30results about How to "Avoid cross-coupling" patented technology

The invention belongs to the field of radar technologies and discloses a dual-polarization radar. The dual-polarization radar comprises a transmitting module, a receiving module, a receiving and transmitting switching module, a first polarization direction antenna and a second polarization direction antenna, wherein the transmitting module is used for generating a pulse pair signal, and the pulsepair signal comprises a first pulse signal and a second pulse signal with different radio frequencies; the receiving module is used for receiving backscattered echo signals of the first pulse signal and the second pulse signal; the receiving and transmitting switching module is used for transmitting the first pulse signal to the first polarization direction antenna, transmitting the second pulse signal to the second polarization direction antenna and transmitting a first polarization direction echo signal and a second polarization direction echo signal to the receiving module; the first polarization direction antenna is used for transmitting the first pulse signal and receiving the first polarization direction echo signal; and the second polarization direction antenna is used for transmitting the second polarization pulse signal and receiving the second polarization direction echo signal. Through the dual-polarization radar, an alternate sending, simultaneous receiving and single-receiving-channel radar structure is realized, and the dual-polarization radar has good echo signal correlativity and monitoring precision.

The invention discloses a triaxial integrated all-optical-fiber inertial sensing system, which comprises three optical fiber inertial sensing combined modules with vertical installation directions, wherein each module consists of a closed-loop optical fiber gyroscope and an accelerometer; a free port of a coupler in an optical path system of the optical fiber gyroscope is used as a light source input port of the optical fiber accelerometer so as to measure information of an angular speed and an acceleration of the same axial direction at the same time and realize one-dimensional inertial integration; meanwhile, the three axial optical fiber gyroscopes share a light source and a detector; the three gyroscopes adopt a multi-path multiplexing technology, so cross coupling is avoided; compared with the conventional all-optical-fiber sensing system, the triaxial integrated all-optical-fiber inertial sensing system has the advantages that: five light sources and two detectors are eliminated; furthermore, integration and minimization of the system, low cost and low power consumption are realized; and the stability and the reliability are improved.

A sensor switch including a first sensor electrode and a second sensor electrode at least partially surrounding the first sensor electrode. An evaluation and control circuit of the sensor switch is configured to generate a switch output signal if a first sensor electrode attenuation signal indicates a high signal attenuation, a second sensor electrode attenuation signal indicates a low signal attenuation, and a cross-coupling signal from the first to the second electrode indicates a low cross-coupling.

The invention discloses a navigation system for an underwater glider and an attitude angle correcting and backtracking decoupling method and belongs to the technical field of navigation positioning of the underwater gliders. The combined navigation system comprises a signal processing (DSP) module, a microelectromechanical systems (MEMS), an inertial measurement unit (IMU) and the like. By using pitching or transverse rolling motion, cross coupling of attitude angles (a course angle, a pitching angle and a transverse roll angle) is more obvious; by using the cross coupling among the attitude angles, the output of the attitude angles is inaccurate or even mistaken, and further the calculation of the subsequent speed, position and other navigation information is mistaken; the cross coupling among the attitude angles is eliminated by using an attitude angle backtracking decoupling method based on a backtracking decoupling idea. According to the system design, the demands of the navigation system of the underwater glider on low power consumption, small size and long endurance are met; according to the attitude angle backtracking decoupling method, the cross coupling among the attitude angles is effectively eliminated, the precision of the attitude angles is greatly improved, and the aims of long endurance, low power consumption and high-precision navigation positioning of the underwater glider are achieved.

A method for performing wireless communication, said method comprising the steps of: receiving at least one data stream sent from a wireless channel; in a first iteration, using a maximum likelihood estimator for said at least one Demapping is performed on at least a portion of the data stream to obtain a log-likelihood ratio of the first iteration, and turbo decoding is performed based on the log-likelihood ratio of the first iteration to obtain producing a final log-likelihood ratio for the first iteration; and in a particular iteration within at least one subsequent iteration of the first iteration, based on the final log-likelihood ratio for at least one previous iteration of the particular iteration Then, performing a demapping process on at least a portion of the at least one data stream using the maximum A back-convergence estimator to obtain the log-likelihood ratio for the particular iteration, and the log-likelihood ratio according to the particular iteration The likelihood ratios perform vortex decoding to produce the final log-likelihood ratios for that particular iteration.