amal chandran, pi, lasp/university of...

Amal Chandran,

PI, LASP/University of Colorado

2017 INSPIRE WORKSHOP

Ionospheric studies with cubesats:

INSPIRESat-1 carrying the Compact Ionosphere Probe:

The Colorado Space Weather Experiment

• Funded by the NSF

• Launched in 2012

• operated for 28mo

• Collected over 100MB of

Science Data

• Generated over 19 peer

reviewed publications

Relativistic Electron Proton Telescope

LASP Cubesats

• First NASA SMD CubeSat

• Launched Dec 6, 2015

• Deployed May 2016

• Achieved full success

• S/N 001 BCT XACT

• Coordinated in AES projects

course

• Reentry May 2017

• MinXSS-2 scheduled to

launch 2Q17

A new model for satellite development

2017 Smallsat conference Logan, utah, august 6

INSPIRESat-1 Breakdown of Responsibilities

CIP

Launch

Structure

Thermal

ADCS

CDH & FSW

Comm

EPS

S/C I&T

CPT

Tvac

Vib

S/C-LV I&T

LASP/CU

IIST

NCU

SQU

LATMOS

Kyutech

NTU

Spacecraft Operations


INSPIRESat-1 Organizational Structure

Amal Chandran

LASP PI

Loren Chang

NCU PI

Priyadarshan

IIST PI

Kaustubh

Student PM/SEYa Chih Mao

Student PM/SE

Will Evonosky

Student PM/SE

ADCS

Spencer Boyajian

Structures & Thermal

Rong Tsai Lin

EPS

Yi Duann

Comm

Ankit Verma

CDH

Niwhashini

FSW

Chi Kuang Chao

CIP - PI

Tzu-Wei Fang, Science Lead

Tomoko Matsuo

Will EvonoskyShih-Chi Chiu

Charles Lin

Tiger Liu

Tarun Pant

Science Team


INSPIRE Year 1

(Fall 2016- Fall 2017)

INSPIRE Year 2

(Fall 2017- Fall 2018)

INSPIRE Year 3

(Fall 2018- Fall 2019)

2016 2017 2018 2019

MOOC Development

PHD/Masters Student training under INSPIRE Project

Integrate with CU Courses

2nd INSPIRE

Workshop at

CU Boulder

August 1-3,

2017

4th INSPIRE

Workshop at

[TBD]

July/August

2019

3rd INSPIRE

Workshop at

[TBD]

July/August

2018

1st INSPIRE

Workshop at

NCU Taiwan

July 20-22,

2016

Operations

and Science

Analysis &

publications

INSPIRESat- 1

PDR CDR Delivery Launch

Summer

6 credit

Program

Summer

6 credit

Program

Summer

Program

INSPIRESat-1

Schedule

Science Objective 1: Plasma bubbles

Retterer,

2010

● Plasma bubbles form around the magnetic

equator in the early evening where there is a

density gradient and the magnetic field lines don’t

extend to upper parts of the ionosphere (Kil,

2015).

● Bubbles propagate along magnetic field lines

allowing the bubble to expand to latitudes far

from their initiation site (Sultan, 1996).

● Bubbles can be hundreds of kilometers across (in

longitude) and extend hundreds of kilometers up

in altitude above the F-layer (>150 km)(Kil, 2015)

● Bubbles can cause communications disruptions

via scintillation (large drops in signal intensity and

a shift in phase)


Science Objectives 2 and 3: the MTM

Temperature

Fang et al, 2016

● Around midnight at F region heights,there is a

neutral temperature increase and a characteristic

wind pattern which varies in season and solar

activity (see figure to the left of neutral temp as

proxy for the ion temp) (Fang et al, 2016)

● Only a few models accurately capture the MTM

including the coupled Whole Atmosphere Model

(WAM) with the Global Ionosphere Plasmasphere

(GIP) model.

● The MTM shows some seasonal variability in

which it tends to maximize in the summer and

weaken in the winter (Niranjan et al, 2006)

● The MTM is an understudied essential physics

process that represents ion-neutral coupling

Akmaev et al, 2009


● Passes over each grid cell

at 0 Local Time over the

entire 7 month mission.

● Assumes data will only be

collected in the nighttime

INSPIRESat-1 Science Data

INSPIRESat-1 is targeting a 400-600 km and 50° inclination non sun-synchronous

orbit


CIP Design: Overview

● An In-situ Instrument for

ionospheric plasma

properties

measurements.

● Verified functions with

the heritage of sounding

rocket in Taiwan.

● Previous version of CIP

named AIP onboard

Formosat-5 will be

launched on August 24,

2017.


CIP Design: Overview

● High precision of electrical mesh

grids.

● low quasi-hysteresis effect between I-

V curves measurement.

Retarding Potential Analyzer

Mode


CIP Design

Bottom ViewFront View

Top View


Ram Speed

Ion

Composition

Geophysical Data Derived from CIP

PLP RPA IT IDM Orbital and Attitude Data IGRF

Floating

Potential

Electron

Temperature

Ion

Temperature

Ion

Concentratio

n

Arrival

Angles

Ion Velocity in Euler

Angles Coordinate

Ion Velocity in

Geomagnetic Field

Coordinate


INSPIRESat-1 Concept of Operations


Gnd St Average Access Time

>= 5mins (mins)

UHF Data

(Megabytes/day)

S-Band Data

(Megabytes/day)

Boulder 39.433 - 591.495

IIST 14.567 2.048 -

NCU 11.35 1.596 -

Total (for 6 GS) 100.83 8.634 591.495

CIP data

Volume12.5 MB/day

(50% duty cycle, normal

mode)

100 MB/day (fast mode,

50% DC)

UHF Data rate 19.2 kilobits/sec

S-Band rate 0.25 Megabytes/sec

Data Downlink in the Day


1

3

4

Legend:

1 S-band 4.2 m S-band antenna with 24’dia. Radome

2 Radome and Type 2 pedestal base mount structure

3 CubeSat Student Operations Center

4 UHF Antenna

5 UHF RF equipment rack inside building

2

5

LASP CubeSat Student Operations Center

INSPIRESat-1 Assembly

Solar Panel

UHF Antenna Depl Mod

BCT XACT

Battery

Pack

EPS CardC&DH Card

UHF Comm

Module

S-Band

Transmitter

UHF

Antenna

CIP


Some Assembly Required


Subsystems

Subsystem Strategy Delegated to

Payload (CIP) Develop NCU

C&DH Develop IIST

FSW Develop IIST, LASP

EPS Develop NCU

Structure Develop LASP

Communication COTS SpaceQuest TRX-U

and TX-2400 S

ADCS COTS BlueCanyon XACT


20

Prototyping

20

C&DH Board prototype vacuum testing


Battery Board Assembly

INSPIRE Summer 2017


Thank You !Questions

amal chandran, pi, lasp/university of...

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