NASA Technical Reports Server (NTRS) 20040082065: Development of a Miniature L-band Radiometer for Education Outreach in Remote Sensing

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by  NASA Technical Reports Server (NTRS)

Summary of Research
for
NASA Grant NAG512770
Development of a Miniature L-band Radiometer for
Education Outreach in Remote Sensing
PI: Lyon B. King
Department of Mechanical Engineering
Michigan Technological University
1400 Townsend Drive
Houghton, MI 4993 1
ABSTRACT
Work performed under this grant developed a 1.4-Mhz radiometer for use in soil moisture
remote sensing from space. The resulting instrument was integrated onto HuskySat.
HuskySat is a 30-kg nanosatellite built under sponsorship from the Air Force Research
Laboratory and NASA. This report consists of the interface document for the radiometer
(the Science Payload of HuskySat) as detailed in the vehicle design report.
1. Science Payload
1.1. Subsystem Requirements
No. Requirement status
1 Detect Earth L-band emissions at about -90dbm at 1.4Ghz Procurement
2 Five Channels (1395, 1405, 1415, 1425, 1435MHz) Procurement
3 5 MHZ bandwidth per channel Procurement
4 Measure RF Switch Temperature Prototype
5 Measure Antenna Temperature Prototype
6 Measure RF Amplifier Temperature Prototype
1.2. Technical Description of Subsystem
1.2.1 System Block Diagram I
-
3 x Temperature
Sensor
I
10 bit
Am
L F y
--tt-r
Channel 5
Regulated Timer
Power
To be supplied by
MTU Aerospace
This document was published 05/10/04. No additional changes will be made 5
to it. Check for updates at http://www.enterprise.mtu.edu/aerospace/.
1.2.2 System Block Diagram 2
To NASA
555 Timer
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to it. Check for updates at http://www.enterprise.mtu.edu/aerospace/.
.
1.2.3 Stage I Of Detector Board
12Vdc Vcc
STAGE I -
I
f
O;'k
R12
vl=o v
V2 = 5mV 500k
R3
TF=O *I
PW = .25m
PER= lm
1.2.4 Buflermeference Voltage Stage
'1
Ik
i
tostage2
R8
2
Ilk I
12vDc v2cc
i,
10k
This document was published 05/10/04. No additional changes will be made 7
to it. Check for updates at http://www.enterprise.mtu.edu/aerospace/.
1.2.5 Stage 2 of Detector Board
STAGE 2
*Rg
10k 1Dk
R4
toswitch
irom stage 1 R11
from reference voltage stage
This document was published 05/10/04. No additional changes will be made 8
to it. Check for updates at http://www.enterprise.mtu.edu/aerospace/.
-
1.2.6 Stage 3 of Detector Board
F I . 1 "
STAGE 3
"Nri
32k
15.9k
to stage 4
R15
1.59k
u22*, v4
-T
12vdc
This document was published 05/10/04. No additional changes will be made 9
to it. Check for updates at http://www.enterprise.mtu.edu/aerospace/.
1.2.7 Stage 4 of Detector Board
3
T
68k
W741 7-
R18 e
390k
R20
Y Y V
10k
1.2.8 Timing stage of Detector Board
fromstage2
mu
lkm rd
to stage 3
o= =
I
OUTPUTRESEl
to NASA’s board CONTROL
THRESHOLn
OISCHAFIGE
GND
““fTiming Stage
*Not Finalized
This document was published 05/10/04. No additional changes will be made 10
to it. Check for updates at http://www.enterprise.mtu.edu/aerospace/.
1.2.9 Component Box Conceptual Drawings
Box closed
a
/I
This document was published 05/10/04. No additional changes will be made 11
to it. Check for updates at http://www.enterprke.mtu.edu/aerospace/.
Box open
I I 2.000
This document was published 05/10/04. No additional changes will be made 12
to it. Check for updates at http://www.enterprise.mtu.edu/aerospace/.
1.3. Subsystem Interfa1 ces
1.3.1. Structural Interfaces
I
Description Dim(ecmns)i ons Mass Mass Impact Protrusion?
&!!A Confidence rating
+
Detector RF 5x7~i2n ches 4.5 3 .0833 No
Section
I
Antenna Described 0.5 4
below -20833 Yes
1 Component Box 6.875~5.5~2.10 .5 2 I
I
inches No
-
TOTAL ON SATELLITE SUBSYSTEM MASS = 2.5 kg
DescriDtion of Protrusions
Antenna will be less than 1 inch thick, and will encompass most of the nadir deck surface
1.3.2. Power Interfaces
Description Voltage Current Confidence Continuous?
m (1)
\ .I I \-I
Detector board supply voltage 12 & 5 <41mA 3 Yes
RF board supply voltage 12 <170mA 3 Yes
Itemized descriotion of non-continuous power needs
NIA
This document was published 05/10/04. No additional changes will be made 13
to it. Check for updates at http://www.enterprise.mtu.edu/aerospace/.