【正文】 H rain model is remended 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 * degree lat/long grid of rainfall data and uses bilinear interpolation to achieve an improved estimate for a location from it39。如果不需要同時(shí)傳多個(gè)載波的話就輸入1。Cross Polarization Interference C/XPI極化干擾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.輸入一個(gè)交叉極化干擾噪聲C/XPI，以dB為單位。這個(gè)參數(shù)指定一個(gè)所需載波的干擾程度。2） 大地噪聲。s specifications. The total noise temperature of the antenna depends mainly on the following factors:1) Sky Noise The total antenna noise, Tant = Tsky+Tgnd. The sky noise, Tsky, consists of two main ponents, absorption and the background 39。.LNB Noise Figure (LNB Noise Temperature)The default interpretation of this input parameter is Noise Figure. However, if you prefix the input value with a 39。如果你不知道則輸入60%作為最悲觀估計(jì)在鏈路預(yù)算和雙饋形式中，這個(gè)值必須加一個(gè)“+”前綴以便程序?qū)⑵浣庾x為增益，以dBi為單位，而不是天線效率。如果你愿意通過“worstmonth最糟糕的一個(gè)月”數(shù)值轉(zhuǎn)換為年平均信號可用度，可以通過Calculatec菜單下的工具進(jìn)行換算。 horizontal) or circular. Enter the letter V for vertical polarization, H for horizontal polarization or C for circular polarization.極化這就是所需衛(wèi)星轉(zhuǎn)發(fā)器的極化方式，可以選線性（垂直和水平）或圓極化。這主要是用來計(jì)算雨衰和大氣吸收值，單位是千米。Site LongitudeEnter the longitude of the site where the earth station is located. This must be entered in decimal degrees with the suffix W for west and E for East. No spaces are allowed. Examples or Important Note:When entering data into country data files longitudes are required in degrees and minutes format as obtained from maps and atlases. In this case the fractional part represents the number of minutes and cannot exceed 59. In all other cases input in decimal degrees are assumed. A conversion facility is provided under the calculate menu.基站經(jīng)度輸入基站的經(jīng)度。上下行部分Site Name / LocationEnter the literal name of the site where the earth station is located up to a maximum of 40 characters (18 for country data files)Example input for country data files (18 characters maximum)LiverpoolExample input for all other forms (40 characters maximum)Liverpool, Merseyside, England.基站名稱輸入基站所處位置的名稱，最多40個(gè)字母。Caculate菜單中有一個(gè)轉(zhuǎn)換工具。Altitude of SiteEnter the altitude of the earth station above sea level. This is primarily used in the calculation of rain attenuation and atmospheric absorption. The units are kilometres. km is the maximum altitude allowed. Enter zero if you will prefer a slightly pessimistic worst case link budget calculation.基站海拔輸入基站的海拔。PolarizationThis is simply the polarization system adopted by the wanted satellite transponder and is either linear (ie vertical amp。這個(gè)數(shù)值經(jīng)常用來計(jì)算合適的雨衰。多數(shù)天線的效率在6070%之間。Antenna noise temperatureA value for the antenna noise temperature is often quoted in manufacturer39。所以海拔降低大氣噪聲就會增加，因?yàn)樵陔姶挪ㄔ诖髿庵袀鞑サ母h(yuǎn)。Adjacent Channel Interference C/ACI相鄰信道干擾Enter a value for the carrier to adjacentcarrier 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. 輸入一個(gè)相鄰信道干擾噪聲C/ACI，以dB為單位。注意這個(gè)值越高表示干擾越小。Number of HPA Carriers高功率放大器載波數(shù)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.輸入地球上行功率放大器同時(shí)傳輸?shù)妮d波數(shù)量。UPC系統(tǒng)需要更大的功放功率。推薦使用ITU/DAH雨衰模型，因?yàn)樗鼞?yīng)該是最精確的模型。因?yàn)橛晁?，Ku波段總體來講不如C波段適合熱帶地區(qū)的通信。它可以在衛(wèi)星運(yùn)營商的G/T等高線圖那里得到。 當(dāng)轉(zhuǎn)發(fā)器工作于功率限定模式的多載波模式，衛(wèi)星運(yùn)營商經(jīng)常將衰減跳到10dB或16dB來增加支持的載波數(shù)，這會增大地球站上行的功率。s use. This program assumes you have entered the SFD corresponding to an attenuator setting of 0dB and adds this value to it.Example: Suppose the SFD, with 0dB attenuator pad setting is given as 90dBW/m2. The overall SFD with the 10dB attenuator pad included is, 90dBW/m2 +10dBW/m2 = 80dBW/m2) Important note: If you have already allowed for a nominal attenuator pad setting in the SFD input field you must set this parameter to 0dB otherwise you could severely over dimension the link.輸入衛(wèi)星衰減器衰減，以dB為單位。ALC最好用于上行C/N0大于下行10dB以上的飽和載波。Transponder Input Backoff (IBO)轉(zhuǎn)發(fā)器輸入回退IBOThis parameter is set to the total transponder input back off, or operating point, relative to single carrier saturation. Most satellite transponders operating in multicarrier mode (. SCPC carriers sharing the same transponder) will operate with an input backoff within the range 6 to 10dB to reduce intermodulation interference and/or to limit the downlink EIRP density within certain agreed limits..這個(gè)參數(shù)是轉(zhuǎn)發(fā)器輸入回退，或者說工作點(diǎn)，相對于單載波飽和發(fā)送。換句話說，這兩個(gè)值是自動計(jì)算中成對生成的。如果你無法得到輸出回退或者交調(diào)干擾的確切值就輸入AUTO讓程序根據(jù)典型的行波管放大器和固態(tài)放大器參數(shù)自行估算兩個(gè)值。你應(yīng)該在以后重新修改精確這一數(shù)字。注意1） 如果手動輸入該值，上行鏈路中的“功放功率容量”會隱藏。典型值在GraphReference Eb/No Curves計(jì)算出。如果不清楚可以輸入0?；蛘吣阋部梢暂斎胍粋€(gè)小數(shù)，比如相應(yīng)（204/188）。1+Rolloff factor1+滾降系數(shù) The roll off factor for a digital filter is typically expressed as a figure less than unity. However the actual factor used to expand the bandwidth is (1 + roll off factor).Ranges between to are frequently used here. If in doubt, enter a nominal value of .Note: The bandwidth used by a digital carrier is proportional to the symbol rate, not the bit rate.數(shù)字濾波器的滾降系數(shù)通常表示為一個(gè)圖形。，輸入值設(shè)為“1+滾降系數(shù)”的值。如果你的鏈路預(yù)算超出預(yù)算，或者收到余量負(fù)溢出警告，請將該值設(shè)為0.Edit Digital Modulation Method編輯數(shù)字調(diào)制模式。比如BER=10^6只要輸入6，BER=10^。Downlink Optimization Radio Buttons下行優(yōu)化單選按鈕只有手動輸入“載波