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