31results about How to "Guaranteed Time Synchronization" patented technology

An Ethernet bus system used for launch vehicles, including a telemetry module, a data interpretation and voting module, a time synchronizer, a plurality of sensors, an A Ethernet bus and a B Ethernet bus that are mutually hot backup. The time synchronizer is used to ensure the time synchronization of A and B Ethernet buses. The bus terminals of the A Ethernet bus and the B Ethernet bus are connected to the sensor, and the data of the sensor is collected according to a fixed cycle, and the data and the collection time information are stored in the data buffer area; the A Ethernet bus and the B Ethernet bus respectively store the collected data Compile telemetry data frames and send them to the data interpretation and voting module; the data interpretation and voting module interprets two sets of telemetry data frames, and uploads the telemetry data frames without exception to the telemetry module; the telemetry module modulates the received telemetry data frames and then sent to the ground receiving equipment. The invention can ensure time synchronization and real-time performance, improve system reliability and meet the use requirements of launch vehicles.

The invention discloses a multi-base cooperative radio detection system and a detection method. The system transmits FM step signal and communication data to the slave base station through the master base station. Obtain the first clock signal from the communication data from the base station, adjust the local clock signal according to the first clock signal to obtain the second clock signal, determine the first receiving time of the frequency modulation step signal transmitted by the main base station based on the second clock signal, and detect The second receiving time of the reflected FM stepping signal reflected by the target; the first receiving time and the second receiving time are used as detection information, and are sent to the main base station through the Ethernet. The main base station uses the time difference positioning method to determine the location information of the detection target based on the detection information, ensuring the time synchronization of the radio detection devices at multiple points, thereby improving the distance accuracy; improving the multi-pulse accumulation effect of the radio detection devices at multiple base stations, thereby improving detection distance capability.

The present invention relates to a method and system for abnormality detection of a secondary measurement circuit in a substation and a switching station. The method includes: correcting the time of the terminal equipment corresponding to the switch on the bus, and obtaining the three times of the terminal equipment corresponding to the switch with a time mark. Phase voltage, use the three-phase voltage of the terminal equipment corresponding to the switch with the same time mark to detect the abnormality of the busbar, the secondary measurement circuit of the voltage transformer of the switch on the busbar and the secondary measurement circuit of the current transformer of the switch on the busbar, adopt The above-mentioned technical solution can quickly detect the abnormal situation of the secondary measurement of the substation and the switch station, and effectively improve the detection sensitivity.

The invention discloses a method and system for measuring the focal spot of a high-power laser cluster far-field combination. technical problem. The measurement system of the present invention includes a sampling mirror group, a collimating negative lens group, a first attenuation mirror group, a magnifying mirror group and a CCD which are sequentially arranged along the optical path; Sampling mirror Ⅱ and sampling mirror Ⅰ respectively equipped with light holes; both sampling mirror Ⅱ and sampling mirror Ⅰ are parabolic mirrors, and the concave surfaces of the two are opposite; the collimating negative lens group is used to collimate the sampled beam Carry out beam reduction and collimation; the first attenuation lens group contains at least two attenuation sheets, and the angle between the normal of each attenuation sheet and the beam is θ, 10°<θ<20°; the magnifying lens group is used to adjust the attenuation The beam after amplification is enlarged; CCD is used to acquire the image of the beam after amplification.

The invention relates to a method for testing satellite-earth time synchronization in a satellite semi-physical simulation test. The method comprises the following steps: S1, establishing a satellite dynamics simulation model, and operating the satellite dynamics simulation model in a satellite dynamics simulation computer; S2, generating a synchronous second pulse signal, and separately sending the synchronous second pulse signal to an on-board computer and the satellite dynamics simulation computer; S3, receiving, by the satellite dynamics simulation model, a time signal sent by the on-board computer in real time, comparing the time signal with a time signal corresponding to the second pulse signal, taking the time signal sent by the on-board computer as an orbit calculation time after a judgment is correct, and obtaining a satellite attitude quaternion through calculation; and S4, adopting a star sensor electrical signal source to receive the satellite attitude quaternion sent by the satellite dynamics simulation computer, simulation in-orbit star sky, transmitting the simulated in-orbit star sky to a star sensor, and then forming closed-loop control with the on-board computer through the star sensor. A time delay in data transmission can be reduced, time synchronization between the on-board computer and the ground satellite dynamics simulation computer is guaranteed, and test precision of a satellite control system is improved.

The invention discloses a synchronous playback method. When receiving a synchronous playback request message from a receiver, a server sends the synchronous playback request message to specific sender; a specific field in the synchronous playback request message includes identifiers of front-end devices which need synchronous playback, and the specific sender stores video monitoring data of the front-end devices, so that the server establishes a session between the receiver and the specific sender via session configuration information of the sender, and then the receiver can receive the video monitoring data corresponding to the front-end devices synchronously via the session; and thus, required preparation time for synchronous playback of the front-end devices is reduced, and it is ensured that videos are played back synchronously.

The present invention relates to a multi-system synchronization method for on-board feed-forward torque compensation in the field of overall satellite technology, including step 1: taking the time T of a digital tube computer as a standard time reference, using the on-board time to control attitude and orbit, scan imaging load, step The time system of the imaging load is uniformly calibrated; Step 2: The digital tube computer uniformly receives and distributes the work instructions sent by the ground; Step 3: The attitude and orbit control system starts the feedforward torque compensation operation for the scanning imaging load and the stepping imaging load. , during the compensation process, the feedforward compensation is continuously synchronized with the pointing, scanning and stepping of multiple loads; Step 4: After the attitude and orbit control system completes a command compensation operation according to the agreed rules, the attitude and orbit control system stops the compensation and waits for the next command. instruction. The invention can ensure the synchronism of the compensation moment and the load work, and guarantee the realization of the high-precision index of the satellite.

The present invention relates to the technical field of network live broadcasting, in particular to a method for controlling push of video streams in a live broadcasting room, a corresponding server and a mobile terminal. The method includes the steps of: receiving a connection request from the first terminal initiated by the anchor user of the live broadcast room and including the pre-agreement information output by the second terminal; responding to the connection request, uploading the received first terminal Sending the live video stream to the second terminal; receiving the third live video stream uploaded by the second terminal and combining at least one of the second live video stream and the first live video stream, and pushing it to the live video stream between member users. The present invention realizes multi-platform synchronous live broadcast based on video stream separation and merging as a technical basis, and realizes sharing and flexible combination of video streams, makes multi-platform live broadcast more convenient and fast, improves live broadcast efficiency, improves live broadcast content, and further improves user experience.