JPS6161076A - Detecting device - Google Patents

Abstract

PURPOSE:To reduce the probability of success in the evasion of a target by providing a passive and an active system and a means which switches and uses both selectively, and displaying the nature of accessibility to a target without suspecting. CONSTITUTION:A system selective switching device 4 allows a passive type unit 1 to operate at the start of operation or when the target 5 is at distance larger than a specific value. When the roughly calculated distance to the target 5 decreases below the specific value, the device 4 switches the unit 1 to an active type unit 2. A signal converting device 2a captures the target 5 by a driving device 2f in tracking mode and its signal is inputted to a signal processor 2e. A transmit signal, on the other hand,is inputted to the processor 2e to calculate the accurate distance to the target 5. Its data is stored as position data to calculate speed data as the difference between position data at different time points and acceleration data as the difference between speed data. Further, the probability of evasion of the target is subtracted for the passive system, which is switched to the active system right before an attack to measure the target precisely, so the probability of a failure in attaching is low.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a detection device, and particularly to a detection device suitable for approaching a target without being detected.

[Background of the invention]

Conventional detection devices use radar (active method) to search a predetermined field of view, and after finding a target, use the radar to narrow the field of view and track and capture the target. Publication [Radar Technology] Publication date S59.1
．． 20)] As a result, when the target was within the effective range of the on-board weapon, it was attacked with the on-board weapon, and was only an active method.

Therefore, there was a high possibility that the target would realize that he or she was being searched or followed from a distance and take evasive action.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a detection device that effectively exhibits the characteristic of the passive method, which allows approaching a target without being detected, and reduces the probability of successfully evading the target.

[Summary of the invention]

The present invention passively captures the radiant energy generated by a target. Focusing on the property of being able to collect information about the target bt without being detected by the target, we
This passive method obtains information on the target's direction and approaches the target while continuing the search.

On the other hand, in order to ensure accuracy in distance measurement during attacks, when a sufficient approach is predicted based on the information acquired by the barrasive method, the detection device is switched from the passive method to the active method and the distance to the target is precisely measured. The target's speed and acceleration are also calculated to predict its future position. Based on the information obtained sequentially from this result, the target can be reliably grasped using the tracking/acquisition mode (see FIG. 3(b)) with a narrower field of view than during the search.

As a result, when the predicted position of the target at the time when the onboard weapon reaches the target is within the range of the onboard weapon, an attack is initiated based on the result of signal processing by the detection device.

Therefore, compared to the conventional method, the time from sensing that a target is being tracked to starting an attack is shorter, and the probability of target evasion is reduced.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIG.

When the detection device 3 starts operating, or when the distance to the target 5 is beyond a predetermined value (for example, several times the effective range of the mounted weapon), the method selection switching device 4 sets the passive method unit 1 to operate. It is becoming. Signal conversion device 1a
The driving device 18 moves a predetermined field of view into a search mode (third
(See Figure (a)).

The signal conversion device 1a grasps energy (eg, electromagnetic waves, infrared rays, etc.) obtained from the field of view directly facing the user, and converts it into a signal (eg, electrical signal) that can be internally processed. The receiving device lb removes noise from this signal using techniques such as amplification, detection, and switching, and then inputs the signal to the received energy processing device IC.

The received energy processing device 1c analyzes the spectral intensity and spectral distribution of the received energy and stores it in the storage device 1! ld
The type of target (whether the enemy is an ally, type, etc.) is determined by comparing it with the database in , and the approximate distance to the target is calculated. This result is displayed on the display 7 in front of the pilot. In addition, when the aircraft equipped with the detection bag W3 is in automatic control mode and there is a target that appears to be an enemy within the search field of view, the aircraft axis will be directed towards the target with the highest spectral intensity within the field of view. controlled by.

Approach the target by repeating the above-mentioned search → target confirmation → target index and approximate distance calculation → control of the aircraft axis toward the target direction.

When the approximate distance to the eye 415 is within a predetermined value (for example, several times the effective firing range of the mounted weapon), the received energy processing device I
Based on the distance information regarding the target from C, the method selection switching device 4 switches from the passive method unit 1 to the active method unit 2.

The signal converter 2a grasps the target 5 in the tracking mode (FIG. 3(b)) by the drive transmitter 2f, and the signal emitted from the receiver 2c passes through the transmit/receive switch 2b and is transferred to the signal converter 12.
It is fired towards target 5 from a. After this signal is emitted, it hits the target, is captured again by the signal converter 2a as a reflected signal, is amplified and detected by the receiver 2d, and is input to the signal processor 2e.

On the other hand, the transmission signal is also input to the signal processing device 2e, and the transmission signal
The distance to the target 5 is accurately determined from the relationship between the signal and the received signal 4. This data is stored as position data. Velocity data is obtained as the difference between position data at two times,
Further, acceleration data is obtained as a difference between the velocity data.

- As an example, considering the application of fire control based on the data of the detection device 3, if the predicted distance to the target at the time when the on-board weapon is predicted to reach the target based on these data is within the effective firing range, the signal processing device One output signal from 2e activates the onboard weapons command device 6.

