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An apparatus and method are employed to detect underground objects for use with a horizontal directional drilling (HDD) machine. A drill pipe is configured to cooperate with the HDD machine to produce a horizontal bore. A transmit apparatus is provided with the drill pipe and transmits electromagnet

An apparatus and method are employed to detect underground objects for use with a horizontal directional drilling (HDD) machine. A drill pipe is configured to cooperate with the HDD machine to produce a horizontal bore. A transmit apparatus is provided with the drill pipe and transmits electromagnetic probe signals ahead and/or to the side of the drill pipe. A receive apparatus is provided with the drill pipe and receives electromagnetic return signals resulting from the probe signals. A processor, coupled to the transmit and receive apparatuses, compares at least some of the return signals, and generates an alert signal indicative of a detected object in proximity with the drill pipe. HDD machine activity is modified, such as by reducing or halting drill pipe advancement, in response to the alert signal.

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1. An underground object detection system for use with a horizontal directional drilling (HDD) machine, comprising:a drill pipe configured to cooperate with the HDD machine to produce a horizontal bore;a transmit apparatus, the transmit apparatus provided with the drill pipe and transmitting electro

1. An underground object detection system for use with a horizontal directional drilling (HDD) machine, comprising:a drill pipe configured to cooperate with the HDD machine to produce a horizontal bore;a transmit apparatus, the transmit apparatus provided with the drill pipe and transmitting electromagnetic probe signals from the drill pipe;a receive apparatus, the receive apparatus provided with the drill pipe and receiving electromagnetic return signals resulting from the probe signals; anda processor coupled to the transmit and receive apparatuses, the processor comparing amplitudes of at least some of the return signals acquired at a time when one or more antennae of the transmit and receive apparatuses are oriented along a substantially horizontal plane relative to a surface of the earth, and generating an alert signal indicative of a detected object in proximity with the drill pipe in response to the processor comparing return signals having about the same amplitude. 2. The apparatus of claim 1, wherein the transmit apparatus comprises two transmit antennas situated apart from one another on the drill pipe. 3. The apparatus of claim 2, wherein the receive apparatus comprises a single receive antenna. 4. The apparatus of claim 2, wherein the receive apparatus comprises two receive antennas. 5. The apparatus of claim 2, wherein the two transmit antennas are situated about 180 degrees from one another on the drill pipe. 6. The apparatus of claim 1, wherein the receive apparatus comprises two receive antennas situated apart from one another on the drill pipe. 7. The apparatus of claim 6, wherein the transmit apparatus comprises a single transmit antenna. 8. The apparatus of claim 6, wherein the transmit apparatus comprises two transmit antennas. 9. The apparatus of claim 6, wherein the two receive antennas are situated about 180 degrees from one another on the drill pipe. 10. The apparatus of claim 1, wherein the transmit apparatus and receive apparatus share one or more common antennae. 11. The apparatus of claim 1, further comprising an orientation sensor provided with the drill pipe, the orientation sensor generating a horizontal orientation signal indicating that the one or more antennae of the transmit and receive apparatuses are oriented along the substantially horizontal plane relative to the surface of the earth, the processor comparing the return signal amplitudes in response to the horizontal orientation signal. 12. The apparatus of claim 1, wherein the drill pipe comprises a cutting tool, and the receive and transmit apparatuses are provided with the cutting tool. 13. The apparatus of claim 1, wherein the drill pipe comprises a cutting tool, and the drill pipe and the cutting tool are respectively provided with receive and transmit apparatuses. 14. The apparatus of claim 1, wherein the processor comprises a first processor provided at the drill pipe and a second processor provided at the HDD machine. 15. The apparatus of claim 14, wherein the first processor communicates the return signals to the second processor, and the second processor generates the alert signal. 16. The apparatus of claim 14, wherein the first processor communicates a processed set of data developed from the return signals to the second processor, and the second processor receives the processed data set from the first processor for further processing. 17. The apparatus of claim 1, wherein:the transmit apparatus transmits electromagnetic probe signals lateral to the drill pipe;the receive apparatus receives electromagnetic lateral return signals resulting from the laterally transmitted probe signals; andthe processor compares amplitudes of at least some of the lateral return signals, and generates an alert signal indicative of a detected object in proximity with a side of the drill pipe in response to the processor comparing lateral return signals having about the same amplitude. 18. The apparatus of claim 1, wherein the transmit and receive a pparatuses define an impulse ground penetrating radar apparatus. 