JPS61124879A - Apparatus for searching and tracking target - Google Patents

Abstract

PURPOSE:To discriminate a real target and a dummy target, by comparing receiving signal characteristic information with receiving signal reference information and changing over a searching mode to a tracking mode when the correlation between both informations enters a predetermined range. CONSTITUTION:A reference value generator 6 sends a reference valve 106 showing the estimated intensity of a receiving signal 103 relating to a preliminarily stored specific target to a comparator 7 which, in turn, compares the reference valve 6 with the receiving signal 103. When the intensity of the receiving signal 103 enters a definite range from the reference valve 106, the comparator 7 sends a change-over signal 107 to a searching/tracking change-over device 10. When the searching/tracking change-over device 10 receives the change-over signal 107, said change-over device 10 blocks a searching signal 109 and supplies an angle error signal 108 to a servo amplifier 11 to change over a searching mode to a tracking mode. By this method, a dummy target and a real target are made easy to discriminate and, therefore, only the real target is made easy to track.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a target search and tracking device that can be mounted on a flying object, and particularly to a target search and tracking device that uses active transmission and reception to track reflected radio waves from a target and guide a flying object to the target. Regarding tracking devices.

(Prior Art) In a conventional target search and tracking device of this type, when the operation mode is in the search mode, the antenna beam is scanned mechanically by a servo mechanism or by electrical phase synthesis, and the received signal is When it exceeded a preset threshold, the received signal was processed as a reflected signal from the target, an angular error signal was generated from the received signal, and the operation mode was switched to tracking mode.

(Problems to be Solved by the Invention) However, as shown in FIG. 2, an object that the flying object 21 should originally capture and track (
In addition to objects (hereinafter referred to as real targets 23) that emit radio waves with a power greater than the reflected signal of the real targets 23, or objects such as corner reflectors that have a larger radar reflection cross section than the real targets 23 (hereinafter referred to as deceptive objects), When there is a deceptive target 24), the conventional target tracking device determines these maximum received signals as reflected signals from the real target 23 in the search mode, processes the signal, switches to the tracking mode, and detects the deceptive target 24. It had the disadvantage of being tracked.

SUMMARY OF THE INVENTION An object of the present invention is to provide a target search and tracking device that solves the above-mentioned drawbacks, distinguishes between a real target and a deceptive target in a search mode, and tracks the real target in a tracking mode.

(Means for Solving the Problems) The means provided by the present invention to solve the above-mentioned problems is to emit search radio waves to a range where a target is expected to exist, and to collect reflected radio waves from the targets. A target search and tracking device that receives a received signal to generate a received signal, processes the received signal to obtain information on the characteristics of the received signal and the distance to the target, and tracks the target. means for previously storing received signal strength and other information as received signal reference information, and comparing the received signal characteristic information obtained by the processing with the received signal reference information in correspondence with the distance, and determining the correlation between these two pieces of information. means for switching the operating mode from the search mode to the tracking mode when the search mode is within a predetermined range.

(Example) Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. When the operating mode of this embodiment is in the search mode, the search signal generator 9 outputs a search signal 109 for horizontally scanning the antenna beam. This signal 109 passes through the search/track switch 10, is amplified by the servo amplifier 11, and operates the torquer 12. At this time, the antenna 1 is driven horizontally and mechanically scans the beam to search for the target. In the search mode, the search and track switch 10 switches the angle error detector 8
The servo amplifier 12 provides a search signal 109, blocking the angular error 108 that may otherwise occur. Also, in the search mode, the transmission signal 141 of the transmitter 4 is transmitted to the antenna 1 via the transmitter/receiver switch 2. The reflected wave is received by the receiver 3. The receiver 3 outputs the received signal 103 to the distance calculator 5. The distance calculator 5 calculates the distance to the reflection point using the z number 142 synchronized with the transmitted signal 141 and the received signal 103, and outputs the distance 105 to the reference value generator 6.

The reference value generator 6 sends to the comparator 7 a reference value 106 representing the estimated strength of the received signal 103 with respect to the specific target, which is stored in advance. The reference value 106 is determined according to the distance #1105. A comparator 7 compares this reference value 106 and the received signal 103. The comparator 7 switches the search and tracking switch 10 when the strength of the received signal 103 falls within a certain range from the reference value 106.
A switching signal 107 is sent to. Upon receiving the switching signal 107,
The switch 10 cuts off the search signal 109, supplies the angle error signal 108 to the servo amplifier 11, and switches to the tracking mode.

As explained above, in the embodiment of FIG. 1, the received fε signal strength is estimated in advance in accordance with the distance with respect to a specific target, and the quasi-determined receiver signal strength is stored as a reference value, and the received signal strength obtained in the search mode is Strength of signal 103 and T:, Preparation 10
5 and when these two values almost match,
Switch to tracking mode.

Therefore, in this embodiment, even if there is a deceptive target such as a strong oscillation source or a Hoonar reflector, it is easy to distinguish between the deceptive target and the real target, and therefore it is easy to track only the real target. has excellent anti-electronic interference properties.

In the embodiment shown in FIG. 1, the comparator 7 distinguishes between a real target and a deceptive target depending on whether the strength of the received signal 103 is within a predetermined range. However, in the present invention, regarding the received signal,
The characteristics such as waveform and frequency are estimated and stored as received signal reference information, and similar characteristic information of the received signal 103 is compared with the received signal reference information, and when the correlation between both pieces of information is within a predetermined range. The object of the invention can also be achieved by determining that the target is a real target and switching to the tracking mode to track the real target.

(Effects of the Invention) According to the present invention, as described above, it is possible to provide a target search and tracking device that distinguishes between a real target and a deceptive target in the search mode and tracks the real target in the tracking mode.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing the operational concept of the target search and tracking device. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Transmission/reception switch, 3... Receiver, 4... Transmitter, 5... Distance calculator, 6... Reference value generator, 7... Comparison 8...Angle error detector, 9...Search signal generator, 10...Search and track switch, 11...Servo amplifier, 12...Toruka.

Claims (1)

[Claims] A search radio wave is emitted in a range where a target is expected to exist, and reflected radio waves from the target are received to generate a received signal, and the received signal is processed to obtain information on the characteristics of the received signal and the distance to the target. In the target search and tracking device for tracking the target, means for pre-storing the strength of the received signal estimated regarding the target and other information as received signal reference information, and the received signal characteristics obtained by the processing. A target search comprising means for comparing the information and the received signal reference information in correspondence with the distance and switching the operating mode from the search mode to the tracking mode when the correlation between the two pieces of information falls within a predetermined range. Tracking device.