31 results about "Effective radiated power" patented technology

An active antenna is provided that includes an antenna element for transmitting RF transmit signals at a predetermined effective radiated power (ERP). An antenna module is configured to be mounted to an aircraft, with the antenna element being mounted to the antenna module. A connector module is provided at the antenna module and is configured to be coupled to a communications link and receive electrical transmit signals from the communications link. A transmit path is provided within the antenna module and extends between the antenna element and the connector module. A power amplifier is provided on the antenna module along the transmit path. The power amplifier increases a power level of the electrical transmit signals, received from the communications link, by a predetermined amount sufficient to drive the antenna element to transmit the RF transmit signals at the predetermined ERP.

Data rate allocation decisions are made for a communications channel, such as a wireless reverse link connection. A first parameter used in this determination is a path loss, which is determined by the following process. First, a message is sent from a first station to a second station, such as on a paging channel. The message indicates a forward Effective Radiated Power (ERP) of a pilot signal transmitted by the first station. The second station then determines the received signal strength of this pilot signal, taking into account receiver gains. The path loss can then be estimated by the second station as the difference between the forward ERP data value that it received and the detected received pilot power. The second station also then preferably determines a transmit power level when transmitting a message back to the first station. This transmit power level information is encoded as a digital data word together with the forward path loss information as calculated by the first station. Upon receipt of these two pieces of information by the first station, the forward path loss estimate as calculated by the second station, and the output power value of the second station, the first station can then determine the amount of excess power available at the field unit. This excess power difference is indicative of the amount of dynamic range available in the transmit power amplifier in the particular second station. With this information, the first station can then make a determination as to whether coding rates which require a higher dynamic range will be acceptable for use by the particular second station.

A wireless communication network can reliably deliver high priority broadcast information from base stations to mobile terminals located deep in building and those located in scarcely populated areas that are remote from the base stations. Each of the base stations of the wireless communication network comprises a broadcast information input unit for receiving high priority broadcast information and a transmission power changing unit for changing the transmission power of the downlink common channel when high priority broadcast information is input to it. As broadcast information is input, the transmission power changing unit changes the transmission power of the downlink common channel so as to boost the effective radiation power used by the downlink common channel of the base station at places in the coverage of the base station that are subjected to a propagation loss. The effective radiation power to the mobile terminals located at places in the coverage of the base station that are subjected to propagation loss is boosted to raise the reception level of the mobile terminals located at such places.

A terminal antenna total radiated power (TRP) fast testing method is used for testing radiation performance of a terminal antenna in an over-the-air (OTA) darkroom test. A terminal placed on a darkroom turntable takes every antenna polarization direction with a certain theta angle and a certain phi angle as a testing point to test the power of a certain channel so as to obtain the effective radiated power (ERP) of a corresponding point and then generates a transmitting power strength directional diagram. The antenna polarization direction at the best theta angle and the best phi angle is sought according to the transmitting power strength directional diagram and the ERP<CH1> of a channel to be tested is measured. All the ERP<CH1> values are subjected to integrated computation and the TRP of the terminal antenna is obtained. The method simplifies the generating process of the ERP in two antenna polarization directions at each theta angle and each phi angle of the turntable, corrects the test result to enable the test result to be more accurate, promotes the measuring efficiency of the TRP due to simplifying of the algorithm and reduces testing cost.

Antennas used aboard aircraft to communicate with satellites or ground stations may have complex antenna patterns, which may vary as the aircraft moves throughout a given coverage area. Techniques are disclosed for dynamically adjusting the instantaneous power fed to an antenna system to ensure that the antenna transmits at the regulatory or coordinated effective isotropic radiated power (EIRP) spectral limit. The antenna may transmit, in accordance with aircraft location and attitude, steerable beam patterns at different scan and skew angle combinations, causing variations in antenna gain and fluctuations in the transmitted EIRP. Using on-board navigational data, an antenna gain and ESD limit may be calculated for a particular scan and skew angle, which may be used to adjust power fed to the antenna such that the antenna transmits substantially at maximum allowable EIRP as the steerable beam pattern is adjusted.

