JPS6141979A - Radio wave receiving device - Google Patents

Abstract

PURPOSE:To receive a radio wave incoming from a wide elevation angle and to obtain information of elevation angle area in relation to the incoming elevation angle of radio wave by selecting one of signals inputted from a low elevation angle antenna and a high elevation angle antenna by a signal selecting circuit. CONSTITUTION:Signals received by a low elevation angle antenna 7 having a radiation pattern 5 directed to low elevation angle including nearly horizontal direction in a vertical face, and a high elevation angle antenna 8 having a radiation pattern 6 directed to high elevation angle including nearly the zenith direction and having superposed part with the pattern 5 are amplified, applied with frequency conversion and detection respectively, by receiving circuits 9-1, 9-2, and the signal intensity is measured by signal intensity measuring circuits 10-1, 10-2 and sent to a signal intensity comparator circuit 11. There, the intensity of received signals measured by circuits 10-1, 10-2 is compared, and signals higher in intensity is discriminated. A signal selecting circuit 13 selects signals higher in intensity out of signals sent from delay circuits 12-1, 12-2 according to the output of the circuit 11. Thus, receiving of a radio wave wide in elevation angle range is made possible, and the uncertainty of output signal can be eliminated by making 1 target 1 output.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a radio wave receiving device, and more particularly to a radio wave receiving device that receives radio waves from an elevation angle from the horizontal direction to the zenith.

(Prior Art) Conventionally, in order to receive incoming radio waves from a wide range of elevation angle directions, this type of radio wave receiving device has aimed an antenna 2 having a radiation pattern 1 with a wide beam width toward the zenith as shown in Fig. 1. Alternatively, as shown in FIG. 2, an antenna 4 having a radiation pattern 3 with a wide beam width was directed approximately horizontally.

Therefore, in the method shown in Fig. 1, the antenna gain in the vicinity of the horizontal direction is insufficient, so the sensitivity of the radio wave receiving device is insufficient for radio waves arriving from the vicinity in the horizontal direction, and the detection distance is shortened or the antenna gain is insufficient in the horizontal direction. The disadvantage of not being able to receive incoming radio waves from nearby areas is that the method shown in Figure 2
Because the antenna gain near the zenith direction is insufficient, the sensitivity of the radio wave receiving device is insufficient for radio waves arriving from near the zenith direction, and a range where reception is difficult occurs near the zenith direction or reception is impossible. There were drawbacks.

Furthermore, if the antenna is configured to cover a wide range of elevation angles while allowing a decrease in sensitivity, there is a drawback that no information can be obtained regarding the elevation angle at which the radio waves arrive.

(Object of the Invention) The object of the present invention is to eliminate the above-mentioned drawbacks, and to make it possible to receive incoming radio waves from a wide range of elevation angles, as well as to obtain elevation angle area information regarding the elevation angle of arrival of the radio waves. The goal is to provide equipment.

(Structure of the Invention) A radio wave receiving device according to the present invention includes a low-elevation antenna oriented in a low-elevation angle region including a substantially horizontal direction in a vertical plane, and a radiation pattern of the low-elevation antenna and a portion overlapping with the radiation pattern of the low-elevation antenna, and a substantially zenith direction. a high-elevation antenna directed to a high-elevation angle region including the above, and output signals of the respective antennas as input signals, and one of the two input signals is automatically output based on the magnitude relationship of the input signals. It is configured with a functional signal selection circuit.

(Embodiments of the Invention) Next, embodiments of the present invention will be described with reference to FIGS. 3 and 4.

FIG. 3 shows a vertical section of the antenna radiation pattern of the radio wave receiving device according to the invention. The antenna radiation pattern of the radio wave receiving device of the present invention consists of a radiation pattern 5 and a radiation pattern 6, which are formed by a low elevation antenna 7 and a high elevation antenna 8, respectively. The radiation pattern 5 is a donut-shaped radiation pattern that has directivity in the approximately horizontal direction and is non-directional in the horizontal plane, and is formed by the low elevation angle antenna 7. The radiation pattern 6 has an overlapping portion with the radiation pattern 5, and is a directional radiation pattern with a relatively wide beam width directed approximately toward the zenith, and is formed by the high-elevation antenna 8.

FIG. 4 shows a system diagram of an XW receiver according to the present invention.

The system of the radio wave receiving device of the present invention is a low elevation antenna 7, a high elevation antenna 8, a receiving circuit 9-1, a receiving circuit 9-2, a signal strength measuring circuit 10-1, a signal strength measuring circuit 10-2, and a signal strength. It is composed of a comparison circuit 11, an equal signal delay circuit 12-1, a signal delay circuit 12-2, and a signal selection circuit 13. The low elevation antenna 7 has directivity in the approximately horizontal direction and has an omnidirectional radiation pattern in a doughnut-shaped horizontal plane, and the high elevation antenna 8 has a radiation pattern overlapped with the radiation pattern of the low elevation antenna 7. , has a relatively wide beam width and directional radiation pattern directed roughly toward the zenith. Receiving circuit 9-1
and 9-2 performs amplification frequency change, detection, etc. of the input signal. Signal strength measuring circuits 1°-1 and 10-2 measure the strength of input signals.

