卫星链路计算软件Satmaster帮助(2)

Adjacent Channel Interference C/ACI

相邻信道干扰

Enter a value for the carrier to adjacent-carrier interference noise ratio C/ACI in dB. This parameter specifies the expected interference level with respect to the wanted carrier. A typical value to enter for either uplink or downlink is between 24 and 30dB. Some link programs do not use this parameter so if you wish to void it enter 60dB or more. Note that the higher this value is in dB, the lower the interference. 输入一个相邻信道干扰噪声C/ACI，以dB为单位。这个参数指定一个所需载波的干扰程度。上行和下行的典型值在24-30dB之间。很多工程不需要这些参数，如果不希望考虑它，输入60dB以上的值。注意这个值越高表示干扰越小。

Adjacent Satellite Interference C/ASI

相邻卫星干扰

Enter a value for the carrier to adjacent satellite interference noise ratio due to interfering signals to/from adjacent satellites in dB. This parameter specifies the expected interference noise with respect to the wanted carrier..A typical value to enter here for either uplink or downlink is between 18 and 30dB. Note that the higher this value is in dB, the lower the interference.

输入一个相邻卫星干扰噪声C/ASI，以dB为单位。这个参数指定一个所需载波的干扰程度。上行和下行的典型值在18-30dB之间。注意这个值越高表示干扰越小。

Cross Polarization Interference C/XPI

极化干扰

Enter a value for the carrier to cross polarization interference noise ratio C/XPI in dB. This parameter specifies the expected interference level with respect to the wanted carrier. A typical value to enter here for either uplink or downlink is between 24 and 30dB. Note that the higher this value is in dB, the lower the interference.

输入一个交叉极化干扰噪声C/XPI，以dB为单位。这个参数指定一个所需载波的干扰程度。上行和下行的典型值在24-30dB之间。注意这个值越高表示干扰越小。

Earth Station HPA Output Back-Off

地球站高功放输出回退

To reduce uplink interference it is customary to back off the output of the earth station HPA. This trade-off leads to a higher HPA power capability being required. Typical values range from 1 to 7dB.

为了防止上行的噪声一般要对地球站的高功放进行回退。这种权衡的做法会导致需求功放的功率变大。典型值在1-7dB之间。

Number of HPA Carriers

高功率放大器载波数量

Enter the number of carriers simultaneously transmitted by the uplink earth station HPA. Normally this is set to 1 unless you need to size the HPA for multiple carriers. This has no effect other than to increase the HPA power requirement.

输入地球上行功率放大器同时传输的载波数量。如果不需要同时传多个载波的话就输入1。这个数值只会影响功率放大器的功率需求。

HPA Intermodulation Interference C/IM

功放交调干扰

Enter a value for the intermodulation interference expected from the uplink earth station HPA. This parameter is sometimes neglected in many programs. If you wish to make this parameter effectively void enter 60dB or more.. Note that the higher this value is in dB, the lower the interference level.

输入一个上行功放交调干扰值，以dB为单位。很多工程不需要这些参数，如果不希望考虑它，输入60dB以上的值。注意这个值越高表示干扰越小。

Uplink Power Control / Manual Power Boost

上行功率控制/手动功率控制

Uplink Power Control (UPC) also known as Dynamic Carrier Control is used to compensate for instantaneous rain attenuation on the uplink. Enter the dynamic range of the system here. If UPC is not used or site diversity plans are in operation you can enter zero here. UPC systems usually require a high HPA power capability.

上行功率控制（UPC）又叫动态载波控制，是用来抵消上行偶尔的雨衰。输入动态的系统变化值。UPC系统需要更大的功放功率。

雨衰Rain models

Here you can select the rain model to use. Check the checkbox relevant to the model you wish to use.

The ITU/DAH rain model is recommended since it is probably the most accurate model to date. The Crane models are also provided if you prefer them. You do not need to consult rainzone maps with the latter, the zones are determined automatically.

The ITU/DAH model employs a 1.5*1.5 degree lat/long grid of R0.01 rainfall data and uses bilinear interpolation to achieve an improved estimate for a location from it's grid neighbours.

Although not normally necessary, a better accuracy may result with the ITU/DAH model if a localized R0.01 value is obtained. To use this, check the checkbox labelled \your locally obtained R0.01 value into the input field below it. A value of zero may be input if you wish to temporarily remove any rain effects from the budget..

Note: This option is not available for items under the 'Graphs' and 'Tables' menus.

Dual Fade Checkbox (only present on some link budget forms)

Where uplink and downlink stations are separated by several km, it is not normally assumed there is a rainstorm on the uplink and downlink simultaneously as this is statistically unlikely. However, if the uplink and downlink are in the same city or an area which may be covered by a large tropical storm, you may like to check this checkbox so rain attenuation is calculated both on the uplink AND downlink simultaneously. In general, Ku band is not so suitable as C band for tropical regions due to high rain attenuation.

你可以在这里选择雨衰模型。选择相关的复选框即可。

推荐使用ITU/DAH雨衰模型，因为它应该是最精确的模型。Crane模型也可以使用，这种模型你无须寻找降雨地图，系统会自动计算。

ITU/DAH使用1.5*1.5经纬度的方格来统计各地区的R0.01降雨数据，而且使用双线性插值法来得到更精确的估计。

虽然通常不必要，但是如果有相关r0.01数据的话ITU/DAH是更精确的。点选ITU mm/h来手动输入R0.01值。如果不想计算雨衰值可以输入0. 注：这个值是不能在Graph或者Table里面查的。 双重雨衰选项（只有一部分链路预算需要） 如果上下行站相距几千米，一般上行下行同时下雨的情况为统计上的不可能。但是如果上下行在同一个城市或者地区，可能受同一个降雨云影响，你可能需要计 …… 此处隐藏：7492字，全部文档内容请下载后查看。喜欢就下载吧 ……