JP2960844B2 - Radar detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a radar using a spread spectrum (SS) system which is a broadband communication system.

[0002]

2. Description of the Related Art The SS system is divided into a frequency hopping (FH) and a direct spreading system (DS) as shown in FIG. The FH method switches the frequency over a wide range.
The S method is a method of inverting the phase at a fast cycle, and each has the following features. 1. Since the power is spread over a wide band, it is difficult to distinguish it from noise. 2. The power at the center frequency (carrier frequency) is small and it is difficult to tune on the detecting side. FIG. 11 shows, for example, “INTRODUCTION T” by D. Curtis Schleher.
7 is a diagram showing a conventional radar detection apparatus shown in "O ELECTRONIC WARFARE" p442 FIG. 7-2, in which 9 is a broadband receiver, 10 is a pulse analyzer, and 11 is a signal identification processor.

Next, the operation will be described. The radar signal is received by the broadband receiver 9 and its video output is classified by the pulse analyzer 10 into data such as pulse width and pulse period. These values are analyzed by the signal identification processor 11 to identify the radar.

[0004]

Since the conventional radar detection apparatus is configured as described above, it cannot cope with the SS system radar used for continuous waves. There is a problem that the sensitivity does not increase and it is difficult to receive the SS signal.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to obtain a radar detection device which can detect a continuous wave SS signal and can receive it with high sensitivity.

[0006]

According to a first aspect of the present invention, there is provided a radar detecting apparatus comprising a plurality of narrow bands each capable of independently tuning a frequency.
Area receiver and the video output of each of these narrowband receivers
And a direct addition system
The configuration is such that a ram spread signal can be detected.

According to a second aspect of the present invention, there is provided a radar detecting apparatus.
Multiple narrowband receivers that can be independently tuned, and
From the amplitude of each video output of the narrowband receiver
And a center frequency calculator for calculating
It has a configuration that can detect spread spectrum signals.
You.

[0008] radar detecting apparatus according to claim 3, claim 1 Symbol
In the radar detection system described above, the phase
Equipped with a DS pattern analyzer for analyzing change patterns
It is a thing.

[0009] radar detecting apparatus according to claim 4, claim 2 Symbol
Radar detection device, the center frequency calculation device
Tuner that tunes to that frequency information
Receiver and the phase connected to this tunable receiver
And a detector.

[0010]

[0011]

[0012]

According to the first aspect of the present invention, a continuous wave SS signal is provided.
Signal with multiple narrowband receivers with high sensitivity
Analysis is now possible, so conventional detectors
Detection of the SS signal, which has been difficult, becomes possible.

[0013] The radar detection apparatus according to the second aspect of the present invention provides a continuous wave S
S signal is received with high sensitivity by multiple narrow band receivers, and DS method
Since the analysis of the expression became possible, the conventional detection device
In this case, it is possible to detect the SS signal, which has been difficult.

[0014] radar detecting apparatus according to claim 3, the continuous wave S
S signal is received with high sensitivity by multiple narrow band receivers, and DS method
Since the analysis of the expression became possible, the conventional detection device
In this case, it is possible to detect the SS signal, which has been difficult.

The radar detecting apparatus according to claim 4, the continuous wave S
S signal is received with high sensitivity by multiple narrow band receivers, and DS method
Since the analysis of the expression became possible, the conventional detection device
In this case, it is possible to detect the SS signal, which has been difficult .

[0016]

[0017]

[0018]

【Example】

Embodiment 1 FIG. Embodiment 1 of the present invention will be described below with reference to the drawings. In the figure, 1 is a narrow band receiver, and 2 is a threshold circuit.

Next, the operation will be described. In this embodiment, F
The purpose is to detect the H system. The received SS signal is distributed and input to the narrowband receiver 1. The narrow-band receiver 1 is tuned at adjacent frequencies and detects each assigned frequency band. The detected video is input to the threshold circuit 2, and when the video amplitude is at a certain level (that is, a signal is present) as shown in FIG.
H ”signal. By observing this output, FH
The system SS signal can be detected.

According to the first embodiment, a continuous wave SS signal is received by a large number of narrow band receivers with high sensitivity, and the FH system can be analyzed. It is possible to detect a strong SS signal.

Embodiment 2 FIG. In the above-described embodiment, the apparatus corresponding to the FH system is shown, but the apparatus corresponding to the DS system is shown in FIG. In FIG. 3, a video addition circuit 3 is connected instead of the threshold circuit of FIG. As shown in FIG. 4, when the phase is inverted, the frequency is spread, so that the video voltage can be extracted without the narrowband receiver 1 being tuned to the SS signal. Since each of the narrow band receivers outputs a video voltage at the same timing, the video voltages are output from the video addition circuit 3.
By doing so, the phase inversion portion can be detected with high sensitivity (the integration effect due to the addition).

According to the second embodiment, since a continuous wave SS signal is received by a large number of narrow band receivers with high sensitivity and the DS system can be analyzed, it is difficult for a conventional radar detection apparatus. It is possible to detect a strong SS signal.

Embodiment 3 FIG. As shown in FIG. 5, the center frequency (carrier frequency) of the DS system can be analyzed. FIG.
As shown in the figure, the center frequency calculation device 4 is connected to the narrow band receiver 1. The center frequency calculator 4 calculates the envelope of the video voltage of the phase inverting unit of each of the narrowband receivers 1 as shown in FIG. 6 and sets the center frequency of the envelope as the center frequency. Is what you want.

According to the third embodiment, since a continuous wave SS signal is received by a large number of narrow band receivers with high sensitivity and the DS system can be analyzed, it is difficult for the conventional radar detection apparatus. It is possible to detect the SS signal.

