6 results about "Reference antenna" patented technology

The present application relates to a kind of separation identification and monitoring method and system of radiation background noise, in separation identification and monitoring method, background noise and equipment emission signal are synchronously collected by multiple fixed reference antennas and main antenna, and time synchronization is realized by central synchronous unit.First, based on spectrum comparison, background noise probability is calculated, and first grade is filtered out;Second, baseline model is established according to reference antenna data, abnormal signal is identified and its source is judged, and burst background noise and equipment real emission are distinguished;Second grade is filtered out by using pre-stored feature library for matching identification;Finally, the comparison result of real emission signal and background noise after filtering is displayed on test interface, and the data exceeding the standard is automatically marked, test margin is calculated and conclusion is generated.Compared with prior art, the present application can effectively solve the technical problem that background noise and equipment signal are difficult to separate in real time and accurately in complex electromagnetic environment, and the reliability and efficiency of radiation test are significantly improved.

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.

This disclosure provides an antenna testing system and method, relating to the field of antenna technology. The testing system includes a voltage loading device, the output of which is connected to the input of a phased array antenna; a field testing system for testing the antenna parameters of the phased array antenna; and a computer device, the output of which is connected to the voltage loading device, and the input of which is connected to the field testing system. In real-time mode, this disclosure allows for the pre-testing of the target loading voltage corresponding to the phased array antenna when its performance most closely approximates the reference antenna parameters during beam radiation. Since the tested target loading voltage is obtained through actual testing using the field testing system, the accuracy of the tested target loading voltage is guaranteed, thus ensuring the antenna performance of the phased array antenna in subsequent use.

The application relates to the technical field of millimeter wave radars, and discloses an array channel correction method of a millimeter wave radar, which solves the problem of high cost of array channel correction of an existing millimeter wave radar, and mainly comprises the following steps: obtaining radar echo data of each receiving channel of a to-be-corrected array antenna under multiple rotation angles, and extracting measurement phase values of each receiving channel under each rotation angle according to the radar echo data; for each measurement phase value, a corresponding reference antenna is selected, and the reference antenna is dephased to obtain a target measurement phase value; the target measurement phase values of all rotation angles under each receiving channel are traversed, and the target measurement phase values corresponding to the rotation angles of phase value outliers are removed; theoretical phase values of each receiving channel under each rotation angle are calculated, and phase correction values of each receiving channel are determined according to the theoretical phase values and the target measurement phase values; and the spectrum data of each receiving channel are phase-corrected according to the phase correction values. The application reduces the phase correction cost.

This disclosure relates to 5G or 6G communication systems for supporting higher data transmission rates. A method performed by a user equipment (UE) includes: receiving information about a report, the information indicating an antenna group; determining a reference antenna group based on the information; and determining a first delay value and a second delay value for each antenna group based on the information and the reference antenna group. The method further includes: sending the report, the report including a first indicator indicating the reference antenna group, a second indicator indicating the interval to which the first delay value belongs for each antenna group, and a third indicator for each antenna group indicating whether the second delay value is within or outside a predefined range via a 1-bit indicator.

The application discloses a space-based external emitter ground-based synthetic aperture radar far-field pseudo-polar imaging method. The method firstly performs Fourier transform on time-domain signals received by monitoring antennas and reference antennas at different positions, performs conjugate multiplication in the frequency domain, and obtains target echo signals; distance dimension and azimuth dimension of the signals are decoupled; Taylor expansion order is determined according to imaging accuracy and efficiency requirements, and redundant phase terms generated after decoupling are Taylor expanded; decoupled echo signals after compensation under different orders are respectively subjected to two-dimensional fast Fourier transform, so that distance compression and azimuth focusing results are obtained; the results of different orders are accumulated and summed, so that a pseudo-polar coordinate system image is obtained; finally, the pseudo-polar coordinate image is converted into a rectangular coordinate, and a two-dimensional imaging result is output. The application can effectively realize balance between imaging accuracy and efficiency of the space-based external emitter ground-based synthetic aperture radar, and quickly obtain a high-resolution SAR image.