UAV Ground End Frequency Detection for Stable Data Transmission
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Solution Overview
Problem
The stability of wireless transmission links between unmanned aerial vehicles (UAVs) and the ground end is compromised due to external signal interference, affecting data transmission quality.
Innovation Solution
A method involving the transmission of pilot signals on multiple frequency bands (2.4 GHz, 900 MHz, and 5.8 GHz) to determine optimal operating frequencies based on signal-to-noise ratios, allowing for feedback signals to adjust the communication frequencies and improve link stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-band or dual-band wireless transmission link is used for data transmission between UAV and ground end, then the device complexity is reduced, but the stability of wireless transmission link deteriorates due to external signal interference
Solution Approach 1:
The patent applies preliminary action by performing frequency detection and noise measurement in advance before actual data transmission. The ground end detects multiple candidate frequencies and identifies the optimal frequency beforehand, then sends frequency hopping information to the UAV. This preliminary frequency selection process ensures that the transmission link is established on the least interfered frequency, improving stability without adding complex real-time detection systems during transmission.
Solution Approach 2:
The patent implements feedback by having the ground end send frequency hopping information back to the UAV after detecting the optimal frequency. The UAV receives this feedback and adjusts its transmission frequency accordingly. This feedback mechanism enables both ends to synchronize on the optimal frequency, resolving the contradiction between maintaining simple device architecture and achieving stable transmission under interference.
2Reliability
If frequency hopping is performed to avoid interference, then the stability of data transmission is improved, but the loss of time increases due to checking and noise measurement
Solution Approach 1:
The patent applies partial action by performing noise measurement and detection on only a limited set of preset candidate frequencies rather than scanning the entire frequency spectrum. The ground end checks a predefined subset of frequencies (e.g., 2.4 GHz, 5.8 GHz, 900 MHz bands) to identify the optimal one. This partial detection approach reduces the time required compared to exhaustive scanning while still achieving stable transmission by selecting from adequate candidate frequencies.
3Adaptability or versatility
If multiple frequency bands are used for pilot signal transmission, then the adaptability of the system is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the ground end with a multi-functional frequency detection capability that can operate across multiple frequency bands (2.4 GHz, 5.8 GHz, 900 MHz). The same detection apparatus handles all bands, and the system universally selects the optimal frequency regardless of which band it belongs to. This multi-functional design provides adaptability across bands without proportionally increasing complexity, as the detection mechanism is reused across different frequency ranges.
Data Source
AI summary
The present invention provides a data transmission method, apparatus and system. The method includes: in a detection period, receiving a first pilot signal sent by an unmanned aerial vehicle (UAV), the first pilot signal being a downlink signal obtained by modulating a useful signal at a preset candidate frequency, and the preset candidate frequency including a frequency in a same frequency band and/or different frequency bands; determining a downlink operating frequency from the preset candidate frequency according to the first pilot signal; sending a first feedback signal to the UAV, the first feedback signal including information about the downlink operating frequency; and receiving downlink data sent by the UAV and modulated at the downlink operating frequency. In this way, frequency detection in a same frequency band and/or across frequency bands is implemented to select an optimal preset candidate frequency as an operating frequency, so that data transmission between a UAV and a remote control is more stable, interference from an external signal is reduced, and quality of data transmission between the UAV and a ground end is improved.