The detection device 3 is an active method, and when it receives an answerback signal from the related equipment after outputting a predetermined output to the related equipment, the method selection switching device 4 operates and switches to the passive method unit 1 to detect the next target. Start searching.

According to this embodiment, since the passive method allows the vehicle to approach the target sufficiently without being detected, it has the effect of reducing the probability of being avoided by the target. In addition, since the system switches to the active method immediately before an attack and accurately measures the target, it has the effect of obtaining accurate data and, for example, reduces the possibility that the attack will fail.

FIG. 2 shows another embodiment. The feature of this example is that the constituent devices of the passive method and the active method are shared.Specifically, the signal converters 1a and 2a are shared, 3a, the receivers 1b and 2d are shared, 3c is used, and the received energy processing Device I
C and the signal processing device 2e are shared, and the system selection switching device [4 is also included in the system 3e.

When a component device is shared between the passive method and the active method, first, in the passive method, the receiving sensitivity ΔT is as follows: a: Receiver constant Tsys: Receiver system temperature B: Intermediate frequency bandwidth τ1: Integration time (1 ) According to the formula, in the passive method, the wider the intermediate frequency bandwidth B, the higher the reception sensitivity.

On the other hand, in the case of the active method, it has been experimentally found that the detection distance is maximized when the intermediate frequency bandwidth B and pulse width τ are in the following combination.

1.2 8=□ (2) τ2 Generally, the intermediate frequency bandwidth B in equation (1) is several times to a factor of several times as large as the intermediate frequency bandwidth B in equation (2).

Therefore, both the passive method and the active method cannot exhibit their maximum performance in the same intermediate frequency band B due to shared use of devices.

However, in this embodiment, the active method is used after getting sufficiently close to the eye IjI5, and does not require as long a detection distance as the conventional detection device using only the active method.

Moreover, since the optimal intermediate frequency band τ is determined by equation (2), and the fourth power of the detection distance is inversely proportional to the term related to the intermediate frequency bandwidth B, the detection distance is reduced by only about 15% in this example. Therefore, this embodiment can pass the performance as a detection device.

Therefore, the intermediate frequency bandwidth B may be set so as to exhibit the maximum capability in the passive method for this detection device.

According to this embodiment, by sharing each device, it is possible to reduce the size and weight. In addition, the active method has the effect that the transmitted signal does not reach unnecessarily far distances (it is difficult to be detected by enemies other than the target).

In the figure, 2g is a drive device, 3b is a transmission/reception switch, 3d is a transmitter, 3Q1 is a passive signal processing section, 3Q@ is an active signal processing section, 3h is a method selection switch, 3f is a storage device, and 3g is a drive. 8 is a machine axis control device; 9 is a received energy; 10a;

10b is a transmission number and a reception number.

In addition, in recent years, with the improvement of stealth technology (techniques that make it difficult to see by radio waves using structures and paints), aircraft are becoming targets that are difficult to detect with active radar.The passive method of the present invention makes it possible to detect objects that emit energy. Therefore, it is also effective against stealth targets.

The present invention can also be applied to a firearm tube as an application of the detection device.

〔Effect of the invention〕

According to the present invention, it is possible to approach the target without being detected, and after approaching the target, it is possible to accurately measure the target in a short time using an active method.
It can reduce the target's evasion probability and increase the hit probability.

[Brief explanation of drawings]

FIG. 1 is an operation explanation and system configuration diagram of one embodiment of the present invention, and FIG. 2 is a system configuration diagram of another embodiment of the present invention.
FIG. 3(a) is an explanatory diagram of the search mode, and FIG. 3(b) is an explanatory diagram of the tracking mode. DESCRIPTION OF SYMBOLS 1... Passive method unit, 2... Active method unit, 3... Detection device, 4... Method selection switching device, 6... Mounted weapon command device, 7... Display device,
8... Axis control device.

Claims (1)

[Claims] 1. A device that receives energy emitted by a target, a received energy processing device that analyzes this received energy and obtains information regarding the target, and a storage device that stores and references this information. A transmitting device that emits a signal toward the target, a device that receives a reflected signal after this signal collides with the target, and a signal that analyzes this received signal and obtains information about the target. It is characterized by comprising an active method consisting of a processing device and a storage device for storing and referencing this information, and provided with means for selectively switching and using the active method and the passive method. Detection device. 2. In claim 1, there is provided means for using the passive method when the target and the detection device are further than a predetermined distance, and switching to the active method when the distance is within the predetermined distance. A detection device characterized by: 3. In claim 1, the energy receiving device and the reflected signal receiving device are shared among the devices constituting the passive method and the active method, and the received energy processing device and the reflected signal receiving device are shared. A detection device characterized in that it is shared with a signal processing device. 4. The detection device according to claim 1, wherein electromagnetic waves are used as the received energy in the passive method, and electromagnetic waves are also used for the transmitting signal and the receiving signal in the active method.