The method picks up data needed for correcting model by using data of tested forward received power in test data of actual network. Treating data includes following steps: accounting information of latitude and longitude of transmitting site in each subzone within network, transmitting power and antenna parameter of each subzone; calculating effective radiated power in each direction for each subzone, and distance between test point and transmitting site in each subzone; fitting of multielement non-linear regression method is utilized so as to obtain parameters of propagation model. Comparing with prior art, the invention uses tested data to correct model, omitting a series of works such as selecting station site, erecting antenna, driving cars for testing etc. The invention saves time, raises work efficiency providing model with high precision, and good portability.

The invention provides a configurable multiple-valued matching field analysis method. According to the method, field association rules can be flexibly set; according to the set field association rules, the data is automatically checked when being imported, and whether the input data has error or not can be checked; if the data has error, prompt is carried out, so that the data wanted by a user can be accurately imported. The configurable multiple-valued matching field analysis method can be applied to an import facility of an effective radiated power (ERP) product, and is suitable for importing some special fields having multiple-valued matching conditions. After the special rules are set, the unique value can be determined when the multiple-valued matching field is imported, so that the accuracy of the imported data can be guaranteed.

An antenna design, having two symmetrical phased array blade antenna elements which provide improved lateral target coverage with an increased effective radiated power and exhibits smooth null-free unidirectional antenna patterns. The direction of the unidirectional antenna pattern is dictated by a switching command under control of a user. Each blade antenna element is coupled to a 90-degree hybrid coupler and an RF switching device by a semi-rigid RF cable. Each blade antenna element is also connected to a sub-resonant choke balun for improved impedance matching and resultant distortion-less antenna patterns.

A method for analyzing the working performance of a damaged satellite-to-ground data transmission antenna, (1) calculate the satellite effective transmission power EIRP according to the satellite transmitter output power, satellite antenna gain and transmission channel loss; (2) calculate the satellite effective transmission power EIRP according to the average ground height of the satellite Calculate the maximum slant distance R of signal transmission with the lowest elevation angle of the ground receiving antenna; (3) calculate the free space loss Lf of the signal according to the downlink carrier frequency and R of the satellite data transmission signal; (4) calculate the signal free space loss Lf according to the atmospheric loss, receiving antenna pointing loss, receiving Antenna polarization loss and rain attenuation value and Lf calculate the whole transmission loss L of the digital transmission signal; (5) Utilize coding gain, transmission code rate, coding rate and link margin to calculate the bit signal-to-noise ratio of the received signal; (6) According to the bit error rate requirements, calculate the bit signal-to-noise ratio actually required by the received signal, and then obtain the channel margin. If the margin is positive, the overall performance of the data transmission antenna can still meet the system requirements after the damage. Otherwise, the data transmission antenna is damaged. After work performance is affected.

The invention discloses a radar altimeter low intercept performance testing method, aiming to provide a radar altimeter low intercept performance test method with complete test indicators, high test accuracy and low test cost. The present invention is realized through the following technical solutions: the control computer sends the complex scene simulation information to the radar altimeter complex scene simulator, outputs the generated echo signal to the radar altimeter to start the radio frequency control software, and manages the radiation switch of the radar altimeter in real time State, analyze the demand for effective radiation power when the radar altimeter works normally at any height within the altimetry range, determine the minimum radiation power under the premise of meeting the high performance, and send the transmitted signal to The power meter is used to test the transmission signal of the radar altimeter, and the radiation time and radiation power are transmitted to the performance analysis computer. According to the measurement results of the radiation parameters of the power meter, the power control range, step, accuracy and interception factor are calculated.

Disclosed are a method and system for testing mobile terminal WiFi OTA. The method comprises: measuring the effective radiated power of a mobile terminal in each position, and on the basis of same, forming a pattern of effective radiated power; determining, on the basis of the pattern of effective radiated power, a first position corresponding to the time of strongest effective radiated power, and measuring a first effective radiated sensitivity ERSbest of the mobile terminal in said first position; calculating a second effective radiated sensitivity ERS in each remaining second position, on the basis of the following relation: ERS=ERS best +(ERP best −ERP), wherein ERPbest is the effective radiated power of the first position, and ERP is the effective radiated power of each remaining second position; and finding the integral sum of the measured first effective radiated sensitivity ERSbest and the calculated second effective radiated sensitivity in order to obtain the isotropic sensitivity of the mobile terminal. The present invention thereby improves testing efficiency.