1、t Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Engineering Specifications and Standards Department (Code 93), Naval Aia Engi- neering Center, Lakehurst, NJ 08733, by using the self-addressed
2、Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. . . MIL-N-QJ678B 58 = 7777906 0171813 1 = 4 .- - , MIL-N-81678B(AS) 14 February 1977 SUPERSEDING MILITARY SPECIFICATION NAVIGATIONAL SET, OMEGA KtL-N- 816 7 8A(AS) AN/ARN-99 (VI 3 January
3、 1974 This specification has been approved by the Naval Air Systems Command, Department of the Navy. 1. SCOPE 1.1 Scope - The equipment covered by this specification shall perform a navigation function by utilizing information from the Very Low Frequency global OMEGA navigation system, automatically
4、 and continuously with minimum operator assistance. according to specific applications, for other navigational and display equipments when the necessary computer program and interfaces are provided. The set also has the capability of providing processing functions, 1.2 Classification - The equipment
5、 covered in this specification shall consist of the following items: Receiver-Computer Group OR-l33(V) /URN 3.5.1 Control-Indicator ID-1776/ARN-99(V) . Bases, Mounting; and Mounts,Vibration (for use with electronic equipment in aircraft) MIL-W-5088 Wiring, Aircraft, Installation of Provided by IHSNo
6、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-_- u-. MIL-N-lb7B 58 m 7777906 OL7Ll4 3 m MIL -N -8 167 8B (AS ) al 0 rl 4 u al W al k u cd m u m rl X w g rl u (d !Il e $ 4 W u m g m al 0 80 rl m 3 al P U 2 v) a P a 1 O 8 a !3 Y w al u b al ? rl al o 2 do w O rl u cd
7、 0 bD 4 m al m al u al rl a V $ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I 2. APPLICABLE DOCUMENTS (Cont d) pilitarv (Cont d) MIL-C-6781 MIL -P - 7 7 88 MIL -M-7 7 93 MIL -E - 1755 5 MIL-T - 18303 MIL -N - 183 O 7 MIL-T-23103 .MzL-C-25050 MIL-
8、H-46855 MIL-M-81288 MIL-C-81511 MIL-N-81675 MIL-C-81774 Control Panel; Aircraft Equipment, Rack or Console Mounted Plate, Plastic, Lighting Meter, Time Totalizing Electronic and Electrical Equipent and Associated Repair Parts, Preparation for Delivery of Test Procedures; Preproduction and Acceptance
9、 for Aircraft Electronic Equipment, Format for Nomenclature and Identification for Electronic, Aeronautical and Aeronautical Support Equipment including Ground Support Equipment Thermal Performance Evaluation Colors, Aeronautical Lights and Lighting Equipnent, General Requirements for Human Engineer
10、ing Requirements for Military Systems, Equipment and Facilities Mounting Bases, Flexible Plastic Foam Connectors, Electrical, Circular, High Density Quick Disconnect, Environment Resisting, and Accessories, General Specification for Navigational Set, Omega AN/ARN-99(V)l Control Panel, Aircraft , Gen
11、eral Requirements for Naval Air Systems Conmiand AR -5 Microelectronic Devices Used in Avionic Equipent , Procedures for Selection and Approval of Versatile Avionic Shop Test System Compatibility General Requirements for Versatile Avionic Shop Test Program, General Requirements for Maintainability o
12、f Av ionic s Equipment and Systems, General Requirements for Testing, General Requirements for AR-8 AR-9 AR-10 AR-34 Failure Classification for Reliability . -3 - . 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-8 167.88 (AS) 2. APPLICABLE D
13、OCUMENTS (Cont d) Naval Ordnance Systems Command WS -8506 Requirements for Digital Computer Program Documentation STANDARDS Military MIL -STD-2 03 MIL-STD-250 MIL -STD -4 11 MIL-STD-46 1 .- . MIL -STD -704A Notice 2 MIL-STD-781 Notice 1 MIL-STD -783 MIL -CTD -785 MIL-STD-794 MIL-STD- 1472 MS-17322 F
14、edera 1 FED -STD -5 95 Aircrew Station Controls and Displays for Fixed Wing Aircraft Aircrew Stat ion Controls and Displays for Rotary Wing Aircraft Aircrew Station Signals Electromagnetic Interference Characteristics, Requirements for Equipment Electric Power, Aircraft, Characteristics and Utilizat
15、ion of Reliability Tests, Exponential Distribution. Legends for Use in Aircrew Stations and on Airborne Equipment Reliability Program for System and Equipment Development and Production . Parts and Equipment, Procedures for Packaging and Packing of Human Engineering Design Criteria for Military Syst
16、ems, Equipnent and Facilities Meter, Time Totalizing, Miniature, Digital, 115 Volt, 400 Hertz Colors -4 - I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-N-8167B 58 7799706 0171817 9 m MIL-N -8 167 8B (AS ) 2.1.1 Availability of Documents (a)
17、When requesting specificat ions, standards, drawings, and publications, refer to both title and number. Copies of this specification and applicable npccifications except WS-8506 required by contractors in connection with specific procurement functions may be obtained upon application to the Conmiand
