four-element anti-jamming navigation device with requencies supported  B1/L1/E1 

This is a four-element anti-jamming navigation device RS-AJ-S-4-50 supporting the B1, L1, and E1 frequency bands. It is capable of mitigating various types of interference—including wideband, narrowband, pulse, and frequency-hopping signals—and can suppress interference originating from one to three directions. Featuring a low-cost, compact, and lightweight design, the device meets high-precision navigation requirements in complex environments and is widely used in fields such as UAV navigation, electronic warfare, autonomous driving, and high-precision surveying and mapping.

Dimensions: 50×50×20mm (±0.5mm)

Weight: ≤120g

Power consumption: ≤4W, Receiver with AJ active ≤6W

Antenna array: 4-element

Interference suppression types: wideband, narrowband, pulse, swept-frequency, and other interference suppression methods.

Number of supported interference sources: 1–3 directional interference sources.

Frequencies Supported (default): B1/L1/E1 

Interference Suppression Performance:

1J/S≥95dB @ -130 dBm,

2J/S≥80dB @ -130 dBm

3J/S≥60dB @ -130 dBm

Anti-interference coverage: Azimuth 0°–360°, elevation –10°–90°

Impedance: RF impedance 50 Ω

RF output power: –70 dBm to –55 dBm

Supply voltage: C 9~32V 

Temperature range: 40℃~+70℃ 

Interfaces: J30J-9ZK+SMA 

Data Interface: RS422

Serial port level: LVTTL (Default) 

Mounting: overhead installation 

Waterproof Rating: IP65

Product Features: Low-cost, compact, and lightweight design, suitable for precise navigation requirements in complex environments.

FAQ:

1. Which platforms are CHREDSUN GNSS anti-jamming antennas suitable for?

CHREDSUN GNSS anti-jamming antennas are intended for lawful civilian and commercial applications, including industrial UAVs, agricultural drones, autonomous ground vehicles, mobile mapping equipment, unmanned surface vessels, marine survey platforms, and outdoor robotics.

Our product range allows customers to select an antenna according to platform size, payload capacity, available power, supported GNSS bands, and operating conditions. Compatibility should be confirmed for the specific platform and navigation system rather than assumed from the application alone.

2. How do CHREDSUN antennas mitigate interference from multiple sources?

CHREDSUN multi-element antenna arrays use spatial signal processing to reduce unwanted RF energy arriving from different directions while preserving usable satellite navigation signals.

Interference-source capacity depends on the model and test conditions. For example, the 4-element RS-AJ-S-4-65 is is specified to counter 1–3 suppression interference sources, the 8-element RS-AJ-S-8-130 is specified to counter 1–7 suppression interference sources, while the dual-16-element RS-AJ-D-16-300 is specified for 1–15 sources from different directions. Both address broadband, narrowband, swept-frequency, pulse, and combined suppression interference scenarios

Actual performance depends on interference power, arrival directions, signal characteristics, installation conditions, and receiver configuration. These capabilities improve GNSS resilience; they do not guarantee uninterrupted positioning in every environment.

3. Do all CHREDSUN anti-jamming antennas also provide anti-spoofing protection?

No. CHREDSUN offers suppression-focused GNSS anti-jamming antennas as well as models combining anti-jamming and anti-spoofing functions.

Our combined-protection models are designed to address both unwanted interference and false GNSS signals. For example, RS-AJ-S-8-130 supports replay and generative spoofing mitigation for up to four spoofing sources from different directions, while RS-AJ-D-16-300 is specified for up to eight. High-power spoofing signals with a J/S ratio of at least 30 dB are handled as suppression interference; the RS-AJ-D-16-300 specification notes that this requires additional anti-suppression channels.

Customers should select a model explicitly specified for anti-spoofing when false position or time information is part of their risk assessment.

4. What is the difference between GNSS jamming and spoofing?

Jamming interferes with a receiver’s ability to track genuine satellite signals. Spoofing attempts to mislead the receiver using false navigation signals.

CHREDSUN’s combined anti-jamming and anti-spoofing models are designed to mitigate suppression interference, replay spoofing, generative spoofing, and mixed interference scenarios. They also provide interference-awareness information to help the host system monitor navigation conditions.

Anti-jamming focuses primarily on signal availability. Anti-spoofing adds protection against deceptive signals that may affect the reported position or time.

5. What is the power consumption of CHREDSUN antennas?

Power consumption varies by model, array architecture, supported frequency bands, receiver configuration, and operating mode.

These values come from the respective model specifications.

When selecting an antenna, account for the additional power demand in the platform’s endurance and thermal calculations. Contact us with your available power budget so we can help identify a suitable configuration.

6. What operating temperatures and environmental protection do CHREDSUN antennas support?

Environmental ratings are model-specific. RS-AJ-S-8-130 and RS-AJ-D-16-300 are specified for operation from -40°C to +70°C, with 10%–90% relative humidity under non-condensing conditions. Both specify an ingress-protection rating of at least IP65.

These ratings describe the antenna’s operating limits, not the weather limits of the complete aircraft or vehicle. Customers should also evaluate mounting, cooling, connectors, cable protection, and the host platform’s approved operating conditions.

