International Journal of Engineering Research ISSN: 2319-6890)(online),2347-5013(print) Volume No.5 Issue: Special 6, pp: 1255-1258 20 May 2016 ISSN: 2231-5381 doi: 10.17950/ijer/v5i6/026 Page 1255 INS/GPS Data Interface Using MIL-1553b Protocol in Airborne Radars Amith S Patil, Arathi Pillai, D Aishwarya, Mrs. Priyadarshini M Dept. of CSE, Cambridge Institute of Technology, Bangalore. India Amith.12cs009@citech.edu.in, Arathi.12cs015@citech.edu.in, Aishwarya.12cs030@citech.edu.in, Priyadarshinim.cse@citech.edu.in Abstract— INS/GPS data interface using MIL1553B protocol to detect the target through scanner from airborne radars where the navigation data (Navdata) is received from INS/GPS. The values longitude, latitude, azimuth and elevation of the target are given to the scanner to focus on the target through positioner. With respect to the value of longitude, latitude, azimuth and elevation (i.e., Navdata) the graph is plotted. Even the image of the target can be acquired. Taking data from INS/GPS navigation system every 20ms and commanding mechanical scanner for radar pointing operators. Keywords— INS/GPS, MIL-STD-1553, scanner, radar. I. INTRODUCTION MIL-STD-1553 is a military standard that defines the electrical and protocol characteristics for a data bus. A data bus is used to provide a medium for the exchange of data and information between various systems. It is similar to what the personal computer and office automation industry has dubbed a Local Area Network (LAN). [2] This guide provides an introduction to the MIL-STD-1553 data bus, its history, applications, and use. It describes:  The physical elements that make up the bus.  The protocol, including the message formats, word types, and command and status words.  Status word bits and mode commands and their definitions and use, both from the remote terminal and bus controller perspective.  Issues such as bus loading, major and minor frame timing, and error recovery. II. LITERATURE SURVEY  MIL-STD-1553, hardware specifications. Characteristics for a data bus. ARINC 629 limitations. [2]  ARINC 429,708,629 AND IEEE 1394B existing systems specifications and history. Realistic implementations, the high amount of data bus traffic analysis. [1]  ARINC 429 existing systems limitations, challenges and bandwidth analysis. [3]  ARINC 708 existing systems limitations and signal deterioration. [4]  IEEE 1394B existing systems limitations, isochronous channels and bandwidth analysis. [5] III. EXISTING SYSTEMS 1. ARINC 429 : “Digital Information Transfer System (DITS),” also known as Aeronautical Radio INC.(ARINC) is the technical standard for the predominant avionics data bus used on most higher end commercial and transport aircraft. It defines the physical and electrical interfaces of a two wire data bus and a data protocol to support an aircraft's avionics local Area Network. ARINC 429 is the most widely used data bus standard for aviation. Electrical and data format characteristics are defined for a two- wire serial bus with one transmitter and up to 20 receivers. The bus is capable of operating at a speed of 100 kbit/s. [1] 2. ARINC 708 : ARINC 708 is a specification for airborne pulse Doppler weather radar systems primarily found on commercial aircraftman 708 uses a data transfer method using transformer coupled Manchester encoded signal, like the MIL-STD-1553 protocol. Termination of the bus is essential for good signal quality. Furthermore, the bit stream is continuous, requiring good resynchronization to the bit stream. Data frames are 1600 bits long with the header portion of the frame consisting of parameters such as range, tilt, gain, status, etc. The data portion is organized into 512 range-bits per scan angle value. Each range bit contains a color value to indicate the intensity at that position. Settings for the ARINC 708 system is typically controlled using an ARINC 429 interface. [1] 3. ARINC 629 : ARINC 629 was introduced in May 1995 and is currently used on the Boeing 777, Airbus A330 and A340 aircraft. The ARINC 629 bus is a true data bus in that the bus operates as a multiple-source, multiple sink system. That is, each terminal can transmit data to, and receive data from, every other terminal on the data bus. This allows much more freedom in the exchange of data between units in the avionics system. The true data bus topology is much more flexible in that additional units can be fairly readily accepted physically on the data bus. A further attractive feature of ARINC 629 is the ability to accommodate up to a total of 128 terminals on a data bus