JPS61264276A - Multifunction radar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A multi-function radar equipped with a radar function and a communication function, which is configured by attaching an audio modulation means to the radar transmitting section and an audio demodulating means to the radar receiving section. By switching the device, it is possible to use the radar function to measure distance, direction, etc., and the communication function to communicate with the other party's radar.

[Industrial application field]

The present invention relates to a multi-function radar that has both a radar function for measuring distance, direction, etc., and a communication function for communicating with the other party.

Generally, a radar station is equipped with a radar to measure its own position and the position of a target object, and a radio transmitter/receiver for communication9 calls, and uses the radar to measure distance and direction. In addition to knowing the location of a target object, it also exchanges information with a specific partner using a wireless transceiver.

When communicating confidential information using a general wireless transceiver, there is a risk that the communication will be intercepted by a third party other than the other party. Furthermore, depending on the frequency band used by the wireless device, antenna radiation conditions, etc., radio wave propagation may deteriorate, resulting in a short range of radio waves, making communication difficult.

On the other hand, if the transmission output is increased to extend the communication distance, the transmitter will inevitably become larger, so a large installation space cannot be obtained in a ship or a portable radar station, making it difficult to increase the transmission output.

To this end, the multi-function radar of the present invention adds a communication function to the radar and uses the radar's microwave band frequency and the directional characteristics of the radar antenna to improve radio wave propagation characteristics and increase the communication distance. At the same time, the communication is kept confidential.

[Conventional technology]

FIG. 2 shows a schematic diagram of a conventional radar station.

The radar station is equipped with a radar 1 for knowing its own position and the position of a target object, and a transceiver 3 for communicating with a transceiver 2 of a specific partner station.

As is well known, radar 1 has a radar frequency (
For example, 9 to 13 GHz) is modulated with a pulse signal of a predetermined repetition period, and is emitted to the outside as a radar signal from a transmitter via a directional antenna such as a parabolic antenna.

This emitted radar signal is reflected by the target object, becomes a reflected signal, and is received by the receiver of radar 1. The distance and direction of the target object are measured based on the time from transmission to reception and the reception direction of the antenna. From the results, we know the location of the target object and our own location.

On the other hand, for example, ships and the like exchange information with consort ships while monitoring the ocean area using radar.

In this information exchange, the transmitter/receiver 3 communicates with the transmitter/receiver 2 of the partner station. As the communication frequency of the above-mentioned transceiver, a communication frequency band is used.

[Problem that the invention seeks to solve]

Since this conventional communication method uses a communication frequency band, there is a risk that a third party may eavesdrop on the content of communication with a specific partner station. Furthermore, depending on the frequency band used, antenna setting conditions, etc., radio wave propagation may deteriorate, resulting in short communication distances and communication difficulties.

On the other hand, if an attempt is made to increase the transmission output in order to ensure the communication distance, the transmitter will inevitably become larger, which poses a problem of installation space in ships and mobile radar stations.

The present invention was created in view of these points.
Adds a communication function to radar with a simple configuration, uses the radar's microwaves and the directional characteristics of the radar antenna, improves radio wave propagation characteristics, extends communication distance, and provides confidentiality of calls. The purpose is to provide a multi-function radar.

[Means for solving problems]

FIG. 1 shows a block diagram of a multifunction radar according to the present invention.

In FIG. 1, a voltage controlled oscillator 7 that oscillates a CW multiplied signal of the radar frequency by an applied voltage output from an applied voltage generation circuit 8, an output CW multiplied signal of the voltage controlled oscillator 7,
It is equipped with a transmitting section 9 consisting of a PiN diode switch 91 that modulates with a radar signal having a pulse width having a predetermined repetition output from a pulse width and repetition period generating circuit 92, and a power amplifying section 93 that amplifies the radar signal. a radar transmitter,
a modulation voltage generation circuit 5 that generates a voltage corresponding to the audio output voltage level of the microphone 4 in the radar transmitter and FM modulates the oscillation frequency of the voltage controlled oscillator 7 with the generated voltage;
When the transmitter is in radar function, the output of the applied voltage generation circuit 8 is
A first switch 6 is added for switching the output of the modulated voltage generating circuit 5 to be applied to the voltage controlled oscillator 7 during the communication function.

