JPH07225265A - Monopulse receiver - Google Patents

Abstract

PURPOSE:To obtain the monopulse receiver in which only a delay device is used as a part to be adjusted and whose delay time can be adjusted precisely by a method wherein the output signal of a voltage-controlled transmitter is input simultaneously to two systems of superheterodyne reception systems. CONSTITUTION:A voltage-controlled transmitter 21 outputs a frequency-modulated signal whose central frequency is the same as that of input signals of received-signal input ends 1a, 1b, whose modulated-wave angular frequency is the same as that of a low-frequency oscillator 22 and whose maximum frequency shift is definite. The signal is input simultaneously to two systems of superheterodyne reception systems 10a, 10b by couplers 2a, 2b, it is controlled 3a, 3b, to a proper level, and frequency mixers 5., 55 output intermediate-frequency-modulated waves. The signal is controlled 6a, 6b again, a noise is removed by band-pass filters 8a, 8b, the signal is time-delayed by delay devices 9a, 9b, it is then phase-detected 15, and an unwanted signal is removed by a low-pass filter 16. Then, a signal which appears at a signal output end 17 becomes a direct current when the signal delay time of the reception systems 10a, 10b is equal. When the signal delay time is different, the signal has a ripple at an amplitude corresponding to the difference amount of the delay time. When the phase of the reception systems 10a, 10b is at 90 deg., the output signal becomes maximum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a radio wave direction finder,
The present invention relates to the configuration of a monopulse receiver used in a tracking radar device.

[0002]

2. Description of the Related Art FIG. 9 is a diagram showing the structure of a conventional monopulse receiver of this type. In the figure, 1a and 1b are reception signal input terminals, 2a and 2b are couplers, and 3a and 3b are voltage control. High frequency attenuators, 4a, 4b are low noise amplifiers, 5a,
5b is a frequency mixer, 6a and 6b are voltage controlled intermediate frequency attenuators, 7a and 7b are intermediate frequency amplifiers, 8a and 8b are band pass filters, and 9a and 9b are delay devices. 10a, 1
0b is the delay signal from the reception signal input terminals 1a and 1b.
It is a super-heterodyne receiving system composed of a and 9b. Reference numeral 11 is a control signal input terminal for controlling the voltage controlled high frequency attenuators 3a and 3b and the voltage controlled intermediate frequency attenuators 6a and 6b, and 12 is the superheterodyne receiving system 10 described above.
a, 10b are oscillators used as local signals, 13a,
Reference numeral 13b is an output signal monitor end of the superheterodyne receiving system, 14 is a phase shifter, 15 is a phase detector, 16 is a low-pass filter, and 17 is a signal output end. Reference numeral 18 is a high frequency signal oscillator, 19 is a pulse modulator, and 20 is a pulse generator for creating a control signal for the pulse modulator 19.

Next, the operation will be described. The high frequency signal oscillator 18 continues to oscillate at the same frequency as the signals input to the reception signal input ends 1a and 1b. The output signal of the high-frequency signal oscillator 18 is pulse-modulated by the pulse modulator 19 according to the output signal of the pulse generator 20. The pulse-modulated signals are simultaneously input to the two superheterodyne receiving systems 10a and 10b by the couplers 2a and 2b. If an appropriate control voltage is applied to the control signal input terminal 11, the pulse-modulated signal is level-controlled to an appropriate level by the voltage-controlled high frequency attenuators 3a and 3b, amplified by the low noise amplifiers 4a and 4b, and then frequency-controlled. Mixer 5a,
5b is input. On the other hand, the output signal of the oscillator 12 is also input to the frequency mixer 5b. The output signal of the oscillator 12 passes through the phase shifter 14 and is input to the mixer 5a. Therefore, the output signals of the mixers 5a and 5b become intermediate frequency pulse-modulated waves. The intermediate frequency pulse modulated wave is level-controlled again to an appropriate level by the voltage controlled intermediate frequency attenuators 6a and 6b, amplified by the intermediate frequency amplifiers 7a and 7b, noise is removed by the band pass filters 8a and 8b, and the delay device 9a, After being time-delayed at 9b, it is output to the output signal monitor terminals 13a and 13b. In the monopulse receiver, the signal delay times of the two superheterodyne receiving systems 10a and 10b need to be equal, but the signal delay times are displaced due to component variations, aging, component replacement, and the like. When the delay devices 9a and 9b are adjusted so that the signals appear at the two output signal monitor terminals 13a and 13b at the same time, the signal delay times of the two superheterodyne receiving systems 10a and 10b become equal. The output signals of the two delay devices 9a and 9b are phase-detected by the phase detector 15 to become pulse signals, and unnecessary signals are removed by the low-pass filter 16 and appear at the signal output terminal 17. In the monopulse receiver, the phases of the output signals of the two superheterodyne receiving systems 10a and 10b are 90.
It is necessary to be offset, but there are variations in parts, aging,
The phase relationship is shifted due to replacement of parts. Therefore, the phase shifter 14 is adjusted so that the output voltage of the signal output terminal 17 becomes maximum. After the above adjustment is completed, the high-frequency signal oscillator 18 is stopped and the signals from the monopulse antenna are input to the two reception signal input terminals 1a and 1b, whereby the monopulse angle measurement can be performed by the output voltage of the signal output terminal 17. .

