CIRCUS Characterization of the Ionosphere using Radio receiver on a CUbeSat

Transcription

1 CIRCUS Characterization of the Ionosphere using Radio receiver on a CUbeSat PROJECT PRESENTATION SCIENTIFIC POINT OF VIEW EDUCATIONAL POINT OF VIEW 1

2 Payload Antenna Sensor Analog input Signal G Pre-Amplifier STAR Digital output Signal DPU STAR requirements High dynamic range ~ 120 db Bandwidth : 100 MHz Frequency resolution : ~5% ( 1% for the tracking of local plasma frequency) Temporal resolution : < 1s 2

3 Payload STAR 1 st ASIC casting without ADC : summer nd ASIC casting (full) : summer 2018 Radiation qualification 3

4 Project presentation and goals i ) Scientific goal Study of the ionosphere s E/F layers between 400 and 600 km ii) Data processing goal Test different detection algorithms iii ) Technical goal Spatialize a new concept of digital radio receiver 4

5 Thermal noise spectroscopy Preamplifier STAR DPU STAR FFT Fp = 9 * ne Temperature with the plate gradient 5

6 Mission Analysis Main objective : to map the ionosphere Mission duration : ~ 6 months Observation modes «SPECTRE» : Spectrum acquisition (1024 pts) 1 measurement / 5 minutes «SURVEY» Follow the plasma peak position : 1 measurement / second «BURST» : Follow the plasma peak ~millisecond 6

7 Orbit : tilt determination Sun-synchronous orbit, tilt 98 (50 days) Sun-synchronous orbit the cubesat in low polar orbit passes over a given latitude at fixed local hour (interest : download the data during working hours) 75 orbit Better covering for the same observation period 75 Orbit (50 days) 7

8 Orbit : altitude determination and telecommunication Circular polar orbit - Altitude 600 km (Assumed ground station in Toulouse) Visibility~ 27 mn 30 s in 4 passes Circular polar orbit - Altitude 400 km (Assumed ground station in Toulouse) Visibility ~ 14 mn 30 s in 3 passes 8

9 Difficulties Available onboard power budget Attitude control determination Antenna conception for the payload Validation for the deployment system of the payload OGMS-SA CURE 9

10 Difficulties Available power for data processing study Telemetry budget (several ground stations vs. one) Data processing Main solution : FPGA developped by students (replica of a valid concept from LESIA) Hybrid solution : FPGA + ARM processor (proposition of uploading new algorithms after the launch) in partnership with ECL students GPU solution proposed by Damien Gratadour : not chosen 10

11 Current goals Mission analysis done by Aleksandar COCIC System analysis of the spacecraft Ø Assumed payload Ø Definition of the spacecraft specifications and requirements Ø Definition of a spacecraft prototype coupled to a payload prototype Ø Thinking on the qualification and integration/testing aspects Thermal model of the spacecraft (in development) 11

12 Students summary Data Processing internships (CIRCUS/STAR) Yosra GARGOURI (6 months UPMC/Télécom ParisTech) Mathilde DUPART (6 months TUM/Télécom ParisTech) Faisability study internshipsand mission analysis Julie ORZEKOWSKA (6 months Master OSAE) Aleksandar COCIC (6 months EFP) Master OSAE projects (2 in in 2015) (thermal analysis, antennas, AOCS) Internship L3/UPMC (Plasma analysis of thermal noise in the ionosphere) 2015 Internship L3/UPMC (Orbitography CIRCUS) 2016 System engineering internship Guillaume HWANG (6 months Master OSAE ~ in progress) Thermal engineering internship Tobias FLECHT (6 months 2016~ in progress) M1 Internship Study of the power available on board Paul ADAMZCYK (3 mois 2016 ~ in progress) 3 semesters project (2016/2017) of 7 ECL students on data processing 12

13 CIRCUS Balance Nanosatellite project (2 available options) : ʺstudent optionʺ or ʺstudent + research optionʺ Mission analysis (Spacecraft attitude, inclination, ground stations) 3 observation modes nanosatellite spin : question to solve 1st ASIC è payload breadboard (ESEP funding) Payload deployable antenna : to study and to validate Technical balance (% margins to justify) IDM-CIC tools (CNES) on-board software to be define Power balance (to be justified) Platform : Definition + on-the-shelf purchase Test facilities (CERES + PIT) Project study progressing slowly : Student's training courses (from March to September) 13

14 Questions? 14