Loran-C signal processor

DETAILED DESCRIPTION FIG.
1 shows the detailed block diagram of my novel signal processor 10.
The signal waveform input to the signal processor 10 is shown in FIG.
2A and is the signal transmitted by the Loran-C master and secondary stations.
An antenna and receiver (both not shown) well known in the art are used to receive the Loran-C signals which have a frequency spectrum including an unsuppressed 100 kilohertz carrier and both sidebands as shown in FIG.
3A.
The received signal is not immediately detected to obtain the pulse envelope waveform as is standardly done in the art.
Instead, the received but undetected signals are input to signal processor 10 at input 11.
The input signal is applied to a transmission means in the form of delay line 12 and to another transmission means in the form of impedance 13.
Impedance 13 is adjusted to have a small amount of impedance equal to the impedance of delay line 12 in one instance, and unequal in another instance, depending on whether or not it is desired to optimize signal-to-noise ratio or to locate a specific tracking point.
The time delay introduced by delay line 12 is five microseconds in the embodiment of my invention disclosed herein.
This delay is equal to one-half the period of the 100 Kilohertz carrier frequency.
The delay may be other multiples of five microseconds such as ten microseconds or twenty-five microseconds.
The five microsecond delay is exactly one-half cycle of the 100 kilohertz carrier frequency.
In FIG.
2C is shown an overlay of the original signal applied to summer or combiner 14 via impedance 13 (shown solid) and the signal applied to summer or combiner 14 via delay line 12 (shown dotted).
From FIG.
2C it can be seen that summer or combiner 14 algebraically combines the input signals by adding the positive half cycle of one of its two input signals with the negative half cycle of the other of its two input signals and visa versa at all times during its operation.
The waveform of the signal output from summer 14 depends on the adjustment of impedance 13 to achieve varying results