[0004]

Since the conventional monopulse receiver is constructed as described above, there are two types of adjustment points for the monopulse receiver, that is, a phase shifter and a delay device, which makes the adjustment complicated. There were challenges. Further, the narrower the pulse width of the pulse-modulated signal, the more accurate the adjustment can be made. Therefore, there is a problem that the pulse modulator is required to have a high-speed operation type and the pulse modulator becomes expensive. If a narrow band filter is used as the band pass filter,
Since the output signal of the bandpass filter is greatly distorted, there is a problem that the signal delay time cannot be accurately adjusted even if a high-speed operation type pulse modulator is used.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a monopulse receiver having only a delay unit as an adjusting point, and further, a pulse modulator is not necessary and a narrow band bandwidth is required. It is an object of the present invention to obtain a monopulse receiver capable of accurate signal delay time adjustment even when using a bandpass filter.

[0006]

A monopulse receiver according to a first embodiment of the present invention is used as it is in two superheterodyne receiving systems without pulse modulation of an output signal of a voltage controlled oscillator controlled by a low frequency oscillator. In addition to inputting, the output signal of the oscillator is input to the local signal input ends of the two frequency mixers in the two superheterodyne receiving systems without passing through the phase shifter.

In the monopulse receiver according to the second embodiment of the present invention, the output signal of the high-frequency signal oscillator is not pulse-modulated through the amplitude modulator controlled by the low-frequency oscillator, and is simultaneously applied to the two superheterodyne reception systems. In addition to inputting, the output signal of the oscillator is input to the local signal input terminal of the frequency mixer in the two-system superheterodyne receiving system without passing through the phase shifter.

The monopulse receiver according to the third embodiment of the present invention is configured so that the output signal of the high frequency signal oscillator is directly input to the two superheterodyne receiving systems without pulse modulation, and the output of the voltage controlled oscillator is used. The signals are simultaneously input to the local signal input terminals of two frequency mixers in the two-system super-heterodyne receiving system.

The monopulse receiver according to the fourth embodiment of the present invention is constructed so that the output signal of the high frequency signal oscillator is directly input to the two superheterodyne receiving systems without pulse modulation, and the control signal input terminal Either the input signal or the output signal of the low-frequency oscillator can be selected as the control signal of the voltage-controlled high-frequency attenuator, and the output signal of the oscillator can receive two systems of super-heterodyne without passing through a phase shifter. It is configured to be input to the local signal input terminal of the frequency mixer in the system.

The monopulse receiver according to the fifth embodiment of the present invention is constructed so that the output signal of the high frequency signal oscillator is directly input to the two superheterodyne receiving systems without pulse modulation, and the control signal input terminal Either the input signal or the output signal of the low-frequency oscillator can be selected as the control signal of the voltage-controlled intermediate-frequency attenuator, and the output signal of the oscillator does not pass through the phase shifter. It is configured to be input to the local signal input terminal of the frequency mixer in the receiving system.

In the monopulse receiver according to the sixth embodiment of the present invention, the output signal of the oscillator whose oscillation frequency is equal to the difference between the transmission frequency of the nearest broadcasting station and the intermediate frequency of the super-heterodyne receiving system is used for the two systems of super-heterodyne. The configuration is such that two mixers in the receiving system are input to local signal input terminals.

[0012]

In the monopulse receiver according to the first embodiment of the present invention, the output signals of the two superheterodyne receiving systems are
The signal that has been frequency-modulated, and the signal that appears at the signal output end becomes DC if the signal delay times of the two super-heterodyne reception systems are equal, and if the signal delay times of the two super-heterodyne reception systems are different, the delay time difference amount becomes It has a ripple of the corresponding amplitude. The signal appearing at the signal output end becomes maximum when the phases of the output signals of the two superheterodyne receiving systems are 90 degrees.

In the monopulse receiver according to the second embodiment of the present invention, the output signals of the two super-heterodyne receiving systems are amplitude-modulated signals, and the signal appearing at the signal output end is of the two super-heterodyne receiving systems. If the signal delay times are equal, it becomes DC, and if the signal delay times of the two super-heterodyne receiving systems are different, there is an amplitude ripple corresponding to the delay time difference amount. The signal appearing at the signal output end becomes maximum when the phases of the output signals of the two superheterodyne receiving systems are 90 degrees.