18、ing Officer, Publications and Forms Center, Code 105, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. (b) Copies of Weapons Specification WS-8506 may be obtained upon application to the Commanding Officer, U.S. Naval Ordnance Station, Central Technical Document Of fice, Louisville, Kentucky 402
19、14. Reference the Invitation for Bid (In) or Request for Quotation (RFQ) procurement number in your request. 3. REQUIREMENTS 3.1 Preproduction - This specification makes provisions for 3.2 Parts and Materials - In the selection of parts and preproduction testing. materials fulfillment of major desig
20、n objectives shall be the prime consideration. In so doing, the following shall govern: Microelectronic Technology shall be considered, and microelectronic items shall conform to requirements specified herein. conform to Specification MIL-E-5400. accordance with Specification AR-10 and as outlined i
21、n Specification MIL -E -5400. When previously produced models of this equip- ment did not use nonrepairable subassemblies, the design shall not be changed to employ nonrepairable assemblies without the approval of the procuring activity. 3.2.1 Nonstandard Parts and Materials Approval - Approval for
22、the use of nonstandard parts and materials (including electron tubes, transistors, and diodes) other than microelectronic devices shall be obtained as outlined in Specification MIL-E-5400. Microelectronic devices shall be approved as outlined in AR-5. electronic Modular Assemblies shall meet the req
23、uirements of Specifi- cation AR-5. 3.2.3 Modules - The electronic portions of the equipment shall be functionally modularized in accordance with Specification AR-10. Plug-in subassemblies shall be so designed as to preclude improper interchange or insertion. (a) (b) Other parts and materials require
24、ments shall (c) Nonrepairable subassemblies shall be used in (d) 3.2.2 Microelectronic Modular Assemblies - When used, Micro- -5 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- -. - MIL-N-Lb78B 58 7799706 OL7LL O MIL-N-81678B (AS) 3.3 Design and C
25、onstruction - The equipment shall conform to all the applicable requirements of Specification MIL-E-5400 for design, construction and workmanship, except as otherwise specified herein. 3.3.1 Total Weight - The total weight of the equipment, excluding cables, shall be a minimum consistent with good d
26、esign. Table II is a list of maximm system weights. 3.3.2 Reliability - The contractor shall conduct a relia- On a reorder from a bility program using MIL-STD-785 as a guide. supplier who has previously produced the equipment, the program previously used may be continued unless otherwise indicated i
27、n the contract or order. 3.3.2.1 Operational Stability - The equipment shall operate with satisfactory performance, continuously or intermittently for a period of a least 3000 hours without the necessity for readjustment of any controls which are inaccessible to the operator during normal use. 3.3.2
28、.2 Operatinn Life - The equipment shall have a minimum total operating life of 20,000 hours with reasonable servicing and . replacement of parts. specified by the contractor. Parts requiring scheduled replacement shall be 3.3.2.3 Reliability in Mean Time Between Failure (MTBF) - The equipent, includ
29、ing any Built-in-Test provisions, shall have 1000 hours of mean (operating) time between failures when tested and accepted as outlined under the requirements of Paragraph 4.4.3. 3.3 2.4 Time Totalizing Meter - The Receiver-Computer Group shall include a time totalizing meter conforming with the appl
30、icable requirements of Specification MIL-M-7793 and MS-17322-10. Meter shall be located on Interconnecting Box J-3213/N. 3.3.3 CablinP and Connections 3.3.3.1 Cables and Connectors - The equipment shall provide for use of cables and connectors in accordance with Specification MIL-E-5400. Quick disco
31、nnect circular connectors shall conform to the applicable requirements of Specification MIL-C-81511. 3.3.3.2 Interconnection Cablin Input Power Voltage: 115 f 1.0 VAC, 400 Hz, and Room ambient (25C * 10C) Room ambient up to 9% relative humidity 27.5 k 0.5 VDC -10- - -. . Provided by IHSNot for Resal
32、eNo reproduction or networking permitted without license from IHS-,-,- MIL-N-Lb7B 58 m 9799906 0171823 4 m 3.3.10 Service Conditions - The equipment shall operate satisfactorily under any of the environmental service conditions or reasonable combination of these conditions as specified in Specifi- c
33、ation MIL-E-5400 for Class 2 equipment, except as modified herein. 3.3.10.1 Vibration - The Receiver-Computer Group shall conform to the vibration requirements of Specification MIL-E-5400 curve IV with vibration isolators, and to curve I with an amplitude not exceeding 3g without isolators. cume N.
