JPH0235386A - Radar apparatus - Google Patents

Abstract

PURPOSE:To conduct beam scanning matched with the purpose of use by making it possible to specify the number of hits and the period of the beam scanning freely for each area according to various conditions. CONSTITUTION:An operator specifies the form of compression of a pulse, the form of a signal processing and the period of beam scanning for each small area from an operation panel 420. A system control computer 500 delivers a beam scanning control signal 501 to a cylindrical active phased array antenna 100, a pulse compression form selection signal 502 to a pulse expander 210 and a pulse compressor 220, and a signal processing form selection signal to a signal processing device 300, and conducts an operational control of an entire radar system. Receiving a transmission IF signal 151 from the expander 210 and the scanning control signal 501, the antenna 100 emits a transmission beam and outputs a reception IF signal 152 to the compressor 220. A compression IF signal 225 of the compressor 220 is converted into a video signal 250 and processed by the processing device 300.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a radar device, and particularly to a two-dimensional electronically scanned face array radar that can irradiate a beam in any direction in three-dimensional space at any time.

(Background of the Invention) Defense radars are required to scan the entire search space in a shorter time due to improvements in high-speed flight capabilities and high turning capabilities of aircraft, guided flying vehicles, and the like. On the other hand, due to the adoption of microwave-absorbing materials and shapes that avoid microwave reflection, the reflection cross-section of aircraft and guided flying objects to be captured continues to decrease, and in order to cope with this, radars are becoming more sophisticated. It is being forced to emit energy and many transmitted pulses.

(Problem to be solved by the invention) However, shortening the scan time and increasing the number of transmitted pulses per specific direction (hereinafter referred to as the number of hits) are mutually exclusive requirements, and as used in air traffic control, Since the beam scanning angular velocity of a mechanical rotary radar is constant, trying to shorten the scanning time will result in a hit.
This will lead to a decrease in the number of people and it will be impossible to meet the demand.

There is also a phased array radar that performs so-called two-dimensional electronic scanning in the azimuth and elevation directions, but in this case as well, as long as the planar array is mechanically rotated, it is possible to control the beam scanning angular velocity to some extent; Due to the constraints of

The object of the present invention is to use a polygonal phase l-array or a cylindrical face l-array that can emit a beam in any direction in three-dimensional space at any time, and to
By providing rake operators with a means to freely specify the number of beams, beam scanning period, etc. for each region according to the various conditions described in ``Radio Wave Environment Conditions and Rake Operation Purposes'', beams that meet the operational purposes can be created. The aim is to provide a radar that enables scanning.

(Means for Solving the Problems) The radar device of the present invention has the following means configuration to achieve the above object.

That is, the radar device of the present invention pairs an antenna capable of electronically forming a transmitting/receiving beam in any direction in three-dimensional space at any time using a beam scanning control signal, a transmitting pulse width, and a compressed pulse width. Built-in multiple pulse compression formats, one of which is selected according to an external pulse compression type B selection signal.
A receiver capable of selecting one of two pulse compression formats in real time: Select one of a plurality of pre-programmed signal processing formats in response to an external signal processing format selection signal.
a signal processor capable of selecting two signal processing formats in real time; a region setting means for dividing a radar search space into a plurality of regions according to topographical conditions, weather conditions, and radar operational conditions; processing designation means for allocating an appropriate one of the pulse compression mode and signal processing mode to be applied to the region; and a beam scanning period for beam scanning within the region for each of the divided regions; Beam scanning/transmission upon receiving settings and specified specifications from a beam scanning specifying means for specifying a relative number based on the cycle of any one area, the area setting means, the processing specifying means, and the beam scanning specifying means. a system controller that creates a sequence control program and sends a beam scanning control signal, a pulse compression mode selection signal, and a signal processing mode selection control signal to the antenna, receiver, and signal processor, respectively; It is something to do.

(Example) Hereinafter, an example of the radar device of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the rake device of the present invention. In Fig. 1, 100 has a cylindrical shape, and a transmission power of 1 to 1 is connected to one of the antenna elements.
200 is a receiving device, 300 is a signal processing device, 400 is a command and control device, and 500 is a system control computer. Also, the receiving device 2
00, 210 is a pulse stretcher, 220 is a pulse compressor, 230 is a detector, and in the command and control device 400, 410 is a display, and 420 is an operation panel.

The operation of the present invention will be explained with reference to FIG.

First, the operator sets the area from the operation panel 420 according to topographic conditions, weather conditions, radio wave environment conditions, and radar operation conditions, and divides the entire search direction area into a plurality of small areas.

FIG. 2 shows an example of setting the area. Next, the operator specifies the pulse compression mode and signal processing mode to be implemented in each small region from the operation panel 420 by selecting one from the menus that have been incorporated in advance at the design stage,
Further, for each region, the period for scanning the region with the beam is specified by a ratio.

Table 1 G shows an example of such a specification.

Table 1 shows an example set up based on the following intent.

(1) A long transmission pulse width (expanded pulse width) is selected because the longer the distance, the more power is required.

(2) Since the closer the target is, the more accurate position measurement is required, a shorter compression pulse width is selected.

(3) At short distances, there is a large power graph caused by ground surface reflection.
Since surface cracks exist, the closer the distance, the more the pulse 1 to tsuppura processing is performed to achieve a large improvement in the signal to clutter power ratio.

(4) A shorter beam scanning period is assigned to a threat target at a shorter distance because the threat level is higher, the azimuth position changes more greatly per unit time, and highly accurate tracking performance is required.

(5) Short compressed pulse width, multi-hit pulse Doppler processing, and similar beam scanning period are assigned to the priority search airspace (area D).

Upon receiving the operator designation information 450 from the operation panel 420, the system control computer 500 first calculates the beam scanning time required to scan each region once, and then performs the beam scanning specified for each region. The entire beam scanning program is edited according to the period (ratio), the beam scanning period for each area is calculated, and the beam scanning program information 504 is sent to the display 410. Table 2 shows an example of the beam scanning period for each area calculated in this way. The operator checks the beam scanning program displayed on the display 410, makes corrections from the operation panel 420 as necessary in Table 2, and finalizes the beam scanning program.

The system control computer 500 sends beam scanning control signals 5 to the cylindrical active face array antenna 100 in real time according to the determined beam scanning program.
01, pulse stretcher 210 and pulse compressor 220
A pulse compression mode selection signal 502 is sent to the signal processing device 300, and a signal processing mode selection signal 503 is sent to the signal processing device 300, respectively, to control the operation of the entire Rake system.

The pulse stretcher 210 receives the pulse compression format signal 502 from the system control computer 500, selects one that generates a specified expanded pulse width from among a plurality of pre-installed pulse expansion devices in real time, and transmits the transmitted IP multiplication signal 51.
Output. The cylindrical active phased array antenna 100 receives a transmission IP multiplication signal 51 and a beam scanning control signal 501, forms a transmission beam in a specified direction in real time, and radiates microwave energy with a specified pulse width.

At the same time, the signal received by the beam formed in the designated direction is demodulated and a reception IF signal 152 is output.

The pulse compressor 220 receives a pulse compression format signal 502 input in synchronization with the pulse stretcher 210, and selects in real time one of a plurality of pre-installed pulse compression devices that generates a specified compressed pulse width. Compressed IP
A double signal 25 is output. The detector 230 receives the pressure mIF signal 2
25 and performs predetermined detection to generate a video signal 250.

The signal processing device 300 inputs the video signal 250 and the signal processing mode selection signal 503 at mutually synchronized timing, selects in real time a specified processing mode from among a plurality of signal processing modes programmed in advance at the design stage, and processes the video signal. The signal 250 is processed.

In order to realize such processing, a signal processing processor whose processing function can be changed by firmware is used as a signal processing arithmetic element, and multiple signal processing forms (for example, 4-Hi1-MTl processing, 8-Hit 1-MTl processing, Hit I ~ pulse Doppler processing, 16 hit pulse Doppler processing) are included as a program and can be selected in real time. The final processed output signal is displayed on the display 410 in this manner.

(Effects of the Invention) As explained above, according to the radar device of the present invention,
It is not limited to the conventional operation mode (beam scanning program) that is pre-installed at the design stage, but it is also capable of beam scanning, transmission pulse assignment, and transmission pulse assignment that adapt to changes in radio wave environment conditions and aircraft flight conditions within the target search airspace. There is an advantage that the beam scanning period corresponding to the machine rotation period can be programmed and executed as desired by the radar operator.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a radar device according to the present invention, and FIG. 2 is a diagram showing an example of area setting in the device according to the embodiment of the present invention. 100... Cylindrical active face 1-array antenna, 200... Receiving device, 210...
music/pulse stretcher, 220...pulse compressor, 230...detector, 300...signal processing device, 400...command and control device, 410...
Display, 420... Operation panel, 500...
・System control computer. Agent Patent Attorney Yoshihiro Hachiman

Claims (1)

[Claims] It has a built-in antenna that can electronically form a transmitting and receiving beam in any direction in three-dimensional space at any time using a beam scanning control signal; and a plurality of pulse compression modes that pair the transmitted pulse width with the compressed pulse width. A receiver capable of selecting one of the pulse compression formats in real time in response to an external pulse compression format selection signal; a signal processor capable of selecting one of the signal processing formats in real time according to the conditions; and an area setting means for dividing the radar search space into a plurality of areas according to topographical conditions, weather conditions, and radar operational conditions. ; processing designation means for allocating an appropriate one of the pulse compression mode and signal processing mode to be applied to each of the divided regions; and a beam scanning period for beam scanning within the region for each of the divided regions. beam scanning designation means for designating by a relative number based on the period of any one of the divided regions;
A beam scanning/transmission sequence control program is created by receiving settings and specified specifications from the area setting means, the processing specifying means, and the beam scanning specifying means, and beam scanning control is performed for the antenna, receiver, and signal processor, respectively. 1. A radar device comprising: a system controller that transmits a signal, a pulse compression mode selection signal, and a signal processing mode selection control signal.