Transcript Preliminary Design Review Presentation: System Design

System Design Overview
HCR Wing-Mounted Pod
Wing
Pylon
Electronics
Pod
Antenna Beam
HCR Characteristics
•
Scanning, airborne, W-band Doppler radar
for HIAPER mid-altitude jet (51kft ceiling)
– Radar electronics housed in un-pressurized
wing-mounted pod, with data archiving and
real-time display inside aircraft
PARAMETER
Frequency
94.0 GHz
Polarization
H
Peak Transmit Power
1.5 kW
Receiver Noise Figure
9.4 dB
Antenna Diameter
0.38 m
Antenna Gain
48 dBi
3 dB Beamwidth
0.6°
PRF
1 – 20 kHz
Range Resolution
30 – 300 m
System Overview
Pod Data
System
Cabin Data
System
Antenna & Pedestal
R/T’s
W Band
Exciter
Control
H Receiver
OMT
Waveform
Generator
Display
Archive
Signal
Processor
EIKA
IF Digitizer
Ethernet
CPU
V Receiver
IF Digitizer
IRIG-B I/F
Arinc429 I/F
10?
Antenna
Control
Waveform
Generator
IF Digitizer
Ka Band
Exciter
EIKA
IF Digitizer
H Receiver
V Receiver
Phase A Equipment
Phase B Equipment
Phase C Equipment
HIAPER Cloud Radar System Drawing
OMT
Environmental Factors
•
Temperature: -65 C to + 50 C
– Cooling: “ram air” fed liquid to air heat exchanger can be “plumbed” for use in
cold plates or forced air cooling
– Heating: conduction, natural and forced convection via contact heaters
– Identify temperature sensitive subsystems/components and periodically log
temperatures
– Regulate temperature (heating and/or cooling) of subsystems/components to
keep electronics within operating limits and prevent condensation due to cold
“soaking”
– Control temperature of “RF front end” +/- TBD °C
•
Pressure: 1.6 psi to 14.7 psi
– Construct pressure vessel to contain transmitter HV power supply, modulator,
and EIK. Include IF portion of Receiver for packaging efficiency
– Design waveguide/feed pressurization system to handle transmitter peak power
•
Mechanical Stresses
– Shock: 6 g, 11 ms duration – per RTCA/DO-160D
– Vibration: 8 g (rms), 10 Hz to 2000 Hz – per RTCA/DO-160D
– Design equipment mounting structures to handle anticipated stresses, including
emergency landing loads
– Use vibration isolators?
Pod Based Radar System Layout
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D IST A N C E B E T W E E N
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SE C T IO N B - B
RX Front End
2 0 .0
Rotating Reflector
Lens
Antenna
SP L IT L IN E
4 9 .7
Pressure Vessel:
EIKA, Modulator,
Exciter & IF RX
Data
System
D R O P - O U T SE C T IO N
SP L IT L IN E
4 8 .3
6 0 .5
1 5 8 .5
Pod:
Length = 158.5”
Diameter = 20”
Payload = 800 lbs.
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1
Scanning
•
Desirable to steer the beam
towards interesting features
– Rotating reflector plate will allow
the system to scan from nadir to
zenith
• Easy to implement, no rotary joint
required
• Changes the polarization vector
of the transmitted signal