RU2349963C2 - Scaled-down short-distance radar simulator - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: simulator includes receiving and sending antennas, controlled delay line, controlled attenuators, interference generator, PC control, thus enabling to simulate signals returned from location object, as well as potential interference effecting the test item considering actual real-time interaction dynamics of short-distance radar and location object.

EFFECT: improved integrity of simulated signals effecting the test device.

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Description

The present invention relates to the technique of short-range radar and can be used to study the functioning, testing and measurement of parameters of devices of short-range radar systems (RBL) in the laboratory.

A known installation scheme (US patent No. 4969819 A, 11/13/1990) containing a transceiver antenna system, high-frequency amplifiers, a master oscillator, a noise generator and a mixer.

The disadvantages of this installation are:

1. The signal reflected from the target is simulated with a fixed time delay corresponding to a zero range to the target. This circumstance does not allow simulating the operation of SBRLs with a range selection function due to the use of various types of modulation of the emitted signal (IM, LFM, etc.).

2. Simulation of Doppler bias by amplitude modulation of a high-frequency signal by sound frequency voltage leads to distortion of the signal structure and to an inadequate (unreliable) response of the device under study.

3. In the circuit for simulating the reflected signal (receiving antenna, high-frequency amplifier, modulator, mixer, high-frequency amplifier, transmitting antenna), it is not possible to adjust the level of the high-frequency signal supplied to the device under study, which makes it impossible to determine the threshold sensitivity level.

4. The inability to control the parameters of the signals supplied to the device under study in real time, taking into account the dynamics of convergence with the goal.

The objective of the invention is to create a setup that allows with a high degree of reliability to simulate the signals acting on the device under study, taking into account the real dynamics of convergence with the location object.

The essence of the invention lies in the fact that the proposed installation includes: a controlled microwave signal delay line, controlled attenuators and a control computer with a built-in parallel I / O expansion board.

The work of the invention is illustrated by a block diagram (drawing), where the following notation is accepted:

1 - transmitting antenna,

2 - receiving antenna,

3, 4- high-frequency amplifiers,

5 - adder high-frequency signals,

6 - attenuator,

7 - controlled delay line,

8 - attenuator,

9 - control computer

10 - high frequency generator,

11 - interference generator.

The proposed installation allows you to simulate the signal RBSL reflected from the location, and acting on the RBSL interference.

The signal reflected from the location object is simulated as follows. The signal emitted by the RRSS test product through the receiving antenna 2 and the high-frequency amplifier 3 is fed to the signal input of the controlled delay line 7, where it is delayed by the time corresponding to the current range to the target (reflecting object), from the output of the delay line, the signal is supplied to the controlled attenuator 6, which serves to control the level of the simulated reflected signal. From the output of the attenuator 6, the signal goes to the first input of the high-frequency adder 5. From the output of the adder 5, the signal goes to the input of the high-frequency amplifier 4, from the output of which, through the transmitting antenna 1, the signal goes to the tested SBRL product.

Interference acting on the SBRL product is simulated as follows. The interference generator 11 modulates the high-frequency generator 10, the output signal of which is fed to the input of a controlled attenuator 8, which serves to control the level of interference. From the output of the attenuator 8, the noise enters the second input of the high-frequency adder 5, from the output of which the sum of the interference and the signal reflected from the target through the amplifier 4 and the transmitting antenna 1 is fed to the tested SBRL product. The host computer 9, based on the given initial data on the conditions for the use of the tested RBSL product (meeting parameters with the location object and the interference situation), calculates the parameters of the signal reflected from the target (level and delay) and the noise level at each discrete point of the path and controls the delay line 7 and the corresponding attenuators 6 and 8 in real time.

The signal modeled in this way, in terms of its amplitude, frequency, and phase characteristics, fully corresponds to the real RBSL signal reflected from the real target, and can be used to test various RBSL products, including those with a range selection function, for example, with pulse or frequency modulation.

The implementation of the invention. The proposed installation is implemented as part of an automated complex of semi-natural modeling. The controlled signal delay line with a total electrical length of 200 meters is composed of fifteen pieces of coaxial cable of various lengths, the longest section has a length of 100 meters, each subsequent section is 2 times shorter. The four “younger” segments are made in strip lines, the length of the shortest segment is 6 mm, it determines the discreteness of modeling the distance to the target. Fifteen high-frequency switches are controlled from a computer by a parallel fifteen-digit binary code and set the current delay line length to 200 meters with a resolution of 0.006 meters. The controlled attenuators are microwave resistor dividers, switched by electronic keys on a command from the computer also by a parallel binary code, their regulation range is 60 dB, the resolution is 0.2 dB.

The speed of control from a computer allows you to simulate a change in the distance to the location object at a speed of up to 2000 m / s.

Claims (1)

Installation for semi-natural modeling of near radar systems, containing the receiving and transmitting antennas, high-frequency amplifiers, a high-frequency generator, an interference generator and a high-frequency adder, characterized in that it is equipped with a controlled signal delay line, two controlled attenuators and a host computer with an integrated circuit board parallel I / O expansion, while the receiving antenna is connected to the signal input of the controlled delay line through the first high-frequency amplifier, the output of which connected to the signal input of the first controlled attenuator, the output of which is connected to the first input of the high-frequency adder, the output of which through the second high-frequency amplifier is connected to the transmitting antenna, the noise generator is connected to the modulating input of the high-frequency generator, the output of which is connected to the signal input of the second controlled attenuator, the output of which is connected to the second input of the high-frequency adder, and the control computer with the integrated expansion board for parallel input-output is connected to the control The inputs of the controlled attenuators and the controlled delay line.