Requirements Document

Version 4 (Jeremy Wright, 11/26/2013 12:58 pm)

1 1 Jeremy Wright
h1. Far Horizons Project Requirements Document
2 1 Jeremy Wright
3 1 Jeremy Wright
{{toc}}
4 1 Jeremy Wright
5 1 Jeremy Wright
h3. Introduction
6 1 Jeremy Wright
7 1 Jeremy Wright
The requirements list matches up to the Initial Questions in step one of the Systems Engineering process as shown below. Each requirement is labeled with FHPR (Far Horizons Project Requirement), followed by the number of the [[Initial_Questions_v1_0|initial question]] that the requirement corresponds to, followed by a dot and then the ID number of the requirement.
8 1 Jeremy Wright
9 1 Jeremy Wright
* *FHPR 1.x* - Why are we making this?
10 1 Jeremy Wright
* *FHPR 2.x* - Who is this for?
11 1 Jeremy Wright
* *FHPR 3.x* - How will this be used?
12 1 Jeremy Wright
* *FHPR 4.x* - What features does it need to have (now)?
13 1 Jeremy Wright
* *FHPR 5.x* - What features does it need to have (later)?
14 1 Jeremy Wright
* *FHPR 6.x* - What are the legacy requirements?
15 1 Jeremy Wright
* *FHPR 7.x* - Who's going to build this?
16 1 Jeremy Wright
* *FHPR 8.x* - How many do we want to make?
17 1 Jeremy Wright
* *FHPR 9.x* - What is the budget?
18 1 Jeremy Wright
* *FHPR 10.x* - What is the timeline?
19 1 Jeremy Wright
* *FHPR 11.x* - What waste products will be produced by the manufacture and/or operation of this?
20 1 Jeremy Wright
21 1 Jeremy Wright
22 1 Jeremy Wright
h3. Technical Requirements
23 1 Jeremy Wright
24 1 Jeremy Wright
Technical requirements are those requirements which include measurable performance values.  Each technical requirement should be verified through testing to ensure the design meets the requirement.
25 1 Jeremy Wright
26 1 Jeremy Wright
* *FHPR 3.1* The HAB must be able to carry scientific and engineering payloads to a "near space environment" and return the payloads safely.
27 1 Jeremy Wright
** *FHPR 3.1.1* Individual modules must weigh 6 lbs or less.
28 1 Jeremy Wright
** *FHPR 3.1.2* Total launch weight must be 12 lbs or less.  
29 1 Jeremy Wright
* *FHPR 3.2* The HAB must be able to withstand the near space environment.
30 1 Jeremy Wright
** *FHPR 3.2.1* Must be able to operate at a pressure 0.01 atm.
31 1 Jeremy Wright
** *FHPR 3.2.2* Must be able to operate at radiation levels of up to 60x that at ground level. 
32 1 Jeremy Wright
** *FHPR 3.2.3* Must be able to operate at -60 C. 
33 1 Jeremy Wright
* *FHPR 3.3* The HAB electronics must be able to run for a minimum of 2 hours including 1 hour at altitude (these times are subject to individual mission plans).
34 1 Jeremy Wright
35 1 Jeremy Wright
* *FHPR 4.1* The HAB will carry payloads to altitudes between 90k ft and 100k ft.
36 1 Jeremy Wright
* *FHPR 4.4* The HAB will include a descent system to provide a soft landing (max landing speed of 25 mph).
37 1 Jeremy Wright
38 1 Jeremy Wright
* *FHPR 6.1* The design and operation of the HAB shall comply with "FAR 101":http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&rgn=div5&view=text&node=14:2.0.1.3.15&idno=14#14:2.0.1.3.15.4.
39 1 Jeremy Wright
40 1 Jeremy Wright
h3. Project Requirements
41 1 Jeremy Wright
42 1 Jeremy Wright
Project requirements are the remaining requirements which are not tied to specific performance values.
