Functional description

0281-EX-ST-2006 Text Documents

Advanced Navigation & Positioning Corp.

2006-04-25ELS_75723

SECTION 1: INTRODUCTION

1.1 Purpose
A sub set of the Transportable Transponder Landing System (model Rhino III), developed by
ANPC under NAVAIR contract with the U.S. Marines, is being deployed to Truckee-Tahoe
Airport for system evaluation. The deployment will only be utilizing the surveillance
functionality of the equipment. This project is an initial step in the joint TSAS project between
ANPC and the FAA. The Special Transmit Authority is requested to support this activity
occurring summer 2006. This document elaborates on system functions relevant to the STA
application.

1.2 Aircraft Surveillance
The Rhino III uses SSR frequencies to accomplish 360º surveillance around the installation. The
current implementation uses a sectorized interrogator of six slightly overlapping antenna beams.
One sector is interrogated at a time. The nominal PRF is 17 Hz. Mode A and Mode C
interrogations are interlaced. If the processing software detects overlapping transponder replies,
it will proceed with a six-level whisper/shout sequence in that sector. The whisper/shout
interrogations are performed at 68 Hz. The maximum effective interrogation rate of an aircraft
in the surveillance volume is 3.2 Hz. An omni-directional P2 pulse is emitted to suppress replies
from the back and side lobes of the interrogator antenna.

1.3 Regional Considerations
The facility elevation will be 5900 feet and surrounded by higher terrain. The site is bounded to
the east by 10,000+ foot mountains within 10 NM of the airport. There are 8000+ peaks 5 NM
south and 8 NM west of the airport

1.4

Document Created: 2006-04-25 12:45:04
Document Modified: 2006-04-25 12:45:04

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