JPH09257921A - Mono pulse radar tranceiver device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a computer to display the frequency characteristic of a receiver by gnerating a quasi signal through change of a Doppler frequency, storing the calculation power in RAM, and taking it out by a computer if required. SOLUTION: When a measurement switch 24 is put on, mesurement start trigger is input to a measurement system controller 25. With a specified quasi- signal generation function, an output signal of a switch 26 is output to a power calculator 30. A switch 28 selects a ΣQ video signal is selected according to a switch signal of a controller 25, and the calculator 30 digitally calculates Σreception power, then the result is stored in RAM 31. With the controller 25 reception power is calculated similarly and the result is stored in RAM 31. Then, the controller 25 changes the doppler frequency only for a specified frequency interval and it is set in this way into a transceiver controller 9, and after a quasi-signal is generated, both Σ and Δ reception power is calculated similarly and the result is stored in RAM 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transceiver of a monopulse radar device used for detecting a target of a ship, an aircraft or the like or tracking the target.

[0002]

2. Description of the Related Art FIG. 7 shows a measuring system for measuring a receiver frequency characteristic of a conventional monopulse radar transceiver. 1 is a monopulse transceiver, 2 is a standard signal generator, and 3 is a standard signal generator.
Is a spectrum analyzer.

In FIG. 7, to measure the receiver frequency characteristic of the monopulse transceiver 1, the standard signal generator 2 is received at the reception signal input end of the monopulse transceiver 1, and the spectrum analyzer 3 is received by the monopulse transceiver 1. Connect to the signal output terminal. The standard signal generator 2 is manually set to sweep the output signal frequency through the frequency band of the receiver and generate a standard signal. The standard signal input from the reception signal input end is amplified by the reception gain of the monopulse transceiver and output from the reception signal output end. The standard signal output from the reception signal output terminal is input to the spectrum analyzer 3 and is displayed after the power is detected inside.
Since the standard signal is set to sweep the receiver band, the frequency characteristic of the receiver can be obtained by outputting the display of the spectrum analyzer 3.

FIG. 8 shows a measurement system for measuring the matching characteristics between receiver channels of a conventional monopulse radar transceiver, wherein 1 is a monopulse transceiver and 4 is a network analyzer.

In FIG. 8, in order to measure the matching characteristics between the receiver channels of the monopulse transmitter / receiver 1, the standard signal output from the network analyzer 4 is divided into two, and the Σ reception signal input end of the monopulse transmitter / receiver 1 and Δ reception. The signal input terminal and the two measurement signal input terminals of the network analyzer 4 are connected to the Σ received signal output terminal and the Δ received signal output terminal of the monopulse transceiver 1, respectively. The network analyzer 4 is manually set to generate a standard signal. The standard signals input from the Σ reception signal input end and the Δ reception signal input end are amplified by the reception gain of the monopulse transceiver 1 and output from the Σ reception signal output end and the Δ reception signal output end, respectively. The standard signals output from the two reception signal output terminals are input to the network analyzer 4 and the amplitude ratio and the phase difference are detected and then displayed. After reading the displayed amplitude ratio and phase difference, the receiver gain of the receiver is changed and the amplitude ratio and phase difference are measured in the same manner as described above. By measuring and illustrating the above operation for all receiver gains, the matching characteristics between receiver channels can be obtained.

FIG. 9 shows the structure of a conventional monopulse radar transceiver. 5 is a coherent oscillator, 6 is a transmission frequency converter, 7 is a local oscillator, 8 is a changeover switch, and 9 is a switch.
Is a transceiver controller, 10 is a modulator, 11 is a pseudo signal generator, 12 is a transmission power amplifier (hereinafter abbreviated as RF amplifier),
13 is a transmission / reception switcher, 14 is a Σ-directional coupler, 15 is a Δ-directional coupler, 16 is a Σ reception frequency converter, 17 is a Σ intermediate frequency power amplifier (hereinafter abbreviated as ΣIF amplifier), and 18 is a Σ variable attenuation. , 19 is a Σ phase detector, 20 is a Δ reception frequency converter, 21 is a Δ intermediate frequency power amplifier (hereinafter referred to as ΔIF
22 is a Δ variable attenuator, and 23 is a Δ phase detector.

