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craigp
Joined: 26 Aug 2008
Posts: 2
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 26 Aug 2008 7:55 telemetry ground station design |
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| I m a beginner in designing a telemetry groundstation. In my project, i need to design a system which can telemetry a stream of data from an onboard transceiver to the groundstation which is situated roughly 200m apart. D transceivers pair i use are CC1100-RTY1 from texas instrument. My question are: which type of antenna i should used at d groundstation? (whether HGA or others like 1/4 wave flexible antenna...etc). Besides, can i directly connect the transceiver on the ground to PC or i need a microcontroller to interface d transceiver to the PC?
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Eugen_E
Joined: 29 Nov 2004
Posts: 326
Helped: 30
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| 27 Aug 2008 1:34 Re: telemetry ground station design |
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You need a microcotroller, because CC1100 has SPI interface. You may use a SoC that includes a C51 MCU.
The transmitter is placed on a flying object?
The maximum output power from CC1100 is 10dBm. I don't think this is enough to ensure reliable operation, event for a flying object, taking into account the antenna on the object may be random oriented during flight. For a ground object the power is very low.
CC1100 is intended for a few meters, like a wireless mouse. Depends a lot on data rate, too. Check datasheet.
The ground station antenna should be λ/4 omnidirectional, if you don't know exactly the position of the object in flight.
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Azulykit
Joined: 18 Feb 2007
Posts: 795
Helped: 100
Location: All over the Map.
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| 27 Aug 2008 4:49 Re: telemetry ground station design |
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Look into what is known as a "link budget". Sklar's book on Digital Communications has a good example.
This will give you a starting point on seeing what you need and where you can make compromises and still have your link work.
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craigp
Joined: 26 Aug 2008
Posts: 2
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| 27 Aug 2008 7:48 Re: telemetry ground station design |
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1 transceiver is placing inside d flying object and another one is at d groundstation receiving data. which means that i need 2 microcontrollers, 2 transceiver, 2 antennas, and a usb to serial port connection wire which create interface between d MCU n d PC?
i plan to set d data rate to 38.4kbps and i wonder if the cc1100 transceiver can support +-200m data transmission???or i need to insert extra PA in the circuit??
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