In the monopulse receiver according to the third embodiment of the present invention, the output signals of the two super-heterodyne receiving systems are frequency-modulated signals, and the signal appearing at the signal output end is of the two super-heterodyne receiving systems. If the signal delay time after the voltage control intermediate frequency attenuator is equal, it becomes DC, and if the signal delay time after the voltage control intermediate frequency attenuator of the two super-heterodyne reception systems is different, it has a ripple of amplitude according to the delay time difference amount. . The signal appearing at the signal output end becomes maximum when the phases of the output signals of the two superheterodyne receiving systems are 90 degrees.

In the monopulse receiver according to the fourth embodiment of the present invention, the output signals of the two super-heterodyne receiving systems are amplitude-modulated signals, and the signal appearing at the signal output end is the signal of the two super-heterodyne receiving systems. If the signal delay time after the low noise amplifier is equal, it becomes DC, and if the signal delay time after the low noise amplifier of the two super-heterodyne receiving systems is different, it has a ripple of amplitude according to the delay time difference amount. The signal appearing at the signal output end becomes maximum when the phases of the output signals of the two superheterodyne receiving systems are 90 degrees.

In the monopulse receiver according to the fifth embodiment of the present invention, the output signals of the two super-heterodyne receiving systems are amplitude-modulated signals, and the signal appearing at the signal output end is of the two super-heterodyne receiving systems. If the signal delay time after the intermediate frequency amplifier is equal, it becomes DC, and if the signal delay time after the intermediate frequency amplifier of the two superheterodyne receiving systems is different, it has a ripple of amplitude according to the delay time difference amount. The signal appearing at the signal output end becomes maximum when the phases of the output signals of the two superheterodyne receiving systems are 90 degrees.

Further, in the monopulse receiver according to the sixth embodiment of the present invention, the output signals of the two super-heterodyne receiving systems are signals modulated according to the broadcast contents of the broadcasting station, and the signals appearing at the signal output terminals are If the signal delay times of the two super-heterodyne receiving systems are equal, it becomes DC, and if the signal delay times of the two super-heterodyne receiving systems are different, there is a ripple with an amplitude corresponding to the delay time difference amount. The signal appearing at the signal output end becomes maximum when the phases of the output signals of the two superheterodyne receiving systems are 90 degrees.

[0018]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, 1a to 12 and 15 to 17
Up to the above, it is the same as that used in the conventional monopulse receiver of this type shown in FIG. Reference numeral 21 is a voltage controlled oscillator, and 22 is a low frequency oscillator.

Next, the operation will be described. The voltage controlled oscillator 21 has a center frequency of the reception signal input terminals 1a and 1
The frequency-modulated signal having the same frequency as the signal input to b, the modulated wave angular frequency being the same as the oscillation angular frequency of the low-frequency oscillator 22, and the constant maximum frequency deviation being constant, is continuously output. The output signals of the voltage controlled oscillator 21 are combined into two superheterodyne receiving systems 10a and 10b by the couplers 2a and 2b.
Are entered at the same time. If an appropriate control voltage is applied to the control signal input terminal 11, the frequency-modulated signal is level-controlled to an appropriate level by the voltage-controlled high frequency attenuators 3a and 3b, amplified by the low noise amplifiers 4a and 4b, and then frequency-controlled. It is input to the mixers 5a and 5b. On the other hand, the output signal of the oscillator 12 is also input to the frequency mixers 5a and 5b. Therefore, the output signals of the mixers 5a and 5b become intermediate frequency frequency modulated waves. The frequency-modulated wave of the intermediate frequency is level-controlled again to an appropriate level by the voltage-controlled intermediate frequency attenuators 6a and 6b, amplified by the intermediate frequency amplifiers 7a and 7b, and band-pass filter 8a,
After the noise is removed by 8b and the signals are delayed by the delay units 9a and 9b in time, the phase is detected by the phase detector 15, the unnecessary signal is removed by the low pass filter, and the signal appears at the signal output terminal 17. At this time, the signals appearing at the signal output terminal 17 are Er, 2
When the signal delay time difference between the superheterodyne receiving systems 10a and 10b of the system is td, Er is given by the following equation.

[0020]

[Equation 1]

That is, if the signal delay times of the two superheterodyne receiving systems 10a and 10b are equal, the signal appearing at the signal output terminal 17 becomes K, that is, DC. In addition, two systems of super-heterodyne receiving systems 10a and 10b
If the signal delay time is different, the frequency of the signal appearing at the signal output terminal 17 is twice the oscillation frequency of the low frequency oscillator 22,
The waveform has a ripple in which the amplitude increases according to the signal delay time difference. The situation in this case is shown in FIG. However, this relationship is limited when the oscillation frequency of the low-frequency oscillator 22 is smaller than 0.5 times the reciprocal of the signal delay time difference between the two superheterodyne receiving systems 10a and 10b. It is possible and problem-free to set so as to satisfy this condition. Therefore, if the signals appearing at the signal output terminal 17 become direct current and the delay devices 9a and 9b are adjusted so that the voltage becomes maximum, two superheterodyne receiving systems 10a and 10b will be used.
The signal delay times of b are equal, and the phase difference between the output signals of the two superheterodyne receiving systems 10a and 10b is 90 degrees. After the above adjustment is completed, the voltage controlled oscillator 21 is stopped and the two reception signal input terminals 1a,
If a signal from the monopulse antenna is input to 1b, the monopulse angle can be measured by the output voltage of the signal output terminal 17.

