2results about How to "Difficult to achieve" patented technology

This invention relates to electromagnetic logging technology and discloses a forward-focusing electromagnetic logging method while drilling, comprising two stages: (1) Pre-testing stage: using a magnetic ring antenna array arranged in a straight line along the drill collar, the last antenna is used as a reference antenna to transmit signals, and the preceding antennas simultaneously receive them, so as to synchronously acquire the amplitude and phase delay of the received signals of each preceding antenna. (2) Forward focusing stage: configuring the transmission parameters for the preceding antennas, setting their initial phase to the negative value of the measured phase delay, and calculating an inversely proportional weighting coefficient based on the received amplitude, thereby configuring the driving amplitude of each preceding antenna; finally, driving the reference antenna and the configured preceding antennas to transmit synchronously, and coherently superimposing them in front of the drill bit to form a focused beam, while weakening the signal interference from the instrument's sides and back to the formation. This invention does not require pre-setting equipment in un-drilled formations, is fully compatible with existing instruments, and can significantly improve the signal strength and signal-to-noise ratio of forward detection.

The invention relates to the technical field of electronic upgrading, and discloses a data transmission anomaly detection method and system, a vehicle and a readable storage medium, a vehicle-mounted terminal sends an upgrading data packet to an electronic controller, the electronic controller responds to the upgrading data packet sent by the vehicle-mounted terminal and sends an encrypted information reply request to the vehicle-mounted terminal, and the electronic controller sends the encrypted information reply request to the vehicle-mounted terminal. The vehicle-mounted terminal receives the encrypted information reply request sent by the electronic controller, decrypts the encrypted information and then sends an information decryption response to the electronic controller, the electronic controller records a second moment when the information decryption response sent by the vehicle-mounted terminal is received, and the electronic controller sends the information decryption response to the vehicle-mounted terminal. And the time difference between the second moment and the first moment is calculated, and if the time difference is greater than the preset time difference threshold, it is determined that data transmission is abnormal, so that it can be ensured that the received data comes from a correct OTA initiator, and the safety of the electronic controller is ensured.