anti jamming radio for drone

A client asks us to offer the anti jamming radio for his drone.

An anti-jamming radio is a communication system designed to resist or mitigate interference (jamming) from external sources, ensuring reliable and uninterrupted communication. Jamming is the deliberate or unintentional disruption of radio signals, which can render a communication system ineffective. Anti-jamming radios are critical in applications where reliable communication is essential, such as in military operations, drone control, aviation, and critical infrastructure.

For the anti-jamming data radio link of drones, we mainly classify it according to one-way transmission and two-way transmission, and offer different options and solutions.

If it is a two-way transmission, our solution is to provide a wider frequency range, tulad ng Vcan1988, which provides 1300~1500 MHz, with a frequency range of 200Mhz, at TX900 can also provide 1420-1530Mhz, with a frequency range of 110Mhz. When the signal is interfered with and the SNR sensitivity becomes low, the system will automatically select the frequency with the strongest current signal, for example, automatically hopping from 1300Mhz to 1500Mhz at the same time.

If the customer wants to use the cofdm one-way transmission system, but also wants the drone’s data link to be resistant to interference, our strategy is to use different frequencies for the uplink and downlink.

This ensures that even if there is a drone anti-gun on the ground that interferes with the drone’s downlink and the video download is interfered with, the drone operator can still use different frequencies to control the drone to fly to a safe area or return smoothly.

Our 1816 module can achieve uplink and downlink using different frequencies. Of course, we can also add power amplifiers, filters and antennas to make a finished anti-interference drone data link or repeater for you.

How Anti-Jamming Radios Work

Anti-jamming radios use a combination of hardware and software techniques to maintain communication integrity in the presence of interference. Here are the key methods they employ:

  1. Frequency Hopping Spread Spectrum (FHSS):
    • The radio rapidly switches frequencies within a predefined band during transmission.
    • Even if a jammer disrupts one frequency, the radio quickly moves to another, making it difficult for the jammer to block the entire signal.
    • FHSS is only suitable for two-way drone data links, because the receiver of a one-way drone data link cannot feedback the current SNR to the drone transmitter and adjust the operating frequency at the same time when it detects a weak signal from the drone transmitter.
  2. Direct Sequence Spread Spectrum (DSSS):
    • The signal is spread over a wider bandwidth using a unique code.
    • This makes the signal appear as background noise to a jammer, which cannot easily disrupt the entire spread signal.
  3. Orthogonal Frequency-Division Multiplexing (OFDM):
    • The signal is divided into multiple smaller sub-signals transmitted simultaneously at different frequencies.
    • If one frequency is jammed, the others can still carry the data.
  4. Beamforming and Mga Direksyon ng Antennas:
    • The radio focuses its signal in a specific direction, reducing the likelihood of interference from other directions.
    • This is particularly useful for long-range communication.
    • Currently there is a product that combines a directional antenna and an omnidirectional antenna in one, which is very useful when your receiver is a dual-channel diversity receiver.
    • The directional antenna can automatically adjust the direction of the directional antenna to always point to the position of the drone, we call it automatic antenna tracker. And there is also a manual adjustment of the direction and angle of the directional antenna. It is suitable for users with limited economic budgets. Video at https://youtu.be/egMqAVlDYyo
  5. Error Correction and Redundancy:
    • Advanced error correction algorithms (Hal., Pasulong na pagwawasto ng error) are used to detect and correct errors caused by interference.
    • Redundant data transmission ensures that even if part of the signal is lost, the message can still be reconstructed.
  6. Encryption and Authentication:
    • Encrypted signals are harder to jam or spoof, as the jammer cannot easily interpret or replicate the signal.
    • Authentication ensures that only authorized devices can communicate with the radio.
    • Our two-way and one-way drone systems already support digital AES128 for encryption and decryption.
    • We also have analog video scrambling modules and descrambling modules for FPV drones. Vcan2028.
  7. Adaptive Power Control:
    • The radio adjusts its transmission power dynamically to overcome interference or maintain a strong signal-to-noise ratio.

Applications of Anti-Jamming Radios

Anti-jamming radios are used in environments where communication reliability is critical:

  • Military and Defense: Secure communication in contested or hostile environments.
  • Drones and UAVs: Ensuring control and telemetry links remain intact, even in areas with heavy interference.
  • Aviation: Protecting communication and navigation systems from interference.
  • Critical Infrastructure: Safeguarding communication in power grids, transportasyon, and emergency services.
  • Space and Satellite Communication: Maintaining links in environments with high levels of interference.

Key Features of Anti-Jamming Radios

  • Resistance to Interference: Ability to operate in environments with high levels of electromagnetic noise or deliberate jamming.
  • High Reliability: Ensures continuous communication even under adverse conditions.
  • Long Range: Capable of maintaining strong signals over long distances.
  • Mababang latency: Minimal delay in communication, crucial for real-time applications like drone control.
  • Secure Communication: Encryption and authentication to prevent unauthorized access or spoofing.

Examples of Anti-Jamming Technologies

  1. GPS Anti-Jamming:
    • Protects GPS signals from being jammed, ensuring accurate positioning and navigation.
    • Used in military drones, aircraft, and vehicles.
  2. Military Tactical Radios:
    • Radios like the AN/PRC-117G o AN/PRC-158 use advanced anti-jamming techniques for secure battlefield communication.
  3. Drone Communication Systems:
    • Systems like DJI OcuSync o TBS Crossfire use FHSS and other techniques to ensure reliable control and video transmission.
  4. Satellite Communication:
    • Anti-jamming systems protect satellite links from ground-based or space-based interference.

Why Anti-Jamming Radios Are Important

In today’s world, where wireless communication is ubiquitous, the risk of interference—whether accidental or intentional—is high. Anti-jamming radios ensure that critical systems remain operational, even in the presence of interference. This is especially important for drones, where losing control due to jamming could lead to accidents, data loss, or security breaches.

If you’re looking for an anti-jamming radio for your drone, consider the operating environment, range requirements, and the level of interference you expect to encounter.




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