User's Manual Part 1

T ECHNICAL D OCUMENTATION P ROTECTING P EOPLE AND A SSETS
®
D ATE : 22 M ARCH 2017 | V ERSION : 1.4
5
R ANGER -X5 R ADAR S YSTEM
T
ROUBLESHOOTING
,
M
AINTENANCE
,
AND
C
ALIBRATION
EEC
®
|
C
OMPANY
P
ROPRIETARY
describes the functions of EDGE.
The transmitter provides a 500W peak RF power pulse (in each channel) with an adjustable pulse
width from 0.2 and 100.0 microseconds (µs), providing excellent weather detection at range in all
modes. The transmitter radiates in staggered Pulse Repetition Frequency (PRF) modes at 3:2,
4:3, or 5:4 ratio allowing dual PRF sampling by the digital signal processor to produce maximum
unambiguous velocities of up to ≥90 meters/second.
The EEC IQ2-IFD Intermediate Frequency Digitizer ingests and digitizes the received radar return
in 16-bit resolution. The receiver design utilizes state-of-the-science components to optimize
detection sensitivity, bandwidth, dynamic range, measurement accuracy, and useful life.
The IQ2-IFD converts the analog receiver IF signals into the digital domain. The IQ2-DSP Digital
Signal Processor receives the digitized Inphase / Quadranture (I/Q) data via the PCI receiver
card. The I/Q data stream is pre-processed and polar rays of meteorological moments are
generated. The ray data is sent via a 1Gbit TCP/IP connection to the IQ2-DSP Signal Processor
for storage and further processing. The IQ2 design optimizes detection sensitivity, bandwidth,
dynamic range, measurement accuracy, and useful life.
The IQ2-DSP is the central data processing point for the radar. The IQ2-DSP is an advanced
scientific computer system utilizing the Linux operating system and employs advanced
scientifically validated algorithms. The standard mode of operation is the proven pulse-pair
method of Doppler processing to produce the standard data moments of Uncorrected Reflectivity
(U), Corrected Reflectivity (ZH), Vertical Reflectivity (ZV), Velocity (V), and Spectrum Width (W).
In addition to the standard base Moments the Ranger-X5 provides the Polarimetric Base
Moments Differential Reflectivity (ZDR), Differential Phase (ΦDP), Specific Differential Phase
(KDP), Correlation Coefficient (ρHV), and Linear Depolarization Ratio (LDR), (where applicable).
The derived moment of rainfall (R) is also included.
General system control utilizes the standard EEC Radar Control Unit (RCU). The RCU is used
to correlate and process BITE information from the various modules and procedures, control the
antenna pedestal operational parameters and perform basic radar control. The RCU integrates
closely with the IQ2 Digital Receiver and IQ2 Digital Signal Processor, communicating by
standard Ethernet Protocol.
The radar system design allows for easy maintenance and has a manually selectable
local/remote mode to permit maintenance personnel to gain local control of the radar system.
Local control is implemented on a Local Control Interface (LCI) Display using a system of menus
and status screens. With the automatic calibration functions and easily accessible system test
points, any necessary system testing, calibration, or repair is easily accomplished with minimum
down time.