In FIG. 9, the phase reference signal generated by the coherent oscillator 5 is input to the transmission frequency converter 6, frequency-added (up-converted) with the local oscillation signal generated by the local oscillator 7, and input to the changeover switch 8. To be done. The changeover switch 8 sends a signal input from the transceiver controller 9 at the transmission / reception switching timing to the modulator 10 at the transmission timing, and the pseudo signal generator 11 at the reception timing.
Switch to. The transmission signal switched by the changeover switch 8 is input to the modulator 10 and pulse-modulated and then R
It is input to the F amplifier 12. The RF amplifier 12 amplifies the power of the input transmission signal by a constant gain, and transmits / receives the switch 13
To send to.

The transmission / reception switch 13 sends the signal from the RF amplifier 12 to the antenna device connected outside the transceiver,
Further, the Σ received signal input from the antenna device is switched to the Σ directional coupler 14 and transmitted. On the other hand, the transmission signal switched by the changeover switch 8 and input to the pseudo signal generator 11 is level-controlled by the pseudo signal level control signal from the transceiver controller 9 and then pulse-modulated by the pseudo signal timing signal. Are input to the Σ-directional coupler 14 and the Δ-directional coupler 15. The Σ reception signal switched by the transmission / reception switch 13 is input to the Σ directional coupler 14 and mixed with the pseudo signal generated by the pseudo signal generator 11 to be output. The output of the Σ directional coupler 14 is input to the Σ reception frequency converter 16, is frequency-reduced (down-converted) with the local oscillation signal generated by the local oscillator 7, and is input to the ΣIF amplifier 17. The ΣIF amplifier 17 outputs power to the Σ variable attenuator 18 after power-amplifying the input reception signal by a constant gain. The Σ variable attenuator 18 changes the amount of attenuation by the gain control signal from the transceiver controller 9
Controls the gain of the receiver.

The output of the Σ variable attenuator 18 is input to the Σ phase detector 19 and phase-detected using the phase reference signal generated by the coherent oscillator 5 to obtain a ΣI video signal and a ΣI video signal.
It is converted into a Q video signal. Further, the Δ reception signal input from the antenna device connected to the outside of the transceiver is input to the Δ directional coupler 15 and mixed with the pseudo signal generated by the pseudo signal generator 11 to be output. The output of the Δ directional coupler 15 is input to the Δ reception frequency converter 20,
The frequency is subtracted (down-converted) from the local oscillation signal generated by the local oscillator 7 and input to the ΔIF amplifier 21. The ΔIF amplifier 21 outputs the received signal to the Δ variable attenuator 22 after power-amplifying the received signal by a constant gain. The Δ variable attenuator 22 controls the gain of the Δ receiver by changing the amount of attenuation according to the gain control signal from the transceiver controller 9. The output of the Δ variable attenuator 22 is input to the Δ phase detector 23,
Phase detection is performed using the phase reference signal generated by the coherent oscillator 1 and converted into a ΔI video signal and a ΔQ video signal.

[0010]

By the way, in the conventional monopulse transmitter / receiver configured and operating as described above, in order to measure the receiver frequency characteristic and the receiver channel matching characteristic, a standard connected externally is used. A signal generator, spectrum analyzer and network analyzer were needed. Moreover, after the transceiver is set up as a radar device, it is often difficult in terms of dimensions or weight to install the measuring device near the transceiver for characteristic measurement. There is a problem that the receiver channel matching characteristic may not be measured.

The present invention has been made to solve the above problems, and a power detector for detecting a signal power at a reception signal output end and a phase detector for detecting a signal phase are provided in a monopulse transceiver. By using the pseudo signal generating function in the transceiver, the receiver frequency characteristic, the receiver channel amplitude matching and the receiver channel phase matching are measured, and the measured value is provided in the RA.
The information is stored in M and can be taken out and displayed by a computer connected to the outside as needed.

