JP2001124844A - Radar excitation receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems that the number of reception systems requires is increased corresponding to the number of antennas because the number of reception systems the same as the number of antennas is necessary, the dimension and weight of a radar excitation receiver are increased and also the power consumption and price are increased. SOLUTION: Signals from two antennas are combined together into a single first intermediate frequency with a slight difference in frequency. Alternatively, signals from two antennas are alternately converted into a single intermediate frequency at a high speed. In another way, one of signals from two antennas is delayed by a great time so that the signals are converted into a single intermediate frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar having a plurality of antennas and a plurality of receiving systems corresponding to the antennas, and forming an antenna beam pattern by digitally processing output signals of these receiving systems. The present invention relates to a configuration of a radar excitation receiver used for an apparatus.

[0002]

2. Description of the Related Art FIG. 11 is a diagram showing the structure of a conventional radar excitation receiver of this type. In the figure, reference numerals 1a, 1b, 1
c, 1d are reception signal input terminals, 2a, 2b, 2c, 2d
Are the first high-frequency amplifiers, 11a, 11b, 11c, 11
d is a gain control circuit, 17a, 17b, 17c and 17d are reception signal output terminals, 24 is a first oscillation circuit, and 25 is a second oscillation circuit.
Oscillation circuit, 26 is a first power divider, 27 is a pulse modulation circuit, 28 is a second power divider, 29 is a third bandpass filter, 30 is a third frequency mixer, and 31 is a second high frequency. An amplifier, 32 is a transmission signal output terminal, 33 is a frequency multiplier, 50a, 50b, 50c, 50d are first local signal input terminals, 52a, 52b, 52c, 52d are second local signal input terminals, and 70 is a direct signal. Digital synthesizers, 75a, 75b, 75c, 75d are first frequency mixers, 76a, 76b, 76c, 76d are first bandpass filters, 77a, 77b, 77c, 77d are second frequency mixers, 78a, 78b, 78c , 78d are second bandpass filters, 79a, 79b, 79c, 79d are receiving systems, 80 is a fourth power divider, and 81 is a third power divider.

Next, the operation will be described. Oscillation circuit 24
Is divided into two by the power divider 26, and one of the two is frequency-multiplied by the frequency multiplier 33,
A clock signal for the direct digital synthesizer 70. The direct digital synthesizer 70 generates a signal having a frequency slightly lower than the output signal frequency of the oscillation circuit 24, and this signal is transmitted to four receiving systems 79 by the power divider 81.
a, 79b, 79c, 79d are supplied to the second local signal input terminals 52a, 52b, 52c, 52d. The other reference signal distributed by the first power distributor 26 is pulse-modulated by the pulse modulation circuit 27. on the other hand,
The high-frequency signal generated by the second oscillation circuit 25 is divided into two by a second power divider 28, one of which is frequency-mixed with the output signal of the pulse modulation circuit 27 by a third frequency mixer 30, and is used for a radar device. Only the transmission frequency pulse signal is
After being extracted by the band-pass filter 29, the signal is amplified to a required level by the second high-frequency amplifier 31 and output from the transmission signal output terminal 32 to the antenna as a transmission signal of the radar device. The other signal divided into two by the second power divider is divided by the fourth power divider 80 into first local signal input terminals 50a and 50b of each of the four receiving systems 79a, 79b, 79c and 79d. , 50c, 50d. A reception signal of the radar device received by one antenna is input to a reception signal input terminal 1a, amplified by a first high-frequency amplifier 2a, and amplified by a first frequency mixer 75a.
Is mixed in frequency with the signal of the first local signal input terminal 50a, and only the first intermediate frequency component is
After being extracted by 6a, the signal is adjusted to an appropriate level by the gain control circuit 11a and frequency-mixed with the signal from the second local signal input terminal 52a by the second frequency mixer 77a.
Only the intermediate frequency component is extracted by the second bandpass filter 78a, amplified to a required level by the intermediate frequency amplifier 16a, and output from the reception signal output terminal 17a to the signal processing device of the radar device. This received signal input terminal 1
a to the reception signal output terminal 17a, a reception system similar to the reception system 79a, in addition to the first reception system 79a,
A total of 4 from the second receiving system 79b to the fourth receiving system 79d
And frequency-convert and amplify received signals from antennas corresponding to the respective receiving systems, and output the signals to the corresponding signal processing devices.

[0004]

Since the conventional radar excitation receiver is configured as described above, the same number of reception systems as the number of antennas are required. Therefore, when used in a radar apparatus having a large number of antennas, the number of receiving systems is increased, and the size and weight of the radar excitation receiver are increased, and the power consumption is increased.
In addition, there is a problem that the cost of the radar excitation receiver increases because the number of parts increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce the number of receiving systems by half, thereby reducing the size and weight of a radar excitation receiver and reducing power consumption. It is another object of the present invention to reduce the number of parts and to construct a radar excitation receiver at low cost.

[0006]

The radar excitation receiver according to the first invention uses two direct digital synthesizers to form two types of first local oscillation signals and two types of corresponding second local oscillation signals. And supplying these signals to a receiving system, and inputting the received signals from the two antennas to one receiving system, and converting them into a first intermediate frequency using different first local oscillation signals. Further, after the two signals are power-combined, unnecessary waves are removed and gain control is performed to divide the signals into two, and the two signals are converted to a second intermediate frequency using different second local oscillation signals, and unnecessary waves are removed. From 2 each
It is configured to output to a signal processing device as reception signals from two antennas. For this reason, the reception signals from the two antennas can be processed by one reception system, so that the number of the reception systems of the radar excitation receiver becomes half of the number of the antennas, thereby reducing the size and weight of the radar excitation receiver, Power consumption is reduced. Further, the number of parts is reduced, and the radar excitation receiver can be configured at low cost.

The radar excitation receiver according to the second aspect of the present invention always uses two direct digital synthesizers and operates so that the oscillation frequency of one direct digital synthesizer is always switched to two values at high speed. The first that switches to two frequencies at high speed
And a second local oscillation signal are generated and supplied to the receiving system. The first local oscillation signal is generated by the first diplexer in the receiving system, and the second local oscillation signal is generated in the receiving system by the first diplexer. In the second diplexer, the signals are separated into two, and the signals received from the two antennas are input to one receiving system, and each signal is converted to a first intermediate frequency using the first local oscillation signal. Then, after the two signals are power-combined, unnecessary waves are removed and gain control is performed to divide the two signals, and the two signals are converted to a second intermediate frequency using the second local oscillation signal, and the unnecessary waves are removed. Each is configured to output to a signal processing device as a reception signal from two antennas. For this reason, the reception signals from the two antennas can be processed by one reception system, so that the number of the reception systems of the radar excitation receiver becomes half of the number of the antennas, thereby reducing the size and weight of the radar excitation receiver, Power consumption is reduced. Further, the number of parts is reduced, and the radar excitation receiver can be configured at low cost.