Example 2. Embodiment 2 of the present invention will be described below with reference to the drawings. In FIG. 3, 1a to 12
Items 15 to 18 are the same as those used in the conventional monopulse receiver of this type shown in FIG. 22 is a low frequency oscillator, and 23 is an amplitude modulator.

Next, the operation will be described. The high frequency oscillator 18 continues to output a signal whose frequency is the same as the signal input to the reception signal input terminals 1a and 1b. The output signal of the high frequency oscillator 18 is amplitude-modulated by the amplitude modulator 23 so that the modulation angular frequency is the same as the oscillation angular frequency of the low-frequency oscillator 23 and the modulation degree is constant. The amplitude-modulated signals are simultaneously input to the two superheterodyne receiving systems 10a and 10b by the couplers 2a and 2b. If an appropriate control voltage is applied to the control signal input terminal 11, the amplitude-modulated signal is level-controlled to an appropriate level by the voltage-controlled high frequency attenuators 3a and 3b, and the low noise amplifiers 4a and 4b.
Is amplified by and input to the frequency mixers 5a and 5b. On the other hand, the output signal of the oscillator 12 is also input to the frequency mixers 5a and 5b. Therefore, the output signals of the mixers 5a and 5b are intermediate frequency amplitude modulation waves. The amplitude-modulated wave of the intermediate frequency is again level-controlled to an appropriate level by the voltage-controlled intermediate frequency attenuators 6a and 6b, amplified by the intermediate frequency amplifiers 7a and 7b, noise is removed by the bandpass filters 8a and 8b, and the delay device 9a,
After being time-delayed at 9b, the phase is detected by the phase detector 15, unnecessary signals are removed by the low-pass filter, and the signal appears at the signal output terminal 17. At this time, the signal that appears at the signal output terminal 17 is Er and the two-system superheterodyne receiving system 10
When the signal delay time difference between a and 10b is td, Er is given by the following equation.

[0024]

[Equation 2]

That is, if the signal delay times of the two superheterodyne receiving systems 10a and 10b are equal, the signal appearing at the signal output terminal 17 becomes K, that is, DC. In addition, two systems of super-heterodyne receiving systems 10a and 10b
If the signal delay time is different, the signal appearing at the signal output terminal 17 has a waveform in which the frequency is the oscillation frequency of the low-frequency oscillator 22 and the amplitude is increased according to the signal delay time difference. The state in this case is shown in FIG. However, this relationship is limited when the oscillation frequency of the low-frequency oscillator 22 is smaller than 0.5 times the reciprocal of the signal delay time difference between the two superheterodyne receiving systems 10a and 10b. It is possible and problem-free to set so as to satisfy this condition. Therefore, if the signal appearing at the signal output terminal 17 is adjusted in the same manner as in the first embodiment and then the high frequency oscillator 18 is stopped and the signals from the monopulse antenna are input to the two received signal input terminals 1a and 1b, the signal output terminal is output. The output voltage of 17 enables monopulse angle measurement.

Example 3. Embodiment 3 of the present invention will be described below with reference to the drawings. In FIG. 5, 1a to 11
Items 15 to 18 are the same as those used in the conventional monopulse receiver of this type shown in FIG. 22 is a low frequency oscillator, and 24 is a voltage controlled oscillator.

Next, the operation will be described. The high frequency oscillator 18 continues to output a signal whose frequency is the same as the signal input to the reception signal input terminals 1a and 1b. The output signal of the high frequency oscillator 18 is input to the two superheterodyne receiving systems 10a and 10b by the couplers 2a and 2b. If an appropriate control voltage is applied to the control signal input terminal 11, the input signal is the voltage controlled high frequency attenuator 3a,
Low noise amplifier 4 whose level is controlled to an appropriate level by 3b
Amplified by a and 4b and input to the frequency mixers 5a and 5b. On the other hand, in the voltage controlled oscillator 23, the center frequency is equal to the difference between the frequencies of the signals input to the reception signal input terminals 1a and 1b and the intermediate frequencies of the two superheterodyne reception systems 10a and 10b, and the modulation wave angular frequency is A frequency-modulated signal having the same oscillation angular frequency as the low-frequency oscillator 22 and a constant maximum frequency deviation is output. This frequency-modulated signal is input to the frequency mixers 5a and 5b. Therefore, the output signals of the mixers 5a and 5b become intermediate frequency frequency modulated waves. After this, a signal appears at the signal output terminal 17 as in the case of the first embodiment. At this time, if the delay time difference between the voltage controlled intermediate frequency attenuators 6a and 6b and the delay devices 9a and 9b of the two superheterodyne receiving systems 10a and 10b is td, the signal appearing at the signal output terminal 17 has the same expression as that of the first embodiment. It is expressed by. Therefore, if the adjustment is performed in the same manner as in the first embodiment, the two systems of the super-teherodyne receiving system 10
The phase difference between the output signals of a and 10b and the delay time difference from the voltage control intermediate frequency attenuators 6a and 6b to the delay devices 9a and 9b can be adjusted. At this time, the signal delay time difference from the couplers 1a and 1b of the two superheterodyne receiving systems 10a and 10b to the frequency mixers 5a and 5b cannot be adjusted,
Most of the signal delay time differences are band pass filters 8a, 8
Since it occurs in b, it can be used practically. After the above adjustment is completed, the high frequency oscillator 18 and the low frequency oscillator 22
And the signal from the monopulse antenna is input to the two reception signal input ends 1a and 1b, the signal output end 17
The monopulse angle can be measured by the output voltage of.

