2 results about "Bandwidth efficient" patented technology

The scheme discloses a POS machine miniaturization large-bandwidth high-efficiency antenna, which uses a small antenna size to excite a low-frequency working mode of a mainboard, uses components such as a camera FPC and an NFC coil which are not conducive to the antenna to expand the frequency, realizes better low-frequency bandwidth, changes the disadvantage into an advantage, optimizes the shape of the antenna working at a high frequency and places the antenna at a suitable position to excite the NFC coil and the rear camera FPC to generate a low-frequency resonance, thereby expanding the antenna bandwidth to a low frequency enough to cover common low-frequency communication frequency bands, and finally realizes a very small space-occupied and very high-efficiency large-bandwidth antenna.

This invention provides a networked radar decision-making method based on an improved MADDPG, which balances resolution and anti-interference performance, and relates to the field of radar anti-interference technology. First, an adversarial scenario is constructed between the networked radar and a multi-point broadband frequency-sweeping jammer, signal distribution is analyzed, and overlap coefficients are established. Second, the radar cooperative scheduling process is modeled as a multi-agent partially observable Markov decision process, constructing a composite reward function that balances detection resolution and anti-interference performance. Then, a multi-agent deep deterministic policy gradient algorithm is used for network training, and a self-attention mechanism is introduced in the value evaluation to extract mutual interference topology features, obtaining the frequency agility strategy for each radar. This invention overcomes the limitations of traditional discrete frequency hopping, enabling the radar to adaptively utilize fragmented spectrum to elastically expand bandwidth under conditions of no online communication, effectively achieving a comprehensive improvement in high-precision detection and high anti-interference survivability.