China's all-solid-state airborne active phased array radar (internal information)

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China's all-solid-state airborne active phased array radar (internal information) [Copy link]

China's all-solid-state airborne active phased array radar (internal information)

Author: Unknown Source: Internet Views: 19 Published: 2006-7-20 11:59:03 Leaked Post China's All-solid-state Airborne Active Phased Array Radar (Internal Data) Name: 328/328A All-solid-state Airborne Phased Array Radar System: All-solid-state active array, single pulse, pulse compression Band: X Research and Development Unit: Institute of Electronics, Chinese Academy of Sciences, Changfeng Machinery Factory, 25th Institute of the Second Academy of the Ministry of Aerospace, Shanghai Institute of Electronic Physics, China Leihua Electronics Research Institute and other scientific research institutions Research and Development Time: Started in 1993 and completed in 1999 The first phase plan: 328 All-solid-state Airborne Phased Array Radar Research and Development Purpose: Study All-solid-state Airborne Active Phased Array Radar Current Status: September 2002 has developed to the second phase: Can be equipped for trial use: 328A All-solid-state Airborne Phased Array Radar Technical Features: 　　328A is the first all-solid-state active phased array radar developed by many scientific research departments for the Air Force. Its main technical achievements are: integration and batch production capabilities of RF power amplifiers, intermediate amplifiers, mixers, frequency multipliers, phase shifters and switches. 　　The 328A all-solid-state airborne phased array radar system has the functions of terrain following, terrain avoidance, ground mapping and air-to-ground ranging. In addition to the antenna array and shared power supply, the system also has six sealed components. The antenna array structure contains hundreds of plug-in RF micro-components, RF and DC integrated devices and cooling devices. Each micro-component is installed on a square grid with an interval of 0.517λ. The RF micro-component is a transmitter/receiver composite unit, and each component can transmit and receive 9600 MHz energy. The transmitter excitation and local oscillator power are evenly distributed to each component from the signal generator through a common feed system. The S-band signal output by the signal generator is multiplied to 9600 MHz in the component, and the 2235 MHz local oscillator signal is plated to 100 MHz in the component, and the difference frequency is 510 MHz with the 9600 MHz signal. 　　The 328A all-solid-state airborne phased array radar system uses pulse compression technology to obtain good resolution with sufficient sensitivity. The transmitter excitation signal can work in pulse compression mode, or pulse compression transmission can be combined with non-pulse compression transmission. This allows good resolution at both short and long distances in terrain avoidance, terrain mapping and air-to-ground ranging. 　　The 510 MHz intermediate frequency output of the micromodule is combined in the receiving integrated device according to the specified weighted distribution to obtain good sidelobe characteristics. The micromodule has a total of six separate circuit substrates. The intermediate frequency amplifier and modulator are made separately and combined on the mixer/transmitter-receiver conversion switch and pulse power amplifier substrates respectively. The interconnection of each circuit is achieved by welding gold wire mesh on the microstrip line. 　　The micromodule has a total of two coaxial lines. One is an S-band input, which gives 2.05 milliwatts at 2360 MHz when transmitting (transmitter excitation); 2.05 milliwatts at 2235 MHz when receiving (local oscillator excitation). The other coaxial line is connected to the integrated device combination network to transmit the 510 MHz intermediate frequency signal. 　　The conversion between the transmitter and the local oscillator excitation signal is completed before the RF distribution system, so only one S-band common feeder is required. For pulse compression operation, the S-band input is linearly modulated from 2360.75 to 2359.25 MHz in a 1.95 microsecond period during transmission. For non-pulse compression operation, the input during transmission is a short pulse (0.24 microsecond) with a center frequency of 2360 MHz. During the receive cycle, regardless of the operating state, the S-band input is a continuous wave signal of 2235 MHz. 　　The S-band preamplifier is a two-stage wideband transistor amplifier that can provide a gain of about 11.7 dB for the S-band input in both operating states. The S-band transmit and receive switch connects the amplifier output to either the transmit phase shifter or the receive phase shifter according to the conversion signal. 　　The phase shifter includes four digital phase shifting elements, which are controlled by the output of a four-stage continuous counter. The maximum digit represents a 45° phase shift in the S-band. The phase shifter can therefore provide any phase shift between 0 and 90° in increments of 5.04°. Due to the subsequent quadrupling, a total phase shift of 360° is available at the X-band output. The continuous counter is switched by the row and column inputs at each pulse repetition frequency and is cleared by a "reset" pulse just before receiving a new phase input. The receiving phase shifter is driven by the complementary output of a logic circuit which feeds both the transmitter and receiver phase shifters. 　　The pulse power amplifier consists of a number of transistor amplifier stages with a minimum gain of 23 dB at 2360 MHz. The output of this amplifier is the quadrupling of the harmonic of the input varactor diode. 　　The radiating element of the micromodule is a half-wavelength dipole fed by a slotted balun which provides the necessary transformation between the single-ended microstrip line and the balanced two-conductor antenna feed. The impedance matching of the dipole is chosen so that the mismatch is minimized within ±45° in all planes. Performance data Operating frequency 9600MHz Local oscillator frequency 9100MHz Receiver type Secondary frequency conversion Pulse pressure ratio 105:1 Antenna size 53cm diameter, hexagonal antenna Number of array elements XXX (this item is not disclosed for the time being) Array element arrangement Hexagonal Transmitter device transistor Five times the frequency Transmit power (this item is not disclosed for the time being ) Phase shifter (this item is not disclosed for the time being) Type X-bit diode (this item is not disclosed for the time being) Feeding method S-band common feed Display 13.3cm intuitive storage tube, terrain following display and terrain avoidance and ground mapping display Antenna array element 　　　　　Peak output power 0.76W 　　　　　Transmitter gain 15.2dB 　　　　　Noise figure 16.8dB 　　　　　Transmit insertion phase 10.0° 　　　　　Receive insertion phase 10.5° 　　　　　Volume (this item is not disclosed for the time being) 　　　　　Weight 45g