JPS6214000A - Guided missile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field] This invention relates to improving the characteristics of a target tracking device installed on a guided flying vehicle.

[Conventional technology]

FIG. 2 is a diagram showing the configuration of a conventional tracking system.

(II to (4) are antennas (A) that emit signals into the air and receive signals reflected by the target aircraft.
.

Antenna (A), Antenna ←), Antenna (D), (5
) from the signals received by these antennas. A comparator that produces sum and difference signals, <6) a transmitter that generates a continuous signal, (7) a duplexer that separates the transmitted and received signals, and <8) the signal output from the comparator (5). ．． A mixer that mixes the signal from the power divider 01 (to be described later) to generate the F signal, (91 is a mixer having the same function as mixer {8), and Q (I is the power from the local oscillator (1B) to be described later). A power divider that divides the I
A local oscillator that generates a signal with a frequency higher than the P frequency, α is an F amplifier that amplifies the IF signal output from the mixer (8), and G3 is an F amplifier that has the same characteristics as the I'F amplifier. The amplifier α6 is a phase detector that phase-detects the output signal of the IP amplifier a3 using the output signal of the IF amplifier a1 to extract an angle error signal, and the angle error signal does not have a lock-on signal output from the signal processor a9, which will be described later. Sometimes there is no output. aS is a signal processing circuit that performs signal processing such as frequency conversion and signal detection, and outputs a lock-on signal when the amplitude is greater than a predetermined value. On the other hand, two-phase detector a41
performs phase detection on the output signal of the IF amplifier Q2 using the output signal of the IF amplifier α and converts it into an angular error signal, and when there is a lock-on signal from the signal processing circuit α, the angular error signal is sent to the servo device W1aS. Output a signal. aS is a servo device that changes the pointing direction of antennas (1) to (4) according to the input angle error signal, and the servo device (IQ is).

It also serves to spatially stabilize the antennas +11 to (4) against mechanical imaging of guided flying objects.

Note that, for convenience of explanation, one error signal channel is omitted.

In such a configuration, the guided flying object.

Once fired, the transmitter (6) sends a signal to the comparator (5) through the duplexer (7). Here, the comparator (5) makes the signals the same phase and connects the antenna (1)
~ (4) and radiates into the air. The target aircraft has an antenna (
When entering the beams of 1) to (4), the reflected wave from the target aircraft of the radiated signal is received by the antenna (ll-(4)) and input to the comparator (5).The comparator (5)
The sum and difference signals of the four input signals are generated, and the difference signal is input to the mixer (8), and the sum signal is input to the mixer (91) through the duplexer (7). The signal is mixed with the signal from the power divider a[1] to become a power F signal, which is then input to the power amplifier 03.

After being amplified here, the signal is input to the 9-phase detector α core.

On the other hand, the mixer (9), like the mixer (8), mixes the input signal with the signals from the power divider aa7') and others. The signal is converted into a signal and then input to a power amplifier a3.

After being amplified here, the signal is input to a two-phase detector a4 and a signal processing circuit <19. The signal input to the signal processing circuit a9 is subjected to signal processing such as frequency conversion.

When the amplitude is greater than a predetermined value, a lock-on signal is output to the one-phase detector I. On the other hand, the 1st phase detector α performs phase detection on the output signal of the 11F amplifier aa using the output signal of the xy amplifier (11) and converts it into an angle error signal, and when there is a lock-on signal from the signal processing circuit a9.

Outputs the angle error signal to the servo device. Servo device Qe
changes the pointing direction of the antenna in response to the received angular error signal.

[Problem that the invention seeks to solve]

With conventional tracking devices, it is difficult to match the amplitude-one-phase characteristics of the sum and difference signal systems over a wide band, so when receiving noise-modulated broadband interference waves, the angle error signal of the tracking system is There was a problem in that it was susceptible to fluctuations in gain.

[Means for solving problems]

This invention was made in order to improve this problem.The antenna is divided into four parts so that the gain of the tracking system does not change when receiving a noise-modulated broadband interference wave from the outside. A phase shifter is installed in the power supply system, and this transmission phase is kept constant during steady state, and broadband interference wave tracking (hereinafter referred to as HOJ-
(Home ON Jammer), the tracking is performed in a sinusoidal manner, and tracking is performed using monopulse during steady state, and sequential roving during HOJ.

[Operation] When tracking a target, the transmission phase amount of the four phase shifters is kept constant and tracking is performed using a monopulse method.On the other hand, when tracking interference waves, the phase of each of the four phase shifters is changed by 90 degrees. Tracking is performed by sequential roving because K changes in a sinusoidal manner.

