JY-8 Radar
Encyclopedia
The JY-8 is a mobile 3D air surveillance, target acquisition
and interception control radar
system operating in the C-band
. It can be employed as the main radar sensor for an automated tactical defence system, or can be used as an independent radar. The system uses advanced signal/data processor techniques
and is fully solid state
with the exception of the magnetrons
and thyratron
s of the transmitters.
/transmitter/receiver
shelter, operations shelter, maintenance shelter and tow truck
. The complete system is air/sea transportable and can be assembled within one hour.
The system is designed to make use of amplitude
comparison for height finding. With the aid of two computers, it is able to provide automatically accurate real-time 3D information on targets. Frequency
diversity is used to increased detection probability. Other features include digital
MTI
, clutter
map, automatic residue map and CFAR
.
A multibeam antenna assembly, mounted on the transmitter/receiver shelter and rotating at 3/6 rpm, is employed to form a group of stacked beams. RF power is generated by two transmitters and is fed to a power dividing network and then illuminated to the reflector via a waveguide
assembly and feed array, creating a group of individual beams stacked vertically to form a wide cosecant squared pattern. In reception, both individual and combined beams are employed, 11 beams are formed by a receive network connected with an 11 channel diversity receiver. The received signals are sequentially mixed, amplified, detected and finally sent for data processing.
The system is manufactured by the East China Research Institute of Electronic Engineering(ECRIEE)/No.38 Research Institute /华东电子工程研究所（中国电子科技集团公司第三十八研究所).
Target Acquisition
In the military, target acquisition denotes any process that provides detailed information about enemy forces and locates them with sufficient accuracy to permit continued monitoring or attacking it....
and interception control radar
Radar
Radar is an object-detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio...
system operating in the C-band
C band
The C band is a name given to certain portions of the electromagnetic spectrum, including wavelengths of microwaves that are used for long-distance radio telecommunications. The IEEE C-band - and its slight variations - contains frequency ranges that are used for many satellite communications...
. It can be employed as the main radar sensor for an automated tactical defence system, or can be used as an independent radar. The system uses advanced signal/data processor techniques
Digital signal processing
Digital signal processing is concerned with the representation of discrete time signals by a sequence of numbers or symbols and the processing of these signals. Digital signal processing and analog signal processing are subfields of signal processing...
and is fully solid state
Solid state (electronics)
Solid-state electronics are those circuits or devices built entirely from solid materials and in which the electrons, or other charge carriers, are confined entirely within the solid material...
with the exception of the magnetrons
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field. The 'resonant' cavity magnetron variant of the earlier magnetron tube was invented by John Randall and Harry Boot in 1940 at the University of...
and thyratron
Thyratron
A thyratron is a type of gas filled tube used as a high energy electrical switch and controlled rectifier. Triode, tetrode and pentode variations of the thyratron have been manufactured in the past, though most are of the triode design...
s of the transmitters.
Transmitter
In electronics and telecommunications a transmitter or radio transmitter is an electronic device which, with the aid of an antenna, produces radio waves. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating...
System construction
The system has four major components: the main antennaAntenna (radio)
An antenna is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver...
/transmitter/receiver
Receiver (radio)
A radio receiver converts signals from a radio antenna to a usable form. It uses electronic filters to separate a wanted radio frequency signal from all other signals, the electronic amplifier increases the level suitable for further processing, and finally recovers the desired information through...
shelter, operations shelter, maintenance shelter and tow truck
Tow truck
A tow truck is a vehicle used to transport motor vehicles to another location , or to recover vehicles which are no longer on a drivable surface.Towing services are generally provided by an emergency road service operator...
. The complete system is air/sea transportable and can be assembled within one hour.