43 1 Jeremy Wright
44 1 Jeremy Wright
* *FHPR 2.1* The HAB must be well documented so as to meet the needs of open source spaceflight designers who will design and build High Altitude Balloons (at Adler and elsewhere).
45 2 Jeremy Wright
* *FHPR 2.2* The HAB documentation and procedures must be complete enough for Adler operators, students, educators, and Makers who want to bring near space missions into the classroom, and anyone else interested in running near space missions.
46 1 Jeremy Wright
* *FHPR 2.3* The HAB documentation must cover the the development, setup, launch, tracking, and recovery of the HAB.
47 1 Jeremy Wright
48 1 Jeremy Wright
* *FHPR 4.2* The HAB documentation shall include safety guidelines for launch and recovery.  
49 1 Jeremy Wright
* *FHPR 4.3* The HAB will broadcast a tracking signal to facilitate recovery.
50 1 Jeremy Wright
51 1 Jeremy Wright
52 3 Jeremy Wright
* *FHPR 7.1* All HAB design documentation must be open and complete enough so that anyone, without necessarily a technical education in high altitude ballooning or engineering, would be able to build and operate the HAB.
53 1 Jeremy Wright
54 1 Jeremy Wright
* *FHPR 8.1* The design and documentation of the HAB must enable the completion and operation of at least one HAB by a third-party.
55 1 Jeremy Wright
56 1 Jeremy Wright
* *FHPR 9.1* The cost of the first third-party operational HAB must not exceed $300 excluding "consumables" and tools.
57 1 Jeremy Wright
58 4 Jeremy Wright
* *FHPR 10.1* The build schedule for the HAB should be between 4 and 5 weeks from project commitment to launch.
59 1 Jeremy Wright
60 1 Jeremy Wright
* *FHPR 11.1* Electronic waste items, including batteries (lithium and others) and circuit boards, must be disposed of according to all local, state, and federal guidelines.
61 1 Jeremy Wright
* *FHPR 11.2* If the structures of the HAB are damaged beyond repair during operation, proper disposal/recycling guidelines must be followed for the materials used in its construction.
62 1 Jeremy Wright
* *FHPR 11.3* Wherever possible, the HAB design should make it as easy as possible to replace components which are consumable or relatively easy to damage.
63 1 Jeremy Wright
64 1 Jeremy Wright
h3. Future V2.0 Requirements
65 1 Jeremy Wright
66 1 Jeremy Wright
These are for reference only so that future features can be accommodated in the current design where practical.
67 1 Jeremy Wright
68 1 Jeremy Wright
Version 2.0 and beyond:
69 1 Jeremy Wright
* *FHPR 5.1* Implement advanced tracking and recovery systems used by Adler (redundant APRS transmitters/receivers and cut down unit)
70 1 Jeremy Wright
* *FHPR 5.2* Controlled descent system (guided landings using parafoil/air-ram kite to either hit or avoid landing sites)
71 1 Jeremy Wright
* *FHPR 5.3* Live two-way telemetry (or command & control) and the ability to receive live experiment and operations data
72 1 Jeremy Wright
* *FHPR 5.4* Stabilized platform system (Adler is making progress on this one)
73 1 Jeremy Wright
* *FHPR 5.5* Alternative balloon configurations (zero-pressure, super-pressure balloons)
74 1 Jeremy Wright
* *FHPR 5.6* Alternate lift gasses (Adler uses helium right now)
75 1 Jeremy Wright
* *FHPR 5.7* A structure to hold the balloon during filling operations and to automatically stop the filling operation for the desired lift
76 1 Jeremy Wright
77 1 Jeremy Wright
h3. Glossary
78 1 Jeremy Wright
79 1 Jeremy Wright
* Cut Down Unit - Device for detaching the balloon envelop from the flight vehicle to prevent unwanted interactions with the descent control system (often a parachute)
80 1 Jeremy Wright
* FHPR - Far Horizons Project Requirement
81 1 Jeremy Wright
* HAB - High Altitude Balloon