A radar excitation receiver according to a third aspect of the present invention inputs signals received from two antennas to one receiving system, and always switches one of the signals at a high speed by a first high-frequency switch. Select, convert the selected signal to a first intermediate frequency, remove unnecessary waves,
The signal is converted into an intermediate frequency, the signal of the second intermediate frequency is separated and separated into reception signals from two antennas by a second high-frequency switch synchronized with the first high-frequency switch, and amplified, and then each of the signals is output from the two antennas. Is output to the signal processing device as the received signal of the above. Therefore 2
Since the signals received from one antenna can be processed by one receiving system, the number of receiving systems of the radar excitation receiver becomes half of the number of antennas, thereby reducing the size and weight of the radar excitation receiver and reducing power consumption. Less. Further, the number of parts is reduced, and the radar excitation receiver can be configured at low cost.

In a radar excitation receiver according to a fourth aspect of the present invention, after signals received from two antennas are input to one receiving system and amplified, only a signal received from one antenna is received by a first high-frequency delay unit. , And power-combines the two signals. After that, the signal is converted to the first intermediate frequency, unnecessary waves are removed, the gain is controlled, and the signal is converted to the second intermediate frequency.
The signal of the second intermediate frequency is selectively separated into reception signals from the two antennas by a second high-frequency switch synchronized with the first high-frequency switch, and the time delay is not performed after removing unnecessary waves. Only the reception signal is time-delayed by the second high-frequency delay device, and then output to the signal processing device as reception signals from two antennas. For this reason, the reception signals from the two antennas can be processed by one reception system, so that the number of the reception systems of the radar excitation receiver becomes half of the number of the antennas, thereby reducing the size and weight of the radar excitation receiver, Power consumption is reduced. Further, the number of parts is reduced, and the radar excitation receiver can be configured at low cost.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a first embodiment of the present invention.
1b is a first reception signal input terminal, 2a and 2b are first high-frequency amplifiers, 3a and 3b are first local signal input terminals,
a and 4b are first power combiners; 5a and 5b are first frequency mixers; 6a and 6b are second received signal input terminals;
a and 7b are second high frequency amplifiers; 8a and 8b are second local signal input terminals; 9a and 9b are second frequency mixers;
0a and 10b are first bandpass filters, 11a and 11b are gain control circuits, 12a and 12b are first power dividers,
3a and 13b are third local signal input terminals, 14a and 14
b is a second bandpass filter, 15a and 15b are third frequency mixers, 16a and 16b are first intermediate frequency amplifiers,
7a, 17b are first reception signal output terminals, 18a, 18
b is a fourth local signal input terminal, 19a and 19b are third bandpass filters, 20a and 20b are fourth frequency mixers,
21a, 21b are second intermediate frequency amplifiers, 22a, 22
b is a second reception signal output terminal, and 23a and 23b are reception systems. 24 is a first oscillation circuit, 25 is a second oscillation circuit, 26 is a second power divider, 27 is a pulse modulation circuit, 28 is a third power divider, 29 is a fourth bandpass filter, 30 is a fifth frequency mixer, 31 is a third high frequency amplifier, 32 is a transmission signal output terminal, 33 is a frequency multiplier,
Reference numerals 34, 35, and 36 denote first, second, and third direct digital synthesizers, 37, a fifth bandpass filter, 38, a sixth frequency mixer, 39, a fourth power divider, and 40, 41, respectively. Fifth and sixth power distributors, 4
2 is a sixth bandpass filter, 43 is a seventh frequency mixer,
44 is a seventh bandpass filter, 45 is an eighth frequency mixer, and 46, 47, 48, and 49 are seventh, eighth, ninth, and tenth power distributors, respectively.

Next, the operation will be described. The first oscillating circuit 24 generates a signal having a frequency fco and outputs
Is divided into two by the power distributor 26 of FIG. One of the two divided signals is pulse-modulated by the pulse modulation circuit 27 to the transmission pulse width of the radar device. The second oscillating circuit 25 oscillates a signal of the frequency fst, and its output signal is split into two by a third power splitter 28. One of the two divided signals is frequency-mixed with the output signal of the pulse modulator 27 by the fifth frequency mixer 30, and only the frequency component shown in Expression 1 is extracted by the fourth bandpass filter 29.

[0012]

(Equation 1)

Thereafter, the signal is amplified to an appropriate level by a third high-frequency amplifier 31, and then output from a transmission signal output terminal 32 as a transmission pulse signal of the radar device to an antenna of the radar device. On the other hand, the other signal divided into two by the second power divider 26 is frequency-multiplied by the frequency multiplier 33 and then used as a clock signal for the three subsequent direct digital synthesizers 34, 35, 36. You. The first direct digital synthesizer 34 generates a signal having a frequency fout, and an output signal of the first direct digital synthesizer 34 is frequency-mixed with the other signal divided into two by the third power divider 28 by a sixth frequency mixer 38.
The fifth bandpass filter 37 extracts only the frequency components shown in Expression 1. Thereafter, the second power is distributed by the fourth power distributor 39. The second direct digital synthesizer 35 generates a signal having a frequency f1 and the third direct digital synthesizer 36 generates a signal having a frequency higher than the frequency f1 by Δf. After being divided into two by the sixth power distributor 41, ninth and tenth power distributors 48,
49 and the first and second receiving systems 23
a, 23b each of the third local signal input terminals 13
a, 13b and a fourth local signal input terminal 18a, 18b. The signal of the other frequency f1 divided into two by the fifth power divider 40 is frequency-mixed by the seventh frequency mixer 43 with the output signal of one of the fourth power dividers 39 to form a sixth band. The filter 42 extracts only the frequency components shown in Expression 2.

[0014]

(Equation 2)

Thereafter, the signal is split into two by a seventh power divider 46 and supplied to the first local signal input terminals 3a and 3b of the first and second receiving systems 23a and 23b. The other frequency-divided signal divided by the sixth power divider 41 whose frequency is higher than f1 by Δf is converted by the eighth frequency mixer 45 into the other output signal of the fourth power divider 39 and the frequency. The frequency components are mixed, and only the frequency components shown in Expression 3 are extracted by the seventh band filter 44.

[0016]

(Equation 3)

Thereafter, the signal is split into two by an eighth power divider 47 and supplied to the second local signal input terminals 8a and 8b of the first and second receiving systems 23a and 23b.

On the other hand, received signals of the radar apparatus received by two different antennas are input to first and second received signal input terminals 1a and 6a, respectively. At this time,
The frequency of the reception signal is equal to the signal frequency of the transmission signal output terminal 32 and is expressed by Equation 1. First received signal input terminal 1a
The received signal of the radar device input to the first frequency mixer 5a is amplified by a first high-frequency amplifier 2a, and then amplified by a first frequency mixer 5a.
At a, the signal is frequency-mixed with the signal supplied to the first local signal input terminal 3a. At this time, the first frequency mixer 5
The output signal frequency of “a” is expressed by Expression 4.

