54results about How to "Increase receive gain" patented technology

An ultrasonic diagnostic apparatus is provided. The ultrasonic diagnostic apparatus includes an ultrasonic probe having plural ultrasonic transducers arranged in an elevation direction, a beamformer configured to form an ultrasonic reception beam by performing delay addition to an echo signal received by each of the ultrasonic transducers, and configured to form plural ultrasonic reception beams, each ultrasonic reception beam having a different width in the elevation direction, wherein the beamformer is configured to form the plural ultrasonic reception beams for one transmission / reception surface by adjusting a delay time in the delay addition, and a display control unit configured to display a synthetic image formed based upon the plural ultrasonic reception beams.

The embodiment of the invention discloses an antenna system, which includes an integrated transceiver active antenna, a radio frequency cable feed unit, power supply equipment and the like. The space diversity active antenna system uses space diversity reception to increase the uplink reception gain, coupled with uplink active amplification, further improves the uplink reception, thereby greatly improving the uplink and making the uplink and downlink balance, It is beneficial to give full play to the performance of the base station, improve the coverage of the base station, and improve the performance of the base station system. Moreover, the space-diversity active antenna adopts an integrated design, integrating the active part into the antenna, which is consistent with the traditional passive antenna in appearance, and adopts the technology of RF cable feeding without external power lines, so it is suitable for construction applications. It's quite convenient.

The invention belongs to the technical field of communication signal modulation recognition in a multi-sensor non-cooperative reception environment and particularly relates to a maximum likelihood modulation recognition method based on feature vectors in multi-sensor reception. The method comprises the following steps that step 1.each sensor sub-node estimates a signal-to-noise ratio, extracts modulation recognition features and configures recognition feature vectors according to respective receiving signals; step 2.a likelihood function based on the recognition feature vectors is configured on a major node; and step 3.maximum likelihood judgement is carried out in a to-be-recognized signal modulation type set at the major node according to the configured likelihood function, so that a recognition result is obtained. The method adopts the multi-sensor reception signals, extracts the recognition feature vectors and designs a classifier, so that the problems of accuracy and reliability of the communication signal modulation recognition under the band conditions in a mobile communication, short-wave communication or underwater acoustic communication process are solved.

The present invention provides an electronic device and a control method for the electronic device. The electronic device includes: an electronic device body and a telescopic structure disposed inside the electronic device body; a radio frequency transceiver; a first antenna disposed on the telescopic structure, and a radio frequency transceiver A first transmission and reception path is formed between the first antenna; a first switch, the first switch is set in the first transmission and reception path; wherein, when the telescopic structure is moved out of the electronic device body, the first switch turns on the first transmission Receiving path: when the retractable structure moves into the body of the electronic device, the first switch disconnects the first transmitting and receiving path. The present invention can reduce the difficulty of antenna design, and the first antenna has different working states when the telescopic structure is in different positions, and can reduce the receiving interference of the first antenna, thereby improving the receiving gain of the antenna and improving the efficiency of the antenna for transmitting signals. Make it better to receive the signal.

The invention provides an elastic wave through-the-earth signal diversity reception method, and relates to diversity reception technology applied in the fields of exploration and through-the-earth communication. In the method, signals dispersed at each frequency point and in each transmission mode are organically fused together at an earth channel receiving end by adopting a way of multi-mode reception and multi-frequency point reception diversity, so the signal-to-noise (SNIR) of the receiving end is improved. When elastic waves are transmitted in an earth medium, the transmission mode of the elastic waves is changed, while frequency is shifted under the influence of the piezoelectric effect, waveguiding effect and resonant cavity effect of the earth medium. The method provided by the invention has the advantages of improving reception gain by collecting signal energy dispersed in each mode and at each frequency point, and suppressing the attenuation of the elastic waves in the earthmedium by the diversity combination of multi-mode and multi-frequency information to finally fulfill the aim of improving the detection performance of a receiver.

The present invention provides a satellite communication signal processing method, device, electronic equipment and medium. The method applied to ground terminals includes: receiving satellite pilot signals, extracting uplink working frequency bands; Frequency hopping uplink service signal; send frequency hopping uplink service signal to the satellite terminal according to the uplink working frequency band, so that the satellite terminal can de-hop the frequency hopping uplink service signal according to the frequency hopping pattern of the satellite terminal, obtain the de-hopping signal and send it to the gateway The restored local information decoded by the station is used as a signal processing result; the frequency hopping pattern of the ground terminal corresponds to the frequency hopping pattern of the satellite terminal. The present invention is applicable to the multi-satellite cooperative emergency communication system, and can increase the receiving gain and improve the reliability of the uplink during the communication process, especially the communication process under harsh conditions, and at the same time alleviate the terminal communication capability requirements and load storage pressure, and reduce the Hardware resource consumption.