SM Weapon's Test Flashcards
What does the PDU do?
- Consists of a circuit breaker box and a junction box
- Circuit breaker box provides current overload and short circuit protection within the B
- Junction box conditions power going to the CLT.
What is GDOP and what effects does it have?
- The Geometric Dilution of precision. Indicates how much the geometric relationship of the tracked satellites affects uncertainty of the GPS receivers position.
- Low values correspond to good geometry and are preferred.
- It will not inhibit a launch
Where does the GPS feed come from?
- TA-24
- CMIGITs/SDN-500
What do you do if SAASM keys are not tracking?
- Clear the keys and reload.
- Recycle power to track the P(Y) code.
- Clear them and recycle power.
When can you not enter INDOC mode?
- With actual munitions (CLT connected)
- Test fixtures (CATM, TIVA) should not be used in INDOC
Why do you enter INDOC mode?
- Permits missions with simulated munitions inventory.
What is the BLK I footprint based off of?
- Yellow line represents 80% of the max kinematic range (range based)
What is the BLK II footprint based off of?
- B references DLL using 6DOF values for CEP90 (performance based)
When does the TSE disregard target reports from the seeker?
- Less than 6 valid target reports or HIA and slant range to the target is greater than 2000 meters.
What are the conditions for the ESAF?
1) Canister ejection (starts 13.4 sec (+/-11%) digital timer
2) Umbilical disconnect
3) Wing deployment
4) Rocket Motor burn
Timers provide ~15 sec delay from ejection to warhead arming.
How does HIA work?
- Missile can hold up to 12 degree AOA until reaching a calculated LOS angle to the grid location.
- Missile flies directly to the grid when the MC/PCU computes approximately 70 degree impact angle is achieved
- TSE does not accept seeker inputs until within 2000 m slant range passed
- End game velocity = 600 ft/s
- The missile favors velocity and will trade impact angle for velocity.
What BLK can be ground designated and why?
- BLK III, it implements last pulse logic (LPL)
Why do you want a low PRF?
- Lower codes are better for moving targets due to high PRF (sends more updates/higher refresh rate)
- What is the TSE and what does it do?
- Target State Estimator.
- The missile always flies to the TSE-computed target location
- After comparing target location and missile location, the TSE computes fin steering commands
- The Griffin is not solely laser guided, but is TSE guided and laser assisted
- Seeker azimuth and elevation translated into north, east and down directions and target velocity.
What are the improvements between blocks?
- 1 - 2: Reliability
- 2 - 3: Lethality
What are the parts of the Guidance Electronic Unit Assembly?
- MC/PCU
- I/O CCA
- MEMS IMU
- GPS receiver
- GPS antenna
What are the AGM-176 Sections?
- Nose assembly
- Warhead
- Guidance Section
- Wing Section
- Adapter Section
- Rocket Motor
- Control Actuator Section
What are the hazard class for the BLK II/III?
- Total explosive hazard class: 1.2.1E
- Warhead hazard class: 1.1D
What are the low bias assumptions?
- TSE assumes a flat Earth throughout the time of flight
- To mitigate errors, a 50-meter low (HAE) bias is entered into the nav solution. Once the missile reaches within 25 m slant of the low bias, the missile zeroizes its fins and falls ballistic.
What pieces of hardware does the B computer talk to?
- TA-24
- CMIGITs/SDN-500
- B Control Box
What are the 3 phases of the Paveway II trajectory?
- Ballistic
- Transition
- Terminal
What are the release envelope functions for the Paveway II?
- Delivery airspeed
- Dive angle
- Altitude
What is g-bias for the AGM-65L?
- After launch a bias voltage is added to the vertical channel of the autopilot.
- Missile lofts into a “humped” profile
- Offsets gravity
- Extends the aerodynamic range
- Increases impact angle and velocity
- Helps maintain LOS to the target