7. Can CHREDSUN antennas work with an external GNSS receiver?

Yes, compatible configurations can provide processed RF signals to an external GNSS receiver. Selected products also incorporate a navigation receiver and provide positioning data through a digital interface.

RS-AJ-S-8-130 and RS-AJ-D-16-300 provide an SMA‑K RF output with a specified output level of -55 to -70 dBm and a 50 Ω impedance. Their receiver configurations also provide serial navigation output.

Before integration, confirm frequency coverage, input-level requirements, antenna-bias arrangements, connector compatibility, serial electrical levels, and supported data protocols. An SMA connection alone does not establish compatibility with every receiver.

8. Which GNSS constellations and frequency bands are supported?

Supported bands depend on the selected product. Customers should choose an antenna that matches both their receiver and the GNSS signals required by their application.

The single-frequency RS-AJ-S-8-130 and dual-frequency RS-AJ-D-16-300 therefore serve different integration requirements. Additional frequency options, where available, should be confirmed before ordering.

9. What features distinguish CHREDSUN’s higher-capacity GNSS protection models?

Higher-capacity models combine larger array architectures with interference mitigation, spoofing protection, and monitoring functions.

For example, RS-AJ-D-16-300 combines a dual-16-element array with GPS L1/L5, BDS B1I/B1C, and Galileo E1 reception. Its specification includes mitigation of up to 15 suppression interference sources, processing of up to eight spoofing sources, processed RF output, and real-time reporting of interference power, jammer count, and spoofing detection information.

These capabilities suit projects requiring more extensive GNSS protection, provided the platform can accommodate the antenna’s size, weight, power consumption, and cooling requirements.

10. Can a CHREDSUN antenna be integrated with a DJI Matrice M400 or another commercial UAV?

Integration must be evaluated for the exact UAV model, antenna model, and intended navigation architecture. Direct plug-and-play compatibility should not be assumed.

Before proposing an installation, we need to confirm:

• Whether the UAV provides access to an external GNSS RF input or supported navigation-data interface.

• Whether third-party navigation data can be used by its flight controller.

• Available supply voltage and power capacity.

• Payload, center-of-gravity, mounting, and cooling constraints.

• Manufacturer-approved integration methods and any effects on warranty or operating approval.

Please provide the UAV model and relevant interface documentation. We can then assess whether a direct receiver connection, supported external-data connection, or another integration approach is feasible. Pin assignments and wiring instructions will be provided for the confirmed CHREDSUN model—not inferred from another product.

11. How can CHREDSUN antennas support agricultural drone operations?

CHREDSUN GNSS protection antennas help reduce the effect of RF interference on the navigation input used for agricultural tasks such as crop monitoring, field mapping, spraying, spreading, and route following.

The aim is to improve navigation resilience, not to replace the flight controller, terrain-following sensors, obstacle detection, or precision-positioning system. Where repeatable or centimeter-level operation is required, compatibility with the platform’s RTK receiver and correction service must be evaluated.

For context, the built-in receiver specifications for RS-AJ-S-8-130 and RS-AJ-D-16-300 state horizontal accuracy of ≤7 m and vertical accuracy of ≤9 m at 95%, with PDOP ≤4; these figures should not be advertised as centimeter-level RTK performance.

12. Can an anti-jamming antenna solve tree obstruction, terrain blockage, or multipath?

Anti-jamming protection should not be presented as a universal solution to every GNSS problem.

CHREDSUN’s array processing is designed to mitigate specified interference conditions. The installation guidance for RS-AJ-S-8-130 and RS-AJ-D-16-300 still requires the receiving surface to face open sky without obstruction. If installed beneath a cover, the material above the antenna must provide at least 92% L-band transmission.

In orchards, mountainous terrain, or areas with dense structures, customers should combine suitable antenna placement with appropriate receiver technology, complementary navigation sensors, and safe operating procedures. Anti-jamming capability does not restore signals physically blocked by terrain or structures.

13. What should customers check before installing a CHREDSUN antenna?

Before installation, confirm the selected model’s:

• Power input range and operating power demand.

• Connector pinout and serial electrical levels.

• RF output characteristics and receiver compatibility.

• Mounting arrangement, weight, and platform load limits.

• Cooling requirements and unobstructed sky visibility.

• Data protocol and navigation-monitoring interfaces.

RS-AJ-S-8-130 and RS-AJ-D-16-300 use different power/data connectors and supply ranges. Both recommend airflow beneath the metal heat-dissipation base, making mechanical and thermal design part of the integration process.

Use the latest model-specific documentation and validate the complete system before deployment.

14. How can I choose the right CHREDSUN GNSS protection antenna?

Start with your application and operating environment. Tell us the platform type, required GNSS bands, expected interference conditions, installation space, payload allowance, power budget, and whether you need anti-spoofing capability.

Also confirm whether you want to retain an existing GNSS receiver or use an integrated receiver configuration. This helps identify a solution that balances navigation protection with practical integration requirements.

For product selection, technical discussions, or project inquiries, contact CHREDSUN by email or WhatsApp. Please include your platform details and intended civilian or commercial application so our team can review your requirements.