CAN-Based True Ground Speed Radar Sensor for Precision Seeding and Spraying Control

In modern agriculture, speed is not just a number on the tractor dashboard. For precision seeders, sprayers, fertilizer spreaders, and intelligent agricultural machines, ground speed is one of the most important data inputs in the entire control system.

When the machine moves faster, the controller must increase seed release, liquid flow, or fertilizer output. When the machine slows down, the controller must reduce the application rate immediately. If the speed signal is delayed, unstable, or affected by wheel slip, the machine may continue working, but the field result will not be accurate.

This is why more OEMs, agricultural machinery manufacturers, and precision farming system integrators are choosing CAN-based true ground speed radar sensors. Compared with traditional wheel speed sensors, mechanical pickup sensors, and GPS-only speed sources, radar measures the actual movement of the machine relative to the ground surface. When this real ground speed data is transmitted through a CAN interface, the controller can receive stable, digital, real-time speed information for closed-loop seeding and spraying control.

The ZLYTGSS01 24GHz Ground Speed Radar is designed for this type of low-speed agricultural application. With a K-band RF integrated circuit design, CW operating mode, CAN output in m/s, pulse interface compatibility, and a minimum detectable speed as low as 0.1 m/s, it provides a practical speed sensing solution for smart tractors, planters, sprayers, and autonomous agricultural platforms.

Why Ground Speed Data Matters in Precision Seeding and Spraying

Precision farming depends on accurate machine movement data. Whether the system is controlling seed spacing, spray volume, fertilizer output, or implement timing, the controller must know how fast the machine is actually moving across the field.

In seeding operations, ground speed affects seed spacing. If the controller thinks the tractor is moving faster than it really is, it may release seeds too quickly, causing overplanting and wasted seed. If the controller thinks the tractor is moving slower than it really is, seed spacing may become too wide, leading to uneven emergence and lower yield potential.

In spraying operations, ground speed directly affects application rate. When a sprayer slows down near field edges, curves, slopes, or wet areas, the flow control system must respond quickly. If the speed input is wrong, the sprayer may apply too much chemical in one area and too little in another. The result can be crop stress, poor weed control, higher chemical cost, and uneven field performance.

For fertilizer spreading, the same logic applies. Application rate must match travel speed. Any error in speed measurement becomes an error in material placement.

This is why a true ground speed radar sensor is not only a speed sensor. It is a key input device for the entire precision agriculture control chain.

The Problem with Wheel Speed Sensors in Agricultural Fields

Wheel speed sensors are simple and widely used, but they do not always represent true ground speed. They measure wheel rotation, not actual movement over the soil.

In dry, flat, hard surfaces, wheel speed may be close to real ground speed. But agricultural fields are rarely perfect. Soil can be wet, loose, muddy, uneven, or compacted differently across the same field. Tires can slip when pulling heavy implements. Wheel diameter can change slightly under load. Tracks and tires may lose traction when climbing slopes, turning at headlands, or working after rain.

In these conditions, the wheel may rotate faster or slower than the machine’s actual movement. The controller receives a speed signal, but the signal is not the real ground speed.

For basic driving, this may be acceptable. For precision seeding and spraying, it is not.

A true ground speed radar sensor solves this problem by measuring movement relative to the ground surface instead of relying on wheel rotation. The radar transmits electromagnetic waves toward the ground and analyzes the Doppler frequency shift of the reflected signal. Because the measurement is based on actual ground movement, it is independent of tire slip, tire deformation, wheel load, and many mechanical transmission errors.

Why CAN Output Is Valuable for Smart Agricultural Controllers

Many agricultural machines still use pulse speed signals because they are simple and compatible with older controllers. However, as machinery becomes more intelligent, digital communication becomes more important.

CAN communication is widely used in modern vehicles and agricultural equipment because it allows sensors, controllers, displays, and electronic control units to share data through a robust communication network. For ground speed radar, CAN output brings several advantages.

First, CAN provides digital speed data directly to the controller. Instead of converting frequency pulses into speed, the controller can receive speed values in m/s, reducing conversion complexity and improving integration efficiency.

Second, CAN communication is suitable for multi-node systems. A smart tractor, seeder, or sprayer may already include engine control, hydraulic control, steering control, flow control, section control, and display modules. A CAN-based radar sensor can become part of this digital network and provide speed data to multiple systems.

Third, CAN output supports better system diagnostics. In an OEM platform, engineers may want to monitor whether the sensor is powered correctly, whether the signal is stable, whether speed data is updating normally, and whether the controller is receiving valid values. Digital communication makes this easier than a simple analog or pulse-only interface.

Fourth, CAN speed data is useful for automation. Autonomous tractors, robotic sprayers, electric seeders, and smart implements require machine-readable speed information that can be used by algorithms. A stable CAN-based true ground speed radar sensor can provide the low-speed motion feedback needed for these systems.