The system is designed to make use of amplitude
Amplitude
Amplitude is the magnitude of change in the oscillating variable with each oscillation within an oscillating system. For example, sound waves in air are oscillations in atmospheric pressure and their amplitudes are proportional to the change in pressure during one oscillation...
comparison for height finding. With the aid of two computers, it is able to provide automatically accurate real-time 3D information on targets. Frequency
Frequency
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...
diversity is used to increased detection probability. Other features include digital
Digital
A digital system is a data technology that uses discrete values. By contrast, non-digital systems use a continuous range of values to represent information...
MTI
MTI
MTI may stand for:* MTI, Message Type Indicator.* MTI Consulting, a consulting firm based in Bahrain.* MTI Consultancy, Machwuerth Team International Group, a consultancy based in Germany.* Magyar Távirati Iroda, a Hungarian news wire agency....
, clutter
Clutter
Clutter may refer to any of the following:*Excessive physical disorder** Clutter , a confusing or disorderly state or collection, and possible symptom of compulsive hoarding** A type of light pollution...
map, automatic residue map and CFAR
Constant false alarm rate
Constant false alarm rate detection refers to a common form of adaptive algorithm used in radar systems to detect target returns against a background of noise, clutter and interference.Other detection algorithms are not adaptive...
.
A multibeam antenna assembly, mounted on the transmitter/receiver shelter and rotating at 3/6 rpm, is employed to form a group of stacked beams. RF power is generated by two transmitters and is fed to a power dividing network and then illuminated to the reflector via a waveguide
Waveguide
A waveguide is a structure which guides waves, such as electromagnetic waves or sound waves. There are different types of waveguides for each type of wave...
assembly and feed array, creating a group of individual beams stacked vertically to form a wide cosecant squared pattern. In reception, both individual and combined beams are employed, 11 beams are formed by a receive network connected with an 11 channel diversity receiver. The received signals are sequentially mixed, amplified, detected and finally sent for data processing.
The system is manufactured by the East China Research Institute of Electronic Engineering(ECRIEE)/No.38 Research Institute /华东电子工程研究所（中国电子科技集团公司第三十八研究所).
Specifications
- C - Band
- Antenna beamwidthBeamwidthIn telecommunication, the term beamwidth has the following meanings:1. In the radio regime, of an antenna pattern, the angle between the half-power points of the main lobe, when referenced to the peak effective radiated power of the main lobe....
: 0.55° (horizontal), 0.9° (vertical) - No. of receive beams: 11
- RPM: 3/6 rpm
- PowerPower (physics)In physics, power is the rate at which energy is transferred, used, or transformed. For example, the rate at which a light bulb transforms electrical energy into heat and light is measured in watts—the more wattage, the more power, or equivalently the more electrical energy is used per unit...
: 800 kW x 2 (peak) - PulsePulse (signal processing)In signal processing, the term pulse has the following meanings:#A rapid, transient change in the amplitude of a signal from a baseline value to a higher or lower value, followed by a rapid return to the baseline value....
width: 3-3.3 μs - PRFPulse repetition frequencyPulse repetition frequency or Pulse repetition rate is the number of pulses per time unit . It is a measure or specification mostly used within various technical disciplines Pulse repetition frequency (PRF) or Pulse repetition rate (PRR) is the number of pulses per time unit (e.g. Seconds). It...
: 36,500 Hz - Azimuth coverage: 360°
- AltitudeAltitudeAltitude or height is defined based on the context in which it is used . As a general definition, altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The reference datum also often varies according to the context...
coverage: 25 km - Range: up to 350 km (max)
- ElevationElevationThe elevation of a geographic location is its height above a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface ....
: up to 20° - Accuracy: 500m (range); 0.3° (azimuth); 600m (RMS) at 185 km range (height)
- Target resolutionOptical resolutionOptical resolution describes the ability of an imaging system to resolve detail in the object that is being imaged.An imaging system may have many individual components including a lens and recording and display components...
: 1000m (range); 0.6° (azimuth) - Track capacity: 36 tracks
- Other reported names
- Type 383 (unconfirmed service Type designation)