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A High Data Rate Storage System for Nimbus B

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A High Data Rate Storage System for Nimbus B The Space Congress® Proceedings 1967 (4th) Space Congress Proceedings Apr 3rd, 12:00 AM HDRSS- A High Data Rate Storage System for Nimbus B R. Curry Astra-Electronics Division, Radio Corporation of America, Princeton, N. J. Follow this and additional works at: https://commons.erau.edu/space-congress-proceedings Scholarly Commons Citation Curry, R., "HDRSS- A High Data Rate Storage System for Nimbus B" (1967). The Space Congress® Proceedings. 3. https://commons.erau.edu/space-congress-proceedings/proceedings-1967-4th/session-13/3 This Event is brought to you for free and open access by the Conferences at Scholarly Commons. It has been accepted for inclusion in The Space Congress® Proceedings by an authorized administrator of Scholarly Commons. For more information, please contact [email protected]. HDRSS -A HIGH DATA RATE STORAGE SYSTEM FOR NIMBUS B R. Curry Astra-Electronics Division Radio Corporation of America, Princeton, N. J. Summary The heart of the HDRSS is a 5-channel tape recorder which stores and reproduces digital data and analog The high data rate storage system ( HDRSS) is video signals for transmission to NIMBUS ground sta­ being developed to provide storage and reproduction tions. During an orbital revolution the signals from of data aboard the NIMBUS B Satellite. The system two sensors and a clock are transmitted in real time uses a 5-channel 2-speed tape recorder and a 5-· to local stations and simultaneously stored in the tape channel frequency division multiplexer. The system recorder. Later, as the spacecraft passes over a is tested using a bench checkout unit, which simulates ground station, the data is read from the recorder at spacecraft signals and ground station processing a rate 32 times that at which it was recorded. The functions. signals from the five tracks are frequency multiplexed and transmitted to earth via an S-band FM communica­ Introduction tions link. The high data rate storage system ( HDRSS) Functional Description (Fig. 1) is being developed by RCA for NASA to pro­ vide storage and replay of sensor data aboard the The tape recorder (Fig. 3) operates in two modes: NIMBUS B satellite. NIMBUS B is the third satellite record and playback. The modes of operation are con­ to date in the NIMBUS series. trolled by the record end-of-tape switch (reverts to off), the playback end-of-tape switch (reverts to re­ The NIMBUS program involves stabilized, ex­ cord ) and the record on, playback on, and off com­ perimental meteorological satellites designed to mands. Both recording systems may be operating circle the earth in a 600-nmi, near-polar, sun­ simultaneously; alternatively, the two recorders may synchronous orbit with an orbital period of approxi­ be operated sequentially to provide greater storage mately 107 minutes. The NIMBUS television and in­ capacity. frared sensors provide complete coverage of every point on the earth's surface once in daylight and once Five signals are recorded in the HDRSS: The image in darkness every 24 hours. During each orbital dissector (JD) video signal ( 0 to 1, 600 Hz); the high revolution, continuous infrared mappings and 31 resolution infrared radiometer ( HRIR) signal ( 0 to single-frame television photographs are made. 360 Hz); the infrared interferometer spectrometer (IRIS) signal, a biphase 3, 750-bit Is data signal; the On NIMBUS I, orbital coverage photographs were medium resolution infrared ( MRIR ) signal, a biphase obtained using a rapid-readout ( 6. 4 seconds) auto­ data signal at a rate of 1, 600 bits/s; and the timing matic vidicon camera system (AVCS) and a tape re ­ signal, a 2, 500-Hz carrier, amplitude modulated by corder with a 1:1 record-playback speed ratio, re­ the 100 - bit/s NASA Mini track pulse width modulated sulting in a video bandwidth of 60 kHz for an 800-line ( PWM) time code. picture. This bandwidth, suitable for transmission to the ~o high-gain command and data acquisition Recorder Electronics ( CDA) ground stations, is too large for the smaller weather stations provided around the world for use Before the ID and HRIR signals are recorded, they with TIROS automatic picture transmission (APT) are converted from video to frequency modulated sub­ satellites. The APT camera readout time is 208 carrier signals in the tape recorder electronics. The seconds, resulting in a video bandwidth of 1. 