• TECHNICAL FACILITIES FOR ENSURING SECURITY

    DRONE DETECTION IN URBAN ENVIRONMENT – THE NEW CHALLENGE FOR THE RADAR SYSTEMS DESIGNERS

    Security & Future, Vol. 1 (2017), Issue 3, pg(s) 114-116

    Small UAVs and micro-drones are becoming more and more available to the general public for leisure activities and exploited in commercial applications. However, there is growing concern for accidental or even criminal misuses of these platforms. Radar systems can provide good capabilities, especially at long ranges and poor visibility conditions. Design considerations for distributed millimeter wave radar networks, particular suitable for high density populated urban areas, are given in the report. Special attention is given to: The choice of suitable working frequency bands; The use of antenna beam-forming networks, based on proposed by the author Random Phased Radial Line Slot Antennas and correlation signal processing; The radar signal waveforms in order to obtain un-ambiguity autocorrelation function and small radar resolution volume, as well as to the use of the external coherency principles of Doppler detection.

  • TECHNICAL FACILITIES FOR ENSURING SECURITY

    PERSONAL COMMUNICATION NETWORKS WITH GLOBAL COVERAGEESSENTIAL FACTOR FOR THE SECURITY OF THE MODERN HUMAN SOCIETY

    Security & Future, Vol. 1 (2017), Issue 2, pg(s) 72-75

    The Personal Communication Systems with global coverage use Integrated Satellite-Terrestrial approach with Low Earth Orbit satellite constellations. The frequency reuse problems in such systems are discussed. The advantages of the implementation here the proposed by the author Space Correlated – Code Division Multiple Access are considered too. The principles of generation and synchronization of used Unique Pseudo Noise codes are shown. The system architecture of a IST PCN, based on the proposed by the author Spatial Correlation Processing – Random Phase Spread Coding technology for LEO,s terminal and feeder lines, is given too.

  • SCIENCE

    SPATIAL CORRELATED RADIOCOMMUNICATION TECHNOLOGIES – THE BULGARIAN CONTRIBUTION FOR A BETTER WORLD

    Science. Business. Society., Vol. 1 (2016), Issue 1, pg(s) 18-21

    Radiocommunication is among technology’s biggest contributions to mankind. It involves the transmission of information over a distance without help of wires, cables or any other forms of electrical conductors. On the other hand radiocommunication suffers some disadvantages. The growth of wireless network has enabled us to use personal devices anywhere and anytime. This has helped mankind to improve in every field of life but this has led many threats as well: Radio network has led to many security threats to mankind; Radio network could be jammed easy by the terrorists, enemies ets.; Radio frequency spectrum is limited natural resource; Frequency sharing among different radio systems and users is difficult task. This report represents in brief the authors efforts to solve above mentioned problems. The used common term is “spatial correlation technologies”, in particular Spatial Correlation Processing (SCP) – Random Phase Spread Coding (RPSC) and Spatial Correlated – Code Division Multiple Access (SC-CDMA). It is shown in the report too that the practical implementation of SCP-RPSC and SC-CDMA principles and technologies will solve many global telecommunication problems. The results of this 20 years long research activity will be a very strong Bulgarian contribution and way to a better world for the human mankind.

  • SPACE CORRELATED U-PN CODES – A POSSIBLE SOLUTION FOR THE NEW MICROWAVE COMMUNICATION AND RADAR SYSTEMS

    Machines. Technologies. Materials., Vol. 9 (2015), Issue 6, pg(s) 17-20

    A retrospective review of a new approach, named Space Correlated U-PN codes, is given in this report. It is particular useful as spread spectrum radio access technology in the mobile broadband communication and radar systems with integrated terrestrial – satellite positioning. The principles of U-PN codes generation, as well as the basic methods of their acquisition and tracking, are given too.

    The proposed SC-CDMA principle uses several space distributed sources of radio-signals. The signals are phase modulated by appropriate PN-codes. The Mobile Stations (MS) receive these signals by means of the well known CDMA technology. For this purpose the same PN- codes are generated and synchronized in the MS receiver. The sum(mod2) of these codes creates a new code, which we named U (Unique)- PN code. This code is used for spreading the information, transmitted by the MS. Similar approaches are used for generation of the Base Station (BS) U-PN codes. Proposals of realistic SC-CDMA mobile communication and SC-MRN radar systems, based on the well developed GPS navigation, are shown in the end of the report.

  • SCP-RPSC – THE KEY TECHNOLOGY FOR THE NEXT GENERATION MICROWAVE COMMUNICATION SYSTEMS

    Machines. Technologies. Materials., Vol. 9 (2015), Issue 6, pg(s) 13-16

    A retrospective review of a new technology, named SCP-RPSC, is given in this report. It is particular useful as the radio front end of the microwave communication systems with terrestrial and satellite positioning. SCP (Spatial Correlation Processing) technology includes additional pilot signal transmitted in the band of information signals and available in the receiver by one of the known methods of radio access. The receiver terminal is equipped with random phased antenna array. The random phase spread information and pilot signals correlate in a correlator. Its output signal at baseband is the recovered information signal. The application of SCP principle in transmit mode was named RPSC (Random Phase Spread Coding). The transmitted by the random phased antenna array signals have specific phase spread. It can be considered as random spatial coding. The advantages of the SCP-RPSC approach over classic microwave communication systems, based on phased antenna arrays, are shown. A list of possible communication applications as Satellite Digital Video Broadcasting , Inter Satellite Links, Feeder Lines, High Altitude Platform Systems, WIMAX, Aeronautical and Global Navigation Satellite Systems (GNSS) is given too.

  • DOMINANT TECHNOLOGIES IN “INDUSTRY 4.0”

    SCP-RPSC COHERENT TRANSPONDING SYSTEMS FOR IoT COMMUNICATIONS

    Industry 4.0, Vol. 2 (2017), Issue 1, pg(s) 25-28

    5th generation mobile networks, abbreviated 5G, are the proposed next telecommunications standards. 5G research and development also aims at improved support of machine to machine communication, also known as the Internet of Things, at millimeter waves. The move to these extremely high frequency bands, as well as the new requirements to the 5G network parameters, need new approach for the future technical systems solutions. One of those is the use of microwave coherent transponding system. Spatial Correlation Processing – Random Phase Spread Coding is a new technology in the field of microwave beam forming antenna theory, developed by the author one decade before. Its application in millimeter wave coherent transponding systems is proposed in this report. The system advantages are considered in details too.