JPH0213874A - Distance tracking jamming apparatus - Google Patents

Abstract

PURPOSE:To detach not only tracking on a radar side but also manual tracking by visual observation by moving transmission timing while the levels of a plurality of dummy echoes are changed at random. CONSTITUTION:A receiving radar wave signal is stored in a frequency memory circuit 3. A gate circuit 4 takes out the signal stored in the frequency memory circuit 3 in the timing moving a plurality of dummy echoes from a real echo at every input pulse while the taken-out signal is modulated in amplitude at random on the basis of the control signal of a random amplitude control circuit 9 by an amplitude modulation circuit 10 to be transmitted as a jamming transmitting wave. The tracking gate on a radar side is detached by said jamming wave signal and the confirmation of the real echo by a radar operator is made impossible.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a distance tracking jamming device that performs self-defense jamming against a target tracking radar, and in particular, it relates to a distance tracking jamming device that performs self-protection jamming against a target tracking radar. The present invention relates to a system that provides incorrect information in terms of distance to a tracking radar by performing so-called stalling, in which transmission is performed while shifting the target.

[Conventional technology]

FIG. 3 is a configuration diagram of a conventional distance tracking and jamming device. In the figure, 1 is a receiving antenna (receiving means), 2 is an RF amplifier, 3 is a frequency memory circuit (frequency memory means), 4 is a gate circuit, and 5 6 is a disturbance timing control circuit, 6 is an RF power amplifier, 7 is a transmitting antenna (transmission means), 8 is an input wave detector, 20 is a delay extraction means, and the gate circuit 4.
It consists of a disturbance timing control circuit 5 and an input wave detector 8.

Next, the operation will be explained. The radar wave signal received by the reception air vA1 is amplified by the RF amplifier 2, and is input to the frequency memory circuit 3. In the zero frequency memory circuit 3, the input signal is stored as a high frequency.

The interference timing control circuit 5 issues an interference wave transmission command signal to the gate circuit 4 according to the stay width, stay speed, and steal type of the pseudo echo to be transmitted based on the input wave arrival timing from the input wave detector 8. Output. In response to this transmission command signal, the gate circuit 4 takes out the stored signal from the frequency memory circuit 3, and this stored signal is amplified as a disturbance signal by the RF power amplifier 6 and transmitted from the transmitting antenna as a disturbance transmission wave.

By performing the above operation for each input pulse and moving the disturbing pseudo echo away from the true echo on the time axis, distance tracking by the tracking radar can be removed.

[Problem to be solved by the invention]

Conventional distance tracking interference devices remove the distance tracking of the tracking radar by the above operation, and are very effective when the radar side is in automatic distance tracking mode, but when the radar side changes the operation mode. and manual tracking mode, especially A.
If a scope is used, the operator can easily see the movement between the true target echo and the false echo of the interfering wave, so there is a problem in that manual tracking by visual inspection is powerless. Note that the A scope is a radar scope whose X axis represents distance and whose Y axis represents reception level.

This invention was made in order to solve the problems of the conventional ones as described above. The object of the present invention is to obtain a distance tracking interference device that can make radar tracking impossible even in the above mode.

[Means to solve the problem]

The distance tracking and jamming device according to the present invention is configured to move the pseudo-jamming echo so that the tracking gate of the radar moves away from the true target, and transmit the pseudo-jamming echo so that the level of the pseudo-echo changes randomly within the steel. be.

[Effect]

The distance tracking jamming device according to the present invention disables automatic tracking by moving the jamming pseudo echo from the true echo, and also changes the level of the pseudo echo randomly, so it is easy to use for the tracking radar operator. It is possible to make it impossible to distinguish between true target echoes and false echoes.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a distance tracking and jamming device according to an embodiment of the present invention, in which 1 is a receiving antenna, 2 is an RF amplifier, and 3
is a frequency memory circuit, 4 is a gate circuit, 5 is a disturbance timing control circuit, 6 is an RF power amplifier, 7 is a transmitting antenna,
8 has an input wave detector, 9 has a built-in random signal generator,
A random amplitude control circuit outputs a random amplitude control signal in synchronization with the disturbance timing control signal, and 10 is an amplitude modulation circuit that changes the signal level using the amplitude control signal.

Next, the operation will be explained. The radar wave signal received by the receiving antenna 1 is amplified by the RF amplifier 2 and stored in the frequency memory circuit 3. Gate circuit 4 at the timing to move multiple pseudo echoes from the true echo for each input pulse.
extracts the signal stored in the frequency memory circuit 3.

The extracted signal is randomly amplitude-modulated by an amplitude modulation circuit 10 using a control signal from a random amplitude control circuit 9, amplified by an RF power amplifier 6, and transmitted as an interfering transmission wave from a transmitting antenna.

The above interference signal can disable the tracking gate on the radar side and also make it impossible for the radar operator to confirm the true echo.

In the above embodiments, the circuits 9 and 10 for randomly modulating the amplitude of pseudo echoes were shown, but as shown in FIG. You can also use it as

In FIG. 2, the steal count determination circuit 11 measures the number of pseudo-echo steals from the start of jamming wave transmission, and in the initial stage of jamming wave transmission, transmits at maximum output without performing random amplitude modulation, and disables automatic radar tracking. The main purpose of sending is that. On the radar side, if automatic tracking is removed,
Attempt to track the true target using manual tracking. On the other hand, the steal number determination circuit 11 determines the preset number of steals, and when the steal reaches a predetermined number, outputs a drive signal to the random amplitude control circuit 9, and transmits a pseudo interference wave whose level changes randomly. do. By switching this interference mode, the radar operator cannot distinguish between false echoes and true echoes.

〔Effect of the invention〕

As described above, according to the distance tracking interference device according to the present invention, since the transmission timing is moved while randomly changing the levels of a plurality of pseudo echoes,
This has the effect of not only removing automatic tracking on the radar side but also removing visual manual tracking.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a distance tracking obstruction device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing another embodiment of the present invention.
FIG. 3 is a block diagram of a conventional distance tracking and interference device, and FIG. 4 is a diagram showing the state of a radar A scope according to an embodiment of the present invention. In the figure, 1 is a receiving antenna, 2 is an RF amplifier, 3 is a frequency memory circuit, 4 is a gate circuit, 5 is an interference timing control circuit, 6 is an RF power amplifier, 7 is a transmitting antenna, 8 is an input wave detector, 9 10 is a random amplitude control circuit, 10 is an amplitude modulation circuit, 11 is a steal number determining circuit, 12 is a true echo, 13 is a pseudo echo, and 20 is a delay extraction means.

Claims (1)

[Claims] (1) Receiving means for receiving radar waves; frequency memory means for storing the received radar waves as high-frequency signals; and a timing for storing the stored signal in the frequency memory means at a timing later than the reception timing of the radar waves. A distance tracking and jamming device comprising a delayed extraction means for extracting the delayed signal and a transmission means for transmitting the delayed signal as a jamming pseudo echo, characterized by comprising a random amplitude control circuit for randomly changing the pseudo echo level. Distance tracking jamming device.