Low-Speed Detection: The Key Requirement Many Sensors Miss

Many agricultural operations happen at relatively low speeds. Precision seeding, orchard spraying, vineyard machinery, vegetable planting, transplanting, greenhouse transport vehicles, and autonomous field robots may all operate slowly.

At low speeds, speed measurement becomes more difficult. GPS may update too slowly or fluctuate when the machine moves at creeping speed. Wheel sensors may be affected by small slips or vibration. Some radar sensors are designed for general speed detection but are not optimized for very low-speed operation.

The ZLYTGSS01 is specifically designed for low-speed measurement scenarios. Its minimum detectable speed can be as low as 0.1 m/s, and its speed range covers 0.36 km/h to 80 km/h. This makes it suitable not only for normal tractor travel, but also for slow field operations where accurate movement data is critical.

For precision seeding, stable low-speed detection helps maintain seed spacing when the tractor starts, stops, turns, or moves slowly in difficult soil. For spraying, low-speed detection helps the controller adjust flow when entering rows, working around field boundaries, or operating in orchards and vineyards where speed changes frequently.

In many real field operations, the most important speed data is not the top speed. It is the stable speed data at the low end.

How CAN-Based TGSS Improves Precision Seeding Control

A seeding controller must coordinate ground speed, seed meter rotation, row spacing, target population, and implement status. If ground speed is accurate, the controller can calculate how many seeds should be released per second to maintain the desired spacing.

A CAN-based true ground speed radar sensor improves this process in several ways.

It gives the controller real ground speed instead of wheel rotation speed. This helps reduce seed spacing errors caused by tire slip, especially in soft soil, wet fields, or hilly terrain.

It provides digital speed data that can be processed directly by modern control systems. This is useful for OEM seeders and precision agriculture controllers that already use CAN communication.

It improves response during acceleration and deceleration. When the tractor starts moving or slows down near a turn, the controller needs reliable speed data to avoid seed bunching or spacing gaps.

It supports consistent performance across different tractor platforms. For machinery manufacturers, using a radar-based ground speed source reduces dependence on the tractor’s original speed signal, which may vary by model, tire size, transmission type, or calibration condition.

For seeders, the value of true ground speed is not only accuracy. It is repeatability. Farmers want the same spacing performance across different fields, soil conditions, and operating days. Radar-based speed measurement helps create that consistency.

How CAN-Based TGSS Supports Spraying Rate Control

Sprayer controllers rely on speed input to calculate flow rate. The faster the sprayer moves, the more liquid must be applied per minute to maintain the target application rate per hectare or acre. The slower the sprayer moves, the flow must decrease.

A wrong speed signal leads directly to wrong application.

A CAN-based true ground speed radar sensor helps sprayer control systems maintain more accurate flow response. When the sprayer enters a muddy area and the wheels slip, the radar continues measuring actual ground movement. When the machine slows down near headlands, the controller receives updated speed data and can reduce output. When the sprayer works in orchards, vineyards, or uneven terrain, the radar provides a stable speed reference that is not dependent on wheel rotation.

For smart sprayers, the CAN interface is especially useful. Many modern sprayers include boom section control, nozzle control, pressure sensors, flow meters, GPS guidance, and display terminals. Ground speed data must be shared quickly and reliably. CAN communication makes the radar sensor easier to integrate into this type of system architecture.

In addition, CAN-based speed output helps OEMs design cleaner wiring and more modular control platforms. Instead of treating the radar as a separate accessory, the radar can become a standard digital sensor in the machine network.

Pulse Compatibility Still Matters for Retrofit Markets

Although CAN is important for modern agricultural machinery, pulse output remains valuable. Many existing tractors, planters, sprayers, and monitors still use pulse speed sensor inputs.

The ZLYTGSS01 supports a pulse interface compatible with conventional pulse speed sensors. Its pulse speed data can be configured so that 36.6 Hz represents 1 km/h and 58.9 Hz represents 1 mph. This allows the radar sensor to serve both new digital platforms and retrofit applications.

For distributors and agricultural equipment service companies, this dual-interface flexibility is important. A customer may need CAN output for a new smart controller, while another customer may need pulse output for an older planter monitor or sprayer control system. One radar platform with both interface options can simplify inventory, installation, and technical support.

For OEMs, pulse compatibility also provides backward compatibility. A machine manufacturer can use CAN for new systems while still supporting customers who require traditional speed input formats.

Why 24GHz K-Band CW Radar Fits Ground Speed Measurement

The ZLYTGSS01 uses a 24GHz K-band RF integrated circuit design and CW operating mode. For ground speed measurement, this architecture is practical and efficient.

CW radar is well suited for speed detection because it continuously transmits a signal and measures the Doppler shift from the reflected wave. For a ground speed radar sensor, the target is not a single object but the ground surface under the machine. The sensor must detect the relative movement between the machine and the ground and convert that movement into speed data.

The 24GHz frequency band offers a good balance of compact antenna design, stable speed detection, and cost-effective implementation. With a 15° horizontal and 15° vertical beamwidth, the radar can focus on the ground measurement area while reducing unnecessary interference from surrounding objects.