Example 4. Embodiment 4 of the present invention will be described below with reference to the drawings. In FIG. 6, from 1a to 12,
Items 15 to 18 are the same as those used in the conventional monopulse receiver of this type shown in FIG. 22 is a low frequency oscillator, and 25 is a changeover switch.

Next, the operation will be described. The high frequency oscillator 18 continues to output the same signal whose frequency is the same as the signal input to the reception signal input terminals 1a and 1b, and the couplers 2a and 2b.
2 super-heterodyne receiving systems 10a, 1
Input to 0b at the same time. When the low frequency oscillator 22 and the voltage controlled high frequency attenuators 3a and 3b are connected by the changeover switch 25, the output signals of the voltage controlled high frequency attenuators 3a and 3b have a modulation angular frequency equal to the oscillation angular frequency of the low frequency oscillator 22. In the same way, amplitude modulation with a constant degree of modulation can be applied. After that, a signal appears at the signal output terminal 17 by the same operation as in the second embodiment. Here, two systems of super-heterodyne receiving system 10
a, 10b low noise amplifiers 4a, 4b to delay devices 9a,
If the signal delay time difference up to 9b is td, the signal output terminal 1
The signal Er appearing at 7 is expressed by the same formula as in the second embodiment. Therefore, if adjustment is performed in the same manner as in the second embodiment, the phase difference between the output signals of the two super-teherodyne receiving systems 10a and 10b and the low noise amplifiers 4a and 4b to the delay devices 9a and 9b.
The delay time difference up to b can be adjusted. Here, the couplers 1a of the two superheterodyne receiving systems 10a and 10b,
Although the signal delay time difference of 1b cannot be adjusted, most of the signal delay time difference is generated in the band pass filters 8a and 8b, so that it is practically acceptable. After the above adjustment is completed, the control signal input terminal 11 is connected to the voltage controlled high frequency attenuators 3a and 3b by the changeover switch 25, and the high frequency oscillator 18 is connected.
And the signal from the monopulse antenna is input to the two reception signal input ends 1a and 1b, the signal output end 17
The monopulse angle can be measured by the output voltage of.

Example 5. Embodiment 5 of the present invention will be described below with reference to the drawings. In FIG. 7, 1a to 12
Items 15 to 18 are the same as those used in the conventional monopulse receiver of this type shown in FIG. 22 is a low frequency oscillator, and 25 is a changeover switch.

Next, the operation will be described. The high frequency oscillator 18 continues to output the same signal whose frequency is the same as the signal input to the reception signal input terminals 1a and 1b, and the couplers 2a and 2b.
2 super-heterodyne receiving systems 10a, 1
Input to 0b at the same time. When the low frequency oscillator 22 and the voltage controlled intermediate frequency attenuators 6a and 6b are connected by the changeover switch 25, the output signals of the voltage controlled intermediate frequency attenuators 6a and 6b have a modulation angular frequency of the oscillation angle of the low frequency oscillator 22. Amplitude modulation is applied with the same degree of frequency and a constant degree of modulation. After that, a signal appears at the signal output terminal 17 by the same operation as in the second embodiment. Assuming that the signal delay time difference between the intermediate frequency amplifiers 7a and 7b of the two superheterodyne receiving systems 10a and 10b and the delay devices 9a and 9b is td, the signal Er appearing at the signal output terminal 17 has the same formula as in the second embodiment. Expressed. Therefore, if adjustment is performed in the same manner as in the second embodiment, 2
It is possible to adjust the phase difference between the output signals of the super tehrodyne receiving systems 10a and 10b of the system and the delay time difference from the intermediate frequency amplifiers 7a and 7b to the delay devices 9a and 9b. Here, the signal delay time difference from the couplers 2a, 2b of the two superheterodyne receiving systems 10a, 10b to the voltage control intermediate frequency attenuators 6a, 6b cannot be adjusted, but most of the signal delay time differences are the band pass filters 8a, 8b. Since it occurs in, it can be used for practical purposes. After the above adjustment is completed, the control signal input terminal 11 and the voltage controlled intermediate frequency attenuators 6a and 6b are connected by the changeover switch 25, and the high frequency oscillator 1
8 is stopped and the signals from the monopulse antenna are input to the two reception signal input ends 1a and 1b, the signal output end 1
The output voltage of 7 enables monopulse angle measurement.

