Chapter 7
Non-coherent and Pseudo-coherent
Radar Systems
Operation principle of non-coherent radar system (NCRS) is based on antenna radiation of electromagnetic waves into direction of an object of interest and receiving
of reflected energy, its processing and information obtaining on parameters of this
object, i.e., its coordinates—azimuth, elevation angle and range. NCRS structure is
depicted in Fig. 7.1.
Electromagnetic waves are generated in transmitting device (TRD), channelized
(constrained) in waveguide duct and through antenna switch (AS) directionally radiated by antenna (9A) into a space in direction to objects. Reflected from objects, radio
waves through antenna-feeder unit come to a receiver (Rcv) and after transformation
and information highlighting on object into terminal unit—display (indicator) unit
(DU). Through matching unit (MU) in NCRS, the information is introduced from
systems and complexes matched with it. Signals from object attitude sensors (AAS)
are applied for controlling of antenna driving and stabilization mechanism (ADSM).
NCRS set composition and purpose of main components:
Antenna block provides:
• radiation into space of HF pulses coming from transmitter;
• receiving of signals, reflected from ground or aerial objects;
• beam traveling in azimuth;
• beam traveling in elevation angle;
• gyroscopic beam stabilization in horizontal or other specified plane.
Transmitting/receiving block provides:
• generation of powerful HF pulses and its transmission into the radar waveguide
duct;
• processing of pulses, reflected from objects, into intermediate-frequency pulses,
its amplification and detection;
• automatic frequency (tuning) control (AFC) of local heterodyne;
• temporary automatic gain (adjusting) control (AGC) of receiver;
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
D. A. Akmaykin et al., Theoretical Foundations of Radar Location
and Radio Navigation, Springer Aerospace Technology,
https://doi.org/10.1007/978-981-33-6514-8_7
149
Non-coherent and Pseudo-coherent
Radar Systems
Operation principle of non-coherent radar system (NCRS) is based on antenna radiation of electromagnetic waves into direction of an object of interest and receiving
of reflected energy, its processing and information obtaining on parameters of this
object, i.e., its coordinates—azimuth, elevation angle and range. NCRS structure is
depicted in Fig. 7.1.
Electromagnetic waves are generated in transmitting device (TRD), channelized
(constrained) in waveguide duct and through antenna switch (AS) directionally radiated by antenna (9A) into a space in direction to objects. Reflected from objects, radio
waves through antenna-feeder unit come to a receiver (Rcv) and after transformation
and information highlighting on object into terminal unit—display (indicator) unit
(DU). Through matching unit (MU) in NCRS, the information is introduced from
systems and complexes matched with it. Signals from object attitude sensors (AAS)
are applied for controlling of antenna driving and stabilization mechanism (ADSM).
NCRS set composition and purpose of main components:
Antenna block provides:
• radiation into space of HF pulses coming from transmitter;
• receiving of signals, reflected from ground or aerial objects;
• beam traveling in azimuth;
• beam traveling in elevation angle;
• gyroscopic beam stabilization in horizontal or other specified plane.
Transmitting/receiving block provides:
• generation of powerful HF pulses and its transmission into the radar waveguide
duct;
• processing of pulses, reflected from objects, into intermediate-frequency pulses,
its amplification and detection;
• automatic frequency (tuning) control (AFC) of local heterodyne;
• temporary automatic gain (adjusting) control (AGC) of receiver;
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
D. A. Akmaykin et al., Theoretical Foundations of Radar Location
and Radio Navigation, Springer Aerospace Technology,
https://doi.org/10.1007/978-981-33-6514-8_7
149