For agricultural use, ruggedness and stability are more important than complex imaging. The radar does not need to identify crop types, obstacles, or field boundaries. Its job is to deliver stable, accurate ground speed data to the controller. A dedicated 24GHz CW radar design is a practical solution for this task.

Application Scenarios for CAN-Based True Ground Speed Radar

A CAN-based true ground speed radar sensor can be used in many agricultural and off-highway applications.

For precision seeders, it provides real-time speed input for seed meter control, row spacing consistency, and low-speed start-stop performance.

For sprayers, it helps maintain accurate chemical application rate, especially when speed changes frequently or wheel slip occurs.

For fertilizer spreaders, it supports more consistent material distribution by matching output to actual travel speed.

For tractors, it can provide true ground speed feedback for displays, implement control, and wheel slip comparison.

For autonomous agricultural vehicles, it offers low-speed motion feedback that can support control algorithms, path following, and machine safety logic.

For OEM control systems, it becomes a digital speed node in the CAN network, making system integration more flexible and scalable.

Key Specifications of ZLYTGSS01 for Agricultural OEMs

The ZLYTGSS01 24GHz Ground Speed Radar is designed for low-speed measurement scenarios and agricultural machine integration.

Key features include:

K-band RF integrated circuit design for compact and stable radar performance.

CW operating mode for Doppler-based speed measurement.

Minimum detectable speed as low as 0.1 m/s.

Speed range from 0.36 km/h to 80 km/h.

Speed measurement error less than ±1 km/h.

CAN interface with output in m/s and 500 Kbps baud rate.

Pulse interface compatible with conventional pulse speed sensors.

Pulse speed data where 36.6 Hz represents 1 km/h and 58.9 Hz represents 1 mph.

Operating voltage from 9V to 16V, with typical 12V operation.

Operating temperature from -45°C to +85°C.

15° horizontal and 15° vertical antenna beam angle.

These specifications make the sensor suitable for harsh agricultural environments, low-speed operation, and both digital and traditional control systems.

What OEMs Should Consider When Integrating a CAN Ground Speed Radar

When selecting a true ground speed radar sensor for seeding or spraying control, OEMs should consider more than the speed range.

The first factor is low-speed stability. A sensor that performs well at higher speeds may still struggle at creeping speed. For precision farming, stable low-speed output is essential.

The second factor is interface compatibility. CAN output is important for modern machines, but pulse output may still be required for retrofit markets and older controllers.

The third factor is environmental durability. Agricultural machines operate in dust, vibration, moisture, heat, cold, and mud. A ground speed sensor must maintain stable performance across changing field conditions.

The fourth factor is installation flexibility. Beam angle, mounting position, and field of view affect signal quality. OEMs should ensure the radar can be mounted in a practical location with a clear view of the ground.

The fifth factor is controller integration. Speed data should be easy to interpret, stable during acceleration and deceleration, and compatible with the control logic of seeders, sprayers, and other implements.

A good ground speed radar sensor should not create extra complexity. It should simplify the machine’s speed data architecture.

The Future: Speed Data as a Foundation for Smart Farming

As agriculture moves toward automation, electric implements, AI-assisted control, and data-driven field operations, true ground speed data will become more important.

Future agricultural machines will not only need to know where they are. They will also need to know exactly how fast they are moving in real time, especially at low speeds. Positioning data, camera data, flow data, seed data, and implement control data all become more valuable when they are matched with accurate motion data.

CAN-based true ground speed radar sensors will play an important role in this transition. They provide a bridge between physical machine movement and digital control systems. By delivering reliable ground speed data, they help controllers make better decisions, improve input accuracy, reduce waste, and support more intelligent machine behavior.

For precision seeding and spraying, the result is clear: better speed data leads to better field performance.

Conclusion

A CAN-based true ground speed radar sensor is more than a replacement for a wheel speed sensor. It is a critical data source for precision seeding, spraying, fertilizer application, and smart agricultural control systems.

By measuring actual ground movement instead of wheel rotation, the radar sensor helps eliminate errors caused by wheel slip, tire deformation, and changing soil conditions. By transmitting speed data through CAN, it becomes easier to integrate with modern agricultural controllers, displays, ECUs, and automation platforms.

The ZLYTGSS01 24GHz Ground Speed Radar combines low-speed detection, CAN output, pulse compatibility, CW radar technology, and rugged operating performance. With a minimum detectable speed as low as 0.1 m/s and a speed range from 0.36 km/h to 80 km/h, it is especially suitable for tractors, seeders, sprayers, and intelligent agricultural equipment that require stable speed data in real field conditions.

For OEMs and system integrators building the next generation of precision farming machines, accurate ground speed is not optional. It is the foundation of reliable control.

A CAN-based true ground speed radar sensor gives agricultural machines the speed intelligence they need to seed more evenly, spray more accurately, reduce waste, and work smarter in every field condition.