Techniques are described for the exchange of control signals between a controlled unmanned aircraft (i.e. drone) and a ground control station and for the transmission of communication signals, such as video, from the drone to the ground control station so that the signals are more difficult to intercept or jam. The video signal transmitted from the drone can be an analog RF signal employing one or more of video scrambling, RF signal inversion, hopping, usage of a wide frequency range and other techniques. To secure the control signals between the drone and the ground control station, techniques can include hopping, encryption and use of a wide frequency range.

Control systems and methods to secure communications within the control system. The control system includes a control node operably coupled to a concentrator node via a first data link. The control node can communicate with the concentrator node over the first data link at a first communication frequency and first communication rate. The control node can also change the first communication frequency in response to an event, such as a cyber-security threat. The concentrator node can communicate with the control node at the changed first communication frequency in response to receiving a frequency change indication. In some examples, the control node is also operably coupled to the concentrator node via a second data link. The second data link may operate at a second communication rate that is different from the first communication rate. The control node may send redundant data on the first data link and the second data link.

A weight switching unit outputs weights for modulation signals so that, on a constellation diagram in the complex plane, a position of a signal point in a communication direction corresponds to that of the modulation symbol, and the position of the signal point in a non-communication direction becomes different from that of the signal point in the communication direction. Weight applying units apply, to the modulation signals emitted from antennas, weights for each modulation symbol output from the weight switching unit.

The present invention includes various novel systems and methods for communication in a network. A System Environment Monitor is employed in some embodiments to extract from the network both real-time and historical Network Metrics at the Infrastructure Layer, as well as Application Metadata at the Application Layer. Network analytics facilitate decisions based upon the differing characteristics of Application Components and lower-level hardware components across multiple DTTs. In response, an SDN Controller generates modified sets of SDN Flows, and implements them in real time across a mixed technology (multi-DTT) network in a manner that avoids disrupting existing SDN Flows and other real-time network traffic.

The present disclosure relates to a communication method related with channel width agile. The method uses a channel generation circuit at a signal transmitting end to generate a channel whose channel width can be changed according to a certain law, and a channel detection circuit at a signal receiving end corresponding thereto to detect the corresponding channel width by the same channel width agile law, thereby achieving the secure reception of the signal. Due to the agility of the channel width, communication security is ensured, and it does not conflict with other technologies (such as frequency hopping), and the channel width can be dynamically allocated. In this way, the advantages of high security, compatibility, and high spectrum utilization can be achieved. Meanwhile, the method realizes the maximum possible optimization of the channel and is very creative.

In some examples, a system includes a propulsor engine and a controller configured to determine a frequency for a new communication session on a communication channel based on a frequency of a previous communication session, wherein the frequency for the new communication session is different than the frequency of the previous communication session. In some examples, the controller is further configured to establish the new communication session via the communication channel with the propulsor engine. In some examples, the controller is also configured to exchange information with the propulsor engine at the frequency for the new communication session via the communication channel.

A weight switching unit outputs weights for modulation signals so that, on a constellation diagram in the complex plane, a position of a signal point in a communication direction corresponds to that of the modulation symbol, and the position of the signal point in a non-communication direction becomes different from that of the signal point in the communication direction. Weight applying units apply, to the modulation signals emitted from antennas, weights for each modulation symbol output from the weight switching unit.

A method for variable length decoding, the method including: receiving, in a default word length mode, at least one first data word having a default first word length; combining the received at least one first data word as a first portion of data; receiving, after the at least one first data word, a transition word indicative of transitioning to a variable word length mode; receiving, after the transition word, a first word length word indicative of a second word length; receiving, after the first word length word, at least one second data word having the second word length; and combining the received at least one second data word as a second portion of the data.

Control systems and methods to secure communications within the control system. The control system includes a control node operably coupled to a concentrator node via a first data link. The control node can communicate with the concentrator node over the first data link at a first communication frequency and first communication rate. The control node can also change the first communication frequency in response to an event, such as a cyber-security threat. The concentrator node can communicate with the control node at the changed first communication frequency in response to receiving a frequency change indication. In some examples, the control node is also operably coupled to the concentrator node via a second data link. The second data link may operate at a second communication rate that is different from the first communication rate. The control node may send redundant data on the first data link and the second data link.

The present disclosure relates to a communication method related with channel width agile. The method uses a channel generation circuit at a signal transmitting end to generate a channel whose channel width can be changed according to a certain law, and a channel detection circuit at a signal receiving end corresponding thereto to detect the corresponding channel width by the same channel width agile law, thereby achieving the secure reception of the signal. Due to the agility of the channel width, communication security is ensured, and it does not conflict with other technologies (such as frequency hopping), and the channel width can be dynamically allocated. In this way, the advantages of high security, compatibility, and high spectrum utilization can be achieved. Meanwhile, the method realizes the maximum possible optimization of the channel and is very creative.