GRNav: Geospatial Reckoning Navigation Module
The GRNav module is available as a standalone module with a serial protocol to communicate with existing vehicle subsystems, or as a custom integration into the customer’s vehicle system.
BIDAR™ (BIdirectional Detection And Ranging)
GRNav has an onboard proprietary BIDAR™ transceiver to locate and communicate with nearby GRGuides. The transceiver can be configured to any of several frequencies. Available configurations:
- Short-Range — Up to 25m range with 1mm positioning accuracy
- Mid-Range — Up to 500m range with 1cm positioning accuracy
- Long-Range — Up to 25km range with 1m positioning accuracy
- Custom — Contact us for specialized configurations
The range refers to the influence radius of each GRGuide, not the total range of the vehicle. As a vehicle travels, it searches for nearby GRGuides — much like a driver watching for the next traffic light. GRGuides can be distributed over an arbitrarily large path.
GRNav Vehicle & Vessel Interface
The GRNav module interacts with nearby GRGuides and generates navigation instructions for the vehicle. Integration can be configured to directly control the vehicle, or to act as suggestions to a human pilot. Vehicle controls consist of just two instruction types:
- Steering — A suggested steering angle and direction (e.g., “turn right 12°”)
- Acceleration — Deceleration / stop commands only; GRNav never tries to increase speed
GRNav Protocol
GRNav communicates with vehicle subsystems using a serial protocol and can be configured to use existing legacy protocols as needed for integration into mature vehicle architectures.
GRGuide: Geospatial Reckoning Beacon Module
A GRGuide is a compact transceiver that implements the BIDAR™ protocol. Minimal power requirements, multiple range versions, and full configurability make it practical to deploy as a complete guidance system.
Short-Range GRGuide
Optimized for low power consumption and highly accurate positioning. Ideal for warehouses or small outdoor areas — deploy ad-hoc with a small DC power source. Battery life can reach two years under non-continuous use.
Mid-Range GRGuide
Recognized at ranges up to 500 meters with 0.5m positioning accuracy. Suited for marine channel navigation, buoy guidance, container loading, and industrial campus navigation.
Long-Range GRGuide
25 km range for applications where the vehicle travels at high speed (jet aircraft) or has slow response times (container ships). Designed for wide-area maritime and aviation applications.