JP2548032Y2 - Tracking receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking receiver used for tracking the direction of a moving signal source.

[0002]

2. Description of the Related Art FIG. 2 is a diagram showing a configuration of a conventional tracking receiver, wherein 1 is a receiving carrier input terminal, 2 is a receiving signal input terminal having a beam directivity component, 3 is a coupling circuit, and 4 is an amplifying section. ,
5 is a PSK (Phase Shift Keying) modulation circuit, 6 is a carrier synchronization circuit, 7 is a PSK demodulation circuit, 8 is a carrier signal synchronized with the received input signal, 10 is a beam error signal reproduction circuit,
11 is a beam error signal, and 13 is a clock generation circuit.

Next, the operation will be described. There are various methods for tracking a moving signal source.
PSK-modulates the beam directivity component and superimposes it on the carrier,
A tracking receiver that reproduces a beam pointing error signal with a single receiver and performs tracking control of an antenna.

[0004] A signal component having a maximum gain in the front direction of an antenna used for tracking is input to a reception carrier input terminal 1. A reception signal input terminal 2 having a beam directivity component
, A signal component having the maximum gain at a certain angle with respect to the front direction of the antenna is input.

[0005] A signal input from the reception signal input terminal 2 having a beam directivity component is supplied to the PSK modulation circuit 5 by the clock signal generated by the clock generation circuit 13.
The signal is SK-modulated and superimposed on the signal input from the receiving carrier input terminal 1 in the coupling circuit 3. The output signal of the coupling circuit 3 is amplified by the amplifier 4 so as to be a signal suitable for signal processing. At this time, processing such as frequency conversion is performed as necessary. The output signal of the amplifier 4 is input to a narrow-band bandpass filter 14 for removing the PSK modulation component, and then input to the carrier synchronization circuit 6. The carrier wave synchronizing circuit 6 is usually constituted by a phase locked loop circuit or the like, and produces a carrier wave signal 8 synchronized with the received signal. Using this signal, a PSK demodulation circuit 7 for synchronously detecting the output signal of the amplifying unit 4 generates a PS having a beam directivity component.
The K-modulated received signal is demodulated. Its output signal is
Clock generation circuit 13 which is a modulation wave of PSK modulation circuit 5
In the beam error signal reproducing circuit 10 that performs synchronous detection based on the output signal of the above, the beam error signal 11 is reproduced, the signal is sent to the antenna control circuit, and control is performed so as to be directed to the signal source that moves the antenna.

[0006]

[Problems to be Solved by the Invention] Conventional tracking receivers
With the configuration as described above, the carrier synchronization circuit 6
When creating the carrier 8 synchronized with the received signal, the band-pass filter 14 is used to remove the PSK modulated wave, thereby preventing the one that is pseudo-synchronized with the PSK modulated wave. However, when the reception frequency used in the tracking receiver increases, it becomes difficult to increase the PSK modulation frequency due to device restrictions. Therefore, when the PSK modulation frequency is lowered and superimposed on the carrier, the modulation wave exists near the carrier, and the PSK modulation wave cannot be removed unless the band of the band-pass filter 14 is extremely narrow. For this reason,
For example, it is necessary to lower the center frequency of the band-pass filter 14, which causes a problem that the configuration of the receiver becomes complicated.

The present invention has been made in order to solve the above-mentioned problems, and a tracking device capable of forming a carrier synchronized with a received signal without using a pseudo-synchronization without using the bandpass filter 14. The aim is to get a receiver.

[0008]

In the tracking receiver according to the present invention, the gate is opened by the lock-on signal after the carrier wave is synchronized, and the clock signal is input to the PSK modulation circuit 5 so that the PS signal is input.
K modulation is applied.

[0009]

The tracking receiver according to the present invention establishes synchronization without pseudo-synchronization without the band-pass filter 14 irrespective of the frequency of the PSK modulation because there is no PSK modulated wave before synchronization is established.

[0010]

[Embodiment 1] FIG. 1 is a diagram showing an embodiment of the present invention.
Reference numerals 0, 11, and 13 are exactly the same as those of the above-mentioned conventional apparatus. Reference numeral 9 denotes a lock-on signal output when the carrier synchronization circuit 6 synchronizes with the carrier, and 12 denotes a clock generation circuit 13 when the lock-on signal 9 is locked on.
Is a gate circuit that outputs the output signal of PSK to the PSK modulation circuit 5.

The basic operation is the same as in FIG. In the present invention, before the carrier synchronization circuit 6 synchronizes with the received signal, the gate 12 is closed and PSK modulation is not output from the PSK modulation circuit 5. After synchronization, the lock-on signal 9 is output from the carrier synchronization circuit 6, the gate 12 is opened, a clock signal is output from the clock generation circuit 13, and the PSK is output.
Modulation is applied.

[0012]

As described above, according to the present invention, when the carrier synchronizing circuit 6 synchronizes with the received signal, there is no PSK modulated wave, so that the bandpass filter 14 for removing the PSK modulated wave is not required. There is no pseudo synchronization with the PSK modulation wave.

Further, since it is not necessary to use the band-pass filter 14, it is possible to arbitrarily select the modulation frequency of the PSK modulation, and it is possible to easily perform modulation at a low frequency even if the reception frequency becomes high. effective.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a conventional tracking receiver.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reception carrier input terminal 2 reception signal input terminal having beam directivity component 3 coupling circuit 4 amplifying unit 5 PSK modulation circuit 6 carrier synchronization circuit 7 PSK demodulation circuit 8 carrier signal synchronized with input signal 9 lock-on signal 10 beam error signal Reproduction circuit 11 Beam error signal 12 Gate 13 Clock generation circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. A receiving carrier input terminal, a receiving signal input terminal having a beam directing component, a PSK modulating circuit for PSK modulating a receiving signal having a beam directing component,
A coupling circuit that superimposes a K-modulated wave on an input signal from the reception carrier input terminal, an amplification unit that amplifies an output signal of the coupling circuit to a required level, and a carrier synchronized with a reception carrier from the output signal of the amplification unit. A PSK demodulation circuit for performing PSK demodulation by an output of the amplifying unit and the synchronous carrier extracted by the carrier synchronization circuit; a clock generation circuit for performing PSK modulation;
The carrier synchronization circuit uses a lock-on signal indicating that synchronization has been established, and operates a gate circuit that operates so as to output a clock signal when locked, a signal demodulated by the PSK demodulation circuit; A tracking receiver, comprising: a beam error signal reproducing circuit for reproducing a beam error signal using a clock signal output by a clock generating circuit.