[0019]

(Equation 4)

The reception signal of the radar device input to the second reception signal input terminal 6a is amplified by a second high-frequency amplifier 7a, and then amplified by a second frequency mixer 9a. The frequency is mixed with the signal input terminal 8a. The output signal frequency of the second frequency mixer 9a at this time is represented by Expression 5.

[0021]

(Equation 5)

The first and second frequency mixers 5a, 5a,
The output signal 9a is synthesized by the first power combiner 4a and input to the first bandpass filter 10a. FIG. 2 shows the frequency characteristics of the first bandpass filter 10a. Therefore, the frequency component of the output signal of the first bandpass filter 10a is given by Equation 6.

[0023]

(Equation 6)

That is, signals received from two different antennas are converted into a first intermediate frequency having a frequency different by Δf, and are combined into one signal. The received signals from the two antennas converted to the first intermediate frequency are amplified to an appropriate level by the gain control circuit 11a, and then split into two by the first power splitter 12a. Here, the gain control circuit 11a and the first power divider 12a have a frequency band that can handle the signal output from the first bandpass filter 10a. One of the two split signals is the third frequency mixer 1
At 5a, the signal is frequency-mixed with the signal from the third local signal input terminal 3. The output signal frequency of the third frequency mixer 15a at this time is expressed by Expression 7.

[0025]

(Equation 7)

FIG. 3 shows the frequency characteristics of the second bandpass filter 14a. Therefore, the second bandpass filter 1
The frequency component of the output signal of 4a is given by equation (8).

[0027]

(Equation 8)

Thereafter, the output signal of the second bandpass filter 14a is amplified by the first intermediate frequency amplifier 16a.
The first reception signal output terminal 17a is used as a second intermediate frequency signal of the reception signal input to the first reception signal input terminal 1a.
Is output to the signal processing device of this radar device. Further, one of the other signals divided into two by the first power divider 1 is frequency-mixed with the signal from the fourth local signal input terminal 18a by the fourth frequency mixer 20a.
The output signal frequency of the fourth frequency mixer 20a at this time is expressed by Expression 9.

[0029]

(Equation 9)

FIG. 4 shows the frequency characteristics of the second bandpass filter 19a. Therefore, the second bandpass filter 14a
The frequency component of the output signal is After that, the output signal of the third bandpass filter 19a is amplified by the second intermediate frequency amplifier 21a, and then the second reception signal input terminal 6a
The second intermediate frequency signal of the received signal input to the second
Is output from the reception signal output terminal 22a of the radar device to the signal processing device of the radar device. As described above, the first reception system including the first reception signal input terminal 1a and the second reception signal input terminal 6a to the first reception signal output terminal 17a and the second reception signal output terminal 22a. There is a second receiving system 23b having the same configuration as that of the second receiving system 23a.
3b converts the signals received from the two antennas into a second intermediate frequency, amplifies the signals, and outputs the converted signals to the signal processing device of the radar device, similarly to the first receiving system 23a. In addition,
FIG. 1 shows the configuration of a radar excitation receiver in a radar apparatus having four antennas. In a radar apparatus having five or more antennas, the number of reception systems is increased.

Embodiment 2 FIG. 5 is a block diagram showing Embodiment 2 of the present invention. In the drawing, reference numerals 1a and 1b denote first reception signal input terminals, 2a and 2b denote first high-frequency amplifiers, 4a and 4b denote power combiners, 5a and 5b are first frequency mixers; 6a and 6b are second received signal input terminals;
a and 7b are second high-frequency amplifiers; 9a and 9b are second frequency mixers; 10a and 10b are first bandpass filters;
1a and 11b are gain control circuits, 12a and 12b are first power dividers, 14a and 14b are second bandpass filters,
5a and 15b are third frequency mixers, 16a and 16b are first intermediate frequency amplifiers, 17a and 17b are first reception signal output terminals, 19a and 19b are third bandpass filters,
0a and 20b are fourth frequency mixers, 21a and 21b are second intermediate frequency amplifiers, and 22a and 22b are second reception signal output terminals. 24 is a first oscillation circuit;
Is a second oscillation circuit, 26 is a second power divider, 27 is a pulse modulation circuit, 28 is a third power divider, 29 is a fourth bandpass filter, 30 is a fifth frequency mixer, and 31 is a 3
, A transmission signal output terminal 32, a frequency multiplier 33, a first direct digital synthesizer 34, a fifth bandpass filter 37, a sixth frequency mixer 38, and first local mixers 50a and 50b. Signal input terminal, 51
a and 51b are first diplexers, 52a and 52b are second local signal input terminals, 53a and 53b are second diplexers, 54a and 54b are reception systems, 55 is a second direct digital synthesizer, and 56 is a control circuit. , 57 are a fourth power divider, 58 is a sixth bandpass filter, 59 is a seventh frequency mixer, and 60 and 61 are fifth and sixth power dividers.

Next, the operation will be described. The signal of the frequency fco generated by the first oscillation circuit 24 passes through the second power divider 26, is pulse-modulated by the pulse modulation circuit 27, and is then modulated by the fifth frequency mixer 30 into the second oscillation circuit 25.
The signal of the frequency fst created by the third power distributor 28
The frequency is mixed with one of the two components, and the fourth bandpass filter 29 extracts only the component of the sum of the frequencies fst and fco, and the third high-frequency amplifier 31 amplifies the component to an appropriate level. Outputting from 32 to the antenna is the same as in the first embodiment. On the other hand, the second
The other signal that has been split into two by the power divider 26 is frequency-multiplied by the frequency multiplier 33 and then used as a clock signal for two direct digital synthesizers 34 and 55 at the subsequent stage.

First direct digital synthesizer 3
4 generates a signal of frequency fout, and the other signal of frequency fst, which is divided into two by the fourth power divider 28, is frequency-mixed by the sixth frequency mixer 38. Only the frequency components shown in Equation 1 are extracted. Also, the second direct digital synthesizer 55
Is a signal of frequency f1 and f1
A signal having a frequency higher by Δf is alternately switched at high speed to oscillate. The signal whose frequency is switched at a high speed is divided into two by a fourth power divider 57, and one of the signals is further divided by a sixth power divider 61 to each of the two receiving systems 54a and 54b. Second local signal input terminal 5
2a and 52b. In addition, the fourth power distributor 57
The other output is mixed in frequency with the output of the fifth bandpass filter 37 and the seventh frequency mixer 59, and the frequency represented by Expressions 2 and 3 is switched at high speed by the sixth bandpass filter 58. Only the present signal component is extracted. After that, the first local signal input terminal 50 of each of the two receiving systems 54a and 54b is split by the fifth power divider 60.
a, 50b. Further, when a signal having a frequency represented by Expression 2 is supplied to the first local signal input terminals 50a and 50b, the second local signal input terminals 52a and 52b are provided.
b, a signal having a frequency f1 is supplied to the first local signal input terminals 50a and 50b, and when a signal having a frequency represented by Expression 3 is supplied to the first local signal input terminals 50a and 50b, the second local signal input terminal 52 is provided.
Signals having a frequency higher than f1 by Δf are supplied to a and 52b.

