JP4604692B2 - Communication system between flying objects, flying object, transmission / reception device and method thereof - Google Patents

Description

The present invention is a flying object communication system, the projectile relates transceiver instrumentation 置及 beauty method, particularly to DSSS (Direct Sequence Spread Spectrum) projectile communication system which performs communication between projectile using a method.

  FIG. 4 is a diagram for explaining a conventional inter-aircraft communication system. In FIG. 4, each of the aircrafts 100 and 200, which are flying bodies used in a conventional communication system between flying objects, is provided with an upper antenna (lower antenna) and a lower antenna (lower antenna) (not shown). In the communication between the aircrafts 100 and 200, the crew of each aircraft manually switches the antenna used for the communication.

  Patent Document 1 describes that a different spreading code is used for each of the first and second antennas provided in the base station. More specifically, in the base station of the third generation broadband mobile radio communication system, the first data field to be transmitted is spread using a spreading code uniquely associated with one of the first and second antennas. The second data field to be transmitted is spread using a spreading code uniquely associated with the other of the first and second antennas and then transmitted through the first and second antennas. ing.

Japanese translation of PCT publication No. 2004-524727 (pages 6-9, FIGS. 2-6)

  In the conventional inter-aircraft communication system, as described above, the crew of each aircraft manually switches the antenna used for communication, but as shown in FIG. 4, the movement of the aircraft and the change in attitude of the aircraft ( Shadow fading occurs especially by wings), which is particularly noticeable in aircraft with high mobility and severe attitude changes, and it is difficult to maintain a sufficient received signal level by manual antenna switching. There is a problem that there is.

  Further, in the mobile radio communication system described in Patent Document 1, there is one receiving antenna, and the influence of shadow fading due to the movement of the aircraft and the attitude change of the aircraft cannot be improved.

An object of the present invention, the flying object communication system capable of movement and posture change to obtain the stable reception signal level even in the flying object with vigorous projectile, is to provide a transmission and reception instrumentation 置及 beauty method.

The inter-flying body communication system according to the present invention is an inter-flying body communication system that performs communication between flying bodies, and the flying body includes a plurality of antennas, a transmitter, and a receiver, and the transmitters are the same. The data to be transmitted is spread using a different spreading code for each of the plurality of antennas and transmitted via the plurality of antennas, and the receiver transmits each of the plurality of antennas via the antenna. The received signals are despread using the different spreading codes to obtain a plurality of received signals corresponding to the number of the different spreading codes, and further to the plurality of received signals obtained corresponding to the plurality of antennas. The maximum value synthesis is performed on the image.

Communication method according to the invention, a plurality of antennas and the transmitter and the communication method of the projectile communication system which performs communication between projectile comprising a receiver, in one of the previous SL projectile, transmission same Transmitting the data to be spread using a different spreading code for each of the plurality of antennas and transmitting the data through the plurality of antennas , and for each of the plurality of antennas on the other side of the flying object, despreading using the different spreading codes a signal received through the obtaining a plurality of received signals corresponding to the number of said different spreading codes, further wherein the plurality of obtained corresponding to the plurality of antennas respectively And a receiving step for performing maximum value synthesis on the received signal .

A transmission / reception device according to the present invention is a transmission / reception device used in an inter-flying communication system that performs communication between flying objects, and the transmission / reception device includes a plurality of antennas, a transmitter, and a receiver. The same data to be transmitted is spread using a different spreading code for each of the plurality of antennas and transmitted via the plurality of antennas, and the receiver transmits the antenna for each of the plurality of antennas . multiple obtain a received signal, further wherein the plurality of reception obtained corresponding to s said plurality of antennas each corresponding to the number of said different spreading codes to despread with the different spreading code signals received via The maximum value synthesis is performed on the signal .

  A flying object according to the present invention includes the above-described transmission / reception device.

A communication method according to the present invention is a communication method of a transmission / reception apparatus used in an inter-flying communication system that performs communication between flying objects, the transmission / reception apparatus including a plurality of antennas, a transmitter, and a receiver, The transmitter transmits the same data to be transmitted using a different spreading code for each of the plurality of antennas and transmits the data through the plurality of antennas, and the receiver transmits each of the plurality of antennas. each, to obtain a plurality of received signals corresponding to the number of said different spreading codes to despread with the different spreading codes a signal received through the antenna, and further corresponding to the plurality of antennas respectively A reception step of performing maximum value synthesis on the plurality of received signals obtained .

