Q&A_Word.pdf

N00173-18-R-DH03

Question & Answers

11/17/2017

RFP Reference Question Answer

1 SOW, Figure 12, Page 17 Figure 12 on page 17 of the SOW identifies the

IMU as Vendor supplied item and also depicts it as off the gimbal.

a. Is it possible that the platform already has an

IMU that can be utilized? This is a potential significant cost element and of great importance.

b. Please advice if this can be the case and provide associated details and inclusion on the

GFP list. Also Clarify Figure 1 depicting the

IMU as part of the moving payload which contradicts Figure 12.

a. NRL can make a Northrop Grumman LN251B IMU/GPS device available for this activity.

b. The vendor is responsible for devising an architecture capable of compensating for the aircraft dynamics, whether this includes an IMU on board the parabolic reflector or another device in the overall assembly. Figure 1 is for illustrative purposes only.

2 SOW, Figure 12, Page 17 Figure 12 on page 17 also shows an interface between the Motion Controller and a Customer-supplied WARBIRD Radar Processor. The commands from the Radar Processor to the

Controller are given as Two Axis Attitude (Rate or Position) Commands. Aside from the IMU, the radar processor is the only other interface to the Motion Controller shown in this figure.

However, in Table 3 on page 16, the Radar

Processor is not listed as one of the principal components of the Motion Control System. In the Concept of Operations described in Section

6.2.1, a user interface operated by the air crew is described, and targeting information entered by the crews “is provided to the MCS via a network link”.

2 a. SOW, Item 6.2.3, Table 3 page 16 and Figure 12, Page 17

Is the Radar Processor intended to serve as the interface between the Motion Controller and the

“network” that includes any user interfaces?

If necessary, the Radar Processor can serve as an interface.

2 b. SOW, Item 6.2.2, Table 3 page 14 and Figure 11, Page 15

In order to translate targeting information entered by the user into cueing commands for the MCS, it appears necessary to have a GPS-enabled IMU or another source of AHRS information in order to perform the coordinate transformations.

Are these transformations being performed in

NRL-supplied hardware?

If necessary, this transformation can be performed by government hardware.

2 c. SOW, Item 6.2.3, Figure 13, Page 18 a. Where is the AHRS data output shown in

Figure 13 being sent? It does not show as a

Motion Controller input in Figure 14.

b. Is this IMU actually GPS enabled?

a. Figure 13 is depicting the interface, not the connectivity.

b. GPS may be obtained from the IMU or other government hardware.

2 d. SOW, Item 6.2.3, Figure 12, Page 17 a. Depending on the data rate of the communications between the Radar Processor and the Motion Controller, the position and rate commands sent to the motion controller could be corrected for aircraft attitude at the Radar

Processor, which would eliminate the need for an

IMU as part of the Motion Control System.

b. Has NRL given any consideration to this approach?

a. The current Radar Processor design does not implement this feature as part of its specifications.

b. If the efficacy of this concept could be demonstrated, NRL would consider adding this feature to the Radar

Processor.

3.

Is it reasonable to assume the final payload components can be integrated with the gimbal at factory location during gimbal FAT for performance testing and tuning, or should we plan on either developing a mass mock-up of the or receiving one from NRL? Equipment needed is Power Amplifier or Mock-up.

The offeror would need to provide a mass mock-up in the event that the power amplifier is not available for performance testing and tuning.

4. Regarding Cooling:

4 a. Is it anticipated that the Cooling Plate will be supplied and or designed by NRL? The reason for this question is that the overall power dissipation is dominated by the Power Amplifier which is also a GFP item. Related to Topic 3 above, the cooling plate or mockup would also be needed.

The offeror would need to provide cooling pates and hoses.

NRL will use with its own cooling pump and coolant.

4 b. Additionally, the motion system design will also need to account for the liquid cooling hoses routed to the moving parts. Please identify the hose diameter, type and flow rate to be used for the design.

The offeror and NRL shall bilaterally determine these specifications during the design review.

5. Additional questions regarding this requirement. Vendors need to ensure that additional questions regarding this requirement are submitted by November 22 at 10:00AM to the assigned Contract Specialist.