On the other hand, the reception signals of this radar device received by two different antennas are input to first and second reception signal input terminals 1a and 6a, respectively. At this time,
The frequency of the reception signal is equal to the signal frequency of the transmission signal output terminal 32 and is expressed by Equation 1. First local signal input terminal 50
a is supplied to the first frequency mixer 5a when the frequency of the signal is represented by the equation (2), and to the second frequency mixer 9a when the frequency of the signal is represented by the equation (3).
1a. The reception signal of the radar device input to the first reception signal input terminal 1a is amplified by the first high-frequency amplifier 2a, and then is amplified by the first frequency mixer 5a with the signal from the first diplexer 51a. The frequencies are mixed. At this time, the output signal of the first frequency mixer 5a is temporally intermittent, and the frequency is represented by Expression 4.
The reception signal of the radar device input to the second reception signal input terminal 6a is amplified by the second high-frequency amplifier 7a, and then, is amplified by the second frequency mixer 9a with the signal from the first diplexer 51a. The frequencies are mixed. At this time, the output signal of the second frequency mixer 5a also becomes temporally intermittent, and the frequency is represented by Expression 5. The output signals of the first frequency mixer 5a and the second frequency mixer 9a are combined by the power combiner 4a and input to the first bandpass filter 10a.
Here, the frequency characteristics of the first bandpass filter 10a are as shown in FIG. 2 as in the case of the first embodiment. Therefore, the output signal of the first bandpass filter 10a is such that the frequency components shown in Equation 6 are output alternately. That is, the received signals from the two different antennas are converted and combined by switching at high speed alternately with time to the first intermediate frequency having a frequency different by Δf.

The received signals from the two antennas converted to the first intermediate frequency are amplified to an appropriate level by a gain control circuit 11a, and then amplified by a first power divider 12a.
Be distributed. On the other hand, the signal supplied to the second local signal input terminal is supplied to the third frequency mixer 15a when the signal frequency is f1, and to the fourth frequency mixer 20a when the signal frequency is larger than Δ1 by Δf. It is supplied separately by the second diplexer 53a. When the frequency of the signal supplied to the second local signal input terminal 52a is f1, the signal of this frequency f1 and the first power divider 12a
Is mixed in frequency with the third frequency mixer 15a. At this time, the output signal of the third frequency mixer 15a is temporally intermittent, that is, pulse-shaped, and the output signal frequency when an output signal exists is several tens.

[0036]

(Equation 10)

The frequency characteristic of the second bandpass filter 14a is the same as that of the first embodiment and is shown in FIG. Therefore, as the output signal of the second bandpass filter 14a, a signal whose frequency component is represented by Expression 8 is output intermittently in time. Thereafter, the output signal of the second bandpass filter 14a is amplified by the second intermediate frequency amplifier 21a, and then output from the first reception signal output terminal 22a to the signal processing device of the radar device. That is, the second intermediate frequency signal of the signal input to the first reception signal input terminal 1a is output intermittently from the first reception signal output terminal. If the frequency of the signal supplied to the second local signal input terminal 52a is higher than f1 by Δf, this signal and the first
And one output signal of the power divider 12a is frequency-mixed by the fourth frequency mixer 20a. At this time, the output signal of the fourth frequency mixer 20a is temporally intermittent, that is, in the form of a pulse, and the output signal frequency when an output signal is present is represented by Formula 11.

[0038]

[Equation 11]

The frequency characteristic of the third bandpass filter 19a is the same as that of the first embodiment and is shown in FIG. Therefore, as the output signal of the third bandpass filter 19a, a signal whose frequency component is represented by Expression 8 is output intermittently in time. Then, after being amplified by the second intermediate frequency amplifier 21a, the signal is output from the second reception signal output terminal 22a to the signal processing device of the radar device. That is, the second intermediate frequency signal of the signal input to the second reception signal input terminal 6a is output intermittently from the second reception signal output terminal 22a. FIG. 6 shows the temporal operation of each unit described so far. As described above, the first reception signal input terminal 1a and the second reception signal input terminal 6a to the first reception signal output terminal 17a and the first reception signal output terminal 22a. There is a second receiving system 23b having the same configuration as the receiving system 23a. The second receiving system 23b converts and amplifies signals received from the two antennas into a second intermediate frequency in the same manner as the first receiving system 23a. Then, the signal is output to the signal processing device of the radar device. Here, the receiving systems 54a, 54
Since the repetition time of the temporally intermittent received signal output by 4b is sufficiently short, signal processing can be performed by the radar signal processing device. FIG. 5 shows the configuration of a radar excitation receiver in a radar apparatus having four antennas. In a radar apparatus having five or more antennas, the number of reception systems is increased.

Embodiment 3 FIG. 7 is a block diagram showing Embodiment 3 of the present invention. In the drawing, reference numerals 1a and 1b denote first reception signal input terminals, 2a and 2b denote first high-frequency amplifiers, and 6a and 6b denote second reception. Signal input terminal, 7a, 7b
Is a second high frequency amplifier, 11a and 11b are gain control circuits, 16a and 16b are first intermediate frequency amplifiers, 17a and 17a.
17b is a first reception signal output terminal, 21a and 21b are second intermediate frequency amplifiers, and 22a and 22b are second reception signal output terminals. 24 is a first oscillation circuit, 25 is a second oscillation circuit, 26 is a second power divider, 27 is a pulse modulation circuit, 28 is a third power divider, 29 is a fourth bandpass filter, Reference numeral 30 denotes a fifth frequency mixer, 31 denotes a third high-frequency amplifier, 32 denotes a transmission signal output terminal, 33 denotes a frequency multiplier, and 50a and 50b denote first local signal input terminals.
2a and 52b are second local signal input terminals, 60 and 61 are fourth and third power distributors, 62a and 62b are first high frequency switches, 63a and 63b are first frequency mixers, 6
4a and 64b are first bandpass filters, 65a and 65b are second frequency mixers, 66a and 66b are second bandpass filters, 67a and 67b are second high frequency switches, 68
a and 68b are control circuits; 69a and 69b are reception systems;
Is a direct digital synthesizer.

