JPS5810705B2 - dotsupura sensor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a Doppler sensor.

Conventional Doppler sensors continuously radiate transmission signals, so if noise or interference waves are present,
There was a risk that a beat would occur and cause subsequent circuits to malfunction.

The present invention seeks to provide a Doppler sensor that eliminates the above-mentioned drawbacks.

Hereinafter, the present invention will be explained with reference to the drawings.

In the figure, 1 is a first gate circuit whose driving end is connected to one output end Q of the unstable multi-by-break 2.

Reference numeral 3 denotes an oscillator, which is connected to the input terminal of the first gate circuit 1.

Reference numeral 4 denotes a transmitting antenna, which is connected to the first gate circuit 1 via an amplifier 5.

A receiving antenna 6 receives a signal transmitted from the transmitting antenna 4 and reflected by the object 7.

Reference numeral 8 denotes a mixer, one of whose input ends is connected to the receiver and the receiving antenna 6 via 9, and the other end is connected to the oscillator 3.
is connected to the output end of the

10 is a second gate circuit, the driving end of which is connected to one output end Q of the unstable multi-by-break 2, and the input end thereof being connected to the output end of the mixer 8 via a beat amplifier 11. ing.

Reference numeral 12 designates a third gate circuit, whose driving ends are connected to the other output ends of the unstable multi-by-break 2 and whose input ends are connected to the output end of the beat amplifier 11.

A fourth gate circuit 13 operates in the opposite manner to the first to third gate circuits, and its driving end is connected to the output end of the third gate circuit 12 via a monostable multivib break 14. The input end is connected to the output end of the second gate circuit 10, and the output end is connected to a subsequent circuit.

Reference numeral 15 denotes a countermeasure processing circuit, which is connected to the output terminal of the flip-flop 14.

Thus, the first gate circuit 1 is opened and closed by one output of the unstable multi-by-break 2, and the output of the oscillator 3 is intermittently transmitted, so that the receiver 9 can continuously receive the output via the receiving antenna 6. The system maintains the current state and monitors within a predetermined area.

If there is no object 7 within the predetermined area and no noise or interference waves, the receiver 9 will not receive any signal.

Therefore, only the output signal of the oscillator 3 is inputted to the mixer 8, and as a result, the mixer 8 does not provide an output to subsequent circuits.

That is, there are no outputs from the second to fourth gate circuits 10, 12, 13, and the detector 15 detects that no noise or interference waves are present.

If there is no object 7 within the predetermined area and there is generally continuous noise or interference, the receiver 9 receives the noise or interference signal via the receiving antenna 6 and provides it to the mixer 8 .

In the mixer 8, the noise or interference wave signal and the output signal of the oscillator 3 are mixed, and the beat amplifier 11
via the second. It is applied to the third gate circuit 10.12.

Second. The third gate circuits 10 and 12 are alternately opened by the output of the unstable multi-by-break 2, and since the output signal of the beat amplifier 11 is generally continuous, the second and third gate circuits 10 and 12 are The 12 outputs appear alternately.

A fourth gate circuit 13 that transmits the output of the second gate circuit 10 to a subsequent circuit causes a monostable multi-by break 14 to perform an unstable multi-by break for a predetermined period of time, for example, if the output signal of the third gate circuit 12 is present. The fourth gate circuit 13 does not transmit the output signal of the second gate circuit 10 to the subsequent circuit, and is in the open state if no output signal is present. This prevents subsequent circuits from operating.

When noise or interference waves are present, the countermeasure processing circuit 15
Predetermined processing, such as switching the frequency of the oscillator 3, is performed.

If the object 7 exists within the predetermined area and no noise or interference waves exist, the receiver 9 receives the signal reflected by the object 7 via the receiving antenna 6 and provides it to the mixer 8 .

In the mixer 8, the reflected wave signal and the output of the oscillator 3 are mixed, and the reflected wave signal is mixed with the output of the oscillator 3. It is applied to the third gate circuit 10°12.

Second. The third gate circuits 10 and 12 are alternately opened by the output of the unstable multi-by-break 2, and the output signal of the beat amplifier 11 is connected to the second gate circuit 1.
Since it exists only in the open state of 0, the output signal of the second gate circuit 10 exists, and the output signal of the third gate circuit 12 does not exist.

Therefore, the fourth gate circuit 13 is always open and provides the output signal of the second gate circuit 10 to the subsequent circuit.

The countermeasure processing circuit 15 does not operate because there is no noise or interference waves.

If the object T exists within the predetermined area and generally continuous noise or interference waves exist, the receiver 9 receives the reflected wave signal from the object 7 and the noise or interference wave signal via the receiving antenna 6. , feed to mixer 8.

In the mixer 8, the reflected wave signal, noise or interference wave is mixed with the output of the oscillator 3, and the mixed signal is applied to the second and third gate circuits 10 and 12 via the beat amplifier 11.

The second and third gate circuits 10.12 are alternately opened by the output of the unstable multi-by-break 2, and since the output signal of the beat amplifier 11 is generally continuous, the second and third gate circuits 10.12 The outputs of gate circuits 10.12 appear alternately.

A fourth gate circuit 13 that transmits the output of the second gate circuit 10 to a subsequent circuit operates as a monostable multi-bi break 14 if the output signal of the third gate circuit 12 is present.
Therefore, the fourth gate circuit 13 is closed for a predetermined period of time, for example, one cycle of the output of the unstable multi-by-break 2, and is open if no output signal exists.
The output signal of the gate circuit 10 is not transmitted to the subsequent circuit, so that the subsequent circuit is not operated.

The countermeasure processing circuit 15 detects the presence of noise or interference waves and performs predetermined processing, such as switching the frequency of the oscillator 3.

In the present invention, malfunctions due to reception of noise or interference waves are prevented by switching the oscillation frequency of the oscillator 3 to several types, but if desired, the malfunctions can be prevented by adjusting the reception sensitivity of the receiver 9. may be achieved.

As is clear from the above, in the Doppler sensor of the present invention, if noise or interference waves are present, the fourth gate circuit 13 does not operate the subsequent circuit regardless of the presence or absence of the object 7. This has the effect of preventing malfunctions caused by reception of noise or interference waves.

[Brief explanation of drawings]

The figure shows an embodiment of the invention. 1.10,12,13...Gate circuit, 2...Unstable multi-vibration break, 3...Oscillator, 4...Transmission antenna, 5...Amplifier, 6...Receiving antenna, 7...Object , 8
Tsu...mixer, 9...receiver, 11...beat amplifier, 1
4... Monostable multi-bi break, 15... Countermeasure processing circuit.

Claims (1)

[Claims] 1 Connect one output end of the unstable multi-by-break to the first and second
the other output end is connected to the drive end of a third gate circuit, and the output end of an oscillator that generates a signal via the first gate circuit is connected to a transmitting antenna; The output terminal of the oscillator is connected to one input terminal of a mixer, and the receiving antenna is connected to the second and third antennas via the mixer.
The output terminal of the second gate circuit is connected to the input terminal of the gate circuit, and the output terminal of the second gate circuit is connected to the subsequent circuit via a fourth gate circuit that opens and closes in the opposite manner to the opening and closing operations of the first to third gate circuits. and connect the output end of the third gate circuit to the drive end of the fourth gate circuit via a monostable multi-by break having a holding time of one cycle or more of the output of the astable multi-by break. A Dotsupura sensor that is characterized by: