Topsight E

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Topsight E is a helmet-mounted sight (HMD) which displays critical information, protects the pilot, and provides communications. In the display of critical information, Topsight E has three main functions:

Visual target designation by transmitting the target’s line of sight to the nav/attack system. Used with modern missiles, Topsight allows pilots to perform wide off-boresight target designation.
Visual target acquisition using reverse cueing mode where the display symbology guides the pilot’s eyes to the target tracked by the aircraft sensors. The nav/attack system provides spatial data.
Situational awareness based on concise display of vital information (tactical, navigation, safety, etc.).

Topsight E has four integrated operational modes:

Navigation is based on ring laser gyro INS with embedded GPS receiver.
Air-to-air weapon delivery includes guns, rockets and high- and low-drag bombs, using continuous computation of impact point (CCIP) and continuous computation of release point (CCRP).
Training includes failure simulations, as well as target and threat simulations.

The Topsight HMD was part of the Topflight avionics suite by French Sextant Avionique (with HUD, two MFDs, mission management computer, DMG and LINS) which was part of the so-called "MiG-21UPG" upgrade for MiG-21. This upgrade also improved Phazotron radar and Israeli-built DASS and COMMS systems. ^[1]