JPS5866074A - Radar system - Google Patents

Abstract

PURPOSE:To reduce the loss of transmission power with a rise in the data updating rate by receiving reflected radio waves of radio waves having different polarized waves orthogonal to each other which were emitted simultaneously from two antennas. CONSTITUTION:A high frequency power generated from a transmitter 18 is divided into two parts with a power distributor 17, which are sent simultaneously to antennas A11 and A12 via separate circulators 14 and 15. With the antenna A11, the divided power is converted into a horizontally polarized wave and a radio wave is emitted into the space while with the antenna B12, a radio wave is emitted. The reflected signals of the radio wave as horizontally polarized wave emitted from the antenna A11 are received with the antenna A11. Likewise, the reflected signals of the radio wave as vertically polarized wave emitted from the antenna B12 are received with the antenna B12. Thus, the radio waves emitted from the separate antennas are received independently and transmitted to receivers 13 and 16 via the circulators 14 and 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radar device, and more particularly to a transmission/reception system for a radar device that uses two antennas to obtain target information.

Conventionally, this type of radar device is configured as shown in FIG. The high frequency power generated by the transmitting device 4 is sent to the LP switch 3 via the circulator 5, and is distributed to the two antennas 1.2 in one time division. The transmission timing is shown in FIG. In the figure, a indicates the transmission section of the antenna Af), bH the transmission section of the antenna B, and C indicates the switching section exchange rate of the kLF switch. On the other hand, the reflected signals received by the antennas A and B are sent to the receiving device 6 via the RF switch 3 and the circulator 5t-.

However, since the method described above uses two antennas in a time-sharing manner, (1) the idle period of one of the antennas is long, making it unsuitable for tracking radars and the like that require a high data update rate.

■ Since all the high frequency power during the switching time of the RF switch becomes a loss, 10011% of the transmitter output power is not utilized.

There are two drawbacks mentioned above.

The present invention solves the above drawbacks by simultaneously emitting two spatially orthogonal radio waves with different polarizations from each antenna, thereby creating a radar system with low loss and high data update rate.
1tt is provided.

That is, in the present invention, in a radar device that uses two antennas to extract information such as the position and speed of a target, radio waves are simultaneously emitted from the two antennas at the same frequency, and two
In order to prevent mutual interference between the two antennas, two spatially orthogonal radio waves with different polarizations are emitted from each antenna, and the reflected radio waves are received.

Next, an embodiment of the present invention will be described with reference to FIG. The high frequency power generated by the transmitting device &18 is divided into two by the power divider 17, and each is divided into two by the circulator 14. I
It is simultaneously sent to the air @A, Bll and 12 to FI. For example, if the antenna All converts the radio waves into horizontally polarized waves and radiates the radio waves into space, the antenna B12 emits vertically polarized radio waves. By selecting the polarization in this way, mutual interference between airborne 1i1A11 and B12 is reduced,
It becomes possible to emit radio waves from two antennas simultaneously.

That is, the reflected signal due to the horizontally polarized radio waves radiated from the antenna All is received by the antenna All, and is dangerous to be received by the vertically polarized antenna B12.

Similarly, a reflected signal due to a vertically polarized radio wave radiated from the air @B is received by the air 41B, but not by the horizontally polarized antenna A. In this way, the radio waves emitted from each antenna are received independently, and the radio waves are received by each circulator of 14.15 tons.
- and then sent to the receiving device 13.16.

In this way, it is possible to extract independent information from the two antennas simultaneously.

As explained above, the present invention is designed to configure a radar device that simultaneously emits radio waves with different polarizations orthogonal to each other from two antennas. Therefore, information can be obtained continuously from the two antennas (there is no down period), and the data update rate increases.

■ Since there is no switching time due to an RF switch, there is no transmission power loss.

The above two effects can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a device configuration according to the prior art, FIG. 2 is a transmission timing diagram of the device according to the prior art, and FIG. 3 is a diagram showing an example of the device configuration according to an embodiment of the present invention. 1, 2. 11. 12...Aerial line, 3...
...RF switch, 4,18... Transmitter,
5,14.15...Circulator%6,16
- Mountain: Receiving device, 17... Power divider. −4(

Claims (1)

[Claims] A one-type radar that is characterized by emitting two radio waves of the same frequency but with different spatially orthogonal polarizations from one antenna, and receiving the reflected radio waves with the corresponding antenna.