Example 6. Embodiment 6 of the present invention will be described below with reference to the drawings. In FIG. 8, 1a, 1b and 3a to 12 and 15 to 17 are the same as those used in the conventional monopulse receiver of this type shown in FIG. 26 is an oscillator whose oscillation frequency is equal to the difference between the transmission frequency of the nearest broadcasting station and the intermediate frequency of the superheterodyne receiving systems 10a and 10b, 27 is an oscillator group, and 28 is a switch.

Next, the operation will be described. Broadcast signals of the nearest broadcast station are input to the reception signal input terminals 1a and 1b. The broadcasting signal of the broadcasting station is the same as that in the first embodiment.
a and 5b. On the other hand, the switch 28 inputs the output signal of the oscillator 26 to the local signal input terminals of the frequency mixers 5a and 5b. Thereafter, a signal appears at the signal output terminal 17 by the same operation as that of the first embodiment. Here, the signal delay time difference between the two superheterodyne receiving systems 10a and 10b is td.
Then, the signal Er appearing at the signal output terminal 17 is expressed by the same formula as in the first embodiment when the FM broadcasting station is received, and by the same formula as in the second embodiment when the AM broadcasting station is received. In any case, if adjustment is performed in the same manner as in the first embodiment or the second embodiment, the two systems of the super-teherodyne receiving system 10a, 10
The b signal delay time difference and the output signal phase difference can be adjusted. After completing the above adjustment, the oscillator 1
If the signal from the monopulse antenna is input to the two reception signal input terminals 1a and 1b by contacting 2 with the frequency mixers 5a and 5b, the monopulse angle can be measured by the output voltage of the signal output terminal 17.

[0034]

As described above, according to the first embodiment of the present invention, since the output signals of the voltage controlled oscillator are simultaneously input to the two superheterodyne receiving systems,
There is an effect that a monopulse receiver capable of accurately adjusting the delay time can be obtained even when the adjustment part is only the delay device, the pulse modulator is not necessary, and the narrow band pass filter is used.

Further, according to the second embodiment of the present invention, the output signal of the high frequency oscillator is configured to be simultaneously input to the two superheterodyne receiving systems through the amplitude modulator, so that only the delay unit is adjusted. Further, there is an effect that a pulse modulator becomes unnecessary and a monopulse receiver capable of accurately adjusting a delay time can be obtained even when a narrow band bandpass filter is used.

According to the third embodiment of the present invention, the output signal of the voltage controlled oscillator is input to the local signal input terminal of each frequency mixer in the two superheterodyne receiving systems. There is an effect that a monopulse receiver capable of accurately adjusting the delay time can be obtained even when only a delay device is used, a pulse modulator is not necessary, and a narrow band pass filter is used.

According to the fourth embodiment of the present invention, the output signal of the low-frequency oscillator is connected to each voltage-controlled high-frequency attenuator in the two superheterodyne receiving systems. Further, there is an effect that a pulse modulator becomes unnecessary, and a monopulse receiver capable of accurately adjusting a delay time can be obtained even when a narrow band bandpass filter is used.

According to the fifth embodiment of the present invention, the output signal of the low-frequency oscillator is connected to each voltage-controlled intermediate-frequency attenuator in the two superheterodyne receiving systems. In addition, there is no need for a pulse modulator, and there is an effect that a monopulse receiver capable of accurately adjusting the delay time can be obtained even when a narrow band bandpass filter is used.

According to the sixth embodiment of the present invention, the output signal of the oscillator whose oscillation frequency is equal to the difference between the transmission frequency of the nearest broadcasting station and the intermediate frequency of the two-system super-heterodyne receiving system is used as the above-mentioned two-system super-heterodyne. Since it is configured to input to the local signal input terminal of the frequency mixer in the receiving system, the adjustment point is only the delay device, the pulse modulator is not required, and even when using a narrow band pass filter. There is an effect that a monopulse receiver capable of accurate delay time adjustment can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a monopulse receiver showing a first embodiment of the present invention.

FIG. 2 is a diagram showing an output signal waveform at a signal output end.

FIG. 3 is a configuration diagram of a monopulse receiver showing a second embodiment of the present invention.

FIG. 4 is a diagram showing an output signal waveform at a signal output end.

FIG. 5 is a configuration diagram of a monopulse receiver showing a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a monopulse receiver showing a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a monopulse receiver showing a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of a monopulse receiver showing a sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of a conventional monopulse receiver of this type.

