Abstract:

The ESM system is used to measure the parameters of radar emissions in the operating frequency range along with pulse width, pulse repetition frequency, signal strength, antenna scan period, direction of arrival etc. These systems are installed in warships, air crafts and submarines. The parameters are to be made available to operator during peace and wartime. In the modern ESM systems, these parameters are to be measured instantaneously for tactical purposes. Different techniques are used for measuring different parameters. The parameters except direction of arrival use simple measurement techniques where as direction of arrival uses amplitude comparison technique and are very critical.

                  The ESM system consists of system antenna, Receiver, Processor and Display subsystem. Receiver is used for measuring radar parameters within 1.2 micro seconds. These parameters include frequency, pulse width, PRF, amplitude, scan period etc. The receiver measures all these parameters pulse by pulse and provides the data in digital form. DOA measurement is one of the important parameter to be measured. For this purpose, amplitude comparison technique is used. DOA computation PCB along with other hardware is required for DOA measurements. This DOA PCB is to be designed and developed using FPGAs.

The project broadly includes following steps.

a) Design of DOA computation circuit

b) Fabrication of PCB

c) Assembly of the PCB

d) Code development of DOA algorithm using VHDL

e) Testing of code

f) Testing of PCB

g) Report generation

Briefly, we can describe the project as follows. It involves design, development and manufacturing of DOA computation PCB for ESM system. It involves design and manufacture of electronic circuits using digital ICs, FPGAs and interface circuits. The design is to be verified for its functionality before fabrication. BEL standard processing techniques will be used in the work. After successful hardware functionality, software for FPGAs using VHDL coding will be developed. The hardware and software will be then integrated and tested for its final checks.