JPH08271618A - Transmitter-receiver for radar - Google Patents

Abstract

PURPOSE: To obtain a transmitter-receiver which can ignore the influence of an unwanted signal such as a jamming signal, a crack signal or the like by a method wherein an RF low-noise amplifier, a power supply which applies a voltage to the RF low-noise amplifier and a local signal to a mixer are cut off when an ANL circuit is operated. CONSTITUTION: When an ANL circuit 12 is operated, an unwanted signal which has been received by an antenna 2 is passed through an RF low-noise amplifier 4, an RF front 1 and an IF amplifier 11 so as to be input to the circuit 12. Since it is not possible to sense only a regular reception noise, it is possible to prevent a gain from being set erroneously, and it is possible to perform an automatic noise level control operation precisely. That is to say, by an ANL operation signal 15 from the circuit 12, switches 14-S1, 14-S2, 14-S3 inside a switch module 14 are turned off, a voltage to the amplifier 4 and an amplifier 8 which constitute an active transmission-reception module Mn and a local signal to a mixer 9 are cut off. As a result, the unwanted signal is suppressed, and only a noise which is generated by a reception system can be sensed by the circuit 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic noise level control circuit (Automatic Noise Leveli).
ng, hereinafter referred to as an ANL circuit), the present invention relates to a radar transceiver configured to effectively block an unnecessary signal input from an antenna.

[0002]

2. Description of the Related Art A conventional device of this type is shown in FIG. In the figure, the active transceiver module M _n from M ₁ having the amplification and phase adjusting function of the transmitting and receiving each signal, 1 is amplified and IF (Intermediate Fr signals from the active transceiver module M _n
RF (Radio F) that converts to an "equency" signal
front end, 2 is an antenna for transmitting and receiving radio waves, 3 is a circulator that switches between transmitting and receiving, 4 is an RF low noise amplifier that amplifies the RF signal from the circulator 3, 5 is a circulator that switches between transmitting and receiving, and 6 is from the circulator 5. RF high-power amplifier for amplifying the RF signal of the RF signal, 7 is a phase shifter for changing the phase of the RF signal from the circulator 5 and the RF front end 2, and 8 is the RF from the active transceiver module M _n in the RF front end 1. R to amplify the signal
F low noise amplifier, 9 is a mixer that constitutes the RF front end 1, 10 is a local signal generator that gives a local signal to the mixer 9, 11 is an IF amplifier that amplifies the signal from the RF front end 1, and 12 is An ANL circuit (Automatic Noise) that plays a role of preventing fluctuations in signal noise level by keeping the gain of the receiving system circuit constant
Leveling).

Next, the operation will be described. The RF reception signals input to the active transmission / reception module Mn are adjusted in amplification phase, and the output signals from the active transmission / reception modules are combined and input to the RF front end 1. Here, it is amplified and IF-converted, and again amplified by the IF amplifier 11 connected to the output side thereof. This I
ANL circuit 12 connected to the output side of the F amplifier 11
As a result, it is possible to prevent the reception system gain from varying and the signal noise level to vary, because the performance of the electrical component or the like changes with temperature.

[0004]

The conventional radar transceiver as described above has the following problems. That is, in order to prevent the ANL noise from fluctuating due to the AGC / STC voltage, the AGC noise is detected during the ANL noise detection time.
The voltage is kept at 0V. Therefore, when a strong jamming is received at the time of this detection, the ANL circuit cannot detect only the normal reception noise, resulting in an incorrect reception system gain setting. The AGC voltage is set to ST because the tracking sensitivity changes or the tracking error is reduced due to the change in the signal level.
The C voltage is applied to each in order to prevent the receiver from being saturated in the search mode.

The present invention has been made to solve the above problems, and provides a transceiver for radar that effectively blocks unnecessary signals received by an antenna when the ANL circuit is operating.

[0006]

In a transceiver for a radar according to a first embodiment, a power source for applying a voltage to an RF low noise amplifier constituting an active transceiver module and an RF low noise amplifier constituting an RF front end, and The local signal to the mixer making up the RF front end is AN
By cutting off when the L circuit is activated, the influence of unwanted signals such as jamming signals and clutter signals is minimized.

In the radar transceiver according to the second embodiment, the RF low noise amplifier which constitutes the active transceiver module and the RF low noise amplifier which constitutes the RF front end apply a voltage to the power source and the input to the RF front end. By blocking the signal when the ANL circuit is activated, the influence of unnecessary signals such as jamming signals and clutter signals is minimized.