Next, the operation will be described. The signal of the frequency fco generated by the first oscillation circuit 24 passes through the second power distributor 26, is pulse-modulated by the pulse modulation circuit 27, and is then modulated by the third frequency mixer 30 into the second oscillation circuit 2
5 to the second power divider 2
8, the frequency is mixed with one of the two components, and the third band-pass filter 29 extracts only the sum of the components fst and fco, and the third high-frequency amplifier 31 amplifies it to an appropriate level to output the transmission signal. The output from the terminal 32 to the antenna is the same as in the first embodiment. On the other hand, the other signal split into two by the second power splitter 26 is
After being frequency-multiplied by the frequency multiplier 33, it is used as a clock signal of a direct digital synthesizer 70 at the subsequent stage. The direct digital synthesizer 70 generates a signal of the frequency fout,
, And the first and second receiving systems 69a, 69
9b are supplied to respective second local signal input terminals 52a, 52b. The other signal distributed by the second power distributor 28 is further divided into two by the fourth power distributor 60, and the first local signals of the first and second receiving systems 69a and 69b are respectively provided. The signal is supplied to the signal input terminals 50a and 50b.

On the other hand, the received signals of the radar device received by two different antennas are input to first and second received signal input terminals 1a and 6a, respectively. At this time,
The frequency of the reception signal is equal to the signal frequency of the transmission signal output terminal 32 and is expressed by Equation 1. After these two received signals are amplified by the first high-frequency amplifier 2a and the second high-frequency amplifier 7a, one of them is selected by the first high-frequency switch 62a. The first high-frequency switch 62a repeats the switching operation at a high speed by a signal from the control circuit 68a. The output signal of the first high-frequency switch 63a is frequency-mixed with the signal from the first local signal input terminal 50a by the first frequency mixer 63a. At this time, the output signal frequency of the first frequency mixer is expressed by Expression 12.

[0043]

(Equation 12)

From the output signal of the first frequency mixer, only the component whose frequency is fco is extracted by the first bandpass filter 64a. As a result, the output signal of the first bandpass filter 64a becomes the first intermediate frequency of the reception system 69a, and the signal component from the first reception signal input terminal 1a and the signal component from the second reception signal input terminal 6a in time. The component is switched at high speed. Thereafter, the signal is amplified to an appropriate level by the gain control circuit 11a, and then the second frequency mixer 65
At a, the signal is frequency-mixed with the signal from the second local signal input terminal 52a. The frequency component of the output signal of the second frequency mixer 65a is given by Expression 13.

[0045]

(Equation 13)

Of the output signal of the second frequency mixer 65a, only the component whose frequency component is represented by the formula 8 is extracted by the second bandpass filter 66a, and the second high-frequency switch 67a
To enter. The second high-frequency switch 67a operates in synchronization with the first high-frequency switch 62a by the control circuit 68a in time, and at the timing when the signal of the component of the first reception signal input terminal 1a is input, It operates to output a signal to the first intermediate frequency amplifier 16a and to output the signal to the second intermediate frequency amplifier 21a at the timing when the signal of the component of the second received signal input terminal 6a is input. First and second intermediate frequency amplifiers 16a, 21a
The signal amplified to an appropriate level is output from the reception signal output terminals 17a and 22a as a temporally intermittent signal to the signal processing device of the radar device. FIG. 8 shows the temporal operation of each unit described so far. As described above, the first reception signal input terminal 1a and the second reception signal input terminal 6a to the first reception signal output terminal 17a and the first reception signal output terminal 22a. There is a second receiving system 69b having the same configuration as the receiving system 69a, and the second receiving system 69b converts and amplifies received signals from the two antennas to a second intermediate frequency in the same manner as the first receiving system 69a. Then, the signal is output to the signal processing device of the radar device. Here, the temporally intermittent reception signals output by the reception systems 69a and 69b have sufficiently short repetition times, so that signal processing can be performed by the radar signal processing device. FIG. 7 shows a configuration of a radar excitation receiver in a radar apparatus having four antennas. In a radar apparatus having five or more antennas, the number of reception systems is increased.

Embodiment 4 FIG. 9 is a block diagram showing a fourth embodiment of the present invention. In the drawing, reference numerals 1a and 1b denote first reception signal input terminals, 2a and 2b denote first high-frequency amplifiers, 4a and 4b denote power combiners, 6a and 6b are second reception signal input terminals, 7a and 7b are second high-frequency amplifiers, 11
a and 11b are gain control circuits; 16a and 16b are first intermediate frequency amplifiers; 17a and 17b are first reception signal output terminals; 21a and 21b are second intermediate frequency amplifiers;
22b is a second reception signal output terminal. 24 is a first oscillation circuit, 25 is a second oscillation circuit, 26 is a first power divider, 27 is a pulse modulation circuit, 28 is a second power divider, 29 is a third bandpass filter, 30 is a third frequency mixer, 31 is a third high-frequency amplifier, 32 is a transmission signal output terminal, 33 is a frequency multiplier, 50a and 50b are first
, 52a and 52b are second local signal input terminals, 60 and 61 are fourth and third power distributors, 63
a and 63b are first frequency mixers, 64a and 64b are first bandpass filters, 65a and 65b are second frequency mixers, 66a and 66b are second bandpass filters, 67a and 6b.
7b is a high-frequency switch, 71a and 71b are first high-frequency delay devices, 72a and 72b are control circuits, 73a and 73b are second high-frequency delay devices, and 74a and 74b are reception systems.

Next, the operation will be described. The signal of the frequency fco generated by the first oscillation circuit 24 passes through the first power divider 26, is pulse-modulated by the pulse modulator 27, and is then modulated by the third frequency mixer 30 by the second oscillation circuit 25. The signal of the generated frequency fst is frequency-mixed with one of the two signals divided by the second power divider 28, and only the component whose frequency is the sum of fst and fco is extracted by the third bandpass filter 29. Amplifying to an appropriate level by the amplifier 31 and outputting the amplified signal from the transmission signal output terminal 32 to the antenna is the same as in the first embodiment. Further, the other signal divided into two by the first power divider 26 is frequency-multiplied by the frequency multiplier 33 to be a clock signal of the direct digital synthesizer 69, and the direct digital synthesizer 69 converts the signal of the frequency fout Generated and the signal is split into two by the third power splitter 61.
The signals are supplied to the second local signal input terminals 52a and 52b, respectively, and the other signal distributed by the second power distributor 28 is distributed by the fourth power distributor 60 into two signals.
The supply to the first local signal input terminals 50a and 50b is the same as in the third embodiment.

On the other hand, the received signals of this radar apparatus received by two different antennas are input to first and second received signal input terminals 1a and 6a, respectively. At this time,
The frequency of the reception signal is equal to the signal frequency of the transmission signal output terminal 32 and is expressed by Equation 1. After these two received signals are respectively amplified by the first high-frequency amplifier 2a and the second high-frequency amplifier 7a, the output of the first high-frequency amplifier 2a remains unchanged, and the output of the second high-frequency amplifier 7a is After being time-delayed by the first high-frequency delay device 71a, they are respectively input to the power combiner 4a. At this time, the delay time of the first high-frequency delay device 71a is equal to half the pulse repetition time of the radar device. Therefore,
The output signal of the power combiner 4a is a signal input to the first reception signal input terminal 1a in the first half from immediately after transmission of this radar system to the next transmission, and the second half is a second reception signal input terminal in the second half. 6a. Thereafter, these signals are frequency-mixed with the signal from the first local signal input terminal 50a by the first frequency mixer 63a. From the output of the first frequency mixer 63a, the high-frequency switch 6
The operation up to 7a is the same as in the third embodiment.

