-M is not to exceed nominal size 1.5 x 1.5 x 0.5 inches.
- Weight. The total weight shall not exceed 50 grams.
- Input/Output Data. The requirement to provide interfaces is IAW IS-GPS-153D with M-code updates (e.g. MSID).
- Power. The Mini-GRAM-M shall have a power consumption rate at 900 mW (T) and 500 mW (O).
The Mini-GRAM-M GPS module, moreover, must weigh no more than 50 grams, and use no more power than 900 milliwatts in transmission mode, no more than 500 milliwatts in receive mode, and have fewer than 30 pins for I/O. The ultra-small-form-factor Mini GRAM-M GPS module must be compliant to P(Y), M-Code, and C/A (YMCA).
Certifying Military GPS Past, Present & Future - Milt Clary 2007-04-23.pdf
Also see patent Coherent processing using composite codes.
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| Modernized Military v. Current Civil GPS Signals |
The Mini-GRAM-M must be an M-Code GPS receiver that can be embedded into a wearable or handheld device for infantry soldiers, and installed to a circuit card such that it can substitute for an SSI-GB-GRAM in the Type II.
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| SSI-GB-GRAM Envelope |
SSI-GB-GRAM units
Rockwell Collins manufactures Miniature PLGR Engine - Selective Availablity Antispoofing Module; the MPE-S meets the GB-GRAM specification. It can be assumed they will be a primary contender for this. The interface has been customized to provide carrier phase information for precision navigation, as described by Sandia in their SAR radars.Raytheon has the Miniature Airborne GPS Receiver (MAGR) 2000 and MAGR 2000 SAASM.
The MAGR 2000 design is a GPS Receiver Applications Module (GRAM) based open system architecture that is modular in design and incorporates modern electronics. The MAGR 2000 is a form, fit, and function backward compatible replacement of the MAGR, and provides enhancements including improved acquisition and GPS solution performance, all-in-view GPSsatellite tracking and GPS integrity. MAGR 2000 includes a SAASM upgrade.
Small Commercial units
Commercial units aren't SAASM compliant, or handle Y & M code, but are small and cheap.Roadcomm also makes a very small unit: Roadcomm - GPS Mini Preview A.pdf.The RoadComm GPS module is a full function, high performance GPS receiver with embedded antenna designed for OEM system applications. The module will track up to twelve satellites at a time while providing one-second navigation information updates. This module utilizes the latest technology and high level circuit integration to achieve superior performance, small dimension and low power
consumption. RoadComm GPS module connects to host system through standard serial port (RS-
232) thus no longer requires expensive and hard to handle RF cable and connectors. The internal
memory backup allow it to retain data such as satellite orbital parameters,last position, data and time. It is still too big.
Ultimate GPS Module - 66 channel w/10 Hz updates [MTK3339 chipset] ID: 790 - $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Ultimate GPS Module - 66 channel w/10 Hz updates [MTK3339 chipset] ID: 790 - $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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