# Presentation: 226782

## GPS Outfitters

- GPS Reradiation Presentation
- IRAC 10/28/2005

## GPS Outfitters

- Exclusive Authorized Distributor for San Jose Navigation Reradiation Products
- SJNs’ appointed agent for all reradiation and regulation matters in the US
- Supplier of aftermarket GPS Accessories

## RA46 Vortech Overview

- 3 part, low power L-1 GPS reradiator
- External amplified antenna
- Power/RF Cable
- Sealed, non-adjustableRF Transmitter

## RA46 Vortech Application

- Designed to provide GPS signals in environments where a clear view of the sky is not possible
- Low Power Level does not compete with free atmosphere GPS signal
- Designed for maximum effective range of 5 meters

## RA46 Vortech GPS Re-Radiator RF Parameters

- Re-radiator ant. 3m from horn ant. (EMCO  3115, G = 26 dB), cable connected (1.9 dB loss) to HP 8546A EMI receiver (50 Ohm input impedance).
- Signal: 1.1 dBμV, or -105.9 dBm input to EMI receiver
- Accounting horn gain, cable loss & 3m path attenuation
- RA46 EIRP = -109.5 dBm
**RA46 power at 30 m = -150 dBm, 10 dB below new regulation limits **

## RA46 is an Ultra Low Power Device

- RA46 EIRP of -109.5 dBm is equivalent to 0.01 nano-milli-Watts.
- This power level is a factor of 100 billion below the 1 milli-Watt power level where transmitters are candidates for non-licensed applications.
- RA46 typically operates within less than one meter of the GPS receiver being assisted
- RA46 is a non-threat to any nearby GPS receivers or other communications devices

## RA46 Very Low Power

- Section 15.205 states
- Spurious  Emissions Only in 1.44 to 1.62 GHz spectrum (GPS L1 region) at 500 μV/m at 3 m equivalent to -71 dBm.
- RA46 EIRP of -109.5 dBm is **39 dB below** the spurious emissions  limit

## Worst-Case Interference Issues

- Sealed, non-adjustable transmitter with limited range and power level below acceptable spurious emission limits
- Potential for multipath confusion at GPS receiver, most have algorithms to correct
- Result would likely only be accuracy error of less than 30 feet

## Safety Benefits

- Allows GPS equipment to stay locked on inside a vehicle, protecting military users inside APCs, Tanks, and Humvees
- Prevents vehicles from getting lost due to poor GPS performance in urban areas or lack of sky view
- Improves response time to emergency situations and keeps tracking information current and correct

## Commerce Benefits

- Allows users to use existing GPS equipment without external antenna capability instead of more expensive models
- Cost efficient alternative to ‘smart antenna’ solutions in PC applications
- Allows use of existing GPS board already purchased

## Convenience Benefits	

- Temporary or fixed installation
- Wireless transmission to GPS device
- No Power or RF cabling to existing GPS device allows quick removal and continuous satellite lock when leaving vehicle
- No need to add or configure USB or Serial GPS hardware in PC applications

## Regulatory Issues

- RA 46 Vortech power level is low enough to fall within current guidelines, but does operate on restricted frequency
- Request an Equipment Waiver based on tested and approved power level to preserve existing restriction guidelines and limit/control usage to government and commercial entities
- Registration requirement/experimental license for all purchasers to contact users in the future

## Equipment Waiver

- GPS Outfitters will submit samples to FCC or Certified Test Lab to confirm power and bandwidth specifications
- GPS Outfitters will limit sales to military, government, and commercial customers and restrict sales to general public and maintain customer database
- Waiver is revocable upon determination of harmful interference from future RF devices