JPS5836732B2 - Radio and sonic shared exploration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a radio and acoustic exploration device that remotely measures the vertical distribution of atmospheric temperature, for example.
c Sounding System: RASS, hereinafter abbreviated as RASS.

) regarding. Conventional laths had the disadvantage that the sonic emitter beam center and the radio antenna beam center were located on separate axes, which resulted in low received signal strength and difficulty in surveying to high altitudes.

The operation of a conventional lath will be explained with reference to FIG.

In Figure 1, 1 is a sound wave radiator, 2 is a radio wave transmitting antenna,
3 is a radio wave receiving antenna, 4 is a radio wave transmitter, 5 is an attenuator, 6
1 is a mixer, 7 is an amplifier, 8 is a Dobra measurement circuit, 9 is a processing circuit, 10 is a recorder, 11 is a sound wave transmitter, and 12 is a synchronization signal generator.

In the following explanation, the atmosphere will be described as an example of the gas to be measured.

The sound wave radiator 1 receives the audible pulse output of the sound wave transmitter 11 and emits pulsed sound waves.

The emitted pulsed sound waves propagate through the atmosphere in the form of almost spherical air density, and due to the periodic non-uniformity of the relative dielectric constant due to the air density, one of the radio waves emitted from the radio wave transmitting antenna 2 is part is reflected.

The wavelength of the transmitted radio wave is selected to be approximately twice the wavelength of the sound wave, and the reflected waves are successively reflected by the wave front of the sound wave, coherently added, and received by the radio wave receiving antenna 3.

This received signal is subjected to a Dobra shift due to the speed of sound.

Next, a portion of the transmission power generated by the radio wave transmitter 4 is subjected to homodyne detection with the signal supplied through the attenuator 5 by the mixer 6, and the Doppler frequency is detected.

This Doppler frequency is amplified by an amplifier 7 and then measured by a Doppler measurement circuit 8 using a method such as wavelength measurement at regular time intervals based on a time signal synchronized with the pulsed sound emission time generated by a synchronization signal generator 12. After that, the processing circuit 9 performs a calculation using the following relational expression in order to convert it into an absolute degree T.

Here, D is the Doppler frequency, and K is a constant determined by the molecular weight of the gas, humidity, etc.

The signal subjected to this calculation process is supplied to the recorder 10, and the relationship between altitude and temperature is recorded.

In the conventional lath, the radio wave transmitting antenna 2, the radio wave receiving antenna 3, and the sound wave radiator 1 are independent as described above, so the second
As shown in the figure, the angle θ1 between the central axis of the wavefront of the sound wave and the incidence of the radio wave on the wavefront is large, and if the interval between the transmitting and receiving antennas is increased to reduce the leakage of radio waves between transmitting and receiving, θ1 becomes even more narrow, and the angle θ1 becomes more narrow from the wavefront. This has the disadvantage that the efficiency with which reflections are coherently added becomes low, and the received signal strength is significantly reduced.

In order to eliminate the above-mentioned drawbacks, the present invention uses a sonic radiator and a radio wave transmitting antenna in which the sonic wave radiating point and the radio wave radiating point are located on the same axis. This will be explained in detail below with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, in which 21 is a primary acoustic wave radiator;
2 is a primary radio wave radiator, 23 is a reflecting mirror, 24 is a sound wave shielding tube, and 25 is a radio wave absorber.

The operation of this is that the sound waves emitted from the primary sound wave radiator 21 are reflected by the parabolic reflector 23 and radiated upward, and the radio waves emitted from the radio wave primary radiator 22 using a dipole with a reflector are shared with the sound waves. The beam is reflected by the reflecting mirror 23 and radiated upward, and the center of the sound wave radiation beam and the center of the radio wave radiation beam are approximately on the same axis.

．． Therefore, in this antenna, the center of the sound wave emission beam and the radio wave emission beam are almost coaxial, so the relationship between sound wave propagation and radio wave reflection in the lath is as shown in Figure 4, and the angle θ2 at which the radio wave enters the sound wave surface is As the incident angle θ1 in the conventional lath shown in FIG. 2 increases, the efficiency of coherent addition of reflected radio waves increases.

Furthermore, by covering the inner surface of the sound wave shielding tube 24 with a radio wave absorbing material 25, the amount of radiated radio waves leaking to the receiving antenna can be reduced, and the receiving sensitivity is further improved.

In this example, the sonic radiator is placed on the same radiation beam as the radio wave transmitting antenna, but it is also possible to incorporate the sonic radiator into the radio wave receiving antenna and place their beams on the same axis. Almost the same result is obtained.

Furthermore, in Fig. 3, the radio wave transmitting antenna is configured with a dipole antenna with a reflector and a reflector is provided, but the antenna may be configured with another antenna such as a loop antenna, or the reflector may be omitted. .

As explained above, according to the present invention, the transmitting and receiving beams of the radio waves of the sound wave beam are aligned on the same axis, so the efficiency of coherent addition of the reflected radio waves is improved, the accuracy is improved, and the antenna is also compact. can be converted into

Furthermore, since the transmitting and receiving antennas are independently covered with a radio wave absorbing material and a sound wave shielding material, there are advantages such as good isolation between transmitting and receiving.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a radio/sonic probe system, Fig. 2 is an explanatory diagram of transmission/reception operations in a conventional radio/sonic probe, Fig. 3 is a diagram showing an embodiment of the present invention, and Fig. 4 is a diagram of the present invention. FIG. 4 is an explanatory diagram of transmission and reception operations when the above is implemented. 1...Sonic wave radiator, 2...Radio wave transmitting antenna, 3...
・Radio wave receiving antenna, 4...transmitter, 6...mixer,
8... Dotsupura measuring instrument, 9... Processing circuit, 10...
-Recorder, 11...Sound wave transmitter, 12...Synchronization signal generator, 21...Sound wave radiator, 22...Radio wave radiator, 23...Reflector, 24...Sound wave shield Tube, 25...
・Radio wave absorbing material.

Claims (1)

[Claims] 1. To measure the mixture, a sound wave is emitted into a gas, and then a radio wave is emitted to the surface of the sound wave, and the reflected radio wave from the surface of the sound wave is received, and from the transmitted and received signal. A radio/sonic wave shared exploration device that measures the temperature of gas by detecting the Doppler frequency due to the speed of sound, characterized in that the beam center of the sonic radiator and the beam center of the radio wave transmitting antenna (or radio wave receiving antenna) are configured on the same axis. A radio/sonic wave shared exploration island 2 emits a sound wave into the gas to measure humidity, then emits a radio wave to the surface of the sound wave, receives the reflected radio wave from the surface of the sound wave, and receives the transmitted and received signal. In a radio-acoustic shared exploration device that measures the temperature of a gas by detecting the Doppler frequency due to the speed of sound, the beam center of the sonic radiator and the beam center of the radio wave transmitting antenna (or radio wave receiving antenna) are arranged on the same axis, 1. A radio/sonic exploration device characterized in that a sonic radiator and a radio wave transmitting antenna (or a radio wave receiving antenna) are covered with a certain cylinder made of a radio wave absorbing material and a sound insulating material.