6 kHz. time- code, IRIS, and MRIR signals are amplified and are then recorded directly without further processing. To provide the capability both for real-time transmission to the local stations and complete or­ Tape Transport bital readout at the CDA station, the tape recorder speed-up concept was adopted. The HDRSS (Fig. 1) The FM modulators and the input amplifiers are consists of redundant spacecraft tape recorders and located on an electronics module in the tape recorder multiplexers, ground station demultiplexers, sub­ assembly but are not contained in the transport en­ carrier demodulators, digital decoders and video closure. The transport enclosure, which is pressur­ display equipment. Some of the ground station equip­ ized to 2 psig with an inert gas, contains the drive ment was designed during the NIMBUS I and II pro­ motors, the record heads and head driving a:mplifiers, grams; the spacecraft equipment was designed specifi­ the playback heads and differential playback pre­ cally for NIMBUS B. The spacecraft subsystem amplifiers, and some of the motor control relay cir­ (Fig. 2) weighs 32 pounds and requires a power of cuits. The playback phase equalizers (digital tracks) 23 watts. and the playback limiters are located on the electronics 13 - 37 module outside the transport enclosure. The HRIR In the ground station demultiplexer (Fig. 6 ), the and ID channels have only playback amplifiers and IRIS channel consists of a low-pass filter and an equal­ limiters. izer which corrects the phase response of the cas­ caded multiplex-demultiplex filters to with ±1 µ s. The HRIR signal, at playback speed, is a fre - quency modulated wave with a center frequency of Timing Signal 87. 5 kHz with a frequency deviation of ±13. 75 kHz at a maximum modulating frequency of 11. 5 kHz. The The second channel is the timing channel with a ID signal, at playback speed, is a frequency modulated passband from 171 to 203 kHz. The input signal con­ wave with a center frequency of 96 kHz, a peak fre­ sists of an 80-kHz carrier, amplitude modulated by quency deviation of 24 kHz and a maximum modulating a PWM time code which has a pulse repetition fre­ frequency of 51. 2 kHz. The timing signal is an 80 quency of 3. 2 kHz and pulse durations of 60 and 180 µ s kHz carrier, amplitude modulated by a 3. 2 -kilobit/s for O and 1, respectively. The timing signal is heter­ PWM waveform. The IRIS and MRIR playback chan - odyned with a 267-kHz local oscillator; the difference nels are amplitude and phase equalized and are ampli­ frequencies are selected by the 171 - to-203-kHz band­ tude limited. They contain biphase data at 120 and pass filter. 53.3 kilobit/s, respectively. The ID, HRIR, and tim­ ing signals from the recorder go directly to the multi­ At the demultiplexer, a 171-to-·203-kHz filter plexer; while each biphase signal first passes to a selects the timing signal; no further heterodyning is repeater which removes some of the high frequency required as the signal is passed directly to the time jitter introduced by flutter in the tape recorder. code detectors and the flutter discriminator at 187 kHz. Biphase Repeater MRIR Signal The two biphase repeaters (Fig. 4) are identical except for the data and clock bandwidhts. The incom ­ The MRIR signal is placed in channel 3 of the ing signal and noise are amplified, band limited, and multiplexer. The MRIR biphase data, at a rate of amplitude limited. The output of the limiter is then 53. 3 kilobits/s, modulate a 300-kHz local .oscillator. processed simultaneously on two separate paths: a The resulting double-sideband AM signal is passed timing extraction path and a data path. In the timing through a 235-to-365-kHz filter. The equivalent extractor the incoming data is differentiated and used basebandwidth is :1:65 kHz, or approximately ±1. 2 to drive a one -shot pulse generator. The standardized times the bit rate. pulses from the one-shot are combined with the out­ put of a voltage controlled (saw tooth) oscillator ( VCO) At the demultiplexer, the signal is selected by a in a multiplier. The output of the multiplier is filtered filter with a passband from 235 to 365 kHz and is heter­ to develop an average bias voltage which controls the odyned with a 475-kHz local oscillator. The difference frequency of the VCO. The output of the VCO (the frequencies are selected by a low-pass 270-kHz filter extracted timing) is used to sample the incoming sig­ and are passed through a phase corrector having a nal in the data path. Additional flip-flop stages are passband from 110 to 240 kHz. This channel, used in used to generate pulses during tape dropouts so that NIMBUS I for an FM video subcarrier, is phase­ the decoder at the ground station will not lose synchro­ equalized to within ±5 µs of constant time delay. At nism. If this feature were not provided, the ground this point, the signal is a double-sideband AM wave station decoder would lose data during reacquisition with a center frequency of 175 kHz. This signal is of timing in addition to the data lost during the drop­ envelope detected to recover the biphase MRIR data out.
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