34、The Control-Indicator shall conform to curve IV except the amplitude shall not exceed 5g. The Antenna-Coupler shall conform to 3.3.10.2 Temperature-Altitude - The OR-l33(V)/URN Receiver- Computer Group and AS-2623/ARN-99(V) FILTER FILTER * COHBIKATIOXAL L - I J ALTONATIC SYhCHRO- I - SIZAIIOS U TIS(
35、I!;C, LUGIL OSCI IUTOR OFFSET Ahm FATE DR A-TO-D -SAVICATIOS -COW YAG%TlC HEADISC I BFCT POSITIOS - CORRELTIOSS TO: DEAD RECKONIN(; FIGURE 1 AIRBORXE OMEGA NAVKATIONAL - 17 o o ci L Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-N-Lb7B 58 m 777
36、9706 L7L3L 3 II I I I MIL-N-8 1678B (AS) * = ID- /ARN-99(V) ID- 17 7 6 /XRN-99 (V) * CRCSS-TRACK ERROk CCY2LTF.D TUCK AS3E EST1YAIED TIVE ESRGCTB COYRSF TO DFSTI!.ATIX * * - * = 10 FOR ZD-1776/ARN-99(V) 11 FOR ID- /ARN-99(V) AIRCRAF SYSTEMS 1 I ! * DESTINATIOS CPP.DI!i2.Trf- A,C POSITIOS CALE!.3AR D
37、ATE RATE AID SLRCF S;dTiS AYA1 LASLE - i4 r; * * KE %CA ? GFFFE * vP;ISis DLSTISATIOS, VFLCSITY uu:,1ZIc * I - I- Manuai Heading * ?anua Velocity Jrk Manual Heading-Velocity* c * XIhD URiCTION 6 VELOCIT ONEGA LIhT OF PCSITI0:;S CFCDZTIC LOSCIICDE -1 DATE W GREAT CIRCLE BEARIX DISPLAY STATS - 1 Manua
38、l Heading-Veloci ty* I I- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-83678B 58 9777706 0373832 5 m MIL-N-8 1678B (AS) 3.4.7.2 Random Noise: The Navigational Set shall be capable of using signals in the presence of random noise (measured in
39、 a 100 Hertz bandwidth). Performance of the Navigational Set, measured at the output of the burst measurement filters with 50WV/meter of noise shall be: - SNR MEAN DIFFERENCE FROM ABSOLUTE STANDARD DEVIATION +20 db +10 db O db -10 db -15 db f 1 CEC * 1 CEC i 1 CEC f 2 CEC f 3 CEC 1.5 CEC 1.5 CEC 2 C
40、EC 3 CEC 5 CEC 3.4.8 Dynamic Phase Tracking - Each tracking filter shall be capable of tracking a steady-state phase velocity input of 200 knots (along the baseline) without velocity-aiding with a lag error nt to exceed one percent of a carrier cycle. characteristics of the set shall be such that it
41、 does not lose phase track under the following conditions: A vehicle traveling.along the baseline and the wind changing in magnitude from O knote to 140 knots in 60 seconds and in a direction parallel to the baseline. The 8cceleration characteristics of combined set and velocity aid input rhall be e
42、uch that the lag error does not exceed 5 percent of a carrier cycle per channel under the following condition: A vehicle traveling along the baseline at 1,000 knots, an error in measured rate input of less than 10 percent (velocity sensor external to the Navigational Set) and reversing its direction
43、 on a three-degree-per- recond turn. The Navigational Set shall recover from the effects of the above accelerations in less than two minutes after reaching a constant velocity. The requirements for dynamic phase tracking and measurement accuracy will be met for signal-to-noise ratios equal to or gre
44、ater than -15 db. The acceleration 3.4.9 Signal Acquisition - The equipment shall be capable of automatic signal acquisition under all signal amplitude conditions , signal-to-noise ratios and velocities specified herein. time shall not exceed 5 minutes under any of the signal conditions specified he
45、rein. the completion of synchronization, to meet the accuracy requirement of paragraph 3.4.7 of this specification. Acquisition Acquisition is defined as the time required after 3.4.10 VLF Propagation Corrections - The Navigational Set shall automatically provide phase corrections compensating for t
46、he phase variations between the OMEGA transmitting stations and the position of the aircraft. These phase corrections shall continuously update the lane position information. By inserting data (day, time of day, and position) prior to flight, no operator intervention or updating shall be required du
47、ring flight regardless of unplanned changes in flight paths. inserting fixed offset positionJin the AN/AN-99 (V)2 only, to compensate for oberved minor-errors in displayed position due to incorrect propagation predictions. by the campiter when the operator enters a new date and time. The operator eh
48、all have the capability of This offset shall autamatically be removed , -19- , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-PlIL-N-a167B 5 97777Ob 0171833 7 W Mn-N-81678B(A!) The method employed in generating the phase corrections shall have at le
49、ast the following accuracies: (a) The maximum difference of predicted value minus plot value for any hour of the day shall not exceed 30.0 cecs. (b) The mean of the differences over the twenty-four hour period shall not exceed 18.0 cecs. (c) The standard deviation of the differences shall not exceed 9.0 cecs. 3.4.11 Navigation - The
