| 摘要 |
A method of carrying out a radio propagation survey in which a site (10) FIG 1 which may be an industrial site, such as a power station, or an urban area, is divided into a plurality of elemental areas (12) of a size greater than twenty times the wavelength of the carrier frequency of a test signal transmitted by a base station (14). An operator equipped with a receiver (18) having a communications probability indicator (22) (Figures 2 and 3 (not shown)) proceeds from one elemental area to the next, either on foot or in a vehicle, monitoring a particular characteristic of the transmitted signal and the number of occurrences of that characteristic within a predetermined sampling period in each elemental area, thereby determining the quality of reception of that characteristic. This characteristic may be either the carrier strength or SINAD (the ratio of the [signal plus noise plus distortion] to [noise plus distortion]). In order to conduct a survey for two-way radio communication the power output of the base station is adjusted to equal that of the weakest transmitter to be used in the radio system. <IMAGE> |