[0012]

According to a first aspect of the present invention, there is provided a monopulse transmitter / receiver, wherein a voltage of a signal output from a reception signal output terminal, that is, a ΣI video output terminal, a ΣQ video output terminal, a ΔI video output terminal and a ΔQ video output terminal. A / D converter for converting the value into a digital signal, a power calculator for calculating Σ received power and Δ received power from the voltage value detected by the A / D converter, and a power calculator It is equipped with a RAM that temporarily stores the power value, an external interface that interfaces the data in the RAM with a computer that is connected to the outside of the transceiver, and a measurement system controller that controls the Doppler frequency of the pseudo signal. The set measurement start trigger changes the Doppler frequency at regular intervals over the entire frequency band of the receiver to generate a pseudo signal and change the frequency. Σ received power and Δ received power are calculated and saved in RAM for each, and if necessary, a computer connected to the outside of the transceiver can retrieve the data in RAM and display the receiver frequency characteristics on the computer. It is something to try.

The monopulse transmitter / receiver according to the second aspect of the present invention includes a reception signal output end, that is, a ΣI video output end and a ΣQ output end.
A / D converter for converting the voltage value of the signal output from the video output terminal, the ΔI video output terminal and the ΔQ video output terminal into a digital signal, and the Σ received power from the voltage value detected by the A / D converter. And a power calculator that calculates Δ received power,
A subtractor for calculating the difference between the Σ received power and the Δ received power, a RAM for temporarily storing the power difference between Σ and Δ calculated by the subtractor, and a computer for connecting the data in the RAM to the outside of the transceiver. Equipped with an external interface device for interfacing with and a level controller for controlling the generation level of the pseudo signal, the gain control amount of the receiver is changed over the entire variable range by the measurement start trigger arbitrarily set from the outside, and A pseudo signal is generated while the reception signal level is kept constant by adjusting the generation level of the pseudo signal by the level controller so as to cancel the change amount of the reception gain, and the Σ reception power and Δ Calculate the difference in received power, save it in RAM, and take out the data in RAM by a computer connected to the outside of the transceiver if necessary. It is intended to obtain the ability to view the amplitude matching characteristics between the receiver channels.

The monopulse transmitter / receiver according to the third aspect of the present invention includes a reception signal output end, that is, a ΣI video output end and a ΣQ output end.
An A / D converter that converts the voltage value of the signal output from the video output terminal, the ΔI video output terminal, and the ΔQ video output terminal into a digital signal, and a Σ reception phase based on the voltage value detected by the A / D converter. And a phase calculator for calculating the Δ reception phase,
A subtracter that calculates the difference between the Σ reception phase and the Δ reception phase, a RAM that temporarily stores the phase difference between Σ and Δ calculated by the subtractor, and a computer that connects the data in the RAM to the outside of the transceiver. Equipped with an external interface device for interfacing with and a level controller for controlling the generation level of the pseudo signal, the gain control amount of the receiver is changed over the entire variable range by the measurement start trigger arbitrarily set from the outside, and A pseudo signal is generated while the reception signal level is kept constant by adjusting the generation level of the pseudo signal by the level controller so as to cancel out the change amount of the reception gain, and the Σ reception phase is set for each change in the gain control amount. Δ Calculate the difference in reception phase and save it in RAM, and if necessary, take out the data in RAM by a computer connected to the outside of the transmitter / receiver. It is intended to obtain the ability to show the phase matching characteristics between the receiver channels.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. 1 is a configuration diagram showing a first embodiment of the present invention. In FIG. 1, 5 to 23 are the same as those in the conventional art, 24 is a measurement start switch, 25 is a measurement system controller, and 26 is an I switch. Switch, 27 is IA / D converter,
28 is a q switch, 29 is a QA / D converter, 30 is a power calculator, 31 is a RAM (random access memory), and 32 is an external interface device.

