JPH054066U - Radar equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a radar device having a receiver capable of suppressing near-field noise of a reference frequency signal sent from a transmitter through a transmission line. [Structure] A reference frequency signal transmitted from a transmitter 1 to a receiver 2 via a transmission line is suppressed by a SAW frequency reactor 14 and a crystal filter 15 to suppress the noise of the signal, and then a signal is combined by a combiner 16. Then, the receiver is provided with the frequency filter unit 17 for sending to the multiplier B12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a radar device used for, for example, target detection or tracking of a ship or an aircraft.

[0002]

[Prior Art]

 FIG. 2 shows the configuration of a conventional radar device. Reference numeral 1 is a transmitter, 2 is a receiver, 3 is a reference signal generator including a plurality of reference signal generators, and 4 is a reference signal from the reference signal generator 3. Frequency switcher for switching signals temporally, 5 is a multiplier for transmitting signal A, 6 is a high frequency pulse generator, and 7 is a signal from the multiplier for transmitting signal A5 and a signal from the high frequency pulse generator 6 are mixed. Mixer A, 8 is an amplifier for amplifying required transmission power, 9 is a transmission / reception switching circuit, 10 is an antenna section, 11 is a broadband frequency reactor for noise suppression provided in an input section of a reference signal from a transmitter, Reference numeral 12 is a multiplier B that multiplies the reference signal that has passed through the broadband frequency wave reactor 11 into a receiving station originating signal, and 13 is a mixture of the receiving signal from the antenna unit 10 and the receiving station originating signal from the multiplier B12, and an intermediate frequency It is a mixer B that generates a signal.

In the configuration as shown in FIG. 2, one of the plurality of reference signals generated by the reference signal generator 3 in the transmitter 1 is arbitrarily selected by the frequency switch 4 and is multiplied by the multiplier A5. The generated signal is mixed with the pulse from the high frequency pulse generator 6 by the mixer 7, amplified by the amplifier 8, and then sent to the antenna unit 10 to be radiated. On the other hand, the received signal input from the antenna unit 10 is mixed in the broadband frequency reactor 11 with the noise-suppressed signal multiplied by the local oscillator signal in the mixer B13 and converted into an intermediate frequency signal, which is then converted into a radar video signal. It is sent to the signal processing unit.

[0004]

[Problems to be solved by the device]

 In the conventional radar device configured and operating as described above, the noise from the outside is superimposed on the reference frequency signal sent from the transmitter to the receiver via the transmission line, and the frequency furnace that suppresses the noise. Since the wave filter has a wide band through which all the reference frequency signals can pass, it is inevitable that the local noise after the multiplier B is increased, because the neighborhood noise of the reference frequency signal cannot be suppressed.

The present invention has been made in order to solve the above problems, and by providing a frequency filter unit in the receiver, a noise signal superimposed on a reference frequency signal is suppressed and a local oscillator after multiplication is generated. It suppresses the noise signal of the frequency signal.

[0006]

[Means for Solving the Problems]

 The radar device according to the present invention is a simple frequency reactor that operates on each frequency of a SAW frequency reactor wave or the like in order to suppress the noise superimposed on the reference frequency signal in the receiver. The wave filter and the crystal filter, which is a narrow band filter centering on each frequency of the plurality of reference signals of the reference signal generator 3, are provided.

[0007]

[Action]

 The radar device according to the present invention is configured so that the neighboring noise of each reference frequency signal, which is superposed when it is sent from the transmitter to the receiver, is generated by the SAW frequency reactor operating for each frequency and each of the plurality of reference frequency signals. By providing a plurality of narrow-band filters such as crystal filters centering on the frequency of, it is possible to suppress the noise of the arbitrarily selected signal frequency.

[0008]

【Example】

 Example 1. FIG. 1 is a diagram showing the configuration of an embodiment of a radar device according to the present invention. In FIG. 1, 1 to 10, 12 and 13 are the same as those in the prior art, 14 is a SAW frequency wave reactor, 15 is a crystal filter, 16 is a combiner, and 17 is a frequency filter section.

In the above-described structure, the reference frequency signal arbitrarily selected by the frequency switch 4 is input to the receiver 2 and then sent to the frequency filter unit 17 to operate at each frequency. The frequency reactor 14 and the crystal filter 15 which is a narrow band filter suppress the near noise of the signal, and the combiner 16 combines the signals and outputs them to the multiplier B13.

[0010]

[Effect of the device]

 The present invention is configured as described above, and can suppress the noise that is superimposed when it is sent from the transmitter to the receiver to the noise in the vicinity thereof, so that the noise signal of the local oscillator frequency signal after multiplication can be sufficiently suppressed. The effect is that you can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a radar device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a conventional radar device.

[Explanation of symbols]

 1 transmitter 2 receiver 3 reference signal generator 4 frequency switcher 5 multiplier A 6 high frequency pulse generator 7 mixer A 8 amplifier 9 transmission / reception switching circuit 10 antenna unit 11 wideband frequency converter 12 multiplier B 13 mixer B 14 SAW frequency reactor 15 Crystal filter 16 Combiner 17 Frequency filter

Claims (1)

Claims for utility model registration 1. A radar device for searching or tracking a target, comprising a transmitter for outputting a reference frequency signal and a high frequency power pulse, and a frequency filter section for wave-forming the reference frequency signal. A radar device having a receiver for frequency-converting a received signal, a transmission / reception switching circuit for switching between a transmission signal and a reception signal, and an antenna section.