Name INTERBALL subsatellite S2-A
Orbit
-perigee altitude about 800 km (changing)
-apogee altitude 20 000 km
Inclination about 65°
orbit time 347.4 min
Stabilization rotation 0.5 r.p.m.
Orientation: spin axis towards the Sun
Mass 68.5 kg
Power of the solar battery 36W
Character. of the chemical battery 12 Volts/ 4 Ahours
Orbit correction unit Gas-jet correction engine
Total momentum 300N s
Thrust of a pair of nozzles 0.2 N
Telemetry system transmitters 136.07 MHz
137.15 MHz
400.24 MHz
400.57 MHz
1534.75 MHz
Command radioline receivers 149 MHz Band
450 MHz Band
Digital data transmission rates 40.96 kbit/s
20.48 kbit/s
5.12 kbit/s
1.28 kbit/s
Command transmission rate 61 or 122 bit/s
Digital memory capacity 4 Mbyte
Analog memory capacity 180 s ( 2.3 kHz )
Wide-band analog telemetry 10 Hz - 60 kHz
Subcarrier frequency f0 ±15% 1.3 kHz
2.3 kHz
Subcarrier frequency delta f~1KHz 24 kHz
32 kHz
Subcarrier frequency of the SSB 40.96 kHz
List of housekeeping systems Solar battery SB1-8: 14+4 parallel connected panels, 196x196 mm, 0.2A, 14V, total powermax at the nominal solar orient. is 36W. Accumulator batteries XB1,2: 10 nickel-cadmium hermetic accumulators VARTA type RSQ-4 (4 amp.hours) Voltage DC/DC converters the efficiency coefficient of the converters exceeds 0.8 and the switching freq. is 40.96 kHz synchronized by telemetry bit frequency. Primary MPA,B and MPC: performs the following functions: inversion of the voltage sign of the solar battery galvanic separation of solar battery from the primary circuit voltage limiting (output voltage is realized at the level of 14.5V) Secondary MAA,B: are used for the analog circuits supply, power 10W, output voltages are ±10V and ±5V. Secondary MDA,B: serve for power supply of the impulse and digital circuits, power 30W, output voltages are +5V and +30V Command radio line Receivers PS-4-P PPA,B: antenna - lambda/4 whips real sensitivity is better then 1΅V (signal/noise ratio = 12dB) operating frequencies on 149 MHz band. Receivers FRX453 PPC: antenna - lambda/2 whip operating frequency on 450 MHz band. Analog decoders ADA,B,C: digital information is transmitted by means of FSK- modulation (L/H) 3784 Hz/4028 Hz. Digital decoders DDA,B: digital control rate 61 or 122 bit/s, transmission of 32 main single commands and of the digital information: to the controlling ΅P of the TM-system to the onboard programmer BEV to the block of cont. 8-bit words formation Transmitters VSA,B: antenna - omnidirectional lambda/4 whip, the AF modulation band 10 Hz 60 kHz, frequency stability 10-5 Transmitters VTA,B: antenna - omnidirectional lambda/2 whips the AF modulation band 20 Hz 80 kHz frequency stability 10-5 Data collecting system STS: includes the onboard computer on the basis of the NSC-800 ΅P, the largest information block is the main block (512 bytes) consisting of 4 frames of 128 bytes, the output signal from the STS has the form of a bi-phase modulation. operating modes 14 digital and 15 analog channels transmission rate 1.28, 5.12, 20.48 and 40.96 kbit/s frame structures 8 prefixed independent Cold gas-jet engine system KDU: 10 jets, 6 directions, total impulse 300 Ns thrust of one nozzle 0.1±0.007 N pressure of the balloon 220*105 Pa pressure at the input 3.1±0.6*105Pa balloon volume 1.85 liters Attitude determination system Infrared Earths sen. HSU,D: a thermistor bolometer is used as a detec- tor of IR radiation of the Earth operating range -60°C to +40°C Solar sensor NASS: narrow-angle solar sensor for Sun vector determina- tion, FOV: ±9° Solar sensors WASS1, 2: wide-angle solar sensors for Sun vector determina- tion, FOV: ±40° Solar sensor DOS: solar