JPH0128469Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention receives a differential omega correction value signal, determines a differential omega correction value, and uses this correction value to directly perform phase correction on the received omega signal. In particular, it relates to a device for obtaining a differential omega corrected omega signal.

When using the differential omega system with an omega receiver that does not have a differential omega correction function, it is necessary to also install a differential omega correction value receiver to obtain the differential omega correction value. There is. In order to obtain the corrected phase difference, there are two methods: numerical calculation from the omega phase difference value and the correction value, and two methods: one is to calculate the corrected phase difference using the correction value, and the other is to directly correct the phase of the received omega signal using the correction value. There is a method of synthesizing the omega signals and processing this with an omega receiver.

The present invention makes the latter method possible, and by using this device, even an omega receiver that does not have a normal differential omega correction function can automatically calculate the corrected phase difference. There are advantages.

The figure is a block diagram of one embodiment of the present invention, in which 1 is a receiving antenna, 2 is a correction value receiver, 3 is a local oscillator,
4 is a phase shifter, 5 is a first frequency converter, 6 is an omega signal input terminal, 7 is a high pass filter, 8 is a second frequency converter, 9 is a low pass filter, 10
is the omega signal output terminal.

The differential omega correction value signal received by the receiving antenna 1 is demodulated by the correction value receiver 2, and the correction value is an angle signal of 0 to 2π, that is,
The phase angle correction value θDiff of the omega signal is determined.
On the other hand, the local oscillator 3 generates a frequency conversion signal having an angular frequency ω _L. Local oscillator 3 in phase shifter 4
The output signal Sinω _L t of the correction value receiver 2 output θDiff
and sends it to the first frequency converter 5. This phase-shifted signal is Sin(ω _L t+θDiff)
It is expressed as In the first frequency converter 5, the phase-shifted local oscillation signal Sin(ω _L t+θDiff) and the omega signal applied to the input terminal 6 of the omega signal
The output multiplied by Sinω _O t is further applied to the next stage high-pass filter 7, thereby extracting the frequency component of ω _O +ω _L. This signal is Cos{(ω _O +ω _L )
t+θDiff}. The second frequency converter 8 uses this signal and the output Sinω _L of the local oscillator 3
By multiplying by t to perform frequency conversion and passing the result through a low-pass filter 9, we can obtain Sin{(ω _O +
Obtain the original frequency ω _L ) t + θDiff − ω _L t}=Sin(ω _O t + θDiff), and apply this to the output terminal 1 of the omega signal.
Output as an omega signal that has been differentially omega corrected from 0.

In this way, in the present invention, the omega signal is frequency-converted by the first frequency converter, and the output passed through the high-pass filter and the output of the local oscillator are converted to the original frequency by the second frequency converter. Depending on the configuration, the phase of the omega signal itself can be corrected, so
Even with an omega receiver without differential omega correction capability, a corrected phase difference can be automatically obtained by simply connecting this device to its signal input terminal. Furthermore, even if the local oscillator has relatively low stability, it does not affect the measurement of the omega signal.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the device of the present invention. 1... Receiving antenna, 2... Correction value receiver, 3...
... Local oscillator, 4 ... Phase shifter, 5 ... First frequency converter, 6 ... Omega signal input terminal, 7 ... High pass filter, 8 ... Second frequency converter, 9
...Low pass filter, 10...Omega signal output terminal.

Claims (1)

[Scope of utility model registration request] A local oscillator that generates a local oscillation signal; and a local oscillator that receives the local oscillation signal and the differential omega correction value, shifts the phase of the local oscillation signal by the differential omega correction value, and generates a phase-shifted local oscillator. A first frequency conversion step that obtains an omega signal by inputting a phase shifter that outputs an oscillation signal, an omega signal and a phase-shifted local oscillation signal, and converting the frequency of the omega signal by the phase-shifted local oscillation signal. and inputting the frequency-converted omega signal and the local oscillation signal, and converting the frequency-converted omega signal again using the local oscillation signal to return the frequency to the original frequency. A differential omega correction device comprising: a second frequency converter for obtaining a signal; and outputting a differential omega corrected omega signal.