JPH04106488A - Radar apparatus - Google Patents

Abstract

PURPOSE:To enable accurate detection of a target by giving a phase difference between transmitting and receiving outputs of a transmitter of a radar device having a plurality of transmitters to prevent interference with other transmitter/ receivers from individual transmitters. CONSTITUTION:An transmitting output of a crystal oscillator 8 is inputted into a clock input of a counter 9 and after the division of frequency thereof, it is inputted into a one-shot multivibrator 10 which generates one pulse at the rising of an input signal and into a one-shot multivibrator 11 which generates one pulse at the falling of the input signal. An output of the one-shot multivibrator 10 acts as a transmitting trigger for an A channel at a transmitting section via a buffer circuit 12 and an output of the one-shot multivibrator 11 acts as transmitting trigger for a B channel at a transmitting section via a buffer circuit 13. Thus, the B channel trigger 19 is delayed by T/2 from the A channel trigger 17. Especially, when a detection distance of a radar device is below T/4, there is no mutual interference from neither the A nor B channel thereby achieving higher detection accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radar device having a plurality of transmitting devices.

[Conventional technology]

Radar has its origin (Radio Detection)
and Ranging), as is clear from
A wireless device that emits radio waves and uses the reflected waves to determine the presence of a target and the distance (location) to it.

Currently, such radar devices require precision and are prone to failure. On the other hand, radar must be able to be used continuously.

Therefore, a laser device was devised that has two or more transmitting device parts, so that when a failure occurs, the other transmitting device is immediately put into operation, thereby reducing the period of outage.

FIG. 4 is a diagram showing the configuration of a conventional radar device with a dual transmitting/receiving device equipped with a trigger generation circuit that generates an A channel transmission trigger and a B channel transmission trigger simultaneously, and FIG. 6 shows the conventional radar device in an operating state. It is a figure which shows the time chart in . In FIG. 4, 1 is a trigger generation circuit, 2 is a transmitter, 3 is a circulator, 4 is a waveguide switch, 5 is a high power dummy, 6 is an antenna, and 7 is a receiver. In Fig. 6, 17 is the A channel transmission trigger;
8 is the A channel received video, 19 is the B channel transmission trigger, and 20 is the B channel received video.

Next, the operation will be explained. Trigger generation circuit 1 in Figure 4
As shown in FIG.
is transmitted simultaneously on A channel and B channel. The transmitter 2 generates high frequency high power in synchronization with the trigger. Therefore, high frequency high power is generated simultaneously in the A channel and the B channel. The generated high frequency high power passes through the circulator 3 and is guided to the waveguide switch 4.

If it is currently being operated on channel A, the high frequency high power generated on channel A is guided by the antenna and radiated into the air, and the high frequency high power generated on channel B is mostly converted into heat by a high power dummy. However, at the same time, some of it is radiated into the air from the antenna as leakage power. The radiation due to such leakage power is considered to be the radiation from the A channel,
After colliding with an object, the reflected wave is received by the antenna 6 again, passes through the waveguide switch 4 and the circulator 3, and is converted into a video by the receiver 7.

[Problem to be solved by the invention]

Conventional radar equipment that has two or more transmitters is configured as described above, so the high frequency generated by one transmitter may interfere with the transmission or reception of the other, resulting in a decrease in detection accuracy. There was a problem.

[Means to solve the problem]

This invention was made in order to solve the above problems, and provides a phase difference between a plurality of transmission outputs.

[Effect]

As described above, since there is a phase difference between the plurality of transmission outputs, they are transmitted and received without interfering with each other.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a radar device according to an embodiment of the present invention,
FIG. 5 is a time chart. In FIG. 1, 1 is a tri-force generating circuit according to the present invention, 2 is a transmitter, 3 is a circulator, 4 is a waveguide switch, 5 is a high power dummy 6
7 is an antenna, 7 is a receiving section, 8 is a crystal oscillator that determines the transmission frequency, 9 is a frequency counter, 10 and 11 are one-shots, and 12 and 13 are buffer circuits. Further, in FIG. 5, 17 is an A channel transmission trigger, 18 is an A channel reception video, 19 is a B channel transmission trigger, 20 is a B channel reception video, and 21 is a frequency division counter output.

The following operation will be explained.

In Fig. 1, the oscillation output of the crystal oscillator 8 is input to the clock input of the counter 9, and after being frequency-divided, one shot 10 generates one pulse at the rising edge of the human input signal, and one pulse is generated at the falling edge of the input signal. The one-shot 11 is manually inputted into a pulse having a pulse width τ and a reversal period T. The output of the one shot 10 passes through a buffer circuit 12 and becomes a transmission trigger for the transmitter A channel transmission trigger, and the output of the one shot 11 passes through a buffer circuit 13 and becomes a transmission trigger for the transmitter B channel. Therefore, as shown in FIG. 5, the B channel transmission trigger 19 lags the A channel transmission trigger 17 by T/2. In particular, when the detection distance of the radar device is T/4 or less, the detection accuracy can be improved without interfering with either the A channel or the B channel.

In the above embodiment, the transmission trigger is generated by the rise and fall of the counter output, but independent comparators may be provided in the counter output section for the H channel and the B channel, and an example of this is shown in FIG. .

In FIG. 2, 14 is a comparator, 15 is a delay time setting switch, and 16 is a modified trigger generation circuit. With this configuration, it is possible to freely set the phase difference between the A channel transmission trigger and the B channel transmission trigger,
This is particularly effective in a radar device having three or more transmitting devices.

FIG. 3 shows another embodiment in which a plurality of antennas are used depending on the transmitting device in order to reduce blind spots when detecting targets in complex terrain. Here, the trigger generation circuit is the same as the modified trigger generation circuit 16 shown in FIG. In a radar device having a configuration including a plurality of antennas as described above, there is a problem in that the high frequency high power radiated from one transmitting device interferes with the transmission or reception of the other. Conventionally, a method of controlling the direction of the antenna was used to solve this problem.
Particularly when the number of antennas increases, the control mechanism becomes complicated and the detection efficiency decreases. Therefore, by applying the present invention, the above problems are solved, the transmission from one radar device is prevented from interfering with the transmission or reception of the other, the detection granularity is increased, and the direction of the antenna is prevented from interfering with the transmission or reception of the other device. None 1. Eliminates the need for control.

By the way, although the above invention has been described with respect to a radar device having two transmitting devices, it goes without saying that it can also be used in a radar device having two or more transmitting devices.

In short, any modifications are allowed as long as they do not depart from the spirit of the invention.

〔Effect of the invention〕

As described above, according to the present invention, a phase difference is provided between the transmission outputs of the transmitting devices of a radar device having a plurality of transmitting devices, thereby preventing each transmitting device from interfering with other transmitting/receiving devices. It is possible to detect targets with high granularity.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a trigger force generation circuit and two transmitting devices of a dual radar device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a trigger device according to another embodiment of the present invention. A generation circuit diagram, FIG. 3 is a diagram showing the configuration of a radar device having two antennas according to another example of diversion of the radar device of the present invention, and FIG. 4 is a diagram showing the configuration of a radar device having two conventional transmitting/receiving devices. 5 is a diagram showing a time chart according to an embodiment of the present invention, and FIG. 6 is a diagram showing a time chart in a conventional operating state. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A radar device having a plurality of transmitting devices, characterized in that a phase difference is provided between the transmission outputs of the transmitting devices.