The switching operation of the high frequency switch 67a is repeated by a signal from the control circuit 72a. During the first half from immediately after the transmission of this radar system to the next transmission, the input signal is transmitted to the second high frequency delay unit 73a. connection,
The latter half is connected to the second intermediate frequency amplifier 21a. The input signal of the first intermediate frequency amplifier 16a is time-delayed by the second high-frequency delay unit 73a. At this time, the delay time of the second high-frequency delay device 73a is equal to the delay time of the first high-frequency delay device 71a. Therefore, signals are output from the first reception signal output terminal 17a and the second reception signal output terminal 22a to the signal processing device of the radar device at the same timing. FIG. 10 shows the temporal operation of each unit described so far. As described above, the first reception signal input terminal 1a and the second reception signal input terminal 6a to the first reception signal output terminal 17a and the first reception signal output terminal 22a. There is a second receiving system 74b having the same configuration as the receiving system 74a, and the second receiving system 74b converts and amplifies signals received from the two antennas into a second intermediate frequency in the same manner as the first receiving system 74a. Then, the signal is output to the signal processing device of the radar device. Note that FIG.
Shows a configuration of a radar excitation receiver in a radar apparatus having four antennas. A radar apparatus having five or more antennas is configured by increasing the number of reception systems.

[0051]

According to the first aspect of the present invention, the radar excitation receiver uses two direct digital synthesizers to generate
Type of first local oscillation signal and two types of corresponding second
A local oscillation signal is generated, and these signals are supplied to a receiving system. The signals received from the two antennas are input to one receiving system, and the first intermediate frequency is generated using different first local oscillation signals. After the two signals are further power-combined, unnecessary signals are removed and gain control is performed to divide the signals into two, and each is converted to a second intermediate frequency using another second local oscillation signal. Since the signals are removed and output to the signal processing device as received signals from the two antennas, respectively, the signals received from the two antennas can be processed by one receiving system. The number of antennas is half that of the number of antennas, so that there is an effect that a radar excitation receiver having a small size, a small weight and low power consumption can be obtained. Furthermore, there is an effect that the number of parts is reduced and an inexpensive radar excitation receiver can be obtained.

According to the second invention, the radar excitation receiver is provided by using two direct digital synthesizers.
In addition, by operating the oscillation frequency of one direct digital synthesizer so that it always switches to two values at high speed, first and second local oscillation signals that always switch to two frequencies at high speed are created. Is supplied to the receiving system, and the first local oscillation signal is separated into two by the first diplexer in the receiving system, and the second local oscillation signal is separated into two by the second diplexer in the receiving system. Receiving signals from two antennas into one receiving system, converting each signal to a first intermediate frequency using the first local oscillation signal, and further power-synthesizing the two signals; Unnecessary wave removal and gain control are performed to divide the signal into two, converted to the second intermediate frequency using the above-mentioned second local oscillation signal, unnecessary wave is removed, and then received signals from two antennas are obtained. Since the signals are output to the signal processing device, the reception signals from the two antennas can be processed by one reception system. Therefore, the number of the reception systems of the radar excitation receiver is half of the number of the antennas. There is an effect that a radar excitation receiver having a small weight and low power consumption can be obtained. Furthermore, there is an effect that the number of parts is reduced and an inexpensive radar excitation receiver can be obtained.

According to the third aspect of the present invention, the radar excitation receiver inputs signals received from two antennas to one receiving system, and one of the signals is always transmitted at a high speed by the first high frequency switch. Switch to and select the selected signal,
The signal is converted to the first intermediate frequency, the unnecessary wave is removed, the gain is controlled, and the signal is converted to the second intermediate frequency.
Since the signals received from the two antennas are selectively separated and separated into the signals received from the two antennas, unnecessary waves are removed, and the signals are output to the signal processing device as the signals received from the two antennas, respectively. Can be processed by the system,
The number of receiving systems of the radar excitation receiver is half of the number of antennas, which has the effect of obtaining a radar excitation receiver that is small in size and weight and consumes little power. Furthermore, there is an effect that the number of parts is reduced and an inexpensive radar excitation receiver can be obtained.

According to the fourth invention, the radar excitation receiver inputs the signals received from the two antennas to one receiving system and amplifies them, and then only receives the signals received from one antenna to the first. After a time delay with a high-frequency delay device,
The two signals are power-combined, then converted to a first intermediate frequency, unwanted wave removal, gain control is performed, and converted to a second intermediate frequency,
The signal of the second intermediate frequency is selectively separated into reception signals from the two antennas by a second high-frequency switch synchronized with the first high-frequency switch, and the time delay is not performed after removing unnecessary waves. Since only the received signal is time-delayed by the second high-frequency delay device and is output to the signal processing device as the received signal from each of the two antennas,
Since the signals received from two antennas can be processed by one receiving system, the number of receiving systems of the radar excitation receiver is half of the number of antennas, thereby reducing the size, weight and power consumption of the radar excitation receiver. There is an effect that can be obtained. Furthermore, there is an effect that the number of parts is reduced and an inexpensive radar excitation receiver can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating frequency characteristics of a bandpass filter.

FIG. 3 is a diagram illustrating frequency characteristics of a bandpass filter.

FIG. 4 is a diagram illustrating frequency characteristics of a bandpass filter.

FIG. 5 is a diagram showing a radar excitation receiver according to a second embodiment of the present invention.

FIG. 6 is a diagram showing signal timing of each unit.

FIG. 7 is a diagram showing a radar excitation receiver according to a third embodiment of the present invention.

FIG. 8 is a diagram showing signal timing of each unit.

FIG. 9 is a diagram showing a fourth embodiment of a radar excitation receiver according to the present invention.

FIG. 10 is a diagram showing signal timing of each unit.

FIG. 11 is a diagram showing a conventional excitation receiver.

