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12.3.2 Feeder losses
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Losses will occur in the connection between the receive antenna and the receiver proper. Such losses will occur in the connecting waveguides, filters, and couplers. These will be denoted by RFL, or [RFL] dB, for receiver
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The Space Link
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feeder losses. The [RFL] values are added to [FSL] in Eq. (12.11). Similar losses will occur in the filters, couplers, and waveguides connecting the transmit antenna to the high-power amplifier (HPA) output. However, provided that the EIRP is stated, Eq. (12.11) can be used without knowing the transmitter feeder losses. These are needed only when it is desired to relate EIRP to the HPA output, as described in Secs. 12.7.4 and 12.8.2.
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12.3.3 Antenna misalignment losses
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When a satellite link is established, the ideal situation is to have the earth station and satellite antennas aligned for maximum gain, as shown in Fig. 12.1a. There are two possible sources of off-axis loss, one at the satellite and one at the earth station, as shown in Fig. 12.1b. The off-axis loss at the satellite is taken into account by designing the link for operation on the actual satellite antenna contour; this is described in more detail in later sections. The off-axis loss at the earth station is referred to as the antenna pointing loss. Antenna pointing losses are usually only a few tenths of a decibel; typical values are given in Table 12.1. In addition to pointing losses, losses may result at the antenna from misalignment of the polarization direction (these are in addition to the polarization losses described in Chap. 5). The polarization misalignment losses are usually small, and it will be assumed that the antenna misalignment losses, denoted by [AML], include both pointing and polarization losses resulting from antenna misalignment. It should be noted
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(a) Satellite and earth-station antennas aligned for maximum gain; (b) earth station situated on a given satellite footprint, and earth-station antenna misaligned.
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TABLE 12.1 Atmospheric Absorption Loss and Satellite Pointing Loss for Cities and
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Communities in the Province of Ontario Atmospheric absorption dB, summer 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Satellite antenna pointing loss, dB
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Location Cat Lake Fort Severn Geraldton Kingston London North Bay Ogoki Ottawa Sault Ste. Marie Sioux Lookout Sudbury Thunder Bay Timmins Toronto Windsor
SOURCE:
/4 Canada coverage 0.5 0.9 0.2 0.5 0.3 0.3 0.4 0.6 0.1 0.4 0.3 0.3 0.5 0.3 0.5
/2 Canada coverage 0.5 0.9 0.1 0.4 0.6 0.2 0.3 0.2 0.3 0.3 0.2 0.2 0.2 0.4 0.8
Telesat Canada Design Workbook.
that the antenna misalignment losses have to be estimated from statistical data, based on the errors actually observed for a large number of earth stations, and of course, the separate antenna misalignment losses for the uplink and the downlink must be taken into account.
12.3.4 Fixed atmospheric and ionospheric losses
Atmospheric gases result in losses by absorption, as described in Sec. 4.2 and by Eq. (4.1). These losses usually amount to a fraction of a decibel, and in subsequent calculations, the decibel value will be denoted by [AA]. Values obtained for some locations in the Province of Ontario, Canada, are shown in Table 12.1. Also, as discussed in Sec. 5.5, the ionosphere introduces a depolarization loss given by Eq. (5.19), and in subsequent calculations, the decibel value for this will be denoted by [PL]. 12.4 The Link-Power Budget Equation As mentioned at the beginning of Sec. 12.3, the [EIRP] can be considered as the input power to a transmission link. Now that the losses for the link have been identified, the power at the receiver, which is the power output of the link, may be calculated simply as [EIRP] [LOSSES] [GR], where the last quantity is the receiver antenna gain. Note carefully that decibel addition must be used.
The Space Link
The major source of loss in any ground-satellite link is the free-space spreading loss [FSL], as shown in Sec. 12.3.1, where Eq. (12.13) is the basic link-power budget equation taking into account this loss only. However, the other losses also must be taken into account, and these are simply added to [FSL]. The losses for clear-sky conditions are [LOSSES] [FSL] [RFL] [AML] [AA] [PL] (12.12)
The decibel equation for the received power is then [PR] where [PR] [EIRP] [FSL] [RFL] [AML] [AA] [PL] [EIRP] [GR] [LOSSES] (12.13)
received power, dBW equivalent isotropic radiated power, dBW free-space spreading loss, dB receiver feeder loss, dB antenna misalignment loss, dB atmospheric absorption loss, dB polarization mismatch loss, dB
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