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Tech Chat | TCP vs UDP in RTK: What’s the Difference and Which Should You Choose?

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Tech Chat | TCP vs UDP in RTK: What’s the Difference and Which Should You Choose?

2026-04-14

Kimberly

In RTK operations, the performance of the data link directly affects positioning stability and user experience. When using network-based corrections, users may encounter different transmission protocol options such as TCP and UDP. Our products such as Orion One, X1, and SV100 support both protocols.

Understanding the differences between TCP and UDP helps in choosing the appropriate data link for different working environments. This blog explains their key differences and provides practical guidance for RTK applications.

1. Basic Concepts of TCP and UDP

TCP (Transmission Control Protocol)
A connection-oriented and reliable transport protocol that ensures data integrity and correct sequencing through acknowledgment and retransmission mechanisms.

UDP (User Datagram Protocol)
A connectionless protocol that focuses on speed and real-time performance. It sends data without establishing a connection and does not guarantee delivery.

2. Comparison of Core Mechanisms

Feature	TCP	UDP	Impact in RTK
Connection Method	Requires connection establishment before data transfer	Sends data directly without connection	TCP introduces startup delay; UDP enables immediate transmission
Reliability Mechanism	ACK and retransmission ensure data delivery	No acknowledgment or retransmission	TCP improves reliability but increases latency; UDP may lose packets but keeps data flow smooth
Data Sequence Control	Ensures ordered delivery	No order guarantee	TCP avoids disorder but may cause delay; UDP processes data continuously
Congestion & Flow Control	Dynamically adjusts transmission rate	No control mechanism	TCP adapts to poor networks; UDP maintains speed but may increase packet loss

3. Practical Performance in RTK Applications

	TCP	UDP
Advantages	High data integrity Stable in poor or fluctuating networks	Low latency Smoother and more continuous data flow
Limitations	Retransmission may increase latency Possible "stuttering" under unstable networks	Possible packet loss Requires relatively stable network conditions

TCP

UDP

Advantages

High data integrity

Stable in poor or fluctuating networks

Low latency

Smoother and more continuous data flow

Limitations

Retransmission may increase latency

Possible "stuttering" under unstable networks

Possible packet loss

Requires relatively stable network conditions

4. Application Recommendations

In RTK applications, the choice between TCP and UDP depends on the working environment:

Use TCP when:

Network conditions are unstable
Data reliability is critical
Working over public or long-distance internet connections

Use UDP when:

Low latency is required
Network quality is relatively good
Real-time performance is prioritized (e.g., dynamic surveying, machine control)

Conclusion

Both TCP and UDP have their advantages in RTK data transmission. TCP provides higher reliability and stability, while UDP offers better real-time performance with lower latency.

By selecting the appropriate protocol based on actual working conditions, users can achieve a better balance between positioning stability and responsiveness in RTK operations.

Key Words

Geospatial TCP UDP RTK GNSS Receiver

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