An Airborne 94 GHz Cloud Radar for NASA ER−2 · 2. 94.0951420 GHz 1 2 Phase Locked Oscillator 1....
Transcript of An Airborne 94 GHz Cloud Radar for NASA ER−2 · 2. 94.0951420 GHz 1 2 Phase Locked Oscillator 1....
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Key Features
Latching Circulator
Driver
1. 15,682.523520 MHz2. 94.0951420 GHz
21
Phase Locked Oscillator
1. 9.976160 MHz @ +10 dBm
Tx Mult. = 9438LO Mult. = 9432
2. 59.856960 MHz @ +23 dBm3. 39.904640 MHz @ +10 dBm
4. 119.713920 MHz @ +10 dBm5. 129.690080 MHz @ +10 dBm
1 2
1. 15,692.499680 MHz
2. 94.15499808 MHz
5
41
3
EIA Over TempModulator Faults
EIAAntenna
ThermistorH V
VH
Mixer &Preamp
Noise Diode
IF Freq. 59.856960 MHz
Timing & Control
Phase Locked Oscillator Multiplier
Ultra QuietOscillator Power Supply Faults
Pulse Timing
Transmitter Power
Supply &HV Power
Modulator
NASA GFSC 94 GHz Cloud Radar System
Data Acqusition System
& Digital Receivers
94.155 GHz
−30 dB
Detector
Computer & VME Bus Based
,- . /0 1 23 4 567 8 9 6 :; 5< ;7 = ; 6 8 6 ;> ?@ <A 8 B6 8 6 ; CD E F =G2 ? B C 9> H 6 E 5 = =7 8 =I =@ <J = 8 6 7 8K < L7 < 7 F H = M , C ,N B 4 O H :P H
6 @ F : FA 8 = 2 OQ RG 9 6 :;S ; 6 T F> L H :S H =G A @ 6 F = E 6 E6 F =@ @ : F = I : = L < T
S @ <A 8 6 7 8J ; =S :J : F6 F : < 7 ED E F =G EU ? B C : E 6 TA @ @ D S < H =; =7 F> J < 4@ 6 ; : G = F =; :S V<J J @ =; ; 6 8 6 ; U W F : ES 6J 6 5@ = < T 8 = F =S F :7 P S @ <A 8 E 6 7 8
J ; =S :J : F6 F : < 7 T; < G F H = P ; <A 7 8 EA ; T6 S = F< A J J =; F; <J < EJ H =; = U W F
: E = EJ =S : 6 @ @ D EA : F = 8 T< ; S :; ;A E S @ <A 8 E FA 8 : = E 5 =S 6A E = < T : F E H :P H
E =7 E : F : I : FD 6 7 8X 7 = EJ 6 F : 6 @ ; = E< @A F : < 7 U Y H =A 7 :Z A =S < G 5 :7 6 F : < 7
< T ? B C L : F H < F H =; E =7 E< ; E < 7 5< 6 ; 8 < 7 N B 4 O> 6 E L =@ @ 6 E F H =
:7 E : FA 8 6 F6 T; < G < F H =; 6 :;S ; 6 T F E 6 7 8 S < 4 @ < S 6 F = 8 G =6 EA ; =G =7 F E
T; < G P ; <A 7 8 4 56 E = 8 6 7 8 EJ 6 S = 4 5 < ;7 = :7 E F;A G =7 F EJ ; < I : 8 = EA 7 4
J ; =S = 8 =7 F = 8 <J J < ; FA 7 : FD F< E FA 8 D F H = ; 6 8 : 6 F : < 7 = [ =S F E < TS @ <A 8 E
< 7 F H = P @ < 56 @ =7 =; P D 5A 8 P = F U Y H = 6 7 6 @ D E : E < T ? B C 8 6 F6 L : @ @
6 @ E< : G J ; < I = <A ; R7 < L@ = 8 P = < 7 6 FG < EJ H =; :S ES 6 F F =; :7 P 6 7 8 6 F 4F =7 A 6 F : < 7 6 F- . /0 1 67 8 J ; < I : 8 = E I 6 @A 6 5@ = ; = T =; =7 S = T< ; F H =
: G J @ =G =7 F6 F : < 7 6 7 8 6 @ P < ; : F H G I 6 @ : 8 6 F : < 7 < T F H = < 7 P < :7 P M , C ,
?@ <A 8 C 6 FJ ; < P ; 6 G > L H :S H L : @ @ A E = 6 - . /0 1 EJ 6 S = 4 5< ;7 =S @ <A 8
; 6 8 6 ; T< ; :S =S @ <A 8 8 = F =S F : < 7 < 7 F H = P @ < 56 @ ES 6 @ = U
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Figure 3. CRS system block diagram.
(a) (b)
(d)(c)
Figure 4. CRS reflectivity and Doppler velocity
Figure 5. Comparison with EDOP and CPL
b. NASA Goddard Space Flight Center, Greenbelt MD 20771
( http://rsd.gsfc.nasa.gov/912/crs )
An Airborne 94 GHz Cloud Radar for NASA ER−2
c. Science Systems & Applications, Inc., Greenbelt MD 20771
a. GEST, Univ. of Maryland Baltimore County, Baltimore, MD 21250
Lihua Li (a) Gerry M. Heymsfield (b) Paul E. Racette (b) Ed Zinker (c) Lin Tian (a)
CRS RF/IF
Figure 2. (a) CRS system operated on the ground. (b) Data system install in ER−2 right wing superpod. (c) ER−2 right
wing tail cone with CRS RF/IF subsystem inside. (d) Bottom view of CRS antenna.
Figure 1. CRS sensitivity estimated from calibrated data.
ER−2 tail cone
CRS data system
CRS antenna
CRS RF/IF
ER−2 tail cone