In the structure shown in FIG. 1, the measurement system controller 25 can be operated by arbitrarily turning on the measurement starting switch 24.
A measurement start trigger is input to. When the measurement activation trigger is input, the measurement system controller 25 outputs the Doppler frequency value of the pseudo signal and the pseudo signal generation timing to the transceiver controller 9. The transmitter / receiver controller 9 generates a pseudo signal of the Doppler frequency and generation timing from the pseudo signal generator 11 according to the signal from the measurement system controller 25, and receives Σ from the Σ directional coupler 14 and the Δ directional coupler 15. Inject into the system and Δ receiving system. The pseudo signal is sent to a ΣI detector by a Σ phase detector 19.
The video and the ΣQ video are converted into the ΔI video and the ΔQ video by the Δ phase detector 23. The I changeover switch 26 selects the ΣI video signal from the ΣI video signal and the ΔI video signal according to the changeover signal from the measurement system controller 25 to select IA / D.
Output to the converter 27. The IA / D converter 27 converts the output signal of the I changeover switch 26 into a digital signal corresponding to the voltage value of the ΣI video signal and outputs it to the power calculator 30.

On the other hand, the Q changeover switch 28 selects the ΣQ video signal from the ΣQ video signal and the ΔQ video signal in accordance with the changeover signal from the measurement system controller 25 and outputs it to the QA / D converter 29. QA / D reaction converter 29 is Q changeover switch 2
The output signal of 8 is converted into a digital signal corresponding to the voltage value of the ΣQ video signal and output to the power calculator 30. The power calculator 30 digitally calculates the Σ received power from the ΣI video signal voltage value and the ΣQ video signal voltage value according to the calculation formula given by “Equation 1”, and stores the result in the designated address of the RAM 31. As soon as the Σ received power value is stored in the RAM 31, the measurement system controller 25 causes the I selector switch 26 to
And Q changeover switch 27, ΔI video signal and ΔQ
Output a signal to select a video signal.

In the same manner as the Σ received power, the Δ received power is calculated by the selection signal and stored in the RAM 31.
As described above, when the Σ received power and the Δ received power are stored in the RAM 31 for a certain Doppler frequency, the measurement system controller 25 changes the Doppler frequency by a constant frequency interval and causes the transceiver controller 9 to change the Doppler frequency. Set. After setting the Doppler frequency and generating a pseudo signal, the Σ received power and the Δ received power are calculated and stored in the RAM 31 in the same manner as described above. The measurement system controller 25 changes the Doppler frequency at constant frequency intervals over the entire frequency band of the receiver, stores the Σ received power and the Δ received power in the RAM 31 each time the change is made, and ends the measurement. The Σ received power and Δ received power for the entire received band, that is, the receiver frequency characteristic data of Σ channel and Δ channel, stored in the RAM 31,
It is read out via the external interface unit 32 by a computer arbitrarily connected to the outside of the transceiver.
The read-out receiver frequency characteristic data is subjected to data processing and displayed as a graph as shown in FIG. 2, for example.

Embodiment 2. FIG. 3 is a configuration diagram showing a second embodiment of the present invention. In FIG. 3, 5 to 23 are the same as those of the conventional art, 24 is a measurement start switch, and 2 is a measurement start switch.
5 is a measurement system controller, 26 is an I changeover switch, 27 is an IA
/ D converter, 28 Q changeover switch, 29 QA / D converter, 31 RAM, 32 external interface device, 3
3 is an IA / D conversion output changeover switch, 34 is a Σ power calculator, 35 is a QA / D conversion output changeover switch, 36 is a Δ power calculator, and 37 is a subtractor.

In the configuration as shown in FIG. 3, the measurement start switch 24 is arbitrarily turned on so that the measurement system controller 25
A measurement start trigger is input to. When the measurement start trigger is input, the measurement system controller 25 sets the attenuation amount of the Σ variable attenuator 18, the attenuation amount of the Δ variable attenuator 22, the pseudo signal generation level control amount, and the pseudo signal generation timing to the transceiver controller. Output to 9. The transmitter / receiver controller 9 generates a pseudo signal of the level and the generation timing from the pseudo signal generator 11 according to the signal from the measurement system controller 25, and the Σ directional coupler 14
And the Δ direction coupler 15 are injected into the Σ reception system and the Δ reception system, and the attenuation amounts are set in the Σ variable attenuator 18 and the Δ variable attenuator 22.

