Radar target simulator

IPC classes for russian patent Radar target simulator (RU 2267798):

G01S7/40 - Means for monitoring or calibrating

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Radar target simulator / 2267798

The radar target simulator has a super high frequency module consisting of successively connected arrangements: an automatic regulator of power, an impulse modulator, an amplitude modulator, a switch of the power level and a digital attenuator, a communication line, a horn antenna, a group of keys, the first semiconductor storage, an interface of a multiplex bus, a synthesizer of Doppler frequencies, a second semiconductor storage and a multiplying digital-analogue converter. The increasing of the accuracy of the installation of the output power is provided due to possibility of its correction by way of changing the intensity of the amplitude modulation of the super high signal for each meaning of the value of fading.

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FIELD: the proposed invention refers to the field of radiolocation and may be used in control-measuring apparatus of Doppler radiolocation systems.

SUBSTANCE: the radar target simulator has a super high frequency module consisting of successively connected arrangements: an automatic regulator of power, an impulse modulator, an amplitude modulator, a switch of the power level and a digital attenuator, a communication line, a horn antenna, a group of keys, the first semiconductor storage, an interface of a multiplex bus, a synthesizer of Doppler frequencies, a second semiconductor storage and a multiplying digital-analogue converter. The increasing of the accuracy of the installation of the output power is provided due to possibility of its correction by way of changing the intensity of the amplitude modulation of the super high signal for each meaning of the value of fading.

EFFECT: increasing accuracy of the installation of the output power of the radar target simulator.

1 dwg

The present invention relates to the field of radar and can be used in the control and measuring equipment Doppler radar systems (radar).

Known measuring apparatus, which comprises a block microwave, communication and horn antenna connected via a communication line to the output of the microwave. Block microwave includes the automatic power adjustment, pulse and amplitude modulators, three attenuator signal attenuation and generators Doppler frequencies [Technical description of the KIA. IRI "AGATE", 1999].

The disadvantage of this apparatus is the inability to automate the process control radar parameters: setting Doppler signal, power output level, the inclusion of modulators is carried out manually using the controls block the microwave.

Also known automated instrumentation, which includes a radar simulator for the target (RIC), selected as a prototype, containing a microwave module, consisting of series-connected devices automatically adjust the power pulse modulator, an amplitude modulator, switch power level and a digital attenuator, the input device for automatic adjustment of the power and pulse modulator I is are respectively the inputs of the microwave pulse modulation radar simulator target, communication line, a horn antenna, connected via a communication line to the digital output of the attenuator, the control module digital attenuator consisting of a group of keys, the outputs are connected to corresponding inputs of the control digital attenuator, programmable permanent memory (EPROM), discharges the output bus which is connected to the inputs of the respective keys, and interface multiplexed bus, the respective outputs of which are connected to the address inputs of the PROM and to the control input of the pulse modulator, an amplitude modulator and switch the power level, the synthesizer module of the Doppler frequency, the output of which is connected to the input of the amplitude modulator, and a multiplex control bus connected to the bus interface control module digital attenuator and to the bus control module synthesizer Doppler frequencies. [Product description ACIA. IRI "AGATE", 2001]

This equipment allows for the automation of process control radar parameters. The disadvantage of it is the low accuracy of the output power caused by the digital error attenuator due to the interaction of sections of the attenuator at microwave frequencies. So, even after calibration digital attenuator (codes calibrations are recorded in the EPROM) error set the Ki power output level in the range from 0 to minus 50 dB is ± 2 dB, and at lower levels even higher.

The purpose of the invention is to improve the accuracy of installation of the power output of the radar simulator target.

The objective is achieved due to the fact that radar simulator target containing a microwave module, consisting of series-connected devices automatically adjust the power pulse modulator, an amplitude modulator, switch power level and a digital attenuator, the input device for automatic adjustment of the power and pulse modulator are respectively the inputs of the microwave pulse modulation radar simulator goal line, horn antenna, connected via a communication line to the digital output of the attenuator, a group of keys, the outputs are connected to respective control inputs of the digital attenuator, first PROM, the bits of the output bus which is connected to the inputs of the respective keys, the interface multiplex bus, the respective outputs of which are connected to address inputs of the first EPROM and to the control input of the pulse modulator, an amplitude modulator and switch the power level, synthesizer Doppler frequencies and the multiplex control bus, connected to the tire interface multiplexed bus and control synthesizer Doppler frequencies entered Deut is e EPROM, the address inputs of which are connected to the address inputs of the first EPROM, and multiplying digital to analog Converter (DAC), a control bus which is connected to an output bus of the second EPROM, an input connected to the output of the synthesizer Doppler frequency, and the output to the input of the amplitude modulator.

The drawing shows a block diagram of a radar simulator purpose, which includes:

1 - channel pulse modulation;

2 - input microwave;

3 - module microwave;

4 - the automatic power control;

5 - pulse modulator;

6 is the amplitude modulator;

7 - switch power level;

8 - digital attenuator;

9 - communication line;

10 - horn antenna;

11 - synth Doppler frequencies;

12 - multiplying DAC;

13 is a group of keys;

14 - the first EPROM;

15 - second EPROM;

16 interface multiplexed bus;

17 - multiplex control bus.

