CR-189378

Report 10448Final ResubmittalNovember 1994

I ENCORP

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Earth Observing System (EOS)/Advanced Microwave Sounding Unit-A (AMSU-A)Instrument Logic Diagrams

Contract No: NAS 5-32314CDRL: 302

Submitted to:

National Aeronautics and Space AdministrationGoddard Space Flight CenterGreenbelt, Maryland 20771

Submitted by:

Aerojet1100 West Hollyvale StreetAzusa, California 91702

Aerojet

https://ntrs.nasa.gov/search.jsp?R=19950007220 2020-04-03T12:37:34+00:00Z

Report 10448Final ResubmittalNovember 1994

Earth Observing System (EOS)/Advanced Microwave Sounding Unit-A (AMSU-A)

Instrument Logic Diagrams

Contract No: NAS 5-32314

CDRL: 302

Submitted to:

National Aeronautics and Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

Submitted by:

Aerojet1100 West Hollyvale Street

Azusa, California 91702

Report 10448November 1994

EOS/AMSU-A-CDRL INSTRUMENT LOGIC DIAGRAMS

1. Scope

1.1 Description

This document consists of a set of block diagrams and internal logic diagrams that

show the signal inputs, outputs, and internal signal flow.

2. Description

2.1 Functional Block Diagrams, Figures 1 and 2, show the signal flow in the AMSU-A

instrument and the general interface to the spacecraft. Each major subfunctition is described in the

following paragraphs. Passive analog circuits include sensors on the receiver shelves, warm loads,and drive motors.

2.2 Signal Processor and Power Distribution Block Diagrams, Figures 3 and 4, providethe next level of detail and show the division of functions in the analog processor. Radiometric data

processed in the analog processor into multiplexed parallel digital form and delivered to the digital

processor where they are packetized and formatted in preparation for transmission via the MIL-STD-1553 interface. Temperature and other analog engineering data are submultiplexed and join

the data stream at the analog multiplexer/digitizer. Digital engineering data are fed directly to the

digital processor after appropriate conditioning. The digital processor generates all necessary timing

pulses and data for the instrument, including clock pulses to the DC/DC converter.

2.3 The Analog Processor Block Diagram, Figure 6, provides a more detailed diagram of

signal flow and functions within the analog processor. For the purposes of this diagram, nodifferentiation is made between the A1 and A2 instrument modules. Radiometric signals from the

receiver are detected in the Detector/Preamplifier assembly where they generate a low-frequency

output, typically between 0 and 2.0 volts. There are 13 channels in the A1 module and 2 in the A2.The detected signals are integrated and the integrated values fed to the multiplexer where they are

sampled and placed in a serial stream. After each sample period, the integrator is reset by the

"dump" pulse. The serial analog data stream is digitized in the A/D converter into a 15-bit parallel

output that enters the instrument local computer bus via an I/O port on the Timing and Control

circuit card assembly (CCA). All multiplexer address and other timing data are generated by the

Timing and Control CCA.

Temperature data take two forms; high precision from the warmloads and medium

precisionfrom diagnostic sensors spread throughout the instrument. These data are submultiplexed

into three groups in conjunction with already multiplexed engineering data and two reference

voltages, then delivered to three inputs ofthe radiometric data multiplexer described above. There

they are processed in the same way as the radiometric data and join the data stream to the digital

processor.

Engineering data arrive in both analog and digital form at the multiplexer/relay

CCA. Digital data enter the local computer bus directly via an input/output (I/O) port, while the

analog data are voltage normalized and multiplexed for transmission to the temperature sensor

analog mux described above. The Mux/Relay CCA carries some power switching relays and theirstatus is also transmitted to the digital processor via the I/O port for inclusion into the engineeringdata stream.

2.4 Digital Processor Block and Logic Diagrams, Figures 6 through 12, show the

configuration of the EOS/AMSU-A digital processor. The processor is controlled by the central

Report10448November 1994

The Timing and Control CCA generates all timing and address signals for use by the instrument.

The Scan Control Interface CCA sends position commands to and receives position data from the

antenna drive subsystem. The Mux/Relay CCA has already been described under the AnalogProcessor section above and is included because it serves both digital and analog functions. The

MIL-STD-1553 interface receives commands and timing data from the spacecraft and transmits

science, engineering, and diagnostic data.

2_5 Scan Drive Electronics Block Diagrams, Figures 13 and 14, show the signal paths

from the Digital Processor through the Scan Drive Subsystem. Antenna position data are stored inthe PROM in the Digital Processor. These data are strobed into the Drive Electronics where they are

compared with the current antenna position in a digital subtractor. The 14-bit digital error signal is

converted into analog form and processed through a triple notch filter before being supplied to themotor drivers.