  As described above, in the present invention, each flying object includes a plurality of antennas, and the transmission side spreads the same transmission data using a spreading code uniquely associated with each of the plurality of antennas, thereby the plurality of antennas. To send through. Then, the receiving side performs despreading processing using each of the plurality of spreading codes used on the transmitting side for each of the signals received via the plurality of antennas, and receives the signal based on the resulting signal. I try to get a signal.

  According to the present invention, in the inter-aircraft communication system in which communication is performed between projectiles each having a plurality of antennas, the transmission side uses the spread code uniquely associated with the plurality of antennas with the same transmission data. The reception side performs despreading processing using each of the plurality of spreading codes used on the transmission side for each of the signals received via the plurality of antennas. Since the reception signal is obtained based on the signal obtained as a result, the effect of suppressing the fluctuation of the reception signal level due to shadow fading and obtaining a stable reception signal level can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an aircraft used in an inter-aircraft communication system according to an embodiment of the present invention. As shown in FIG. 1, an aircraft 1 according to an embodiment of the present invention is provided with an upper antenna 2 at an upper part of a fuselage and a lower antenna 3 at a lower part of the fuselage. It communicates with the partner aircraft using the DSSS (Direct Sequence Spread Spectrum) method.

  FIG. 2 is a diagram showing a configuration of a transmission / reception apparatus included in the aircraft 1 of FIG. As shown in FIG. 2, the transmission / reception apparatus of the aircraft 1 includes an upper antenna 2, a lower antenna 3, connectors 4 and 5, a transmitter 10, and a receiver 20.

  The transmitter 10 includes spreading sections 11 and 12 that perform spreading modulation using different spreading codes A and B for the same transmission data, and power amplifiers (PA) 13 and 14.

  The receiver 20 includes low noise amplifiers (LNA) 21 and 22, mixers 23 and 24, local oscillators 25 and 26, A / D converters 27 and 28, and spreading codes A and B for input signals, respectively. And despreading units 29 and 30 that perform despreading processing using despreading codes A and B, which are the same code sequence, and the received signal by performing maximum value synthesis on the output signals of despreading units 29 and 30 A maximum value synthesis unit 31 to be obtained and a CPU 32 are included. The CPU 32 controls the maximum value synthesis unit 31 by monitoring the output signals of the despreading units 29 and 30.

  Next, the operation of the embodiment of the present invention will be described.

  First, the transmission operation will be described. In the transmitter 10, the spreading unit 11 multiplies the spreading code A by the multiplier 15 and performs spreading modulation on the same transmission data, and the spreading unit 12 multiplies the spreading code B by the multiplier 16. I do. The output signals spread by the spreading sections 11 and 12 are transmitted to the communication partner aircraft via the power amplifiers 13 and 14, the connectors 4 and 5, and the antennas 2 and 3.

  2 employs a TDI (Time Division Multiple Access) method, and performs only the above-described transmission operation in the transmission time slot allocated to the own device, and the reception operation described later in the other time slots. Do only.

  Next, the reception operation will be described. In the receiver 20, signals transmitted from the communication partner aircraft equipped with the same transmission / reception apparatus as the transmission / reception apparatus of FIG. Are respectively converted into IF signals, A / D converted by A / D converters 27 and 28, and input to despreading units 29 and 30.

  The despreading unit 29 multiplies the input signal by the despreading code A by the multiplier 29-1, and performs the despreading process by multiplying the despreading code B by the multiplier 29-2. Do. The despreading unit 30 multiplies the input signal by the despreading code A by the multiplier 30-1 and performs despreading processing by multiplying the despreading code B by the multiplier 30-2. Process.

  Then, under the control of the CPU 32, the maximum value combining unit 31 performs a maximum value combining process on the output signal subjected to the despreading process by the despreading units 29 and 30, and obtains a received signal.

  FIG. 3 is a diagram for explaining the maximum value synthesis process of the maximum value synthesis unit 31 in FIG. As shown in FIG. 3, the CPU 32 monitors the output signals of the despreading units 29 and 30 at a predetermined sampling interval S, and selects the output signal of the despreading units 29 and 30 that has the highest received signal level. The maximum value synthesis unit 31 is controlled to do so. Therefore, since a signal with the maximum level is always obtained as a received signal, fluctuations in the received signal level due to shadow fading can be suppressed, and a stable received signal level can be obtained. In FIG. 3, only two signals are shown for simplification of explanation, but in actuality, in this embodiment, the maximum is obtained at a predetermined sampling interval S from the four output signals of the despreading units 29 and 30. Of course, the level signal is selected.