The microwave module 3 consists of the microwave path, comprising sequentially enabled the automatic power control 4, the pulse modulator 5, the amplitude modulator 6, the switch of the power level 7 and a digital attenuator 8. The input of the pulse modulator is the input of the pulse modulation 1 Ritsa. Input device for automatic adjustment of the power is input SHF 2 Ritsa. The digital output of the attenuator 8 is connected h is the cut line 9 with horn antenna 10. The input of the amplitude modulator 6 is connected to the output of the multiplying of the DAC 12. The control input of the pulse modulator 5, the amplitude modulator 6 and the switch of the power level 7 is connected with the corresponding outputs of the multiplex interface bus 16. The control inputs digital attenuator 8 is connected to the outputs of the group of keys 13, the input of which is connected to the corresponding bits of the output bus of the first EEPROM 14, and the address inputs of the first and second EPROM 14, 15 connected to respective outputs of the interface multiplex bus 16. The output bus of the second EPROM 15 is connected to the control bus multiplying the DAC 12, the input connected to the output of the synthesizer Doppler frequencies 11, a control bus which is connected to the tires interface multiplex bus 16 and multiplex control bus 17.

Work Ritsa is as follows. Input SHF 2 signal carrier frequency radar. If the radar operates in pulsed mode, the input of the pulse modulation 1 is a delayed start signal transmitter radar. In microwave module 3 input signal is stabilized and normalized to power with a device for automatic adjustment of the power of 4, then, if the radar operates in pulsed mode, is subjected to pulse modulation using pulse modulator 5, then enters the balanced amplitude mo is ulator 6 suppressed carrier frequency, on the output side of which are formed of the frequency offset from the carrier frequency by the value of signal frequency synthesizer Doppler frequencies 11, which is fed to the input of the amplitude modulator 6 through multiplying DAC 12. Then this Doppler signal is sent to switch the power level 7 with microwave amplifier, providing work Ritz-mode high-power, and, further, the digital attenuator 8 to set the output power. Output digital attenuator 8 a signal through the communication line 9 is supplied to the horn antenna 10 for its radiation to simulate the signal reflected from the target. Using multiplex control bus 17 connected to the electronic computing machine (computer), and interface multiplex bus 16 provides a control pulse and amplitude modulators 5, 6, switch the power level 7 and a digital attenuator 8. Control digital attenuator 8 is carried out through the group of keys 13 and the first EPROM 14, which converts the code of attenuation in decibels coming to the address inputs of the EPROM 14, code control digital attenuator. These code values are written to the EPROM 14 when calibrating digital attenuator 8. This allows a rough calibration of the output power Riza. Accurate calibration of the output power of the matrix is due to a change in g is ubina amplitude modulation by changing the level of the modulation signal, coming from the output of the synthesizer Doppler frequency 11 through multiplying DAC 12 for each value of attenuation. To do this, use the multiplying DAC 12, on the control bus which arrives code to the output bus of the second EPROM 15. The magnitude of this code determines the gear ratio multiplier of the DAC 12, and hence the level of the modulation signal. The address inputs of the EPROM 15, combined with the address inputs of the EPROM 14, enters the code, the attenuation in decibels. Output codes in the EEPROM 15 is written with a precise calibration of the output power of the matrix.

Thus, the introduction in the known device multiplying the DAC and the second EPROM with these relationships can improve the accuracy of output power Riza due to the possibility of its correction by changing the depth of amplitude modulation for each value of attenuation.

Prototype testing Riza performed on the proposed technical solution, showed that the setting error of the output power was reduced to ±0.3 dB against ±2 dB in the prototype.

Radar simulator target containing a microwave module, consisting of series-connected devices automatically adjust the power pulse modulator, an amplitude modulator, switch power level and a digital attenuator, the input of the mouth of the STS automatic power control and pulse modulator are respectively the inputs of the microwave pulse modulation radar simulator target, communication line, a horn antenna, connected via a communication line to the digital output of the attenuator, a group of keys, the outputs are connected to corresponding inputs of the control digital attenuator, the first programmable permanent memory, the bits of the output bus which is connected to the inputs of the respective keys, the interface multiplexed bus, the respective outputs of which are connected to address inputs of the first programmable permanent storage device and to the control input of the pulse modulator, an amplitude modulator and switch the power level, synthesizer Doppler frequencies and the multiplex control bus, connected to the tire interface multiplexed bus and control synthesizer Doppler frequencies, characterized in that it entered the second programmable permanent memory device, the address inputs of which are connected to the address inputs of the first programmable permanent memory device, and the multiplying d / a Converter, a control bus which is connected to an output bus of the second programmable permanent memory device, the input connected to the output of the synthesizer Doppler frequency, and the output to the input of the amplitude modulator.