Embodiment 4 FIG. In the fourth embodiment, as shown in FIG. 7, an FH pattern analyzer 5 is added to FIG. The received SS signal is distributed and input to the narrowband receiver 1. Narrowband receiver 1
Are tuned at adjacent frequencies and detect each assigned frequency band. The detected video is input to the threshold circuit 2 and outputs a "HIGH" signal when the video amplitude is at a certain level (that is, when a signal is present) as shown in FIG. By automatically converting a frequency change pattern into digital data and observing this output, a data pattern of the FH system can be analyzed.

According to the fourth embodiment, a continuous wave SS signal is received by a large number of narrow band receivers with high sensitivity, and the FH system can be analyzed. It is possible to detect a strong SS signal.

Embodiment 5 FIG. As in the fourth embodiment, automatic analysis of the DS pattern is also possible as shown in FIG. A DS pattern analyzer 6 is added to FIG. 2 to automatically convert a phase inversion pattern into digital data. As shown in FIG. 4, when the phase is inverted, the frequency is spread, so that the video voltage can be extracted even when the narrowband receiver 1 is not tuned to the SS signal.
Since each of the narrow band receivers outputs a video voltage at the same timing, the video voltages are added together by the video addition circuit 3 to detect the phase inversion section with high sensitivity (integration effect due to the addition) and to determine the phase inversion pattern. By automatically converting to digital data and observing it, DS data pattern
Can be analyzed.

According to the fifth embodiment, since a continuous wave SS signal is received by a large number of narrow band receivers with high sensitivity and the DS system can be analyzed, it is difficult for a conventional radar detection apparatus. It is possible to detect a strong SS signal.

Embodiment 6 FIG. Using the center frequency measurable in FIG. 5, tuning can be performed by the tunable receiver 7 as shown in FIG. 9, and a phase change or the like can be analyzed in detail by the phase detector 8. In this case, the tuning frequency is adjusted so that the phase detection output becomes flat as shown in FIG. 10 , so that the center frequency can be precisely analyzed.

According to the sixth embodiment, since a continuous wave SS signal is received by a large number of narrow band receivers with high sensitivity and the DS system can be analyzed, it is difficult to use the conventional radar detection apparatus. It is possible to detect the SS signal.

[0031]

[Effect of the Invention] radar detecting apparatus according to claim 1, respectively
Have multiple narrowband receivers that can independently tune frequency,
Video summation for summing each video output of these narrowband receivers
Circuit and a direct spread spectrum spread spectrum signal.
Detectable configuration makes it possible to analyze the DS system.
So that it was difficult for conventional detectors
It is possible to detect tangent spread spectrum spread signals.
You.

The radar detecting apparatus according to claim 2, respectively
Multiple narrowband receivers that can be independently tuned, and
From the amplitude of each video output of the narrowband receiver
And a center frequency calculator for calculating
Since the configuration is such that the spread spectrum signal can be detected,
The direct-spread spectrum was difficult with conventional detectors
Detection of the ram spread signal becomes possible.

The radar detecting apparatus according to claim 3, claim 1 Symbol
In the radar detection system described above, the phase
Equipped with a DS pattern analyzer for analyzing change patterns
Configuration, which was difficult with conventional detectors.
It is possible to detect tangent spread spectrum spread signals.
You.

The radar detecting apparatus according to claim 4, claim 2 Symbol
Radar detection device, the center frequency calculation device
Tuner that tunes to that frequency information
Receiver and the phase connected to this tunable receiver
With a configuration equipped with a detector, the conventional detection device
Difficulty searching for direct spread spectrum signal which was difficult
Knowledge becomes possible.

[0035]

[0036]

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of a radar detection device according to the present invention.

FIG. 2 is a diagram showing an operation of the threshold circuit .

FIG. 3 is a block diagram of the second embodiment.

FIG. 4 is a diagram showing a video output of the phase inversion unit.

FIG. 5 is a block diagram of a third embodiment.

FIG. 6 is a diagram showing an envelope of an output of a phase inversion unit of each of the narrowband receivers.

FIG. 7 is a block diagram of a fourth embodiment.

FIG. 8 is a block diagram of a fifth embodiment.

FIG. 9 is a block diagram of a sixth embodiment.

FIG. 10 is a diagram showing a relationship between a phase detection output and a tuning state.

FIG. 11 is a block diagram of a conventional radar detection device.

FIG. 12 is a diagram showing two systems (FH and DS) of the SS system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Narrow band receiver 2 Threshold circuit 3 Video addition circuit 4 Center frequency calculator 5 FH pattern analyzer 6 DS pattern analyzer 7 Tunable receiver 8 Phase detector 9 Broadband receiver 10 Pulse analyzer 11 Signal identification processor

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01S 7/38 G01S 7/35

Claims (4)

(57) [Claims] 1. A multi-function device capable of independently tuning frequencies.
Number of narrowband receivers and the video output of each of these narrowband receivers
And a video addition circuit for adding power.
It is specially designed to detect spread spectrum signals.
Radar detection device. 2. A multi-frequency synchronizing apparatus, each of which can independently tune frequency.
Number of narrowband receivers and the video output of each of these narrowband receivers
Center frequency calculator that calculates the center frequency from the amplitude of force
And detects direct spread spectrum spread signals
A radar detection device having a possible configuration. 3. A phase change pattern from the video addition circuit.
It is equipped with a DS pattern analyzer that analyzes
The radar detection device according to claim 1, wherein 4. The frequency information from the center frequency calculating device.
Tunable receiver that tunes to that frequency upon receiving a notification
And a phase detector connected to this tunable receiver
The radar detection apparatus according to claim 2, further comprising:
Place.