On the other hand, the radar receiver includes a mixer section 12-1 that converts reflected waves and radio waves from the other party into an intermediate frequency, and a local oscillator 12-1 that inputs a local signal for the mixer section 12-1 to create an intermediate frequency signal. 2, and a frequency discriminator 14-1 that detects an intermediate frequency signal.
and a sample and hold circuit 14-2 that samples and holds the output detection signal of the frequency discriminator 14-1,
An AF that controls the oscillation frequency of the local oscillator 12-2 according to the amount of deviation of the output voltage of the sample-and-hold circuit 14-2 from a predetermined value, and controls the intermediate frequency to be kept constant.
C circuit 14.

A voltage that changes manually and automatically is generated in this radar receiver, and the generated voltage is applied to the local oscillator 12-2 to change the local frequency of the local oscillator 12-2 and synchronize it with the input receiving frequency. When the frequency control circuit 15 is active, the output voltage of the frequency control circuit 15 is applied to the local oscillator 12-2 when the radar transmitter functions as a communication function, and the output voltage of the sample hold circuit 14-2 is applied to the local oscillator 12-2 when the radar transmitter functions as a radar. A second switching device 16 is added to perform the switching.

In addition, for transmitting and receiving radar radio waves, an antenna 11 with directional characteristics, a circulator 10-1 and a diode limiter 10- of a transmitting/receiving switching unit 10 that separates transmitting and receiving radio waves are used.
2 is used.

[Effect]

The radar transmitter is provided with both a radar function and a communication function, and the functions are switched by switching the first and second switching devices 6 and 16.

That is, in the transmitter, by switching the first switch, during the communication function, the voltage generated by the modulation voltage ordering circuit 5 is applied to the voltage controlled oscillator 7, and the radar frequency is FM modulated by sound and transmitted. In the receiver, by switching the second switch 16, the voltage of the frequency control circuit 15 whose output voltage changes manually during the communication function is changed to local oscillation B.
12-2 and adjusts the local oscillation frequency to tune it to the receiving frequency, making it possible to talk to the other party.

When the transmitter and the receiver are in radar function, the first switch 6 and the second switch 6, 16 are switched so that the output voltage of the applied voltage generation circuit 8 and the sample hold circuit 14-
The output voltage of 2 is applied to the voltage controlled oscillator 7 and the local oscillation B 12-2, which generate microwaves, respectively, and the frequency is set, so that the radar operates as a normal radar.

〔Example〕

As shown in the block diagram of FIG. 1, the multifunction radar of the present invention has both a radar function and a communication function.

In the block diagram of FIG. 1, during the radar function, the transmitter includes an applied voltage generation circuit 8 and a voltage controlled oscillation circuit (V
CO) 7, a PtN diode switch 91, a pulse width/repetition period generating circuit 92, and a transmitter 9 consisting of a power amplifier 93.
2, intermediate frequency amplification circuit 13, and frequency discriminator 14-1
AFC consisting of sample and hold circuit 4-2
It is composed of a circuit 14.

On the other hand, during the communication function, the transmitter uses a modulation voltage generation circuit 5 that generates a voltage corresponding to the audio output level of the microphone 4 and a first switch 6 instead of the applied voltage generation circuit 8 during the radar function. It is added. The receiver also includes a frequency control circuit 15 that generates a voltage that changes manually or automatically, and applies the generated voltage to the local oscillator 12-2 to change the local frequency and control it to be in tune with the input reception frequency. , and a second switch 516 for switching between the output voltage of the frequency control circuit 15 and the output voltage of the sample and hold circuit 14-2.

As is already well known, the radar function operates by switching the first selector switch 6 and applying voltage to the applied voltage generating circuit 8.
The output voltage of is applied to the VCO 7, and the VCO 7 generates a signal CW times the radar frequency.

The CW multiplied signal is converted by the PtN diode switch 91 into a pulse signal with a predetermined pulse width and period output from the pulse width and repetition period generation circuit 92, and then sent from the power amplification section 93 to the transmission/reception switching section 10 and the radar antenna 1.
1 to the outside.

The radio waves transmitted to the outside are reflected by the target object and input again to the mixer section 12-1 of the receiver via the radar antenna 11 and the circulator 10, and are then input to the mixer section 12-1 of the receiver.
An intermediate frequency is created by mixing with the output frequency of .