In the radar transceiver according to the third embodiment, a power source for applying a voltage to the RF low noise amplifier constituting the active transceiver module, an input signal to the RF front end and a mixer constituting the RF front end are provided. By blocking the local signal when the ANL circuit is activated, the influence of unwanted signals such as jamming signals and clutter signals is minimized.

In the radar transceiver according to the fourth embodiment, a power source for applying a voltage to the RF low noise amplifier constituting the active transceiver module and the RF low noise amplifier constituting the RF front end, and an input to the RF front end. By blocking the signal and the local signal to the mixer forming the RF front end when the ANL circuit is activated, the influence of unwanted signals such as jamming signals and clutter signals is minimized.

[0010]

In the transceiver for radar according to the first embodiment,
When the ANL circuit is activated, the power supply for applying a voltage to the RF low-noise amplifier that constitutes the active transceiver module and the RF low-noise amplifier that constitutes the RF front end and the local signal to the mixer that constitutes the RF front end are cut off. Unwanted signals such as jamming signals and clutter signals input to the system are suppressed, and the accuracy of the reception system gain setting is improved.

In the radar transceiver according to the second embodiment, when the ANL circuit is operating, a power source and an RF power source for applying a voltage to the RF low noise amplifier which constitutes the active transceiver module and the RF low noise amplifier which constitutes the RF front end.
Since the input signal to the front end is cut off, unnecessary signals such as jamming signals and clutter signals input to the reception system are suppressed, and the accuracy of the reception system gain setting is improved.

In the radar transceiver according to the third embodiment, when the ANL circuit is activated, a power source for applying a voltage to the RF low noise amplifier constituting the active transceiver module, R
Since it shuts off the input signal to the F front end and the local signal to the mixer that constitutes the RF front end,
Unwanted signals such as jamming signals and clutter signals input to the receiving system are suppressed, and the accuracy of the receiving system gain setting is improved.

In the radar transceiver according to the fourth embodiment, when the ANL circuit is in operation, the RF low noise amplifier forming the active transmitting / receiving module and the RF low noise amplifier forming the RF front end are supplied with a power source, RF. Since the input signal to the front end and the local signal to the mixer forming the front end are cut off, unnecessary signals such as jamming signals and clutter signals input to the receiving system are suppressed, and the accuracy of the receiving system gain setting is improved.

[0014]

【Example】

Example 1. FIG. 1 is a diagram showing a first embodiment of the present invention. In FIG. 1, M _n and 1 to 12 are shown in FIG. Reference numeral 13 is a power supply to the RF low noise amplifier 4 constituting the active transmission / reception module M _n and the RF low noise amplifier 8 constituting the RF front end 1, and 14 is a switch module for turning on and off each circuit when the ANL circuit is inactive and active. , 14-S1 is a first switch for turning on / off the power to the RF low noise amplifier 4, 14-S2 is a second switch for turning on / off the power to the RF low noise amplifier 8, 14-S2
-S3 is a third switch for turning on / off a local signal from the local signal generator 10 to the mixer 9 constituting the RF front end 1, and 15 is the switch module 1 described above.
An AN that informs the ANL circuit 12 that it is operating.
This is the L actuation signal.

The operation of the first embodiment will be described. A
When the NL circuit 12 operates, unwanted signals such as jamming signals and clutter signals received by the antenna 2 pass through the RF low noise amplifier 4, the RF front end 1 and the IF amplifier 11 and are input to the ANL circuit 12, where they are properly processed. Since it is impossible to detect only the received noise, it is possible to prevent an incorrect gain setting and to enable accurate automatic noise level control. That is, the ANL activation signal 1 from the ANL circuit 12
5 the first switch 1 in the switch module 14
4-S1, the second switch 14-S2 and the third switch 14-S3 are turned off, whereby the RF low noise amplifier 4 and the RF low noise amplifier 4 and the RF constituting the active transceiver module M _n are formed.
The voltage to the RF low noise amplifier 8 forming the front end 1 and the local signal from the local signal generator 10 to the mixer 9 forming the RF front end 1 are cut off. Therefore, the unnecessary signal is significantly suppressed, and the ANL circuit 12 can detect only the noise generated by the receiving system.

Example 2. FIG. 2 is a diagram showing a second embodiment of the present invention. In FIG. 2, M _n and 1 to 12 are shown in FIG. 13 is a power supply to the RF low noise amplifier 4 which constitutes the active transceiver module M _n , and 14 is A
A switch module 14-S1 is an RF low noise amplifier 4 for turning on and off each circuit when the NL circuit is inactive and active.
The first switch 14-S2 turns on / off the power source to the RF low noise amplifier 8, the second switch 14-S3 turns on / off the power source to the RF low noise amplifier 8, and 14-S3 transmits the RF signal from the active transceiver module M _n to the RF front end 1. A third switch for turning on and off, 15 is connected to the switch module 14
This is an ANL activation signal indicating that the NL circuit 12 is operating.

