Andrew Network Solutions Group WLS2NS Manuale Utente
Geometrix
®
Wireless Location System
1
Andrew Corporation Proprietary
Chapter 1 Equipment Description
This chapter presents a technical description of the WLS equipment.
1.1 WLS Technical Description
The WLS is a digital receiver unit that makes measurements on a mobile uplink RF signal in order
to aid in a location computation. Multiple WLS units work together as coordinated by the
Geolocation Control System (GCS) to locate a mobile.
to aid in a location computation. Multiple WLS units work together as coordinated by the
Geolocation Control System (GCS) to locate a mobile.
WLS units are available with multiple options from four models: 2-channel, 4-channel, 4-channel
with AOA, and AOA ONLY. Two channel WLS’s are used for 2-antenna input Time Difference of
Arrival (TDOA) processing. This is the most common unit installed. Four channel units are used
for 4-antenna input TDOA processing as well as Angle of Arrival (AOA) processing. AOA ONLY
units are used for only areas not using TDOA processing. All models are available with +24v and
–48v dc power options, a CDMA processing capability option, and a GSM processing capability
option.
with AOA, and AOA ONLY. Two channel WLS’s are used for 2-antenna input Time Difference of
Arrival (TDOA) processing. This is the most common unit installed. Four channel units are used
for 4-antenna input TDOA processing as well as Angle of Arrival (AOA) processing. AOA ONLY
units are used for only areas not using TDOA processing. All models are available with +24v and
–48v dc power options, a CDMA processing capability option, and a GSM processing capability
option.
WLS model numbers are designated as follows:
WLS4 A-24-MCGP
Model Options:
2 = 2 Channel; 4 = 4 Channel
Mezzanine Options:
A = No Mezzanine Support, Blank = Mezzanine Support
DC Options:
24 = 24v; 48 = -48v
CDMA Options:
M = CDMA Mezzanine Installed; Blank = No CDMA
AOA Options:
C = AOA Calibration Source Installed; Blank = No AOA
GSM Options:
G = GSM Module Installed; Blank = No GSM
Band Options:
P = PCS Band Only; Blank = Dual-band
The WLS is typically installed in an existing base station. It mounts in a base station 19” or 23”
rack, and connects to the base station power, receive antenna, CSU/DSU communications and
alarm systems. A GPS antenna is required for WLS time synchronization. AOA WLS’s require
rack, and connects to the base station power, receive antenna, CSU/DSU communications and
alarm systems. A GPS antenna is required for WLS time synchronization. AOA WLS’s require