AAE450 Spring 2009

Communications

Ground Stations

Communication Equipment

Alternative Landing Method

March 26, 2009[Trent Muller] [COM]

AAE450 Spring 2009

Communication Equipment on Lander

Equipment Model Manufacturer Mass (kg) Power Usage (W)

Price (2009 $)

Lander-Earth Antenna (2)

Patch Antenna SSTL 0.16 -- 40,000

Lander-Earth Receiver

RX-200S SpaceQuest 0.2 1.5 30,000

Lander-Earth Transmitter

TX-2400 SpaceQuest 0.2 34 24,000

Lander-Rover Antenna

ANT-100 SpaceQuest 0.1 -- 500

Lander-Rover Transceiver

TR-400 SpaceQuest 0.21 6 20,000

Computer Board RAD6000 BAE 0.85 13 200,000

Video Camera HF10 Canon 0.38 3.9 1,000

Antenna Pivot (2) -- -- 0.38 2.13 168

Totals 2.48 60.53 315,668

[Trent Muller] [COM]

100 gram Payload

AAE450 Spring 2009

10 kg PayloadEquipment Model Manufacturer Mass (kg) Power Usage

(W)Price (2009 $)

Lander-Earth Antenna (2)

Patch Antenna SSTL 0.16 -- 40,000

Lander-Earth Receiver

RX-200S SpaceQuest 0.2 1.5 30,000

Lander-Earth Transmitter

TX-2400 SpaceQuest 0.2 34 24,000

Computer Board RAD6000 BAE 0.85 13 200,000

Video Camera HF10 Canon 0.38 3.9 1,000

Antenna Pivot (2) -- -- 0.38 2.13 168

Totals 2.17 54.53 295,167

[Trent Muller] [COM]

AAE450 Spring 2009

Ground StationsGround Station Latitude (o) Longitude (o) Dish Size

(m)

1 Mt. Pleasant Radio Observatory. Hobart, Tasmania, Australia 42.81 S 147.44 E 26

2 Ventspils International Radio Astronomy Centre (VIRAC). Irbene, Latvia

57.55 N 21.85 E 32

3 Pisgah Astronomical Research Institute (PARI). Rosman, North Carolina

35.20 N 82.87 W 26

[Trent Muller] [COM]

• Worst case altitude for coverage gap : 80,000 km from VIRAC• Plan to use Universal Space Network from LEO to 80,000 km• Universal Space network consists of 14 ground stations all around the world• Estimated cost: $1 million (2009$) for one year of usage, one station at a

time.

AAE450 Spring 2009

Backup SlidesTop down view of Earth showing ground stations an coverage gaps

1. Mt. Pleasant2. VIRAC3. PARI

Altitdues Altitude (km)

h1 7662.33

h2 3977.22

h3 8704.07

[Trent Muller] [COM]

AAE450 Spring 2009 [Trent Muller] [COM]

Side view of Earth showing coverage of Mt. Pleasant Observatory’s worst case scenario.

For southern hemisphere: Moon’s orbital inclination positive with northern hemisphere tilted towards the Moon

Observatory Altitude (km)

Hobart 18031.14 km

Irbene 79232.09 km

Rosman 11569.17 km

AAE450 Spring 2009

High Energy Tangent Landing Represents the Lander landing

with a significant horizontal velocity and sliding on Lunar surface without skipping, digging in, or creating a crater immediately upon impact.

Assumes constant deceleration based on initial impact.

Based on an old design iteration with a dry mass of 163.49 kg

Shows three landing cases

1) 10g

2) 15g

3) 20g

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.50

1

2

3

4

5

6

7

horizontal velocity (km/sec)

dist

ance

(km

)

skid distance vs. horizontal velocity

10g

15g20g

[Trenten Muller] [COM]