JPH0496524A - Microwave diversity receiver - Google Patents

Abstract

PURPOSE:To improve a main signal intensity versus disturbing wave ratio by receiving a reflected wave by an angle diversity antenna and applying a reflection signal generated by a signal circuit network of inverted phase to a main signal in an opposite phase. CONSTITUTION:A main radiator 11 of an angle diversity antenna 1 receives both a main signal wave and a reflecting wave and a master receiver 2 receives both the signals. A reflecting wave radiator 12 adjusts the angle of the reflecting wave radiator 12 so as to maximize a reflection signal and sends a reflecting wave reception signal to a reflecting wave receiver 4. A signal inputted to the main receiver 2 and the reflecting wave receiver 4 matches the phase of both the signals of the main receiver 2 and the reflecting wave receiver 4 by using an oscillation signal generated from a common local oscillator 3. The signal from the reflecting wave receiver 4 is subject to phase inversion by a signal circuit network 6 for inverting phase and mixed at a mixer 5 so that the phase is inverted to the reflection signal included in the main reception signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microwave diversity system, and more particularly to a microwave diversity system that can cancel out disturbance waves reflected from the ground or the sea.

[Conventional technology]

In the case of ankle diversity in a conventional microwave space diversity system, it is possible to distinguish and receive the main reception wave and the reflected wave from the ground or sea, and the main reception wave and the reflected wave from the sea are converted into other polarized waves. Two signals, including the component's reflected wave, were integrated and received.

[Problem to be solved by the invention]

The conventional microwave diversity system described above has a method of integrating two waves, the main signal wave and the interference wave, so it is not possible to improve the ratio of the main signal strength to the interference signal strength, and the difference between the polarizations is This method has the disadvantage that it cannot prevent the occurrence of interference, etc. In addition, in marine propagation, it is necessary to design the station so that it is not affected by reflected waves, and there is also the disadvantage that the station must be placed in a geographically disadvantageous location.

[Means to solve the problem]

The microwave diversity system of the present invention includes an angle diversity antenna including a main radiator and a reflected wave radiator, a reflected wave receiving device for a reflected wave signal received by the reflected wave radiator, and a reflected wave receiving device for a reflected wave signal received by the reflected wave radiator; a main receiving device that receives a mixed signal including the main received wave signal received by the main receiving wave signal and the reflected wave signal; a main signal phase detector that detects the phase of the mixed signal; the main receiving device and the main signal phase; a mixer connected between the wave detector and a reflected wave phase detector that detects the phase of the reflected wave signal that is the output of the reflected wave receiving device;
A detection signal of the main signal phase detector and a detection signal of the reflected wave phase detector are input, the phases of the main signal and the reflected wave signal are compared, and the signal is branched and inputted from the reflected wave receiving device. and an inversion phase control means for substantially inverting the phase of the reflected wave signal, and supplies the inverted reflected wave signal to the mixer.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an angle diversity antenna, which is the main part of this embodiment. The embodiment shown in FIG. 1 includes an angle diversity antenna 1, a main receiving device 2 for receiving the main signal, a common local oscillator 3,
It is comprised of a reflected wave receiving device 4 for receiving reflected signals, a mixer 5, a signal circuit network 6 for inverting the phase of reflected waves, a main signal phase detector 7, a control device 8, and a reflected wave phase detector 9. Further, the angle diversity antenna 1 includes a reflector 10, a main radiator 11, and a reflecting radiator 12.

Next, the operation of this embodiment will be explained. First, the main radiator 11 of the angle diversity antenna shown in FIG. 2 receives both the main signal wave and the reflected wave, and the main receiving device 2 receives both signals. When installing the reflected wave radiator 12, consider the reflected wave direction and install the reflected wave radiator 1 so that the reflected signal is maximized.
2, and sends this reflected wave receiving signal to the reflected wave receiving device 4. The signals input to the main receiver 2 and the reflected wave receiver 4 are aligned in phase by an oscillation signal generated from the common local oscillator 3. The signal from the reflected wave receiver 4 undergoes phase inversion in a signal circuit network 6 with an inverted phase, and is mixed in a mixer 5 so that it has an opposite phase to the reflected signal contained in the main received signal. Here, the control device 8 inputs the results of measuring the levels of the main signal and the interference signal by the main signal phase detector 7 and the reflected wave detector 9, and outputs an inverted phase signal so that the interference signal level is minimized. Controls the circuit network 6. Therefore, only the main signal from which the interfering signal has been canceled is taken out from the output cuff A.

〔Effect of the invention〕

As explained above, the present invention can improve the main signal strength to interference wave ratio by receiving the reflected wave by the angle diversity antenna and adding the reflected signal created by the inverted phase signal network to the main signal in the opposite phase. Therefore, it has the effect of suppressing the effects of interference, etc. Furthermore, even under adverse conditions such as on marine propagation routes, microwave communication is possible even when the station is located in a geographically and economically advantageous location.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an angle diversity antenna, which is the main part of this embodiment. DESCRIPTION OF SYMBOLS 1... Angle diversity antenna, 2... Main receiving device, 3... Common local oscillator, 4... Reflected wave receiving device, 5... Mixer, 6... Signal circuit network for inverted phase , 7... Main signal phase detector, 8... Control device, 9
...Reflected wave phase detector, 0...Reflector, ...Main radiator, ] 2...Reflected wave radiator.

Claims (1)

[Claims] 1. An angle diversity antenna including a main radiator and a reflected wave radiator, a reflected wave receiving device for a reflected wave signal received by the reflected wave radiator, and the main radiator. a main receiving device that receives a mixed signal including the main received wave signal received by the main receiving wave signal and the reflected wave signal; a main signal phase detector that detects the phase of the mixed signal; the main receiving device and the main signal phase; a mixer connected between the wave detector, a reflected wave phase detector that detects the phase of the reflected wave signal that is the output of the reflected wave receiving device, and a detection signal of the main signal phase detector and the reflected wave. Inversion phase control that inputs the detection signal of the phase detector, compares the phases of the main signal and the reflected wave signal, and almost inverts the phase of the reflected wave signal that is branched and input from the reflected wave receiver. and means for supplying the inverted reflected wave signal to the mixer. 2. The microwave diversity system according to claim 1, wherein the reflected wave radiator of the angle diversity antenna has a structure that allows the angle to be adjusted in the incident direction of the reflected wave.