  As described above, in the embodiment of the present invention, the transmission side spreads the transmission data using the spreading code uniquely associated with the upper antenna 2 and transmits it through the upper antenna 2, and transmits the same transmission data. It spreads using a spreading code uniquely associated with the lower antenna 3 and is transmitted via the lower antenna 3. The reception side despreads the signal received via the upper antenna 2 using a plurality of spreading codes used on the transmission side, and uses the signal received via the lower antenna 3 on the transmission side. Despreading is performed using a plurality of spread codes, and a received signal is obtained based on the resulting signal. Accordingly, it is possible to obtain a stable received signal level by suppressing fluctuations in the received signal level due to shadow fading.

  In the embodiment of the present invention, not only the despreading process using the despreading code A is performed on the signal received via one antenna but also the despreading process using the despreading code B is performed. However, since the DSSS method is adopted, the despreading processing of each of the despreading units 29 and 30 can be realized by a DSP (Digital Signal Processor) 40 as shown in FIG. Therefore, quadruple diversity with two antennas can be realized without hardware duplication. As a matter of course, as shown in FIG. 2, the maximum value synthesis processing of the maximum value synthesis unit 31 is also realized by the DSP 40.

It is a figure which shows the aircraft used for the communication system between flying bodies by the Example of this invention. It is a figure which shows the structure of the transmission / reception apparatus which the aircraft of FIG. 1 has. It is a figure for demonstrating the maximum value synthetic | combination process of the maximum value synthetic | combination part of FIG. It is a figure for demonstrating the conventional communication system between flying bodies.

Explanation of symbols

1 Aircraft
2 Upper antenna
3 Lower antenna
4,5 connector
10 Transmitter
11,12 Diffusion part
13,14 PA
15,16 multiplier
20 Receiver
21, 22 LNA
23, 24 mixer
25, 26 LO
27, 28 A / D converter
29, 30 Despreading section 29-1, 29-2, 30-1, 30-2 Multiplier
31 Maximum value composition
32 CPU
40 DSP

Claims (7)

A communication system between flying objects that performs communication between flying objects,
The flying object includes a plurality of antennas, a transmitter, and a receiver,
The transmitter spreads the same data to be transmitted using a different spreading code for each of the plurality of antennas and transmits the data through the plurality of antennas .
The receiver, for each of the plurality of antennas respectively, to obtain a plurality of received signals corresponding to the number of said different spreading codes to despread with the different spreading codes a signal received through the antenna, Further , a flying object communication system, wherein maximum value synthesis is performed on the plurality of received signals obtained corresponding to each of the plurality of antennas . 2. The inter-flying-body communication system according to claim 1 , wherein the plurality of antennas are an upper antenna provided on an upper part of the aircraft and a lower antenna provided on a lower part of the aircraft . A communication method of an inter-flying body communication system for performing communication between flying bodies including a plurality of antennas, a transmitter, and a receiver,
In one of the flying objects, a transmission step of spreading the same data to be transmitted using a different spreading code for each of the plurality of antennas and transmitting the data through the plurality of antennas;
On the other side of the flying body, for each of the plurality of antennas, a plurality of received signals corresponding to the number of different spreading codes are obtained by despreading the signals received via the antennas using the different spreading codes. And a reception step of performing maximum value synthesis on the plurality of reception signals obtained corresponding to each of the plurality of antennas. A transmission / reception device used in an inter-flying communication system that performs communication between flying objects,
The transmission / reception device includes a plurality of antennas, a transmitter, and a receiver,
The transmitter spreads the same data to be transmitted using a different spreading code for each of the plurality of antennas and transmits the data through the plurality of antennas.
For each of the plurality of antennas, the receiver despreads signals received via the antennas using the different spreading codes to obtain a plurality of received signals corresponding to the number of different spreading codes, Further, a transmission / reception apparatus that performs maximum value synthesis on the plurality of received signals obtained corresponding to the plurality of antennas. The transmission / reception apparatus according to claim 4, wherein the plurality of antennas are an upper antenna provided at an upper portion of the aircraft and a lower antenna provided at a lower portion of the aircraft. A flying object comprising the transmission / reception device according to claim 4. A communication method of a transmission / reception device used in a communication system between flying objects that performs communication between flying objects,
The transmission / reception device includes a plurality of antennas, a transmitter, and a receiver,
The transmitter spreads the same data to be transmitted using a different spreading code for each of the plurality of antennas, and transmits the data via the plurality of antennas.
For each of the plurality of antennas, the receiver despreads signals received via the antennas using the different spreading codes to obtain a plurality of received signals corresponding to the number of different spreading codes, And a receiving step of performing maximum value synthesis on the plurality of received signals obtained corresponding to each of the plurality of antennas.

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