IRNSSIndian

Regional Navigation Satellite System

Aleksander Jurica

Introduction

Regional Navigation system Developed by Indian Space

Research Organization (ISRO) Independence from US GPS GPS is not guaranteed in hostile

situations The program was approved in May

2006

Introduction

IRNSS will cover Indian subcontinent, South-east Asia, Iran, Indian Ocean, China, some parts of Australia, and Arab subcontinent.

IRNSS is expected to be realized by 2014-15 according to ISRO.

The first of seven satellites (IRNSS-1) is scheduled to be launched in June 2013

Introduction

IRNSS will provide an absolute position accuracy of better than 10 meters throughout India and within a region.

The IRNSS system mainly consists of: Ground Segment, Space Segment and User Segment.

Services

Service type Signals Frequency Band

Standard Positioning Service 1.023 Mcps L5(1191.795Mhz)

    S(2491.005Mhz)

Precise Positioning 10.23 Mcps L5

Service   S

Restricted Services for 10.23 Mcps L5

Special Users    

 IRNSS Space Segment

Seven satellites - three in GEO orbit (at 34º E, 83º E and 131.5º E , 36000 km altitude)

four in GSO (Geosynchronous orbit) ( 35,786 km) orbit inclined at 29 degrees to the equatorial plane with their longitude crossings at 55º E and 111.5º E (two in each plane)

PowerPlugs: Templates

Highest Quality Greatest Quantity Largest Variety Consistent Professionalism Visually Appealing

IRNSS Space Segment

All the satellites will be continuously visible in the Indian region for 24 hours a day.

The life span of the GEOs is 9.5 years and 11 years in the case of the GSOs.

The Indian GSLV-Mk III launcher will be used for launching.

The proposed satellite specifications are:

Dry mass of the satellite ~ 600 kg Power generation 1400 watts Fuel loading capacity ~ 785 kg Accommodates navigation payload

of weight 102 kg and 375 watts of power 

IRNSS Ground Segment 

Responsible for the maintenance and operation of the IRNSS constellation.

IRNSS Ground Segment  IRNSS Space Craft Control Centre

(SCC) IRNSS Navigation Centre (INC) IRNSS TTC & Up linking Stations

(IRTTC) IRNSS Range and Integrity

Monitoring Stations (IRIMS) IRNSS Timing Centre (IRNWT) IRNSS CDMA Ranging Stations

(IRCDR) Laser Ranging Station (ILRS) Data Communication Network

(IRDCN)

IRNSS User segment

Made of the IRNSS receivers. Dual-frequency receivers or single

frequency with capability to receive ionospheric correction.

The user receiver will have a minimum gain G/T of -27 dB/K.

They will be able to receive and process navigation data from other GNSS constellations

PowerPlugs: Templates

Highest Quality Greatest Quantity Largest Variety Consistent Professionalism Visually Appealing

IRNSS Signal Plan

Made of the IRNSS receivers. Dual-frequency receivers or single

frequency with capability to receive ionospheric correction.

The user receiver will have a minimum gain G/T of -27 dB/K.

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