Requirements Document
Version 6 (Jeremy Wright, 02/11/2014 09:41 am)
| 1 | 6 | Jeremy Wright | h1. Ground Sphere Requirements v0.2 |
|---|---|---|---|
| 2 | 1 | J. Simmons | |
| 3 | 1 | J. Simmons | {{toc}} |
| 4 | 1 | J. Simmons | |
| 5 | 1 | J. Simmons | h2. Technical Requirements |
| 6 | 1 | J. Simmons | |
| 7 | 1 | J. Simmons | h3. TR 1.1 Enable users to receive "space tweets" |
| 8 | 1 | J. Simmons | |
| 9 | 1 | J. Simmons | h4. TR 1.1.1 Predict SkyCube flyover opportunities |
| 10 | 1 | J. Simmons | |
| 11 | 1 | J. Simmons | The *Ground Sphere* will include software which predicts when the SkyCube satellite will flyover the ground station and be within signal reception range |
| 12 | 1 | J. Simmons | |
| 13 | 1 | J. Simmons | h4. TR 1.1.2 Receive radio signals on 915 MHz |
| 14 | 1 | J. Simmons | |
| 15 | 1 | J. Simmons | The *Ground Sphere* will receive radio signals on 915 MHz with sufficient gain to enable decoder software to decode the "space tweet" text message |
| 16 | 1 | J. Simmons | |
| 17 | 1 | J. Simmons | h4. TR 1.1.3 Decode "space tweet" message from SkyCube |
| 18 | 1 | J. Simmons | |
| 19 | 1 | J. Simmons | Decode BPSK-modulated, unencrypted AX.25 data packets sent at 9600 baud |
| 20 | 1 | J. Simmons | |
| 21 | 1 | J. Simmons | h4. TR 1.1.4 Account for Doppler shift |
| 22 | 1 | J. Simmons | |
| 23 | 1 | J. Simmons | The *Ground Sphere* needs to account for Doppler shift during satellite flyovers |
| 24 | 1 | J. Simmons | |
| 25 | 1 | J. Simmons | h3. TR 1.2 Be easy to assemble from kit components |
| 26 | 1 | J. Simmons | |
| 27 | 1 | J. Simmons | h4. TR 1.2.1 Time to assemble |
| 28 | 1 | J. Simmons | |
| 29 | 1 | J. Simmons | The *Ground Sphere* will take no longer than 60 minutes (threshold)/30 minutes (objective) to assemble by an average maker |
| 30 | 1 | J. Simmons | |
| 31 | 1 | J. Simmons | h4. TR 1.2.2 Tools for assembly |
| 32 | 1 | J. Simmons | |
| 33 | 1 | J. Simmons | The *Ground Sphere* will only require simple tools (screw drivers, pliers, wrenches, etc) for assembly |
| 34 | 1 | J. Simmons | |
| 35 | 1 | J. Simmons | h3. TR 1.3 Have low shipping costs for the packaged kit |
| 36 | 1 | J. Simmons | |
| 37 | 1 | J. Simmons | The *Ground Sphere* kit will cost no more than $15 (threshold)/$7.50 (objective) to ship by ground across the USA. |
| 38 | 1 | J. Simmons | |
| 39 | 1 | J. Simmons | h3. TR 1.4 Operate using a modern Windows PC |
| 40 | 1 | J. Simmons | |
| 41 | 1 | J. Simmons | h4. TR 1.4.1 Software must run on Windows |
| 42 | 1 | J. Simmons | |
| 43 | 1 | J. Simmons | The *Ground Sphere* software must run on Windows 7 or Windows 8 (32bit or 64bit) |
| 44 | 1 | J. Simmons | |
| 45 | 1 | J. Simmons | h4. TR 1.4.2 Software must be easy to install |
| 46 | 1 | J. Simmons | |
| 47 | 1 | J. Simmons | The *Ground Sphere* software must ship in a Windows installer |
| 48 | 1 | J. Simmons | |
| 49 | 1 | J. Simmons | h4. TR 1.4.3 Hardware must connect to PC using standard port(s) |
| 50 | 1 | J. Simmons | |
| 51 | 1 | J. Simmons | The ground station radio must connect to the ground station computer through a commonly available port (for example: USB) |
| 52 | 1 | J. Simmons | |
| 53 | 1 | J. Simmons | h3. TR 1.5 Hardware must be robust |
| 54 | 1 | J. Simmons | |
| 55 | 1 | J. Simmons | The *Ground Sphere* hardware should minimize the opportunity for mechanical failures (from things such as broken connectors or a lack of strain relief) |
| 56 | 1 | J. Simmons | |
| 57 | 1 | J. Simmons | h2. Project Requirements |
| 58 | 1 | J. Simmons | |
| 59 | 3 | J. Simmons | h3. PR 1.1 Number to produce |
| 60 | 1 | J. Simmons | |
| 61 | 4 | J. Simmons | The *Ground Sphere* design must enable the production of at least 30 +/- 5 v1.0 kits by volunteers in one or more makerspaces |
| 62 | 1 | J. Simmons | |
| 63 | 3 | J. Simmons | h3. PR 2.1 Budget |
| 64 | 1 | J. Simmons | |
| 65 | 3 | J. Simmons | h4. PR 2.1.1 Unit cost |
| 66 | 1 | J. Simmons | |
| 67 | 3 | J. Simmons | The materials cost must be under $100 per kit. |
| 68 | 1 | J. Simmons | |
| 69 | 3 | J. Simmons | h4. PR 2.1.2 Development cost |
| 70 | 1 | J. Simmons | |
| 71 | 3 | J. Simmons | The project budget (covering three prototypes) must be no more than $500 (threshold)/$400 (objective) |
| 72 | 1 | J. Simmons | |
| 73 | 3 | J. Simmons | h3. PR 3.1 Timeline |
| 74 | 3 | J. Simmons | |
| 75 | 5 | Jeremy Wright | Version 1.0 of the *Ground Sphere* will be ready for kit production no later than Feb 14, 2014. |