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1 PicoSat TT&C Hardware design 2005.04.21 EE/ 劉錦文

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Presentation on theme: "1 PicoSat TT&C Hardware design 2005.04.21 EE/ 劉錦文"— Presentation transcript:

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2 1 PicoSat TT&C Hardware design EE/ 劉錦文

3 2 Electrical Engineering Division TT&C 架構圖 Transponder CW circuit UHF/VHF Antenna CW 29MHz Antenna Morse Code I/P Modem

4 3 Electrical Engineering Division Block diagram-Modem FSK Modulator FSK DeModulator OSC. Control OBMU control Mod/DeMod Matching circuit RF module

5 4 Electrical Engineering Division Block diagram-Transponder Matching circuit PTT MODEM RF module VX-1R Divider Combiner Reset controlRreq. controlBand select DC monitor Antenna

6 5 Electrical Engineering Division Block diagram-CW DC Switch Osc. Driver OBMU Control Matching Circuit Amplifier Antenna

7 6 Electrical Engineering Division Interface TT&C Transponder Data in Data out GND Reset controlRreq. controlBand select DC monitor CW control DC +5VDC +3.6V GND VHF Antenna CW Antenna

8 7 Electrical Engineering Division TT&C schematic-all 已有修正

9 8 Electrical Engineering Division TT&C schematic-Pin assignment

10 9 Electrical Engineering Division TT&C schematic-FSK modulator

11 10 Electrical Engineering Division TT&C schematic-FSK demodulator

12 11 Electrical Engineering Division TT&C schematic-FM radio

13 12 Electrical Engineering Division TT&C schematic-Divider/ Combiner

14 13 Electrical Engineering Division Divider/Combiner simulation(1) Simulator  Microwave office 4.0 Theoretical  Wilkson power divider, ref.Microwave engineering/Pozar

15 14 Electrical Engineering Division Divider/Combiner simulation(2)

16 15 Electrical Engineering Division RF module for transponder

17 16 Electrical Engineering Division Structure by Photo-PCB

18 17 Electrical Engineering Division RF module&Modem mounting

19 18 Electrical Engineering Division RF module control signal wiring

20 19 Electrical Engineering Division Component modify

21 20 Electrical Engineering Division VHF antenna test set

22 21 Electrical Engineering Division CW antenna test set

23 22 Electrical Engineering Division Structure by Photo-YamSat

24 23 Electrical Engineering Division Test-Test record

25 24 Electrical Engineering Division Test-Spurious fail record

26 25 Electrical Engineering Division Test-VHF modulation record

27 26 Electrical Engineering Division End to end test (1) Frequency : MHz Bit rate : 1.2kHz Test Item : Free space MHz interference at HsinChu. Location : 南寮 Distance : 1km Date : 10/4’2001

28 27 Electrical Engineering Division End to end test (1)-Test result VHF  Command BER >  Telemetry BER >10 -6 CW  Morse code decode during test period: 95% Conclusion  Very good a test result.

29 28 Electrical Engineering Division End to end test(2) Location  Ground Station at NSPO’10F  Latitude: 24 o 47’02.4”  Longitude: 121 o 00’07.04”  The height above mean sea level : 150m  Beacon site at NSPO’10F  Distant of ground station 25m.  湖口休息站  Latitude: 24 o 51’35.8”  Longitude: 121 o 00’43.0”  The height above mean sea level : 195m  Distant to Ground Station 8.68km

30 29 Electrical Engineering Division Test result summary VHF  Frequency MHz  Real test path loss: 133~142dB  The 600km orbital height max. space loss = 145dB  The theoretical value of path loss: 99dB  Performance of data package  50% successfully received  Amateur radio to estimate are “Acceptable”.

31 國家太空計劃室 Section : TT&C By :Yuga_Hsu Date : 2005/04/21 CW Hardware Design Continue Wave (CW) Transmitter Design & Measurement

32 Overall 國家太空計劃室 What's Continue Wave CW Specifications Transmitter Configuration Oscillator Circuit Amplifier Circuit Low Pass Filter Design Power Splitter Design Output power Measurement

33 What's Continue Wave 國家太空計劃室 波的頻率和振幅是固定不變的 特殊的節奏斷續發射電波 也是屬於一種調制的方式 電路相當簡單,容易製作 干擾很多的狀況下比語音容易分辨 有較長通訊的距離

34 CW Telemetry Data 國家太空計劃室

35 Specifications Frequency 29.49MHz Output power 200mW/each port Filter loss < 2dB Splitter loss < 3.5dB Max. Spurious output < -50dBc Frequency stability ±25Hz/day

36 Transmitter Configuration 國家太空計劃室 Ant2 SplitterFilter Ant1 Crystal Oscillator 2th Amplifier 1th Amplifier

37 Oscillator Circuit 國家太空計劃室

38 Amplifier Circuit 國家太空計劃室

39 The Amplifier Output Voltage 國家太空計劃室 4.96V F=29.48MHz

40 The Amplifier Circuit 國家太空計劃室 2S1971/0

41 Low Pass Filter Design 國家太空計劃室 Microwave Office Simulation

42 Low Pass Filter Simulation 國家太空計劃室 Simulation Result

43 The Filter Circuit 國家太空計劃室

44 Amplifier Output Without Filter 國家太空計劃室 29.49MHz 24.06dBm

45 國家太空計劃室 Amplifier Output With Filter 29.49MHz 22.06dBm

46 Power Splitter Design 國家太空計劃室 Microwave Office Simulation

47 Power Splitter Simulation 國家太空計劃室 Simulation Result

48 The Splitter Circuit 國家太空計劃室 RF in Ant 2 Ant 1

49 CW Transmitter Schematic 國家太空計劃室

50 The Circuit Outline

51 The CW Layout Design 國家太空計劃室 Protel_PCB Layout

52 CW Layout Circuit 國家太空計劃室 Enable GND +5V GND Ant1 Ant2 Splitter Filter OSC

53 CW Output Power 國家太空計劃室 29.49MHz 24.06dBm

54 CW Low-Pass Filter 國家太空計劃室 Without Filter with Filter

55 CW Spurious Measurement 國家太空計劃室 52dBc 58.9MHz 63dBc 88.4MHz Max. Spurious 29.4MHz

56 The Transmitter Noise Per Hz 國家太空計劃室 Noise


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