[Explanation of symbols]

1a Received signal input terminal, 1b Received signal input terminal, 1
c reception signal input terminal, 1d reception signal input terminal, 2a
High frequency amplifier, 2b high frequency amplifier, 2c high frequency amplifier, 2d high frequency amplifier, 3a local signal input terminal,
3b local signal input terminal, 4a power combiner, 4b power combiner, 5a frequency mixer, 5b frequency mixer,
6a reception signal input terminal, 6b reception signal input terminal, 7
a high frequency amplifier, 7b high frequency amplifier, 8a local signal input terminal, 8b local signal input terminal, 9a frequency mixer, 9b frequency mixer, 10a band filter,
0b bandpass filter, 11a gain control circuit, 11b gain control circuit, 11c gain control circuit, 11d gain control circuit, 12a power divider, 12b power divider, 13
a local signal input terminal, 13b local signal input terminal, 1
4a Band filter, 14b Band filter, 15a
Frequency mixer, 15b Frequency mixer, 16a Intermediate frequency amplifier, 16b Intermediate frequency amplifier, 16c Intermediate frequency amplifier, 16d Intermediate frequency amplifier, 17a Reception signal output terminal, 17b Reception signal output terminal, 17c Reception signal output terminal, 17d Reception signal output terminal , 18a local signal input terminal, 18b local signal input terminal, 19a band filter, 19b band filter, 20a frequency mixer, 20b frequency mixer, 21a intermediate frequency amplifier,
21b intermediate frequency amplifier, 22a reception signal output terminal,
22b reception signal output terminal, 23a reception system, 23b
Receiving system, 24 oscillation circuit, 25 oscillation circuit, 26 power divider, 27 pulse modulation circuit, 28 power divider, 29
Bandpass filter, 30 frequency mixer, 31 high frequency amplifier, 32 transmission signal output terminal, 33 frequency multiplier, 3
4 Direct digital synthesizer, 35 direct digital synthesizer, 36 direct digital synthesizer, 37 band filter, 38 frequency mixer, 39 power divider, 40 power divider, 41 power divider, 42 band filter, 43 frequency mixer, 4
4 band filter, 45 frequency mixer, 46 power divider, 47 power divider, 48 power divider, 49 power divider, 50a local signal input terminal, 50b local signal input terminal, 50c local signal input terminal, 50c local signal input terminal, 50d local signal input Terminal, 51a diplexer, 51b diplexer, 52a local signal input terminal, 52b local signal input terminal, 52c local signal input terminal, 52d local signal input terminal, 53a diplexer, 53b diplexer, 54a receiving system, 54b receiving system, 55 direct digital synthesizer , 56 control circuit, 57 power divider, 58 bandpass filter, 59 frequency mixer, 6
0 power divider, 61 power divider, 62a high frequency switch, 62b high frequency switch, 63a frequency mixer, 63b frequency mixer, 64a band filter, 6
4b Bandpass filter, 65a Frequency mixer, 65b
Frequency mixer, 66a band filter, 66b band filter, 67a high frequency switch, 67b high frequency switch, 68a control circuit, 68b control circuit, 69a reception system, 69b reception system, 70 direct digital synthesizer, 71a high frequency delay device, 71b high frequency delay device, 72a control circuit, 72b control circuit, 73a high-frequency delay device, 73b high-frequency delay device, 74a reception system, 7
4b reception system, 75a frequency mixer, 75b frequency mixer, 75c frequency mixer, 75d frequency mixer, 76a band filter, 76b band filter, 7
6c band filter, 76d band filter, 77a
Frequency mixer, 77b Frequency mixer, 77c Frequency mixer, 77d Frequency mixer, 78a Band filter,
78b band filter, 78c band filter, 78d
Bandpass filter, 79a receiving system, 79b receiving system, 7
9c receiving system, 79d receiving system, 80 power divider, 8
1 Power divider.

Claims (4)

