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IRNSS-1D is a satellite in the Indian Regional Navigational Satellite System (IRNSS) constellation. The satellite is the fourth of seven in the constellation, launched after IRNSS-1A, IRNSS-1B and IRNSS-1C. The satellite is the only satellite in the constellation slated to provide navigational services to the region. The satellite will be placed in geosynchronous orbit.[

The satellite will help in augmenting the satellite based navigation system of India which is currently under development. The navigational system so developed will be a regional one targeted towards South Asia. The satellite will provide navigation, tracking and mapping services.[8]

IRNSS-1D satellite has two payloads: a navigation payload and CDMA ranging payload in addition with a laser retro-reflector. The payload generates navigation signals at L5 and S-band. The design of the payload makes the IRNSS system inter-operable and compatible with Global Positioning System (GPS) and Galileo.[4] The satellite is powered by two solar arrays, which generate power up to 1,660 watts, and has a life-time of ten years.

Alternate Names

    Facts in Brief

    Launch Date: 2015-03-28
    Launch Vehicle: PSLV-XL
    Launch Site: Sriharikota, India

    Funding Agency

    • Indian Space Research Organization (India)


    • Navigation/Global Positioning

    Additional Information

    Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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