Apparatus and method for facilitating terrestrial transmissions at frequencies also used for satellite transmissions to a common geographic area

An apparatus for simultaneously providing terrestrially transmitted signals on a common frequency with satellite signals transmitted from a satellite along a satellite signal route to a first location, the satellite signals being transmitted at a first frequency for reception at a satellite receiving antenna which may be at the first location, the satellite receiving antenna producing a maximum gain for signals received along a satellite receiving antenna centerline and less gain at angles to said centerline, the satellite signals having a signal power level such that, when the satellite receiving antenna is placed in a satellite reception position in which the satellite transmission route lies within a satellite reception look angle about the satellite receiving antenna centerline, the satellite signals result in satellite input signals from the satellite receiving antenna which are at least at a minimum usable satellite input signal level, the apparatus comprising:

• (a) a first terrestrial transmitter for transmitting signals at the first frequency along a wireless transmission route from a first terrestrial transmitter location to the first location, the wireless transmission route lying at an angle from the satellite receiving antenna centerline, when the satellite receiving antenna is in the satellite reception position, such that the terrestrial signals present at the first location result in terrestrial input signals from the satellite receiving antenna which are at a power level less than an interference level with respect to the satellite input signals, the terrestrial signals present at the first location having a power level at least at a minimum usable terrestrial signal level;
• (b) satellite signal power monitoring means for substantially continuously detecting the satellite signal power level at a location near the first terrestrial transmitter;
• and
• (c) transmission power adjusting means associated with the first terrestrial transmitter for setting the transmission power of the first terrestrial transmitter to a non-interfering level based upon the satellite signal power level detected by the satellite signal power monitoring means, the non-interfering level being a level ensuring that substantially each location within an effective transmission area around the first terrestrial transmitter receives terrestrial signals from the first terrestrial transmitter at a power level to produce non-interfering terrestrial input signals from a satellite receiving antenna aligned to receive satellite signals at said location, the non-interfering terrestrial input signals being at a power level less than the interference level with respect to the satellite input signals produced by the satellite receiving antenna at said location.

An apparatus for simultaneously providing terrestrially transmitted signals on a common frequency with satellite signals transmitted from a satellite, the satellite signals being transmitted at a first frequency along a satellite transmission route to a satellite receiving antenna at a location which may be anywhere within a geographic service area, the satellite receiving antenna producing a maximum gain for signals received along a satellite receiving antenna centerline and less gain at angles from said centerline, the satellite signals having a signal power level which, when the satellite receiving antenna is placed at a satellite reception position in which the satellite transmission route lies within a satellite reception look angle about the satellite receiving antenna centerline, results in satellite input signals from the satellite receiving antenna, the satellite input signals being at least at a minimum usable satellite input signal level, the apparatus comprising:

• (a) a plurality of spaced apart terrestrial transmitters, each terrestrial transmitter transmitting terrestrial signals at the first frequency, the plurality of spaced apart terrestrial transmitters being arranged such that substantially each respective location within the geographic service area has a wireless transmission route to one of the terrestrial transmitters, the wireless transmission route lying at an angle from the satellite receiving antenna centerline when the satellite receiving antenna is in the satellite reception position at the respective location such that the terrestrial signals present at the respective location are at least at a minimum usable terrestrial signal level but result in terrestrial input signals from the satellite receiving antenna which are at a power level less than an interference level with respect to the satellite input signals;
• (b) satellite signal power monitoring means for substantially continuously detecting the satellite signal power level at a monitoring location within the geographic service area;
• and
• (c) transmission power adjusting means associated with the terrestrial transmitters for setting the transmission power of the terrestrial transmitters to a non-interfering level based upon the satellite signal power level detected by the satellite signal power monitoring means, the non-interfering level being a level ensuring that substantially each location within the geographic service area receives terrestrial signals from each of the terrestrial transmitters at a power level to result in non-interfering terrestrial input signals from a satellite receiving antenna aligned to receive satellite signals at said location, the noninterfering terrestrial input signals being at a power level less than the interference level with respect to the satellite input signals produced by the satellite receiving antenna at said location.

A method for reusing a first transmission frequency already in use for transmitting satellite signals from a satellite along a satellite signal route to a first location for reception at a satellite receiving antenna which may be at the first location, the satellite receiving antenna producing a maximum gain for signals received along a satellite receiving antenna centerline and less gain at angles from said centerline, the satellite signals having a signal power level at the first location such that, when the satellite receiving antenna is placed in a satellite reception position in which the satellite transmission route lies within a satellite reception look angle about the satellite receiving antenna centerline, the satellite signals produce satellite input signals from the satellite receiving antenna which are at least at a minimum usable satellite input signal level, the method comprising the steps of:

• (a) determining the satellite signal power level;
• (b) setting the transmission power of a first terrestrial transmitter to a non-interfering level based upon the determined satellite signal power level, the non-interfering level being a level ensuring that substantially each location within an effective transmission area around the first terrestrial transmitter receives terrestrial signals from the first terrestrial transmitter at a power level to produce non-interfering terrestrial input signals from a satellite receiving antenna aligned to receive the satellite signals at said location, the non-interfering terrestrial input signals being at a power level less than an interference level with respect to the satellite input signals produced by the satellite receiving antenna at said location;
• and
• (c) transmitting terrestrial signals at the non-interfering power level and first transmission frequency from the first terrestrial transmitter to the effective transmission area.