JPS5844367A - Jamming apparatus for radar - Google Patents

Abstract

PURPOSE:To obtain a radar jamming apparatus having a simple constitution by obtaining radar jamming signals in an electronic way by using pattern signals having similar amplitude variations to those of aerial radiation patterns in place of an aerial. CONSTITUTION:By generating signals similar to aerial radiation patterns in an electronic circuit, a radar jamming apparatus can be constituted without rotating an antenna. That is, high-frequency pulse signals generated by an oscillator 4c are given to a modulator 4a and modulated therein by pattern signals generated from a pattern signal generator 4b, and become jamming signals. These jamming signals are amplified by a power amplifier 4, given to an aerial 1, and radiated in the air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radar deception device.
Pport Measure) analyzes the spectrum of the radar signal received, determines the effective radio wave specifications, and then emits the same radio waves to interfere with the radar. If a large number of i-devices are set up, it becomes impossible for the 4M side to determine which one is the real radar, making it impossible to effectively sabotage the radar. - Concerning equipment.

Conventional radar deception devices include airborne*iI and transmitters! Il! I made the actual radar and @'s configuration χ, and put this into KS.
It is used to interfere with M. That is, in FIG. 1, the transmitter (2) generates a high-frequency pulse signal with the same frequency, pulse width, and pulse repetition rate as the radar to be deceived, and sends this to the antenna (1) via the rotary joint (1a). to supply power. This antenna ■ rotates in the same way as the actual radar antenna (not shown), and sJ! to the ELM (not shown) side. A jamming signal similar to that radiated from the original antenna is radiated, and this jamming signal is received by the KSM. In addition,(
3) is the power supply. Since the conventional radar device is configured as described above, it has a mechanical rotation mechanism, and the circuit scale is large and complicated, so it is difficult to manufacture a large number of them. The drawback was that it was inconvenient.

This invention was made in view of the conventional problems, and it is possible to electronically obtain a radar deception signal by using a pattern signal that changes in the same way as the antenna radiation pattern instead of the above-mentioned antenna. The purpose of the present invention is to provide a radar deception tiii device that uses the following methods.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In Fig. 0, (1) is an antenna, (4C) is an oscillator that generates a high-frequency pulse with the same frequency, pulse width, and pulse repetition rate as the radar, and (4b) is A pattern signal generator (41) that generates a voltage with amplitude changes similar to the radar antenna radiation pattern changes the high frequency pulse signal from the oscillation 1l11 (4C) with the pattern signal from the pattern signal generator (4b). (4) is a power amplifier that amplifies the input signal from the modulator (4). Oh, the aerial 41■ in this embodiment does not need to be large in order to obtain a predetermined beam width like in the case of radar, and may be omnidirectional. Of course, it does not need to be rotated. Therefore, a very simple antenna is sufficient.

Next, the operation will be explained.

If a radar signal is received on the EβM side, the
As shown in FIG. 3, the high frequency pulse is amplitude modulated by the antenna radiation pattern. Therefore, if a signal similar to such an antenna radiation pattern is generated on an electronic surface path, radar deception can be achieved without rotating the antenna.
The present invention is advantageous in that it can be used to construct a device.

In FIG. 3, T^ is the antenna plane l1ih period, BW is the antenna beam width, and TP is the pulse repetition period.

oscillation! ! The Tomotaka Hatonami pass signal generated at (4C) is applied to the modulator (41), where the pattern signal generator (4C)
It is modulated by the pattern signal from m)), resulting in an interference signal as shown in Figure 11g3. This interference signal increases the power @!
(4) is amplified, added to the antenna ■, radiated into space, and received by the 18M side. By the way, this ti-pupil is a radar pseudo signal from this device when the KSM side is monitoring the radar. It can also be used as an ILSM training device by sending more and more KSMk to train it to interfere.

In addition, by changing the output peak value of the pattern signal generator over time using a programmer, it is possible to simulate the movement of the radar, and the IsM side Cζ
It is also possible to make a judgment that the radar is moving, and in this case, the deception effect increases. As described above, according to the radar deception device according to the present invention,
Since a pattern signal having an amplitude change similar to that of the antenna radiation characteristic is electronically generated, the rotation mechanism of the antenna can be omitted, and the entire configuration becomes simple. the result,
It becomes possible to easily manufacture such a device, and it becomes possible to arrange a large number of such devices, making it difficult to interfere from the 13M side. ' Also, there is no need to use a narrow beam antenna as an antenna, which allows the antenna to be made smaller. First, since the transmitting section can be made low-power, the transmitting section can be made into a semiconductor, resulting in a small, lightweight, and easily transportable device, and the position of the device can be easily changed, increasing the effectiveness of deception. do.

Furthermore, the reliability is the same as above because the circuit f#A4m11 structure is eliminated and it is possible to use an all-solid-state circuit, and the state in which the radar is moving can be simulated by changing the amplitude over time. It has the effect of increasing the effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional radar deception Wi device, and FIG. 2 is a block diagram of a radar deception device according to an embodiment of the present invention. Figure J3 is a diagram showing the temporal change in the received power of the radar signal received by KSM. (4b)... Noreen signal generator゛, (4C)...
Oscillator, (43)...Modulator, ■Antenna. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (υ A pattern signal generator that generates a pattern signal with an amplitude change similar to the radiation characteristic of the radar antenna, an oscillator that generates a transmission signal, and a modulator that modulates the transmission signal with the /f turn signal. , and an antenna for transmitting the output of this modulator.