Further, the intermediate frequency input to the frequency discriminator 14-1 becomes a video signal having error information with respect to its center, and the video output signal sampled and held by the sample-and-hold circuit 14-2 passes through the second switch 16. The vCo drive circuit 12-3 generates a drive voltage, and the local oscillator 12
-2 to control the frequency, the output intermediate frequency of the mixer section 12-1 is automatically controlled to be always constant.

As shown in FIG. 2, the operation during the communication function is based on the fact that the other party is also equipped with a multifunction radar with the same communication function.

As shown in the signal waveform diagram of FIG. 3, the microphone 4 of FIG.
The audio output is input to the modulation voltage generation circuit 5, which generates a voltage corresponding to the audio level, and passes through the first switch 6 to the VC.
The FM modulated wave is inputted to O7 and has a frequency corresponding to the audio level as shown in FIG. 3B. This FM modulated wave generates an FM modulated pulse signal as shown in FIG. 3C by the PiN diode switch 91, and is transmitted from the radar antenna 11 to the other station.

As shown in FIG. 2, the radar antenna 11 of the own station and the radar antenna 18 of the other station are stopped at positions facing opposite directions. FM modulated signals at a radar frequency transmitted from a partner station are mutually received by radar antennas 11 and 18 and input to a receiver.

The received signal input to the mixer section 12 is tuned by manually or automatically changing the output voltage of the frequency control circuit 15.

The tuned intermediate frequency signal (see Figure 3) is detected by the frequency discriminator 14-1 (Figure 3E), and sampled and bolded by the sample-and-hold circuit 14-2 as shown in Figure 3F. The resulting signal is processed by the audio filter 21 to remove high frequency components at the sampling point (FIG. 3G), and then reproduced as audio by the speaker 20.

In this way, by transmitting and receiving data using radar antennas with microwave band radar frequencies and opposing directivity, radio wave propagation is improved, and eavesdropping by third parties can be prevented due to the antenna's directional characteristics.

〔Effect of the invention〕

As explained above, according to the present invention, both the radar function and the communication function are provided, and especially in the communication function, the radio wave propagation is improved, the communication distance is increased, and eavesdropping by a third party can be prevented.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the multi-function radar of the present invention, Fig. 2 is an equipment diagram of the multi-function radar of the present invention, Fig. 3 is a signal waveform diagram during communication function of the multi-function radar of the present invention, and Fig. 4 is a diagram of the multi-function radar of the present invention. Equipment diagram of a conventional radar station. In the figure, 1 is the radar, 2 is the transmitter/receiver of the other station, 3 is the transmitter/receiver of the own station, 4 is the microphone, 5 is the modulated voltage generation circuit,
6 is a first switch, 7 is a voltage controlled oscillator, 8 is an applied voltage generation circuit, 9 is a transmitter, 91 is a PiN diode switch, 92 is a pulse width and repetition period generation circuit, 93 is a power amplifier, and 10 is a transmission/reception circuit. Switching unit, 10-1 is a circulator, 10-2 is a limiter diode, 11 is a radar antenna, 12 is a mixer circuit, 12-1 is a mixer unit, 12-2
is a local oscillator, 12-3 is a vCO drive circuit, 1
3 is an intermediate frequency amplifier circuit, 14 is an AFC circuit, 14-1 is a frequency discriminator, 14-2 is a sample and hold circuit, 15
16 is a frequency control circuit, 16 is a second switch, 17 is a display unit, 18 is a radar antenna on the other side, 19 is a speaker, 2
0 is detection. Amplification and processing circuits, and 21 indicate audio filters, respectively.

Claims (1)

[Claims] A voltage controlled oscillator (7) to which a voltage is applied to oscillate a radar band CW signal, an applied voltage generating circuit (8) which generates the applied voltage, and a modulated voltage generating circuit (5) which outputs a modulated voltage by audio output. ), a first switching switch (6) for switching the output voltages of both the generating circuits, and a transmitter (9) for converting the CW signal into a radar pulse signal and transmitting the radar pulse signal.
On the other hand, a mixer circuit (12) that receives a radar signal and converts it into an intermediate frequency signal, an AFC circuit (14) that controls the output frequency of the mixer circuit to be kept constant, and a mixer circuit (14) that controls the output frequency of the mixer circuit to keep it constant; a frequency control circuit (15) that controls the output frequency of the circuit to a predetermined frequency;
A multi-function radar comprising: a receiving section including the frequency control circuit and a second switch (16) for switching the output control voltage of the AFC circuit.