The pseudo signal is Σ-phased by the Σ-phase detector 19.
The I video and the ΣQ video are converted into the ΔI video and the ΔQ video by the Δ phase detector 23. The I selector switch 26 selects the ΣI video signal from the ΣI video signal and the ΔI video signal in response to the switching signal from the measurement system controller 25 to select IA /
Output to the D converter 27. The IA / D converter 27 converts the output signal of the I changeover switch 26 into a digital signal corresponding to the voltage value of the ΣI video signal and outputs it to the IA / D conversion output changeover switch 33.
3 outputs the digital signal to the Σ electric power calculator 34 in response to a switching signal from the measurement system controller 25. On the other hand, the Q changeover switch 28 selects the ΣQ video signal from the ΣQ video signal and the ΔQ video signal by the switching signal from the measurement system controller 25 and outputs it to the QA / D converter 29. The QA / D converter 29 converts the output signal of the Q switch 28 into a digital signal corresponding to the voltage value of the ΣQ video signal and outputs it to the QA / D conversion switch 35, and the QA / D conversion output switch 35 measures. Σ by the switching signal from the system controller 25
The digital signal is output to the power calculator 34. The Σ power calculator 34 digitally calculates the Σ received power from the Σ I video signal voltage value and the Σ Q video signal voltage value according to the calculation formula given by “Equation 1”, and the measurement system controller 25 inputs the result as a trigger signal. Hold until temporarily.

[0022]

[Equation 1]

As soon as the Σ received power is held in the Σ power calculator 34, the measurement system controller 25 causes the I changeover switch 26 and Q
A switching signal is output to the selector switch 28 so as to select the ΔI video signal and the ΔQ video signal, and the ID
A switching signal is output to the / A conversion output selector switch 33 and the QD / A conversion output selector switch 34 so as to switch the output to the Δpower calculator 36. Similar to the Σ received power, the ∆ received power is calculated by the Δ power calculator 36 by the switching signal, and is temporarily held until the trigger signal is input from the measurement system controller 25.

As soon as the Δ received power is held in the Δ received power calculator 36, the measurement system controller 25 sends a trigger signal to the Σ electric power calculator 34 and the Δ electric power calculator 36 to obtain the Σ received power and the Δ received electric power. Electric power is simultaneously output to the subtractor 37. The subtractor 37 calculates the ΣΔ power difference from the Σ received power and the Δ received power according to the calculation formula given by “Equation 2”, and the result is stored in the RAM 3
Save to the specified address of 1. The ΣΔ power difference stored in the RAM 31 as described above corresponds to the amplitude matching between the Σ channel and the Δ channel for a certain receiver gain. When the amplitude matching is stored in the RAM 31, the measurement system controller 25 attenuates the attenuation amount of the Σ variable attenuator 18 and the attenuation amount of the Δ variable attenuator 22, that is, the receiver gain by a certain value, and the transceiver controller 9 Set to.

[0025]

[Equation 2]

However, when the receiver gain is attenuated, the signal voltage at the receiver output decreases, and the IA / D converter 27
Since the QA / D converter 29 becomes less than the minimum voltage that can be converted and the digital conversion cannot be performed, the measurement system controller 25
Sends a level control signal to the pseudo signal generator 11 so as to increase the pseudo signal level by the attenuation amount of the receiver gain. The output of the receiver is kept constant even if the receiver gain is changed by controlling the pseudo signal level. After setting the receiver gain, the amplitude matching value is calculated and stored in the RAM 31 in the same manner as described above. The measurement system controller 25 changes the receiver gain over the entire variable range of the receiver, calculates the amplitude matching, stores the result in the RAM 31, and ends the measurement. The ΣΔ inter-channel amplitude matching data for all receiver gains stored in the RAM 31 is read out via the external interface unit 32 by a computer arbitrarily connected to the outside of the transceiver. The read ΣΔ channel-to-channel amplitude matching data is subjected to data processing and displayed as a graph as shown in FIG. 4, for example.

Embodiment 3 FIG. 5 is a configuration diagram showing a third embodiment of the present invention. In FIG. 5, 5 to 23 are the same as those in the conventional art, 24 is a measurement start switch, and 2 is a measurement start switch.
5 is a measurement system controller, 26 is an I changeover switch, 27 is an IA
/ D converter, 28 Q changeover switch, 29 QA / D converter, 31 RAM, 32 external interface device, 3
3 is an IA / D conversion output changeover switch, 35 is a QA / D conversion output changeover switch, 37 is a subtractor, 38 is a Σ phase calculator, and 39 is a Δ phase calculator.

