WebThe combination of the direct and re-reflected ground echo changes the transmitting and receiving patterns of the antenna. This is substantial in the VHF range and decreases with increasing frequency. For the detection … WebThe antenna pattern measurements were taken on the MSC ground-reflection range. The test setup with reflection effects included is shown in figure 3. The three operational frequencies of 259.7, 279. 0, and 296.8 megahertz were used. A range length of 1000 feet was chosen to insure adequate simulation of long-range multipath ...
Chapter 9 ANTENNA RANGE MEASUREMENTS - qsl.net
Webproviding reflection coefficients as low as –50 dB at normal incidence. Reflection increases as the angle of incidence increases. For example, a typical reflection of –25 dB is related to an angle of incidence of about 70 degrees. A typical absorbing element has the form of a … fleckstm yarn by loops \u0026 threads
Antenna gain calibration on a ground reflection range
WebINET has a range of path loss models available, including simple models like free space path loss and more complex ones like Rician and Rayleigh fading. ... It is apparent that the two-ray ground reflection model yields the same values as the free space path loss model, up until the cross-over distance. After that point, the two curves diverge ... WebFeb 1, 2002 · A method to increase the accuracy of antenna gain and radiation pattern measurements on far-field ground ranges is presented. The method consists in ground reflections reduction by means of... WebDetection Range: Crawling man: 500 m Walking man: 2 km (1.2 mi) Group of people: 7 km (4.3 mi) Light vehicle: 10 km (6.2 mi) Heavy vehicle: 14 km (8.7 mi) Range accuracy: 20m rms Range resolution: 50 m Speed: 0.9 … fleck stone paint