[Claims] 1. A first reception signal input terminal, a first high-frequency amplifier connected to the first reception signal input terminal, an output terminal of the first high-frequency amplifier, a first local signal input terminal, and a first A first frequency mixer, a second received signal input terminal connected to one input terminal of the first power combiner, a second high-frequency amplifier connected to the second received signal input terminal, A second frequency mixer connected to the output terminal of the second high-frequency amplifier, the second local signal input terminal, and the other input terminal of the first power combiner; A first bandpass filter connected thereto, a gain control circuit connected to an output end of the first bandpass filter, a first power divider connected to an output end of the gain control circuit, and a first power distribution Output terminal on one side of the vessel and the third
A third frequency mixer connected to the local signal input terminal of the second bandpass filter and an input terminal of the second bandpass filter, a first intermediate frequency amplifier connected to the output terminal of the second bandpass filter,
A first reception signal output terminal connected to an output terminal of the first intermediate frequency amplifier, another output terminal of the first power divider, a fourth local signal input terminal, and a third bandpass filter; A fourth frequency mixer connected to the input end, a second intermediate frequency amplifier connected to the output end of the third bandpass filter, and a second intermediate frequency amplifier connected to the output end of the second intermediate frequency amplifier. A first reception system having a reception signal output terminal, a second reception system having the same structure as the first reception system, first and second oscillation circuits, and an output terminal of the first oscillation circuit , A pulse modulation circuit connected to one output terminal of the second power divider, and a third power connected to the output terminal of the second oscillation circuit. Divider, one output terminal of the third power divider and the pulse modulation circuit. A fifth frequency mixer connected to the input end of the fourth bandpass filter, a third high frequency amplifier connected to the output end of the fourth bandpass filter, and a fifth high frequency amplifier connected to the output end of the fourth bandpass filter. A transmission signal output terminal connected to an output terminal; a frequency multiplier connected to another output terminal of the second power divider; and first and second terminals connected to output terminals of the frequency multiplier. , A third direct digital synthesizer, and a sixth terminal connected to an output terminal of the first direct digital synthesizer, another output terminal of the third power divider, and an input terminal of a fifth bandpass filter. A frequency mixer, a fourth power divider connected to the output end of the fifth bandpass filter, a fifth power divider connected to the output end of the second direct digital synthesizer, and of A sixth power divider connected to an output terminal of the direct digital synthesizer, one output terminal of the fifth power divider, one output terminal of the fourth power divider, and an input of a sixth bandpass filter; And a seventh frequency mixer connected to the other end, respectively, to one output terminal of the sixth power divider, the other output terminal of the fourth power divider, and the input terminal of the seventh bandpass filter. An eighth frequency mixer to be connected, an input terminal connected to an output terminal of the sixth bandpass filter, and an output terminal connected to a first local signal input terminal of each of the first and second receiving systems. An eighth input terminal connected to the output terminal of the seventh bandpass filter, and an output terminal connected to the second local signal input terminal of the first and second receiving systems. A power divider and the other output end of the fifth power divider And an output terminal connected to a third local signal input terminal of each of the first and second receiving systems.
And an input terminal at the other output terminal of the sixth power distributor, and a fourth terminal of each of the first and second receiving systems.
A radar excitation receiver, comprising: a tenth power splitter having an output terminal connected to a local signal input terminal of the radar device. 2. A first receiving signal input terminal, a first high-frequency amplifier connected to the first receiving signal input terminal, an input to the first local signal input terminal, and an input to the first local signal input terminal. A first diplexer having one end connected thereto, a first frequency mixer connected to an output end of the first high-frequency amplifier, one output end of the diplexer, and one input end of the power combiner, and a second reception end. A signal input terminal, a second high-frequency amplifier connected to the second reception signal input terminal, an output terminal of the second high-frequency amplifier, another output terminal of the diplexer, and another input terminal of the power combiner. , A first bandpass filter connected to the output end of the power combiner, a gain control circuit connected to the output end of the first bandpass filter, Connect to output end A first power divider, a second local signal input terminal, a second diplexer having an input terminal connected to the second local signal input terminal, and one output terminal of the first power divider. , A third diplexer connected to one output terminal of the second diplexer and an input terminal of the second bandpass filter.
Frequency mixer, the other output terminal of the first power splitter, the other output terminal of the second diplexer, and the third
A fourth frequency mixer connected to the input terminal of the band-pass filter, and a first frequency mixer connected to the output terminal of the second band-pass filter.
An intermediate frequency amplifier, a first reception signal output terminal connected to the output terminal of the first intermediate frequency amplifier, a second intermediate frequency amplifier connected to the output terminal of the third bandpass filter,
A first reception system having a second reception signal output terminal connected to an output terminal of the second intermediate frequency amplifier;
A second receiving system having the same structure as that of the first and second receiving systems;
An oscillation circuit, a second power divider connected to the output terminal of the first oscillation circuit, a pulse modulation circuit connected to one output terminal of the second power divider, A third power divider connected to the output terminal of the oscillator circuit of the first embodiment, one output terminal of the third power divider, the output terminal of the pulse modulation circuit, and the input terminal of the fourth bandpass filter. A fifth frequency mixer to be connected, a third high-frequency amplifier connected to the output terminal of the fourth bandpass filter, a transmission signal output terminal connected to the output terminal of the third high-frequency amplifier, A frequency multiplier connected to another output terminal of the second power divider; first and second direct digital synthesizers connected to the output terminal of the frequency multiplier; and a second direct digital synthesizer. Connected second director A control circuit for a digital synthesizer, the first output terminal of the direct digital synthesizer and the other output terminal of the third power divider 5
A sixth frequency mixer connected to the input terminal of the bandpass filter, a fourth power divider connected to the output terminal of the second direct digital synthesizer, and one of the fourth power dividers A seventh frequency mixer connected to the output end, the output end of the fifth bandpass filter, and the input end of the sixth bandpass filter; and the input end to the output end of the sixth bandpass filter, And a fifth power divider connected to the first local signal input terminal of the second receiving system, and a fifth power divider connected to the input terminal to the other output terminal of the fourth power divider, respectively. A radar excitation receiver comprising: a sixth power divider whose output terminals are respectively connected to second local signal input terminals of first and second receiving systems. 3. A first reception signal input terminal, a first high-frequency amplifier connected to the first reception signal input terminal, and a second reception signal input terminal.
A second high-frequency amplifier connected to the received signal input terminal of the first and second high-frequency amplifiers, a first high-frequency switch connecting two input terminals to output terminals of the first and second high-frequency amplifiers, A first frequency mixer connected to an output terminal of the first high-frequency switch, a first local signal input terminal, and an input terminal of the first bandpass filter, respectively connected to an output terminal of the first bandpass filter; Gain control circuit, an output terminal of the gain control circuit, a second local signal input terminal, and a second
Connected to the input terminals of the bandpass filters of
Frequency mixer, a second high-frequency switch having an input terminal connected to the output terminal of the second bandpass filter, a first intermediate frequency amplifier connected to one output terminal of the second high-frequency switch, A first reception signal output terminal connected to the output terminal of the first intermediate frequency amplifier, a second intermediate frequency amplifier connected to the other output terminal of the second high-frequency switch, and the second intermediate frequency amplifier A first reception system having a second reception signal output terminal connected to the output terminal of the first switch, a switch control circuit connected to the control signal input terminals of the first and second high-frequency switches, and the first reception system. A second receiving system having the same structure as the receiving system, first and second oscillation circuits, a first power divider connected to an output terminal of the first oscillation circuit, Pulse connected to one output terminal of distributor Adjusting circuit, a second power divider connected to the output terminal of the second oscillation circuit, one output terminal of the second power divider, the output terminal of the pulse modulator, and a third band. A third frequency mixer connected to the input terminal of the filter, a third high-frequency amplifier connected to the output terminal of the third bandpass filter, and a transmission connected to the output terminal of the third high-frequency amplifier A signal output terminal;
A frequency multiplier connected to another output terminal of the power divider, a direct digital synthesizer connected to an output terminal of the frequency multiplier, and an input terminal connected to an output terminal of the direct digital synthesizer. And a third power divider having an output terminal connected to each of the second local signal input terminals of the second receiving system, and an input terminal to the other output terminal of the second power divider. The first and second
And a fourth power divider having an output terminal connected to the first local signal input terminal of each of the receiving systems. 4. A first reception signal input terminal, a first high-frequency amplifier connected to the first reception signal input terminal, a second high-frequency amplifier,
Receiving signal input terminal, a second high-frequency amplifier connected to the second receiving signal input terminal, a first high-frequency delay device connected to an output terminal of the second high-frequency amplifier, and the first high-frequency amplifier A power combiner for connecting one input terminal to the output terminal of the power combiner and the other input terminal to the output terminal of the first high-frequency delay device; an output terminal of the power combiner and a first local signal input terminal; A first frequency mixer connected to an input terminal of the first bandpass filter, a gain control circuit connected to an output terminal of the first bandpass filter, an output terminal of the gain control circuit, and a second local signal input A second frequency mixer connected to the terminal and an input terminal of the second bandpass filter, a high-frequency switch having an input terminal connected to the output terminal of the second bandpass filter, and a high-frequency switch connected to one output terminal of the high-frequency switch. Connected A second high-frequency delay device, a first intermediate frequency amplifier connected to an output terminal of the second high-frequency delay device, a first reception signal output terminal connected to an output terminal of the first intermediate frequency amplifier, A second intermediate frequency amplifier connected to the other output terminal of the high frequency switch,
A second reception signal output terminal connected to the output terminal of the intermediate frequency amplifier, and a control circuit of the high frequency switch connected to a control signal input terminal of the high frequency switch.
, A second receiving system having the same structure as the first receiving system, first and second oscillation circuits, and a first power distribution circuit connected to an output terminal of the first oscillation circuit. Vessel and the first
A pulse modulation circuit connected to one output terminal of the power divider, a second power divider connected to the output terminal of the second oscillation circuit, and one output terminal of the second power divider A third frequency mixer connected to an output terminal of the pulse modulator and an input terminal of a third bandpass filter, a third high-frequency amplifier connected to an output terminal of the third bandpass filter, A transmission signal output terminal connected to the output terminal of the third high-frequency amplifier; a frequency multiplier connected to another output terminal of the first power divider; and a frequency multiplier connected to the output terminal of the frequency multiplier A direct digital synthesizer, and a third power distribution unit having an input terminal connected to an output terminal of the direct digital synthesizer and an output terminal connected to a second local signal input terminal of each of the first and second receiving systems. Vessel and the second A fourth power divider having an input terminal connected to the other output terminal of the force divider and an output terminal connected to the first local signal input terminal of each of the first and second receiving systems. Radar excitation receiver.