JPS59143978A - Radar transmitter - Google Patents

Abstract

PURPOSE:To hamper electronic jamming by changing the variation cycle of an oscillation frequency at random. CONSTITUTION:A random signal of a random signal generation circuit 5 is aplied to a sample hold circuit 6 and sampled at a specified time by a timing signal from a timing circuit 7. Output of the sample hold circuit 6 is converted into a sine wave signal with the amplitude varying at random at each specified period by a servo amplifier 3 and a tuning mechanism 2 changes the oscillation frequency of a magnetron 1 at the speed proportional to the amplitude value of a signal from the servo amplifier 3. The variation cycle of the oscillation frequency of the magnetron 1 changes at random at a fixed periodical interval. This makes the projection of the oscillation frequency very hard to do thereby enabling the construction of a radar transmitter hampering electronic jamming.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radar transmitter that can change the transmission frequency.

As a conventional transmitter of this type, there has been one shown in FIG. 1 (7'I). In Figure 1, (11 is the magnetron for generating all microwave signals, (2) is the magnetron marked in 1).
- Tuning mechanism attached to fi+ (31 is M-11
a servo amplifier for driving the tuning mechanism +2+, (4
) is a constant voltage source for generating a constant vehicle pressure signal.

Next, the operation of conventional radar transmission will be explained using Figure 2. As shown in Fig. 2 (a), a constant voltage pulse (41) is a constant voltage signal. The same training mechanism t2i uses a servo amplifier (31 to 17) to adjust the excavation frequency of the magnetron mountain at a speed proportional to the 4-speed value of No. 17 at a constant simple and sinusoidal frequency as shown in Figure 2 (c) ic. The conventional radar transmitter is configured as described above, so the magnetron's light -h*I:
? 4 The period of change of the number is very uniform, and the excavation frequency can be easily identified as a radar-included system.
'F-There was a drawback of the temple being susceptible to all interference.

This invention has been made in order to overcome these drawbacks, and provides a radar transmitter with a low V-resistance system that randomly changes the change period of the 2-oscillation frequency and the V number, thereby preventing electronic interference (I7). be.

An embodiment of the present invention shown in FIGS. 3 and 4 will be described below. In FIG. 3, (11 to (31 are the same as in FIG. 1). (51 is a random signal generation circuit, which generates a signal whose voltage value changes randomly. The generation circuit (sample and hold circuit from 51 to sample g and hold its output for a certain period of time), (7) is to fully control the sample and link timing of the njJ sample and hold circuit (6). This is the timing circuit of
1.

The random (M number photogenerating circuit (5) is a noise generation circuit that utilizes the noise of a diode, etc., and its output signal ti4th
As shown in the figure (,), random French VCK is generated.

This random signal is applied to the sample hold circuit f6+, and the timing circuit (
It is sampled at 4f=fixed time by the timing signal from 71. As a result, as shown in FIG. 4(c), a signal in which the voltage value of the sampled random signal is held for a specified time is obtained as the output of the sample and hold circuit 61. The output of the sample and hold circuit (61) is outputted by the servo multiplier (31) as shown in FIG. 3(d). Ru.

The oscillation frequency of the magnetron fi+ is changed at a speed proportional to the amplitude value of the signal from the tuning mechanism (21 is iJ).As a result, the oscillation frequency of the magnetron (110
As shown in Figure 2(f), the change period of the optical radiation frequency is as follows:
It changes randomly over a certain period of time.

In this way, this invention fully controls the variation of the magnetron's oscillation frequency using random signals.
The change in the oscillation frequency is extremely irregular, and the rate
For Komiiso Iso, it is extremely difficult for the opponent's radar to have a child with a 9 oscillation frequency (n++r), and it is 1/(me.

It can be applied to radar transmitters that are less susceptible to electronic interference.

As described above, according to the present invention, the transmission frequency of the radar transmission system can vary irregularly throughout the circumference.
It has the advantage of being able to configure a Haleda transmitter to receive electronic interference.

4. [,'6 Simple explanation of the drawings Fig. 1 shows a conventional radar transmission image, Fig. 2 shows an output slope diagram of the radar transmitter shown in Fig. 1, and Fig. 3 shows an image of the radar transmitter according to the present invention. FIG. 4, which is a diagram showing an embodiment of the radar transmitter, is an output waveform diagram of the radar transmitter according to the present invention.

In the figure (11 is a magnetron, (21 is a tuning mechanism, (31 is a
Hasu□-Bo amplifier, (4) is a constant pressure bomb, (5) is a random signal optical circuit, (6) is a sample hold circuit, (
71fi timing circuit.

In Figure 9, -81S is indicated with the same reference numeral.

Agent Yu Kuzuno - Figure 1 Figure 2

Claims (1)

[Claims] In a radar transmitter that includes a magnetron that generates all microwave signals, a tuning mechanism that changes the excavation frequency of the magnetron, and a servo amplifier that controls the tuning mechanism, all random signals are generated. sample a random signal from the random signal generating circuit and the random signal generating circuit. A sample bold circuit that holds the output value for a certain period of time and a timing circuit that fully controls the sampling timing of the sample hold circuit are provided, and the sample hold signal from the sample hold circuit is sent to the magnetron via the servo amplifier. A rotor-transmitter characterized in that the frequency of change of the oscillation frequency of the magnetron is randomly changed by randomly changing the tuning (several rotational speeds) by applying the same amount of energy to the mechanism.