A. K. Rutkowski

High resolution IFMs

In this paper, three type of IFM (instantaneous frequency measurement) systems are presented. Classical IFM, consisting of directional couplers and power dividers, has been modified by applying phase shifters. Two other IFMs are also described. A diode ring was used in one IFM and only power dividers in another. Output signal conversion techniques are detailed. These IFMs, which can reach a frequency resolution better than 1 MHz, were examined practically.

11-bit digital frequency discriminator for the P/L band

This article refers to high resolution digital frequency discriminators DFDs. An interesting structure of the microwave phase discriminator MPD was described. It has been built in microstrip technique onto single substrate. The power splitting network was equipped with additional wideband phase shifter. It was done in order to shape DFD characteristics. Thanks to design of each of the discriminators microwave components and carefully worked out evaluation algorithm, an 11-bit frequency resolution was achieved. The accuracy of the manufactured discriminator is better than /spl plusmn/0.6 MHz over the frequency range of 0.76-1.27 GHz.

Analysing of GSM Signals by Means of IFM Receiver

This article concerns application of instantaneous frequency measurement IFM receiver for monitoring of telecommunication signals. The investigations were performed with the aid of two microwave frequency discriminators MFD built in microstrip technique. The experimental kit enabled to measure of parameters of the mobile phones and GSM base stations signals. Such information is very useful, for instance, for quick control of operation correctness of telecommunication and other microwave devices.

Protection of radar against Anti-Radiation Missile using single electromagnetic decoy

One of the possibilities of destruction of radiolocation stations is to use Anti-Radiation Missiles (ARM). This fact has forced further development of works on methods of missile dissuasion from the microwave emission source by using electromagnetic decoys (traps), which emit signals with the structure similar to the structure of signals transmitted by the being protected radar. This work presents the results of the analyses which indicate that there is the possibility of disrupting the process of guiding a missile of ARM type even using a single electromagnetic decoy. The effects of the analysis will be used for creation of a system which consists of a bigger number of decoys.

Monoimpulsowy zespół namierzania nadajników mikrofalowych jako element systemu obrony aktywnej

Praca naukowa finansowana cześciowo przez Narodowe Centrum Badan i Rozwoju w latach 2012-2018 jako Projekt Rozwojowy Nr DOBR/0040/R/ID1/2012/03.

Design of the software radar signal generator using LabVIEW

The design of the software radar signal generator using LabVIEW environment and the universal hardware NI PXI - 5673 has been presented in the paper. The stream up to four pulses with linear frequency modulation (LFM) and different durations and gaps between them can be generated in RF band up to 6.6 GHz. Other generation mode i.e. single, repeated and continual can be triggered manually or automatically. The configuration of the LFM pulses is carried out manually using software front panel.

Two - dimensional portable short range of L band noise radar demonstrator

The structure and principle of operation of the portable two - dimensional (2D) short range noise radar demonstrator has been presented in the paper. This demonstrator estimates distance to the target and its azimuth position. These coordinates are evaluated from modulus and argument of a cross correlation function being computed on the basis of reference signal and received echo signal. There were also presented results of observation carried out in real condition in the open air.

Direction Finding Devices with 8×8 Butler Matrix and Eight - Element Antenna Arrays

The paper concerns the devices for an instantaneous direction finding of radiation sources or targets illuminated by microwave signals. The investigated devices were made up of classic 8times8 Butler matrix and with 8 directional antennas placed on the circle and in the sector. There are presented the results of computer simulations which took into consideration dimensions of real double ridged antennas and non-zero distances between their phase centres.

About capabilities of objects location using microwave radiometer

Microwave thermal radiation of various objects can be used for their location and identification. Thermovision in the infrared range enables to find temperature distribution on the object surface while microwave radiometers allow to recognize hot objects placed for instance, behind thermal shields. In the paper the authors present selected results of the research on passive system for discovering live creatures based on microwave radiometer. Performed experiments showed that assumptions were correct and the radiometer is very useful for such applications.