sensor, FOV ±80° Solar sensor KOS: solar sensor, FOV ±2° Thermal regime: the following passive means are employed for the thermal control special surface coating to ensure proper emissivity and absorption for thermal regulation metallised multi-layer thermal cover calibrated thermal resistance isolating XB1, XB2 heat pipes to balance subsat. thermal field List of scientific measurements Magnetometer SG-R8: a triaxial flux-gate magnetometer with automatic switching of sensitivity. Range (nT) ±65536 Resolution (nT) 8 ±8192 1 ±1024 0.125 ±128 0.0156 Data from the magnetometer passes through a 14 bit AD converter (1 sign bit).The device has also one analog output. The magnetometer DMA: is a triaxial flux-gate magnetometer Range (nT) ±3200 Resolution (nT) 0.096 Bandwidth 40 and 20 kbit 10 Hz 5 and 1.25 kbit 1 Hz Wave complex KEM-3: E and B analog channels, wide-band (60 kHzmax) ana- log telemetry frequency range and sensitivity: 1 component Ex 0.1 Hz 400 kHz; 5*10-8Hz-1/2 (2 kHz) 1 component Bx 0.1 kHz 50 kHz 10-5 nT Hz-1/2 (2 kHz) or one selected component Bx,y,z 0.03 Hz 3 kHz 3*10-5 nT Hz-1/2 (2 kHz) dynamical range AGC 90dB/26dB Filterbank VLS: 2*8 parallel filters (Ex , Bx), Q=50, dyn. range 72dB Spectroanalyzer SAS: consists of two SFA analyzers, time transformer and analog telemetry unit. 1 component Ex 1 KHz 400 KHz (32 2000 Hz); 96 steps 1 component Bx 400Hz 20 KHz; 64 steps 1 component Bx,y,z 32 Hz 2000 Hz (selected by command); 64 steps intermediate frequencies 465 KHz and 5 KHz E and B ULF fields: frequency range is designed for collecting and proc- essing information on 3 components of magnetic field and one component of electric field. dynamical range 6 dB/ +30dB by command and 76 dB (12 bit ADC) sampling frequency 280 Hz ( 40 or 20 kbit/s) all 4 components 70 Hz ( 5 or 1.25 kbit/s) one selected component Spectrometer DOK-S: is designed to measure the energetic spectrum and an- gular distribution of energy by means of two pairs of silicon detectors. electron range 20 180 keV ion range 20 1300 keV Plasma flow detector VDP-S: is designed for rapid determining of the flux direction variations. Type of registered particles summa of all ions and electrons with energies above 170 eV. detector type Faraday cups 4 detectors 4, ±45° from the main axis angular aperture 100° Spectrometer MPS: is designed to carry out a long-period monitoring of the solar wind parameters and to register the ion fluxes in the bow-shock. particles ions 2 channels for ions energy range 0.2 20 keV energy resolution < 10% energy levels 16 ( can be varied by command ) angular aperture 4° ( in the plane parallel to the main axis ) method electrostatic analyzer ( 127°) with channeltron Spectrometer EPS: is a multidirectional electrostatic analyzer designed for estimating the ion energy and angular distributions. particles ions/electrons 8 channels for ions 8 channels for electrons energy range 0.2 20 keV energy resolution < 10% energy levels 16 ( can be varied by command ) angular aperture 8*45° ( in the plane parallel to the main axis ) method two toroidal electrostatic analyzers Cold plasma.KM-14: is designed for the measurement of basic parameters of cold plasma, consisting of ion density and electron temperature. Te range 1000 60000 K, time resolution is 200ms. Ni range 107 / 5*1012 m-3 Reg. Aurora borealis VIM: Video Imager System two cameras: camera for pictures of dayside of the Earth camera equipped by light intensifier for pictures of Aurora Borealis on the nightside of the Earth spectral range: visible light and near infrared FOV: 20° max. resolution: 512 x 512 pixels
Last updated: August 29, 2000