The signal strength comparison circuit 11 compares the signal strengths and determines which one is stronger. The signal delays @Wr12-1 and 12-2 delay the received signal t by a time corresponding to the processing time of the signal strength measurement circuits 10-1 and 1o-2 and the signal strength comparison circuit 11. The signal selection circuit 13 selects an input signal based on the result of the signal strength comparison circuit 11.

The operation of the radio wave receiving apparatus of the present invention will be explained with reference to FIG. 3. The radiation pattern 5 receives radio waves arriving from a low elevation angle, and the radiation pattern 6 receives radio waves arriving from a high elevation angle. Generally, one wave arriving from any elevation angle is received by both the radiation pattern 5 and the radiation pattern 6, and the reception level at that time is determined by the directivity-shape of the radiation pattern 75 and the radiation pattern 6 and the elevation angle of the arriving radio wave. Yosho is different.

Next, referring to FIG. 4, in FIG. 3, signals received by the low elevation antenna 7 having a radiation pattern 5 and the high elevation antenna 8 having a radiation pattern 6 are amplified by receiving circuits 9-1 and 9-2, respectively. , frequency conversion, detection, etc. are performed, and the signal strength is measured by signal strength measurement circuits 10 - 1 and 10 - 2 and sent to a signal strength comparison circuit 11 . The signal strength comparison circuit compares the strengths of the received signals measured by the signal strength measurement circuits 10-1 and 10-2, and determines which signal is stronger. On the other hand, receiving circuits 9-1 and 9-2
The output signal passes through signal strength measurement circuits 10-1 and 10-2 and delay circuits 12-1 and 12-2 having a delay time that roughly matches the processing time in signal strength comparison circuit 11, and then goes to signal selection circuit 13. Sent. The signal selection circuit 13 selects the stronger signal among the signals sent from the delay circuits 12-1 and 12-2 according to the output of the signal strength comparison circuit 11.

As a result, it is possible to receive incoming radio waves over all elevation angles, and it is also possible to obtain approximate radio wave arrival elevation angle =, t6 range information, and furthermore, it is possible to receive the signal with the higher reception level from the outputs of the two receiving systems. can be selectively received.

In this example, a radio wave receiving device using two types of antennas is shown. However, the high-elevation antenna is configured with two or more types of antennas with different elevation angles, and a total of three or more types of antennas are directed at different elevation angles. In this case, signal selection can be performed between adjacent antennas in the same way as in the case where the two types of antennas are used, and as a result, it becomes possible to finely determine the area information of the radio wave arrival elevation angle.

(Effects of the Invention) As explained above, one aspect of the present invention is to arrange two or more types of antennas with different pointing directions in the elevation plane and select a received signal based on the magnitude relationship of the output signal levels of each system. Above all, it enables radio wave reception over a wide range of elevation angles,
In addition, by outputting the first eye s1, it is possible to eliminate uncertainty in the output signal and to obtain area information on the angle of arrival elevation.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an example of an aerial break pattern of a conventional radio wave receiving device that receives incoming radio waves with a wide elevation angle range J, and Fig. 2 shows a conventional radio wave receiving device that receives incoming radio waves with a wide elevation angle range. FIG. 3 is a vertical sectional view showing the antenna pattern of another example of the radio wave receiving device of the present invention, FIG. 4 is a vertical sectional view showing the antenna pattern of the radio wave receiving device of one embodiment of the present invention. FIG. 2 is a block diagram showing the device. 1... Radiation pattern directed towards the zenith, 2...
... Antenna oriented toward the zenith, 3... Radiation pattern directed roughly in the horizontal direction, 4... Antenna directed roughly in the horizontal direction, 5...・Radiation pattern oriented approximately horizontally, 6... Radiation pattern oriented toward the zenith, 7... Low elevation antenna oriented approximately horizontally, 8... zenith High elevation antenna oriented in the horizontal direction, 9-1... Receiving circuit for the antenna system oriented in the approximately horizontal direction, 9-2...
Receiving circuit for an antenna system directed toward the zenith, 10-
1... Signal strength measurement circuit for an antenna system directed in the approximately horizontal direction, 10-2... Signal strength measurement circuit for an antenna system directed in the zenith direction, 11...
. . . Signal strength comparison circuit, 12-1 . . . Delay circuit for an antenna system directed approximately in the horizontal direction, 12-
2...Delay circuit for the antenna system directed toward the zenith; 13...Signal selection circuit. Kaya /1! I Warehouse 2 Country #3 Gap

Claims (1)

[Claims] a low-elevation antenna oriented in a low-elevation angle region including a substantially horizontal direction in a vertical plane; a high-elevation antenna having a radiation pattern overlapping with the radiation pattern of the low-elevation antenna and oriented in a high-elevation angle region including a substantially zenith direction; It is characterized by having a signal selection circuit having a function of taking the output signal of each antenna as an input signal and selectively outputting one of the two input signals based on the magnitude relationship of the input signals. Radio wave receiving device.