The operation of the second embodiment will be described. A
When the NL circuit 12 operates, unwanted signals such as jamming signals and clutter signals received by the antenna 2 pass through the RF low noise amplifier 4, the RF front end 1 and the IF amplifier 11 and are input to the ANL circuit 12, where they are properly processed. Since it is impossible to detect only the received noise, it is possible to prevent an incorrect gain setting and to enable accurate automatic noise level control. That is, the ANL activation signal 1 from the ANL circuit 12
5 the first switch 1 in the switch module 14
4-S1, the second switch 14-S2 and the third switch 14-S3 are turned off, whereby the RF low noise amplifier 4 and the RF low noise amplifier 4 and the RF constituting the active transceiver module M _n are formed.
The voltage to the RF low noise amplifier 8 constituting the front end 1 and the RF signal from the active transceiver module M _n to the RF front end 1 are cut off. Therefore, the unnecessary signal is significantly suppressed, and the ANL circuit 12 can detect only the noise generated by the receiving system.

Example 3. FIG. 3 is a diagram showing a third embodiment of the present invention. In FIG. 3, M _n and 1 to 12 are shown in FIG. 13 is a power supply to the RF low noise amplifier which constitutes the active transceiver module M _n , and 14 is an AN
A switch module for turning on / off each circuit when the L circuit is not activated and activated, 14-S1 is a first switch for turning on / off the power source to the RF low noise amplifier 4, and 14-S2 is an active transceiver module M _n to the RF front end. A second switch for turning the RF signal to 1 on and off, 14
-S3 is a third switch for turning on / off a local signal from the local signal generator 10 to the mixer 9 constituting the RF front end 1, and 15 is the switch module 1 described above.
An AN that informs the ANL circuit 12 that it is operating.
This is the L actuation signal.

The operation of the third embodiment will be described. A
When the NL circuit 12 operates, unwanted signals such as jamming signals and clutter signals received by the antenna 2 pass through the RF low noise amplifier 4, the RF front end 1 and the IF amplifier 11 and are input to the ANL circuit 12, where they are properly processed. Since it is impossible to detect only the received noise, it is possible to prevent an incorrect gain setting and to enable accurate automatic noise level control. That is, the ANL activation signal 1 from the ANL circuit 12
5, the first switch 14-S1 and the second switch 1
4-S2 and the third switch 14-S3 are turned off, thereby forming the active transceiver module M _n.
The voltage to the F low noise amplifier 4, the RF signal from the active transceiver module M _n to the RF front end 1 and the local signal from the local signal generator 10 to the mixer 9 forming the RF front end 1 are cut off. Therefore, the unnecessary signal is significantly suppressed, and the ANL circuit 12 can detect only the noise generated by the receiving system.

Example 4. FIG. 4 is a diagram showing a fourth embodiment of the present invention. In FIG. 4, M _n and 1 to 12 are shown in FIG. 13 is a power supply to the RF low noise amplifier which constitutes the active transceiver module M _n , and 14 is an AN
A switch module for turning on / off each circuit when the L circuit is inactive and operating, 14-S1 is a first switch for turning on / off the power source to the RF low noise amplifier 4, and 14-S2 is R.
A second switch for turning on / off the power supply to the F low noise amplifier 8, 14-S3 is a third switch for turning on / off the RF signal from the active transmission / reception module M _n to the RF front end 1.
, 14-S4 is a fourth switch for turning on / off the local signal from the local signal generator 10 to the mixer 9 constituting the RF front end 1, and 15 is the switch module 14 to which the ANL circuit 12 is operating. Is an ANL actuation signal for informing.

The operation of the fourth embodiment will be described. A
When the NL circuit 12 operates, unwanted signals such as jamming signals and clutter signals received by the antenna 2 pass through the RF low noise amplifier 4, the RF front end 1 and the IF amplifier 11 and are input to the ANL circuit 12, where they are properly processed. Since it is impossible to detect only the received noise, it is possible to prevent an incorrect gain setting and to enable accurate automatic noise level control. That is, the ANL activation signal 1 from the ANL circuit 12
5, the switch 14-S1 and the second switch 14-S
2, the third switch 14-S3 and the fourth switch 14
-S4 is turned off, whereby the voltage to the RF low-noise amplifier 4 and the RF low-noise amplifier 8 that form the RF front end 1 that constitutes the active transceiver module M _n, and the RF from the active transceiver module M _n to the RF front end 1 RF from signal and local signal generator 10
The local signal to the mixer 9 forming the front end 1 is cut off. Therefore, the unnecessary signal is significantly suppressed, and the ANL circuit 12 can detect only the noise generated by the receiving system.