In the configuration shown in FIG. 5, the measurement system controller 25 can be operated by arbitrarily turning on the measurement starting switch 24.
A measurement start trigger is input to. When the measurement start trigger is input, the measurement system controller 25 sets the attenuation amount of the Σ variable attenuator 18, the attenuation amount of the Δ variable attenuator 22, the pseudo signal generation level control amount, and the pseudo signal generation timing to the transceiver controller. Output to 9. The transmitter / receiver controller 9 generates a pseudo signal of the level and the generation timing from the pseudo signal generator 11 according to the signal from the measurement system controller 25, and the Σ directional coupler 14
And the Δ direction coupler 15 are injected into the Σ reception system and the Δ reception system, and the attenuation amounts are set in the Σ variable attenuator 18 and the Δ variable attenuator 22.

The pseudo signal is processed by the Σ phase detector 19 by Σ
The I video and the ΣQ video are converted into the ΔI video and the ΔQ video by the Δ phase detector 23. The I selector switch 26 selects the ΣI video signal from the ΣI video signal and the ΔI video signal in response to the switching signal from the measurement system controller 25 to select IA /
Output to the D converter 27. The IA / D converter 27 converts the output signal of the I changeover switch 26 into a digital signal corresponding to the voltage value of the ΣI video signal and outputs it to the IA / D conversion output changeover switch 33.
3 outputs the digital signal to the Σ phase calculator 38 in response to a switching signal from the measurement system controller 25.

On the other hand, the Q changeover switch 28 selects the ΣQ video signal from the ΣQ video signal and the ΔQ video signal in response to the changeover signal from the measurement system controller 25 and outputs it to the QA / D converter 29. The QA / D converter 29 converts the output signal of the Q changeover switch 28 into a digital signal corresponding to the voltage value of the ΣQ video signal and outputs it to the QA / D conversion output changeover switch 35. The digital signal is output to the Σ phase calculator 38 by the switching signal from the measurement system controller 25. The Σ phase calculator 38 digitally calculates the Σ reception phase from the ΣI video signal voltage value and the ΣQ video signal voltage value according to the calculation formula given by “Equation 3”,
The result is temporarily held until the trigger signal is input from the measurement system controller 25.

[0031]

(Equation 3)

As soon as the Σ received phase is held in the Σ phase calculator 34, the measurement system controller 25 causes the I selector switch 26 and Q
A switching signal is output to the selector switch 28 so as to select the ΔI video signal and the ΔQ video signal, and the ID
A switching signal is output to the / A conversion output selector switch 33 and the QD / A conversion output selector switch 34 so as to switch the output to the Δ phase calculator 39. Similar to the Σ reception phase, the Δ phase calculator 39 calculates the Δ reception phase by the switching signal, and the Δ phase is temporarily held until the trigger signal is input from the measurement system controller 25. As soon as the Δ reception phase is held in the Δ reception phase calculator 36, the measurement system controller 25 sends a trigger signal to the Σ phase calculator 38 and the Δ phase calculator 39 so that the Σ reception phase and the Δ reception phase simultaneously. It is output to the subtractor 37. The subtractor 37 calculates the ΣΔ phase difference from the Σ reception phase and the Δ reception phase according to the calculation formula given by “Equation 4”, and stores the result in the designated address of the RAM 31.

[0033]

(Equation 4)

The ΣΔ phase difference stored in the RAM 31 corresponds to the phase matching between the Σ channel and the Δ channel for a certain receiver gain. The phase matching is RAM
When stored in 31, the measurement system controller 25 attenuates the attenuation amount of the Σ variable attenuator 18 and the attenuation amount of the Δ variable attenuator 22, that is, attenuates the receiver gain by a constant value and sets it in the transceiver controller 9. To do.

