AAE 450 Spring 2008

Nicole Bryan1/31/2008Avionics

Sensor Selection and Link Budget Analysis

AAE 450 Spring 2008

Sensors

Avionics

Sensor Unit Price Voltage

Thermal Sensors ~ $10 ~ 5 V

Pressure Sensors ~ $100 Varies(.5V-100mV)

Flow Sensors ~ $215 ~ 110 V (AC)

Force Sensors $55, $112 100LbF, 1000LbF

IMUs ~ $400 ~ 5 V

www.Digikey.com

• This is the start of developing a complete power budget for use in battery selection.

AAE 450 Spring 2008

Link Budget Analysis

Frequency (MHz)

Path Length

(km)

Power Input

(W)

Vehicle Antenna

Beamwidth (deg)

Vehicle Antenna

Diameter (m)

Ground Antenna

Diameter (m)

15 4500 5 30 46.67 15.5

137 4500 5 30 5.11 15.5

400 4500 5 30 1.75 15.5

1428 4500 5 30 0.49 18

2025 4000 5 35 0.30 15

2300 4000 10 35 0.26 10

Reference: Justin Rhodes, Nicole BryanCalculations method: Professor Filmer

Assumptions:• 8.5 x 107 bps

data rate• 2 dB

implementation loss factor

1400 MHz to 1530 MHz• Better signal range• Feasible vehicle

antenna sizes• Low power

requirements

Avionics

AAE 450 Spring 2008

Possible Radio FrequenciesFrequency Range

(MHz) Regulated Use Notes15.005 - 15.010 space research18.068 - 18.168 amateur satellite30.005 - 30.010 satellite ID and space research137 - 137.025 space operation

272 - 273 space operationDifferent International/US regulations

400.15 - 401 space operation1427 - 1429 space operation, telemetry1525-1530 space operation, mobile satellites

1755 - 1850 space operation US regulations only2025 - 2110 space operation2200 - 2290 space operation2290 - 2300 space operation

Reference: FCC - http://www.fcc.gov/oet/spectrum/

Avionics

AAE 450 Spring 2008

IMU

Avionics

IMU Weight G Force Size Bandwidth

Q-Flex® 71 g 250 g 25.4 mm dia. X 24.6 mm high

>300Hz

Cross bows

<.59 kg 1000g Non-operating

76.2 X 95.3 x 81.3 mm

>25 Hz Ang.>75 Hz Accel.

Si-Sensing Systems

<18 g <1000g 18 X 29 X 29mm

10 Hz

Estimate Cost: $500-2000 Weight: 12 – 600g

AAE 450 Spring 2008

Batteries

Estimate Cost: < $10,000 Weight: 2.3-4.5 kg

Avionics

Battery Weight Wh/kg Cost

Silver-Zinc (AgZn) 2.3-4.5 kg 110 ~$10,000

Lithium-Monofluoride (Li/CF)

2.3-4.5 kg 130 --------

Lithium/Thionyl Chloride (Li/SoCl2)

2.3-4.5 kg 185 --------