Info

Illumination of planet, as seen by nearby spacecraft Illumination of sphere, as function of phase, distance 78-79,89

image dissector, in star tracker 189

Image dissector tube star measurements, mathematical model 256-259

IMP (Interplanetary Monitoring Platform)— Attitude software structure 698

Attitude system of 790-791

Effect of flexibility on attitude dynamics 5S6 Telemetry data errors 311

Use of body-mounted horizon sensor 173 Use of convolutional encoding 282

Improper orthogonal matrix 751

Impulse (of force) 206

Impulse (of torque) 274

Impulse response function 242

Inclination, (orbit parameter) 44,46

Maneuver to change 59

Of Earth satellite orbit 53

In-crossing (See In-triggering) Induction magnetometer 181-184

Inertia wheel 201

Inertia, moment of (See Moment of inertia) Inertia! coordinate systems 26-28

Table of 28

Inertia! guidance 16

Inertia! guidance maneuvers 655-661

Inertia] nutation rate 490,526,535

Inertia! reference assembly, for HEAO-1 197 Inertia! spin rate 490

Inertially referenced spacecraft 605-608

Inferior conjunction 49-50

Inferior planet 49

Infinitesimal spherical triangles 734

Information Processing Division (1PD)

292,299-303 Infrared horizon sensors (See Horizon

Infrared radiation, from Earth 82,90-98

Initial Value Tbeorm 768

Injection 53 Determination of orbit elements from 60-62

Inner product, of" vectors 747

In-plane orbit maneuvers 56-59

Input axis (gyroscope) 196 Instantaneous rotation axis, of spacecraft 487-488

Instrumental star magnitudes 258

Integral equations, solution using Laplace transform 773-774

Integration methods 560-564

Choice of 564

Errors in 560

Subroutine (RUNGE) 692

Interactive graphics, use in mission support software 682,686-690

Interactive software system 686

Interfaces, data set vs. core storage 699

Internal torques on spacecraft 576-580

International Astronomical Union, 1976

adopted astronomical constants 827-828 International Atomic Time (TAI) 798, 802 International designation, of spacecraft 52

International Geomagnetic Reference Field 118 Coefficients of 779

Subroutine for (MAGFLD) 693

International System of Units 807-813

Prefixes. 807

International Telecommunication Union 283 Interplanetary environment 130-132

Interplanetary flight— Sample calculation 58-59

Table of orbit properties 824-825

Interplanetary probe, distinguished from satellite 52

Inter-Range Instrumentation Group 282

Intersecting cones, attitude solutions 12

intersection, of attitude measurement loci 345-346

Interstellar probe 52,60

INTP (subroutine) 693

In-triggering (Earth-in) 11,172,358

Inverse Laplace transform - 767

inverse, of a matrix 749-750

INVERT (subroutine) 691

Ion jets 206

Ion thrusters, for attituie control 19

IPD (See Information Processing Division) IR (See Infrared)

ISEE (International Sun Earth Explorer}— Application of block averaging to attitude solutions 371

Attitude determination accuracy 397

Attitude software structure 698

Attitude system of 790-791

Earth and Moon coverage for ISEE-C 402 Effect of flexibility on attitude dynamics 556 Gas jet control system 210

Panoramic scanner 169, 173-175

Slit horizon sensor/Sun sensor

169, 178-179,721 Stabilization method 503,504

Use of convolutional encoding 282

ISIS (International Satellite for Ionospheric Studies)— Attitude system of 790-791

ISS (Ionosphere Sounding Satellite}—

Attitude system of 790-791

ITOS (Improved Tiros Operational Satellites-

Attitude system of 790-793

Momentum wheel 202, 601, 602

IUE (International Ultraviolet Explorer)— Application of block averaging to attitude solutions 371

Attitude acquisition 662

Attitude determination accuracy 397

Attitude software structure 698

Attitude system of 792-793

Computation of attitude determination accuracy 384-386

Gas jet control system 207-209

Inertia] guidance maneuvers 6SS, 659,660 Momentum wheel 203

Onboard computer 210

Panoramic scanner 169, 173-175

Reaction wheels 270, 272,601

Star tracker 190

Sun sensor 157,166

Thruster characteristics 273

Use of convolutional encoding 282

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