[0022]

According to the first, second, third and fourth embodiments, as described above, unnecessary signals such as jamming signals when the ANL circuit is activated are compared with the conventional radar transceiver. Can be ignored. Therefore, there is an effect that the ANL circuit is properly operated and the setting accuracy of the reception system gain is improved.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a radar transceiver according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a radar transceiver according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a radar transceiver according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram of a conventional radar transceiver.

[Explanation of symbols]

M _n active transceiver module, 1 RF front end, 2 antennas, 3 circulator, 4 RF
Low noise amplifier, 5 circulator, 6 RF high output amplifier, 7 phaser, 8 RF low noise amplifier, 9 mixer, 10 local signal generator, 11 IF amplifier, 1
2 ANL circuit, 13 power supply, 14 switch module, 14-S1 first switch, 14-S2 second switch, 14-S3 third switch, 14-S4
Fourth switch, 15 ANL actuation signal.

Claims (4)

[Claims] 1. An active transmission / reception module and RF (Ra) which is a composite output of the active transmission / reception module.
Amplify the signal and the IF
An RF front end for converting into an (Intermediate Frequency) signal, an IF amplifier for amplifying an output signal of the RF front end, and an IF amplifier connected to the output side of the amplifier for varying the reception gain and varying the noise level of the signal. An automatic noise level control circuit for preventing the power supply, a power source for applying a voltage to an RF low noise amplifier forming the active transmitting / receiving module, a local signal generator for supplying a local signal to a mixer forming the front end, and the active transmitting / receiving module The first switch for turning on / off the power supply to the RF low noise amplifier, the second switch for turning on / off the power supply to the RF low noise amplifier in the RF front end, and the on / off switch for the local signal to the RF front end. To have a third switch to Characteristic radar transceiver. 2. An active transmission / reception module and RF (Ra) which is a combined output of the active transmission / reception module.
Amplify the signal and the IF
An RF front end for converting into an (Intermediate Frequency) signal, an IF amplifier for amplifying an output signal of the RF front end, and an IF amplifier connected to the output side of the amplifier for varying the reception gain and varying the noise level of the signal. An automatic noise level control circuit for preventing the power supply, a power source for applying a voltage to an RF low noise amplifier forming the active transmitting / receiving module, a local signal generator for supplying a local signal to a mixer forming the front end, and the active transmitting / receiving module And a second switch for turning on / off the power supply to the RF low noise amplifier, a second switch for turning on / off the power supply to the RF low noise amplifier in the RF front end, and an on / off switch for the RF signal to the RF front end. Characterized by having a third switch to A transceiver for radar. 3. An active transmission / reception module and RF (Ra) which is a composite output of the active transmission / reception module.
Amplify the signal and the IF
An RF front end for converting into an (Intermediate Frequency) signal, an IF amplifier for amplifying an output signal of the RF front end, and an IF amplifier connected to the output side of the amplifier for varying the reception gain and varying the noise level of the signal. An automatic noise level control circuit for preventing the power supply, a power source for applying a voltage to an RF low noise amplifier forming the active transmitting / receiving module, a local signal generator for supplying a local signal to a mixer forming the front end, and the active transmitting / receiving module The first switch that turns on and off the power supply to the RF low noise amplifier, the second switch that turns on and off the RF signal to the RF front end, and the third switch that turns on and off the local signal to the RF front end. Radar transmission characterized by having Receiving machine. 4. An active transmission / reception module and RF (Ra) which is a combined output of the active transmission / reception module.
Amplify the signal and the IF
An RF front end for converting into an (Intermediate Frequency) signal, an IF amplifier for amplifying an output signal of the RF front end, and an IF amplifier connected to the output side of the amplifier for varying the reception gain and varying the noise level of the signal. An automatic noise level control circuit for preventing the power supply, a power source for applying a voltage to an RF low noise amplifier forming the active transmitting / receiving module, a local signal generator for supplying a local signal to a mixer forming the front end, and the active transmitting / receiving module The first switch for turning on / off the power supply to the RF low-noise amplifier, the second switch for turning on / off the power supply to the RF low-noise amplifier in the RF front end, and the on / off switch for the RF signal to the RF front end. A third switch,
A radar transceiver, comprising a fourth switch for turning on / off a local signal to an RF front end.