Lunar Astro-Track


Engineering

   Details of the Lunar Astro-Track design are described in this section.  Here you will find link-budgets, data rates, and other technical information.

   Design Topics:


       System Summary


       RFID Link Budget (Nominal)

       RFID Link Budget (Emergency)

       RFID Components

       

       Lunar Lander Link Budget

       Lunar Link Components


       Radio Location Accuracy

            Range Ring Accuracy
            DF System Accuracy
           

       Power Systems

           


                    
            

Engineering System Summary

RFID Astro-Track

RFID Carrier Frequency  : 1.15 GHz
RFID Modulation : Direct Sequence Spread Spectrum (Unmodulated)
RFID Chip Rate : 3 MegaChips/Second

Nominal Detection Range: 20m
Nominal Power Required : 20 W

Emergency Detection Range: 100m
Emergency Power Required : 500 W


Lunar Link


Lunar Link Carrier Frequency : 1.3 GHz
Lunar Link Modulation: Direct Sequence Spread Spectrum(Modulated)
Lunar Link Chip Rate : 500 KiloChips/Second
Processing Gain : 2

Encoder:  Rate 1/2 Convolutional Encoder
Bit Rate :  125 kbits/Second
Power Required (2 KM) : 1 kilowatt