However, when the receiver gain is attenuated, the signal voltage at the receiver output drops, and the IA / D converter 27
Since the QA / D converter 29 becomes less than the minimum voltage that can be converted and the digital conversion cannot be performed, the measurement system controller 25
Sends a level control signal to the pseudo signal generator 11 so as to increase the pseudo signal level by the attenuation amount of the receiver gain. The output of the receiver is kept constant even if the receiver gain is changed by controlling the pseudo signal level. After setting the receiver gain, the phase matching value is calculated and stored in the RAM 31 in the same manner as described above. The measurement system controller 25 calculates the phase matching by changing the receiver gain over the entire variable range of the receiver, stores the result in the RAM 31, and ends the measurement. The ΣΔ inter-channel phase matching data for all receiver gains stored in the RAM 31 is read out via the external interface unit 32 by a computer arbitrarily connected to the outside of the transceiver. The read out ΣΔ inter-channel phase matching data is subjected to data processing and displayed as a graph as shown in FIG. 6, for example.

[0036]

According to the first aspect of the invention, the voltage value of the signal output from the reception signal output terminal, that is, the ΣI video output terminal, the ΣQ video output terminal, the ΔI video output terminal and the ΔQ video output terminal is converted into a digital signal. And an A / D converter for
A power calculator for calculating Σ received power and Δ received power from the voltage value detected by the D / D converter, a RAM for temporarily storing the power value calculated by the power calculator, and a transceiver for data in the RAM It is equipped with an external interface device that interfaces with a computer connected to the outside of the computer, and a measurement system controller that controls the Doppler frequency of the pseudo signal, and the Doppler frequency is received at regular intervals by a measurement start trigger that is arbitrarily set from the outside. The pseudo signal is generated by changing over the entire frequency band of R, the Σ received power and the Δ received power are calculated every time the frequency is changed, and stored in the RAM.
It is possible to obtain the function of extracting the data in the AM and displaying the receiver frequency characteristic on the computer.

According to the second aspect of the invention, the reception signal output end, that is, the ΣI video output end, the ΣQ video output end, and the ΔI
A / D converter that converts the voltage value of the signal output from the video output terminal and the ΔQ video output terminal into a digital signal, and the Σ received power and Δ from the voltage value detected by the A / D converter.
A power calculator for calculating the received power, a subtractor for calculating the difference between the Σ received power and the Δ received power, a RAM for temporarily storing the power difference between Σ and Δ calculated by the subtractor, and data in the RAM It is equipped with an external interface that interfaces the computer to the outside of the transceiver, and a level controller that controls the pseudo signal generation level.The gain control amount of the receiver can be set by a measurement start trigger that is set externally. Is varied over the entire variable range, and the level controller adjusts the generation level of the pseudo signal so as to cancel the variation of the reception gain, thereby generating the pseudo signal while keeping the reception signal level constant. The difference between the Σ received power and the Δ received power is calculated for each change in the control amount and saved in the RAM. If necessary, the computer connected to the outside of the transceiver stores the RAM Retrieves the data, there is an effect that it is possible to obtain the ability to display the amplitude matching characteristics between the receiver channels to the computer.

According to the third aspect of the invention, the reception signal output end, that is, the ΣI video output end, the ΣQ video output end, and the ΔI
A / D converter for converting the voltage value of the signal output from the video output terminal and the ΔQ video output terminal into a digital signal, and the Σ reception phase and Δ from the voltage value detected by the A / D converter.
A phase calculator for calculating the reception phase, a subtractor for calculating the difference between the Σ reception phase and the Δ reception phase, a RAM for temporarily storing the phase difference between Σ and Δ calculated by the subtractor, and data in the RAM It is equipped with an external interface that interfaces the computer to the outside of the transceiver, and a level controller that controls the pseudo signal generation level.The gain control amount of the receiver can be set by a measurement start trigger that is set externally. Is varied over the entire variable range, and the level controller adjusts the generation level of the pseudo signal so as to cancel the variation of the reception gain, thereby generating the pseudo signal while keeping the reception signal level constant. The difference between the Σ reception phase and the Δ reception phase is calculated for each change in the control amount and saved in the RAM. If necessary, the computer connected to the outside of the transmitter / receiver will use the RAM Retrieves the data, there is an effect that it is possible to obtain the ability to display the phase matching characteristics between the receiver channels to the computer.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a monopulse radar transceiver according to the present invention.