[Explanation of symbols]

 1a Received signal input end 1b Received signal input end 2a Combiner 2b Combiner 3a Voltage controlled high frequency attenuator 3b Voltage controlled high frequency attenuator 4a Low noise amplifier 4b Low noise amplifier 5a Frequency mixer 5b Frequency mixer 6a Voltage controlled intermediate frequency attenuator 6b Voltage controlled intermediate frequency attenuator 7a Intermediate frequency amplifier 7b Intermediate frequency amplifier 8a Band pass filter 8b Band pass filter 9a Delay device 9b Delay device 10a Super heterodyne reception system 10b Super heterodyne reception system 11 Control signal input end 12 Oscillator 13a Output signal monitor end 13b Output signal monitor terminal 14 Phase shifter 15 Phase detector 16 Low pass filter 17 Signal output terminal 18 High frequency oscillator 19 Pulse modulator 20 Pulse generator 21 Voltage controlled oscillator 22 Low frequency oscillator 23 Amplitude modulator 24 Voltage controlled oscillator Vessel 25 changeover switch 26 oscillator 27 Oscillator group 28 switcher

Claims (6)

[Claims] 1. A reception signal input terminal, a coupler connected to the reception signal input terminal, a voltage controlled high frequency attenuator connected to the output terminal of the coupler, and a voltage controlled high frequency attenuator output terminal. A low noise amplifier, a frequency mixer connected to the output of the low noise amplifier, a voltage controlled intermediate frequency attenuator connected to the output of the frequency mixer, and an output of the voltage controlled intermediate frequency attenuator A first circuit having an intermediate frequency amplifier, a bandpass filter connected to an output terminal of the intermediate frequency amplifier, and a delay device connected to an output terminal of the bandpass filter.
Superheterodyne receiving system, a second superheterodyne receiving system having the same structure as the first superheterodyne receiving system, and a single signal input terminal of each mixer in the two superheterodyne receiving systems. An oscillator, one voltage-controlled oscillator connected to a coupling signal input terminal of each coupler in the two superheterodyne receiving systems, and a low-frequency oscillator connected to a control voltage input terminal of the voltage-controlled oscillator, One phase detector connected to the output terminal of each delay device in the two super-heterodyne receiving systems, a low-pass filter connected to the output terminal of the phase detector, and an output terminal of the low-pass filter And a signal output terminal connected to the control voltage input terminal of each of the voltage control high frequency attenuators in the two super-heterodyne receiving systems Monopulse receiver having a control signal input coupled to a control voltage input terminal of the frequency attenuator. 2. A received signal input terminal, a coupler connected to the received signal input terminal, a voltage controlled high frequency attenuator connected to the output terminal of the coupler, and an output terminal of the voltage controlled high frequency attenuator. A low noise amplifier, a frequency mixer connected to the output of the low noise amplifier, a voltage controlled intermediate frequency attenuator connected to the output of the frequency mixer, and an output of the voltage controlled intermediate frequency attenuator A first circuit having an intermediate frequency amplifier, a bandpass filter connected to an output terminal of the intermediate frequency amplifier, and a delay device connected to an output terminal of the bandpass filter.
Superheterodyne receiving system, a second superheterodyne receiving system having the same structure as the first superheterodyne receiving system, and a single signal input terminal of each mixer in the two superheterodyne receiving systems. An oscillator, one amplitude modulator connected to a combined signal input end of each coupler in the two superheterodyne receiving systems, a high frequency oscillator connected to a carrier input end of the amplitude modulator, and an amplitude modulator A low frequency oscillator connected to the control voltage input terminal, a phase detector connected to the output terminal of each delay device in the two superheterodyne receiving systems, and a phase detector connected to the output terminal of the phase detector. Low-pass filter, a signal output end connected to the output end of the low-pass filter, and each voltage-controlled high-frequency wave in the two super-heterodyne reception systems Monopulse receiver having a control signal input coupled to a control voltage input terminal of the control voltage input terminal and each of the voltage controlled intermediate frequency attenuator 衰器. 3. A received signal input terminal, a combiner connected to the received signal input terminal, a voltage controlled high frequency attenuator connected to the output terminal of the coupler, and an output terminal of the voltage controlled high frequency attenuator. A low noise amplifier, a frequency mixer connected to the output of the low noise amplifier, a voltage controlled intermediate frequency attenuator connected to the output of the frequency mixer, and an output of the voltage controlled intermediate frequency attenuator A first circuit having an intermediate frequency amplifier, a bandpass filter connected to an output terminal of the intermediate frequency amplifier, and a delay device connected to an output terminal of the bandpass filter.
Superheterodyne receiving system, a second superheterodyne receiving system having the same structure as the first superheterodyne receiving system, and a single signal input terminal of each mixer in the two superheterodyne receiving systems. A voltage controlled oscillator, a low frequency oscillator connected to a control voltage input terminal of the voltage controlled oscillator, and a high frequency oscillator connected to a combined signal input terminal of each coupler in the two superheterodyne receiving systems, 1 connected to the output terminal of each delay device in the two super-heterodyne receiving systems
