RU180109U9 - Transceiver module of the C-band digital active phased array antenna - Google Patents

Abstract

The utility model relates to transceiving devices of microwave frequency (microwave) oscillations, designed to operate as part of a digital active phased antenna array (AFAR) on-board C-band side-scan radar mounted on a spacecraft. The problem to which the claimed technical solution is directed is to create a transceiver module (GPS) of a digital active phased antenna array of an airborne satellite-based side-scan C-band radar. This task is achieved due to the fact that in the GSM the functions of modulation, amplification, transmission, radiation, reception and demodulation of signals, including digital-to-analog and analog-to-digital conversions, are implemented on the basis of microchips for Wi-Fi IEEE.802.11a in the 5 GHz band. The technical result provided by the given set of features is to increase the degree of integration of the device, reduce the weight and size characteristics, reduce power consumption, the ability to create multi-channel PPM in a single construct (up to 8 channels on one board), ensure the stability of radio technical characteristics and the required level of radiation resistance. 1 ill.

Description

The utility model relates to transceiving devices of microwave frequencies (microwave), designed to operate as part of a digital active phased array antenna (AFAR) on-board C-band side-scan radar mounted on a spacecraft (SC).

From the prior art [RU 157114 U1, H01Q 21/00 (2006.01), 03/19/2015] (prototype) a transceiver module of an on-board digital antenna array is known comprising a frequency grid synthesizer, a microwave power amplifier connected to an input of a transmit-receive switch (circulator), the first output of which is the microwave output of the transmitting part of the module and it is also the input of the receiving part of the module, the second output of the circulator through a low-noise amplifier is connected to the input of the analog-to-digital converter, the output of which is the digital output of the module, from characterized in that a frequency grid synthesizer with a digital phase-locked loop connected to a quadrature modulator is used, and a microcontroller is introduced, the input bus of which is the digital input of the module, and the output bus is connected to digital controlled inputs of the frequency grid synthesizer with a digital phase-locked loop , a quadrature modulator and an analog-to-digital converter, while the input of the digital reference signal for the phase-locked loop of the frequency of the grid synthesizer is is another of the digital input module.

The problem to which the claimed technical solution is directed is to create a transceiver module (PPM) of a digital active phased antenna array of a space-based C-band side-scan side-scan radar.

This task is achieved due to the fact that in the MRP functions of modulation, amplification, transmission, radiation, reception and demodulation of signals, including digital-to-analog and analog-to-digital conversions, are implemented on the basis of microchips for Wi-Fi IEEE.802.11a 5 GHz band.

The technical result provided by the given set of features is to increase the degree of integration of the device, reduce weight and size characteristics, reduce power consumption, the ability to create multi-channel PPM in a single construct (up to 8 channels on one board), ensure the stability of radio technical characteristics and the required level of radiation resistance.

MRP is a functional unit. Unlike most AFARs, it does not have a separate construct - up to eight anti-missile systems can be integrated into one electronic module.

The drawing shows a structural diagram of the PPM.

The MRP includes:

- 1 microchip ADP-DAC MAX 19707 (Maxim Integrated Products, Inc);

- 2 chip modulator-demodulator MAX2829 (Maxim Integrated Products, Inc).

On the data and control interfaces, the MRP is connected to the digital information processing subsystem.

Digital data from the information processing subsystem comes through the input-output data interface 3 to the inputs of digital-to-analog converters (DACs) 4 and 5. After conversion to the analog form through the input filters 6 and 7 of the microcircuit 2, the signals are fed to the inputs of the quadrature modulator 8, which receives the reference frequency from a local oscillator (frequency synthesizer) 9. A local oscillator with a frequency synthesizer provides the generation of a carrier frequency signal in the C-band. A separate advantage is the constant phase ratio of the carrier frequency signal and the 40 MHz reference frequency signal. This makes it possible to generate in-phase carrier signals in all the MRPs, provided that the reference frequency signals also come to them without phase shifts. From the output of the modulator through a programmable amplifier 10 and a band-pass filter 11, the transmitting signal is fed to the output of the PPM.

On the radio frequency interface, the PPM is connected to an output power amplifier for transmission and a low-noise power amplifier for reception.

The received signal through a band-pass filter 12 and a programmable amplifier 13 is fed to the input of the quadrature demodulator 14. The demodulated signals through the low-pass filters 15 and 16 are fed to the inputs of the analog-to-digital converters (ADCs) 17 and 18 of chip 1, after which the digital signals are fed through interface 3 into the subsystem of digital information processing.

The MAX2829 chip is designed for use in IEEE.802.11a (Wi-Fi, Radio-Ethernet) adapters.

The MAX2829 microcircuit is manufactured using 0.35 μm BiCMOS technology, which allows us to expect a fairly high radiation resistance and resistance to heavy charged particles (TZZ). The MAX 19707 microcircuit is made using 0.35 micron CMOS technology.

DAC and ADC are implemented in the form of a single chip MAX19707 (Maxim Integrated Products, Inc). The resolution of the DAC and ADC is 10 bits, the clock frequency is 40 MHz. This chip is selected among a wide variety of DAC / ADC chips for reasons of simplicity of interface with the MAX2829 chip and low power consumption (less than 100 mW). The bit depth of the DAC / ADC is redundant, for this area of application, the bit depth is 8 bits for the DAC and 4-6 bits for the ADC. Analysis of the available element base showed that the use of DACs and ADCs of lower bit depth does not give advantages in reducing the area of the printed circuit board and power consumption.

A fairly high radiation resistance to the full dose of radiation should be expected. However, resistance to TZC may not be sufficient, therefore, means should be provided to limit the current consumption to prevent the destruction of the chip in the event of a snap.

Claims (1)

Transceiver module of space-based C-band digital active phased array antenna, characterized in that the functions of modulation, amplification, transmission, radiation, reception and demodulation of signals, including digital-to-analog and analog-to-digital conversion, are implemented on the basis of microchips for Wi-Fi IEEE .802.11a of the 5 GHz band, manufactured using 0.35 μm BiCMOS technology and providing, due to technological features, a sufficiently high level of radiation resistance and resistance to heavy charged particles.

Images