JPH0527012A - Radar device - Google Patents

Abstract

PURPOSE:To improve operational efficiency by performing reception while no pulse transmission is made from a transmitter, investigating the radio wave environment, and controlling the channels to be used of the transmitter and the receiver on the basis of the investigation. CONSTITUTION:The radio wave monitoring is performed when no transmission pulse is transmitted at a transmitting site. The radio waves of total channels are received over a wide range by taking advantage of the characteristics of a transmitting/receiving antenna 7 according to the specified timing to monitor the radio wave environment, and the radio wave monitoring is performed by means of a radio wave environment monitoring device 5 through a circulator 6. The device 5 realizes the measurement and analysis of the condition of use of the channels and the level of noises or the like, selects the optimum channel on the real time basis, and transmits the information to a transmitter 1 and a receiver 3. Thereafter, the transmitter 1 realizes transmission through the channel according to the information and the receiver 3 realizes reception of the echo through the channel according to the information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar device, and more particularly to a bistatic radar device in which a receiver is arranged at a distance from a transmitter and each has a separate antenna.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing the structure of a conventional bistatic radar device. The transmitting site of the device is composed of a transmitting antenna 2 and a transmitter 1, and the receiving site is a receiving antenna 4 and a receiver. 3 and 3. As described above, in the bistatic radar, the transmitter and the receiver are arranged at a distance, and each has its own antenna. With this configuration, it is possible to improve the radio wave isolation characteristics in the radar device of the type that constantly outputs radio waves in the narrow H band or the like.

Next, the operation will be described. The transmission pulse generated by the transmitter 1 at the transmission site shown in FIG. 3A is transmitted from the wideband transmission antenna 2 as a wide-angle beam. Then
This transmitted pulse is reflected by a target (not shown), and its echo is input to the receiver 3 via the receiving antenna 4 at the receiving site in FIG. 3 (b), and the target signal is detected.
4 (a) is a timing chart of the transmission pulse generated by the transmitter 1, and FIG. 4 (b) is a reception timing chart of the receiver 3. As can be seen from this figure, while the receiving site receives the transmitting pulse, the function of the transmitting site is stopped and the transmitting pulse is not emitted.

[0004]

Since the conventional radar device is constructed as described above, when performing pulse transmission, the function on the transmitting site side is stopped while receiving on the receiving site side. , The characteristics of the transmitting antenna that transmits a wide-angle beam in a wide band have not been fully utilized. Also,
When the apparatus is operated by selecting the optimum channel with less noise from a large number of channels, there is a problem that it is necessary to separately dispose an antenna and a receiver for monitoring the radio environment.

The present invention has been made in order to solve the above problems, and the characteristics of a transmitting antenna can be fully utilized, and an antenna for monitoring the radio wave environment and a receiving device are not separately arranged. An object of the present invention is to obtain a radar device capable of channel selection.

[0006]

A radar device according to the present invention is provided with a radio wave environment monitoring device on a transmission site side, receives a pulse from a transmitter during a period in which pulse transmission is not performed, and investigates a radio wave environment. Based on the result, the used channels of the transmitter and the receiver are controlled.

[0007]

According to the present invention, a radio wave environment monitoring device is provided on the transmitting site side, and the radio wave environment is investigated by receiving signals during the period when pulse transmission is not being performed from the transmitter. Since the used channel is controlled, the transmitting antenna can be shared as a receiving antenna for monitoring the radio wave environment, and there is no need to separately arrange a radio wave environment monitoring device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a bistatic radar device according to an embodiment of the present invention. The same reference numerals as those in FIG. 3 denote the same or corresponding parts, and 5 is a radio wave environment monitoring device for monitoring the radio wave environment at the time of reception. Yes, 6 is a circulator for switching transmission / reception at the transmission site, and 7 is a transmission / reception shared antenna.

Next, the operation will be described with reference to FIG. The transmission site composed of the transmitter 1, the radio wave environment monitoring device 5, the circulator 6, and the transmission / reception shared antenna 7 is
At the time of transmission, the transmission pulse is transmitted as a wide-angle beam from the transmission / reception shared antenna 7 through the circulator 6 at the timing of the transmission pulse as shown in FIG. On the other hand, at the receiving site, an echo from a target (not shown) is input to the receiver 3 via the receiving antenna 4 in the same manner as in the conventional case, and the target signal is detected.

When the transmission pulse is not transmitted at the transmitting site, the radio wave environment is monitored. That is, FIG. 2 (a)
In accordance with the timing for monitoring the radio wave environment, the characteristics of the shared antenna 7 are used to receive the radio waves of all channels over a wide area, and the radio wave environment monitoring device 5 monitors the radio wave environment via the circulator 6. Then, the radio wave environment monitoring device 5 measures the usage status of the channel, the level of noise, and the like, analyzes it, selects the optimum channel in real time, and transmits this information to the transmitter 1 and the receiver 3. Then, the transmitter 1 thereafter transmits on the channel according to the information, and the receiver 3 also receives the echo on the channel according to the information.

As described above, according to the present embodiment, the radio wave environment monitoring device 5 is provided at the transmission site, and reception is performed at the timing when the transmitter 1 is not transmitting, and the channel usage status and noise level are checked. If you measure and select the optimal channel based on the result and perform transmission and reception, it is not necessary to separately arrange a radio environment monitoring device other than the transmission site and the reception site, and the transmission operation of the transmission site stops. Since the reception is performed at the same timing, the transmission antenna can be shared as the reception antenna of the radio wave environment monitoring device 5, the usage efficiency is improved, and the characteristics of the wideband transmission antenna can be fully utilized.

[0012]

As described above, according to the radar device of the present invention, the radio wave environment monitoring device is provided at the transmission site, and the radio wave environment is analyzed by receiving the radio wave using the transmission signal during the period when the radio wave is not being transmitted. Since the optimum channel is selected and transmitted / received based on the result, the operation efficiency of the device is improved, and a high-performance radar device can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of a radar device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining transmission / reception timing of the radar device according to the embodiment of the present invention.

FIG. 3 is a block configuration diagram showing a conventional radar device.

FIG. 4 is a diagram for explaining transmission / reception timing of a conventional radar device.

[Explanation of symbols]

 1 transmitter 2 transmitting antenna 3 receiver 4 receiving antenna 5 radio environment monitoring device 6 circulator 7 transmit / receive antenna

Claims (1)

Claim: What is claimed is: 1. A radar device having a transmitter and a transmitting antenna on the transmitting site side and a receiver and a receiving antenna on the receiving site side, wherein the transmitting site side has radio waves. A radio wave environment monitoring device for investigating the environment should be provided, and the radio wave environment monitoring device should be used for reception at the timing when transmission is not performed, and the output channel of the radio wave environment monitoring device should be used to control the channels used by the transmitter and receiver. A radar device characterized in that