FIG. 2 is a diagram showing an example of a computer display of a receiver frequency characteristic read from the monopulse radar transceiver according to the first embodiment.

FIG. 3 is a diagram showing a second embodiment of a monopulse level transceiver according to the present invention.

FIG. 4 is a diagram showing an example of a computer display of inter-channel amplitude matching read from the monopulse radar transceiver according to the second embodiment.

FIG. 5 is a diagram showing Embodiment 3 of the monopulse level transceiver according to the present invention.

FIG. 6 is a diagram showing an example of a computer display of inter-channel phase matching read from the monopulse radar transceiver according to the third embodiment.

FIG. 7 is a diagram showing a conventional receiver characteristic measuring system.

FIG. 8 is a diagram showing a conventional inter-channel amplitude matching and inter-channel phase matching measurement system.

FIG. 9 is a diagram showing a conventional monopulse radar transceiver.

[Explanation of symbols]

1 monopulse radar transceiver, 2 standard signal generator,
3 spectrum analyzer, 4 network analyzer, 5 coherent oscillator, 6 transmission frequency converter, 7 local oscillator, 8 changeover switch, 9 transceiver controller, 10 modulator, 11 pseudo signal generator, 12
RF amplifier, 13 transmission / reception switcher, 14 Σ directional coupler, 15 Δ directional coupler, 16 Σ reception frequency converter, 17 ΣIF amplifier, 18 Σ variable attenuator, 19
Σ phase detector, 20 Δ reception frequency converter, 21 IF
Amplifier, 22 Variable attenuator, 23 Phase detector, 24
Measurement start switch, 25 measurement system controller, 26 I changeover switch, 27 IA / D converter, 28 Q changeover switch, 29 QA / D converter, 30 power calculator, 31
RAM, 32 external interface device, 33 IA / D
Conversion output selector switch, 34 Σ power calculator, 35 Q
A / D conversion output selector switch, 36 Δ power calculator, 3
7 subtractor, 38 Σ phase calculator, 39 Δ phase calculator.

Claims (3)

[Claims] 1. A monopulse radar transceiver having a pseudo signal generator capable of adding a Doppler frequency to a transmission signal and further level-controlling and injecting it into a reception system,
A received signal power detection circuit that detects the power at the receiver output end of the pseudo signal generated by the pseudo signal generator, and a RAM (random memory) that stores the power value detected by the received signal power detection circuit. Access memory) and the RAM
A monopulse radar transceiver, comprising: an external interface device for interfacing the power value stored in the transceiver to the outside of the transceiver, and a measurement system control circuit for controlling the Doppler frequency, the measurement target channel, and the measurement start. 2. A monopulse radar transceiver comprising a pseudo signal generator capable of adding a Doppler frequency to a transmission signal and further level-controlling and injecting the signal into a reception system, and a variable attenuator for controlling a receiver gain, Two reception signal power detection circuits for detecting the power at the Σ channel receiver output end and the Δ channel receiver output end of the pseudo signal generated by the pseudo signal generator, and the two reception signal power detection circuits. And a RAM that stores the power difference calculated by the subtracter.
(Random access memory), an external interface device that interfaces the power difference stored in the RAM to the outside of the transceiver, a receiver injection level of the pseudo signal, a variable attenuator setting value, a measurement target channel, and measurement A monopulse radar transceiver having a measurement system control circuit for controlling start. 3. A monopulse radar transceiver including a pseudo signal generator capable of adding a Doppler frequency to a transmission signal, further level-controlling and injecting the signal into a reception system, and a variable attenuator for controlling a receiver gain, Two reception signal phase detection circuits for detecting the phases of the pseudo signal generated by the pseudo signal generator at the Σ channel receiver output end and the Δ channel receiver output end, and the two reception signal phase detection circuits And a RAM that stores the phase difference calculated by the subtracter.
(Random access memory), an external interface device that interfaces the phase difference stored in the RAM to the outside of the transceiver, a receiver injection level of the pseudo signal, a variable attenuator setting value, a measurement target channel, and measurement A monopulse radar transceiver having a measurement system control circuit for controlling start.