Two phase detectors, a low pass filter connected to the output end of the phase detector, a signal output end connected to the output end of the low pass filter, and the respective voltages in the two superheterodyne receiving systems A monopulse receiver having a control voltage input of the controlled high frequency attenuator and a control signal input connected to the control voltage input of each voltage controlled intermediate frequency attenuator. 4. A received signal input terminal, a coupler connected to the received signal input terminal, a voltage controlled high frequency attenuator connected to the output terminal of the coupler, and an output terminal of the voltage controlled high frequency attenuator. A low noise amplifier, a frequency mixer connected to the output of the low noise amplifier, a voltage controlled intermediate frequency attenuator connected to the output of the frequency mixer, and an output of the voltage controlled intermediate frequency attenuator A first circuit having an intermediate frequency amplifier, a bandpass filter connected to an output terminal of the intermediate frequency amplifier, and a delay device connected to an output terminal of the bandpass filter.
Superheterodyne receiving system, a second superheterodyne receiving system having the same structure as the first superheterodyne receiving system, and a single signal input terminal of each mixer in the two superheterodyne receiving systems. An oscillator, one high frequency oscillator connected to the combined signal input terminal of each coupler in the two super-heterodyne receiving systems, and an output terminal of each delay device in the two super-heterodyne receiving systems. One phase detector, a low pass filter connected to the output end of the phase detector, a signal output end connected to the output end of the low pass filter, and each of the two superheterodyne receiving systems. Connected to the control voltage input terminal of the voltage controlled high frequency attenuator
One changeover switch, a low frequency oscillator connected to one input contact of this changeover switch, the other input contact of this changeover switch and each of the voltage controlled intermediate frequency attenuators in the two superheterodyne receiving systems. A monopulse receiver having a control voltage input and a control signal input connected to the control voltage input. 5. A reception signal input terminal, a coupler connected to the reception signal input terminal, a voltage controlled high frequency attenuator connected to the output terminal of the coupler, and a voltage controlled high frequency attenuator output terminal. A low noise amplifier, a frequency mixer connected to the output of the low noise amplifier, a voltage controlled intermediate frequency attenuator connected to the output of the frequency mixer, and an output of the voltage controlled intermediate frequency attenuator A first circuit having an intermediate frequency amplifier, a bandpass filter connected to an output terminal of the intermediate frequency amplifier, and a delay device connected to an output terminal of the bandpass filter.
Superheterodyne receiving system, a second superheterodyne receiving system having the same structure as the first superheterodyne receiving system, and a single signal input terminal of each mixer in the two superheterodyne receiving systems. An oscillator, one high frequency oscillator connected to the combined signal input terminal of each coupler in the two super-heterodyne receiving systems, and an output terminal of each delay device in the two super-heterodyne receiving systems. One phase detector, a low pass filter connected to the output end of the phase detector, a signal output end connected to the output end of the low pass filter, and each of the two superheterodyne receiving systems. One change-over switch connected to the control voltage input terminal of the voltage-controlled intermediate frequency attenuator, and a low-changer connected to one input contact of this change-over switch. Receiver having a wave oscillator and a control signal input terminal connected to the other input contact of the changeover switch and the control voltage input terminal of each voltage controlled high frequency attenuator in the two superheterodyne receiving systems . 6. A received signal input terminal, a voltage controlled high frequency attenuator connected to the received signal input terminal, a low noise amplifier connected to an output terminal of the voltage controlled high frequency attenuator, and an output terminal of the low noise amplifier. Connected to the frequency mixer to be connected, the voltage control intermediate frequency attenuator connected to the output terminal of the frequency mixer, the intermediate frequency amplifier connected to the output terminal of the voltage control intermediate frequency attenuator, and the output terminal of the intermediate frequency amplifier First super-heterodyne receiving system having a band-pass filter that is provided and a delay device that is connected to the output end of the band-pass filter;
A second super-heterodyne receiving system having the same structure as the super-heterodyne receiving system, and 1 connected to the output terminals of the respective delay devices in the two super-heterodyne receiving systems.
Two phase detectors, a low pass filter connected to the output end of the phase detector, a signal output end connected to the output end of the low pass filter, and the respective voltages in the two superheterodyne receiving systems A control signal input terminal connected to the control voltage input terminal of the control high frequency attenuator and the control voltage input terminal of each voltage controlled intermediate frequency attenuator, the transmission frequency of the broadcasting station whose oscillation frequency is the nearest, and the superheterodyne receiving system described above. And an oscillator group including oscillators equal to the difference between the intermediate frequencies of the two, and one of the output signals of the plurality of oscillators of the oscillator group is selected to be connected to the local signal input terminal of each mixer in the two superheterodyne receiving systems. A monopulse receiver having one switch connected.