JPH0421985U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a block diagram of one embodiment of the present invention;
This figure is a block diagram of another embodiment of the present invention, and FIG. 3 is a block diagram showing a conventional tracking receiver of this type. 1... RF sum signal input terminal, 2... RF difference signal input terminal, 3... Phase modulator, 4... Frequency converter, 5... Voltage controlled oscillator, 6... AGC amplifier, 7... Second phase detector, 8...first phase detector, 9...reference signal oscillator, 10...90 degree phase shifter, 11...AGC loop filter, 12...
PLL loop filter, 13...Error signal detector, 14...Clock generator, 15...Error signal output terminal, 16...Second phase shifter, 17...Third phase detector, 18, 22 ...Phase control circuit, 21
...First phase shifter.

Claims (1)

[Claims for Utility Model Registration] 1. A phase modulator that modulates the phase of an RF difference signal from an antenna using a clock signal, and a combining circuit that combines an output signal of the phase modulator and an RF sum signal from the antenna. , a frequency converter that converts the frequency of the output signal from the synthesis circuit using a local oscillation signal and outputs the frequency converter, an AGC amplifier that amplifies the output of the frequency converter, and an output from the AGC amplifier that converts the frequency of the output signal from the synthesis circuit using a reference signal a first phase detector that performs phase detection and outputs; a reference signal oscillator that outputs the reference signal; a PLL loop filter that outputs a predetermined low frequency component of the output from the first phase detector; a voltage controlled oscillator that is controlled by the output voltage of the PLL loop filter and outputs the local oscillation signal; a 90 degree phase shifter that changes the phase of the reference signal by 90 degrees; and a 90 degree phase shifter that changes the phase of the reference signal by 90 degrees; a second phase detector that detects and outputs the output from the phase shifter; and a predetermined low frequency component of the output of the second phase detector that outputs a predetermined low frequency component and adds the gain of the AGC amplifier to the AGC amplifier. and an error signal detection circuit that synchronously detects the output of the second phase detector with the clock signal to detect and output an error signal, which is input to the synthesis circuit. a first phase shifter that is inserted into a transmission path for an RF sum signal or a transmission path for an RF difference signal to change the phase of a signal passing through the transmission path; and a control signal is applied to the first phase shifter. A tracking receiver comprising: a phase control circuit that changes the amount of phase given to the RF signal passing through the first phase shifter. 2. The tracking receiver according to claim 1, wherein the A
a third phase detector that detects the phase of the output from the GC amplifier using the output from the reference signal oscillator and outputs the phase detector; or a transmission path between the reference signal generator and the third phase detector to change the phase of the signal passing through the transmission path. 2
and a phase shifter that controls the second phase shifter instead of the phase control circuit that controls the first phase shifter to change the amount of phase given to the signal passing through the second phase shifter. A tracking receiver comprising: a phase control circuit; and an error signal detector inputting the output from the third phase detector instead of the output from the second phase detector.