# navigation satellite

> satellite for navigation

**Wikidata**: [Q1285444](https://www.wikidata.org/wiki/Q1285444)  
**Source**: https://4ort.xyz/entity/navigation-satellite

Here’s the structured knowledge entry for **navigation satellite**:

---

## Summary  
A navigation satellite is a human-made artificial satellite designed to provide positioning, navigation, and timing (PNT) services globally. These satellites form the backbone of Global Navigation Satellite Systems (GNSS) like GPS (United States), GLONASS (Russia), and Galileo (European Union). They enable precise location tracking for civilian and military applications worldwide.

## Key Facts  
- **Subclass of**: Artificial satellite (human-made object in orbit).  
- **Primary use**: Global navigation satellite systems (GNSS).  
- **Notable systems**: Includes GPS (United States), GLONASS (Russia), Galileo (EU), and regional systems like IRNSS (India) and Michibiki (Japan).  
- **Military applications**: Some models (e.g., GLONASS-K, Timation) are designed for military use.  
- **Civilian applications**: Used in everyday technologies like smartphones, aviation, and maritime navigation.  
- **YSO ID**: 6541 (categorized under "navigation satellites").  
- **Mil-STD-2525 symbols**: Distinct codes for civilian (`10010500001209000000`) and military satellites (`10010500001114000000`).  
- **Wikidata description**: "Satellite for navigation."  

## FAQs  
### Q: What is the purpose of a navigation satellite?  
A: Navigation satellites provide precise positioning, timing, and navigation data for civilian and military use, enabling technologies like GPS mapping and location services.  

### Q: Which countries operate navigation satellite systems?  
A: Major operators include the United States (GPS), Russia (GLONASS), the EU (Galileo), Japan (Michibiki), and India (IRNSS).  

### Q: Are navigation satellites only for military use?  
A: No, while some models (e.g., Timation, GLONASS-K) are military-focused, most modern systems (e.g., GPS, Galileo) serve dual civilian and military purposes.  

## Why It Matters  
Navigation satellites revolutionized global positioning, enabling everything from turn-by-turn directions to precision agriculture and disaster response. They underpin modern infrastructure, ensuring synchronization in telecommunications, financial systems, and transportation. Military applications include missile guidance and troop coordination, while civilian uses span logistics, aviation, and personal navigation. Without these satellites, critical services like emergency response and global trade would face severe disruptions. Their impact extends beyond technology, influencing economic growth, scientific research, and national security.  

## Notable For  
- **Core technology**: Enables Global Navigation Satellite Systems (GNSS), a foundational utility for modern life.  
- **Dual-use systems**: Many satellites (e.g., GPS, Galileo) serve both civilian and military needs.  
- **Regional variants**: Includes specialized systems like Japan’s Michibiki and India’s IRNSS.  
- **Standardized identification**: Recognized by MIL-STD-2525 codes for civilian and military classification.  

## Body  
### Classification  
- **Instance of**: Spacecraft type.  
- **Subclass of**: Artificial satellite.  

### Major Systems and Models  
- **GPS (United States)**: NAVSTAR satellites power the Global Positioning System.  
- **GLONASS (Russia)**: Includes models like GLONASS-K, GLONASS-M, and GLONASS-K2.  
- **Galileo (EU)**: Comprises generations like In-Orbit Validation, Full Operational Capability, and Second Generation.  
- **Regional systems**:  
  - Japan’s Michibiki series (e.g., Michibiki 1R, Michibiki 6).  
  - India’s IRNSS-1A.  

### Technical Standards  
- **MIL-STD-2525 codes**:  
  - Civilian: `10010500001209000000`.  
  - Military: `10010500001114000000`.  

### Historical Development  
- Early U.S. prototypes: Navigation Technology Satellite (NTS) series (NTS-1, NTS-2, NTS-3).  
- Soviet-era systems: Tsikada satellites.  

## Schema Markup  
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "navigation satellite",
  "description": "A human-made artificial satellite designed to provide global positioning, navigation, and timing services.",
  "sameAs": [
    "https://www.wikidata.org/wiki/Q1330657",
    "https://en.wikipedia.org/wiki/Satellite_navigation"
  ],
  "additionalType": "Spacecraft"
}

## References

1. YSO-Wikidata mapping project