〔Example〕

FIG. 1 shows an embodiment of the present invention. In the figure (1)
~aO is exactly the same as the conventional tracking device. αη
~■ denotes a phase shifter (A) that changes the amount of transmission phase shift of a signal passing through in response to a control signal from a controller, which will be described later.
a), phase shifter ←), phase shifter ←), 3υ is HO, which will be described later.
7 A controller that generates a constant voltage during target tracking and a sine wave signal with a phase difference of 90° during HOJ based on the output signal from the judgment circuit (2). 23 is detected by a signal processing circuit α. A phase detector detects the phase of a sine wave signal using a phase shifter control signal and outputs an error signal.(To) detects the presence of interference waves, and detects a signal when the interference waves in a predetermined time domain exceed a predetermined value. The HOJ determination circuit 041 has a function of switching error signals output from two phase detectors.
When there is an output signal from the HOJ judgment circuit (c), the signal from the 9-phase detector is sent to the servo device, and when there is no signal from the HO, r judgment circuit (c), the signal from the 9-phase detector α4 is sent to the servo device. This is a switching circuit that outputs to

With such a configuration, the phase shifter (a) αηlcAm(2πf
t).

Phase shifter (a) αIKAsjn (2+rft-complete), phase shifter (7) a! IK2π A (2πft-7-), phase shifter) Kan KA picture (2πf
When the controller Qυ gives a control signal for t - earth π), the composite pattern of anti-s (a) (1), antenna (() +21, antenna (v (3), antenna) (4) is one axis. This is a sequential roving that rotates at a rotational speed of fHz, and the angle of inclination of the antenna beam from the central axis (hereinafter referred to as beam ind angle) is proportional to the amplitude AK of the control signal.

In the guided flying object tracking device configured as described above, the signal generated by the transmitter (6) is as follows.

It passes through the duplexer (7) and is sent to the comparator (51), supplying equal power to the four phase shifters. Each of the four phase shifters corresponds to a control signal output from the controller Qυ. After changing the phase of the four signals input from the comparator (5), the four antennas (1) to (4)
and is radiated into the air. The signals reflected by the target aircraft and the interference waves from the outside are transmitted to the antennas (1) to (5) again.
4), passes through phase shifter (17) ~ ■, and comparator (5)
Here, the output signals of each of the four phase shifters Qη~(a) are combined to create sum and difference signals. The sum signal passes through the duplexer (7) and is input to the mixer (9), where it is mixed with the signal of the local oscillator a9 that has passed through the power divider aa, and is converted into a signal F. After being amplified by amplifier Q3, signal processing circuit a9 and HOJ
Enters the judgment circuit. The HO, r determination circuit (to) switches the signal to switching circuit 0 when the amplitude of the input signal is greater than a predetermined value.
4 and the controller at+. When there is no output from the KHOJ circuit at first.

The transmission phase amount of the four phase shifters is constant, and the switching circuit Q4
passes the angular error signal from the phase detector a4, so it operates exactly the same as the conventional device. or.

When there is an output from the HOJ determination circuit (c), the controller Qυ receives the output signal from the HO, r determination circuit (to) and then
1:1 phase shifter (each with a phase shift of 90') sends a signal that changes like a sine wave and rotates the antenna and one phase shifter.

In addition, the switching circuit @ receives a signal from the controller Qυ.

The phase detector passes through the phase-detected angular error signal using a control signal from the controller, and causes the servo device αe to move the antenna so that the angular error signal becomes zero.

〔Effect of the invention〕

As explained above, in this invention, the amount of transmission phase shift of the four phase shifters is fixed, and when tracking is performed using a monopulse method and tracking interference waves, each of the four phase shifters is By shifting the phase by degrees and changing in a sinusoidal manner, it is possible to prevent gain fluctuations due to noise-modulated broadband interference waves.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the invention, and FIG. 2 is a diagram showing the configuration of a conventional flying object guidance device. In the figure, +11 to (41 is anti)-Cr)
, anti-)-@). (5) is a comparator,
(6) is a transmitter, (71 is a duplexer, (8) and (
9) is a mixer with an equivalent function, al is a power divider, α
11#-i local oscillator, aa and F amplifiers with equivalent functions, α4 is a phase detector, aS is a signal processing circuit,
aS is the servo device, fin ~ (2) is the phase shifter (a), phase shifter (a), phase shifter ←), phase shifter), QB is the controller, @
is a phase detector, (to) is a HOJ determination circuit, and @ is a switching circuit. Note that the same or corresponding parts in the two figures are designated by the same reference numerals.

Claims (1)

[Claims] 4 antenna elements, 4 phase shifters connected to them, and a comparator that supplies equal power to the 4 antenna elements, combines these antenna outputs during reception, and creates sum and difference signals. a phase shifter that controls the amount of transmitted phase of the phase shifter; a transmitter and a receiver that transmit and receive signals; and a signal processor that processes the received signal and performs lock-on determination;
two sets of phase detectors, a circuit that detects the presence of interference waves,
In a guided flying object equipped with a tracking device consisting of a switching circuit that switches error signals output by two sets of phase detectors and a servo device that changes the pointing direction of the antenna using this error signal, four units are used when tracking a target. Tracking is carried out using the monopulse method by keeping the amount of transmitted phase of each phase shifter constant. On the other hand, when tracking interference waves, the amount of transmitted phase of each of the four phase shifters is set to 90
A guided flying object equipped with a tracking device that rotates the beam and tracks the beam by sequential roving by changing the phase in degrees and sinusoidally.