Subsystem Design

The design of each VLC subsystem is described in detail in this section. The purpose of each component of a subsystem, the function of the component within the VLC, operating modes of each component, and a general description of each are given. The detailed design of the bioshield, aerodecelerator, the lander body structure, landing legs, high-gain antenna deployment mechanism, and the venting assembly is discussed. The bioshield prevented recontamination of the sterilized VLC with Earth...

Info

Acomputed load to provide 99-percent landing success. '-'Flight load is tank load limit and provides 6.5-percent throttle contingency and 4.40-kg (9.7 lbm) fuel contingency. acomputed load to provide 99-percent landing success. '-'Flight load is tank load limit and provides 6.5-percent throttle contingency and 4.40-kg (9.7 lbm) fuel contingency. ability of successful landing (approximately 99 percent) and for the flight load (tank load limit). Monte Carlo analysis of the final flight load was...

Common Service Module

Figure 97.- Operational block diagram of VBI system. Operationally, the VBI functioned through its interface for commands and power from the VL while providing both engineering and scientific data to the VL for transmission to Earth. This interface was carried out within the VBI in the electrical subsystem. The other significant operational interface between the VBI and the VL provided for a supply of Martian surface sample to the VBI from the VL SSCA. This interface was implemented in the VBI...

SYMBOLS

N 30. Command data coding All command data transmitted subsequent to the preamble and contained in a message segment was coded to provide for the detection and correction of all single errors within a word and the detection of all double errors. The uncoded data word was 24 bits in length. The coding technique utilized a Hamming code in which 6 additional parity check bits were added to the 24 data bits increasing the coded word length to 30 symbols, in...

Circuit Diagram

Serial no. Initiation charge -2.22 cm 7 8 in. Serial no. Figure 77.- Viking standard initiator, Figure 77.- Viking standard initiator, loaded ceramic cup and bonded with epoxy, then a steel cup, mouth out, was pressed into the body and welded in place. When power was applied to the VSI, the bridge wire heated to incandescence resistive heating and ignited the explosive charge in contact with it. The gases resulting from the explosive reaction ruptured the...

Direct Communications System

Ionisation Current Amplifier Pics

Figure 10.- Block diagram of communications subsystem. The guidance and control subsystem, shown in the block diagram of figure 11, embodied the GCSC, IRU, RA, TDLR, VDA, and flight software. The GCSC was a block-redundant random-access, stored-program, general-purpose digital computer. It interfaced with other lander subsystems and utilized the flight software to perform guidance, steering, and control of the lander from separation to landing command processing and sequencing for all mission...