Position information isobtained using a precisionresolver. The resolver isfed a 1600

Hz signal which is coupled into two coilsmounted in quadrature. The relative amplitude of the

signal in each coilis dependent upon the angular position of the resolver shaft. The two output

signals are converted into digitalform using a hybrid converter. The position signals are used to

generate an error signal as described above and are also fed back to the Digital Processor for

inclusionin the Science and Engineering data streams.

Optical isolatorsare used in allsignalpaths between the Digital Processor and Scan

Drive Subsystem to maintain power bus isolation. The Converter Busy line requires transformer

isolationbecause ofitsfast risetime.

Cold Coerr.c

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Scene / W_L'rn-=,'.ad

R_dil'_c./& Calibration

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- W_'mlo _

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- Receiver S_'_h, es

Bus Redundancy Relay

GSE Commands

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C& TBus

interface

Report 10448November 1994

A1-2 AntennaTem

S_nd Proc_eor

Poww

Voltage, Current. &

A1-1 Ricvr Heater Power

A1-1 Scan Ofive Electror_:l Power

A1-1 Recekler _ Power

A1-1 Anterma Scan Drive Motor Power (NPB)

A1-2 Reco_vw Heato¢ Poww

A1-2 Rece/v_ Powe_

A1-2 Scan Drive Elec'aor_o Poww

At-2 Anlenna .Scan Drive Motor Power (NPB)

DC/DC

l:_dundmrt Powe_ Buses

C_iet Power Bus (OP9)

A1 Power

Dislnbu_on Surveall Heater Power

A_

Noly Power Bus (NPB)

A1-2 Antsrw_ Pos_Don Commands

A1-2 Anto_t Resolvw Data

BLOC_ DIAGRAM

FIGURE 1 AMSU-A1 FUNCTIONAL BLOCK DIAGRAM

3

iEncode Position

Positio, Command +28 Vdc

Out In

+5 Vclc,:1:15 Vdc

Cold Cosmic

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Radiance Source

"-_-- -]/ Warm-Load

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FIGURE 2 AM_L_-AI FUNCTIONAL BLO

Report 10448November 1994

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- Warmload

- Scan Drive Motor I- Receiver Shelf

=',Bus Redundancy I

1Redundant Power Buses I

Quiet Power Bus (QPB) 1

1Survival Heater Power Bus

1PowerBusNPL.N__

II

K DIAGRAM

FIGURE 2 AMSU-A1 FUNCTIONAL BLOCK DIAGRAM

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NFSD 89-0 (June 30, 1989) FORMS 53-55

NASANational Aeronautics andSpace Administration

1. Report No.

10448

4. Title and Subtitle

Report Documentation Page

2. Government Accession No.

Earth Observing System/Advanced MicrowaveSounding Unit -A (AMSU-A), Instrument LogicDiagrams

7. Author(s)

Mark Pluck

3. Racipient's Catalog No.

S. Report Date

November 1994

S. Performing Organization Code

B. Performing Or_l_bon Report No.|_r-r-,irtM

November 1994

10. Work Unit No.

11. Contract or Grant No.

NAS 5-32314

13. Type of Repod and Period Covered

Final

9. Performing Organization Name and Addrm

Aerojet1100 W. HollyvaleAzusa, CA 91702

12. Sponsoring Agency Name and Address

NASA

Goddard Space Flight CenterGreenbelt, Maryland 20771

14. Sponsoring Agency Code

15. Supplementary Notes

16. ABSTRACT (Maximum 200 words)

This document consists of a set of block diagrams and internal logic diagrams that show

the signal inputs, outputs, and internal signal flow.

17. Key Words (Suggested by Author(s))

EOSMicrowave System

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Unclassified Unclassified

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Earth Observing System/Advanced Microwave SoundingUnit-A (EOS/AMSU-A), Monthly Report Instrument LogicDiaarams NAS 5-32314

S. AUTHOR(S)

Mark Pluck

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Asrojet1100 W. HollyvaleAzusa, CA 91702

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NASAGoddard Space Flight CenterGreenbelt, Maryland 20771

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Report 10448CDRL 302November 1994

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This document consists of a set of block diagrams and internal logic diagrams thatshow the signal inputs, outputs, and internal signal flow.

14. SUBJECT TERMS

EOSMicrowave System

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18-53.303-1626 CFR TITLE 48 CHAPTER 18