19. The apparatus of claim 1, wherein the transmit and receive apparatuses define a stepped-frequency ground penetrating radar apparatus. 20. The apparatus of claim 1, wherein the transmit and receive apparatuses define a swept-frequency ground penetrating radar apparatus. 21. An underground object detection system, comprising:a horizontal directional drilling (HDD) machine;a drill pipe coupled to the HDD machine and controlled by the HDD machine to produce a horizontal bore;a transmit apparatus, the transmit apparatus provided with the drill pipe and transmitting electromagnetic probe signals from the drill pipe;a receive apparatus, the receive apparatus provided with the drill pipe and receiving electromagnetic return signals resulting from the probe signals;a first processor provided proximate the drill pipe and coupled to the transmit and receive apparatuses, the first processor receiving return signal data from the receive apparatus; anda second processor provided at the HDD machine, one or both of the first and second processors comparing amplitudes of at least some of the return signals acquired at a time when one or more antennae of the transmit and receive apparatuses are oriented along a substantially horizontal plane relative to a surface of the earth, and generating an alert signal indicative of a detected object in proximity with the drill pipe in response to comparing return signals having about the same amplitude, and the second processor modifying movement of the drill pipe in response to an alert signal. 22. The apparatus of claim 21, wherein the transmit apparatus and receive apparatus share one or more common antennae. 23. The apparatus of claim 21, wherein the transmit and receive apparatuses each comprise two antennas situated apart from one another on the drill pipe. 24. The apparatus of claim 21, wherein the transmit apparatus comprises two transmit antennas situated about 180 degrees from one another on the drill pipe. 25. The apparatus of claim 21, wherein the receive apparatus comprises two receive antennas situated about 180 degrees from one another on the drill pipe. 26. The apparatus of claim 21, further comprising an orientation sensor provided with the drill pipe, the orientation sensor generating a horizontal orientation signal indicating that the one or more antennae of the transmit and receive apparatuses are oriented along the substantially horizontal plane relative to the surface of the earth, the first or second processor comparing return signal amplitudes in response to the horizontal orientation signal. 27. The apparatus of claim 21, wherein the drill pipe comprises a cutting tool, and the receive and transmit apparatuses are provided with the cutting tool. 28. The apparatus of claim 21, wherein the drill pipe comprises a cutting tool, and the drill pipe and the cutting tool are respectively provided with receive and transmit apparatuses. 29. The apparatus of claim 21, wherein the first processor compares amplitudes of at least some of the return signals and, in response to comparing return signals having about the same amplitude, generates the alert signal. 30. The apparatus of claim 21, wherein the second processor compares amplitudes of at least some of the return signals and, in response to comparing return signals having about the same amplitude, generates the alert signal. 31. The apparatus of claim 21, wherein the second processor modifies movement of the drill pipe by halting movement of the drill pipe in response to the alert signal. 32. The apparatus of claim 21, wherein the second processor modifies movement of the drill pipe by reducing a rate of drill pipe displacement in response to the alert signal. 33. The apparatus of claim 21, wherein the second processor modifies movement of the drill pipe by modifying steering of the drill pipe in response to the alert signal. 34. The apparatus of claim 21, wherein the se cond processor, in response to the alert signal, modifies a rate of drill pipe displacement as a function of drill pipe proximity with the object. 35. The apparatus of claim 21, wherein the first or second processor modifies the alert signal presented to an operator of the HDD machine as a function of drill pipe proximity with the object. 36. The apparatus of claim 21, wherein the transmit and receive apparatuses define an impulse ground penetrating radar apparatus. 37. The apparatus of claim 21, wherein the transmit and receive apparatuses define a stepped-frequency ground penetrating radar apparatus. 38. The apparatus of claim 21, wherein the transmit and receive apparatuses define a swept-frequency ground penetrating radar apparatus. 39. The apparatus of claim 21, wherein:the transmit apparatus transmits electromagnetic probe signals lateral to the drill pipe;the receive apparatus receives electromagnetic lateral return signals resulting from the laterally transmitted probe signals; andthe first or second processor compares amplitudes of at least some of the lateral return signals, and generates an alert signal indicative of a detected object in proximity with a side of the drill pipe in response to the first or second processor comparing lateral return signals having about the same amplitude. 40. A method of detecting an underground object for use with a horizontal directional drilling (HDD) machine, comprising:moving a drill pipe and cutting tool using the HDD machine to produce a horizontal bore;transmitting, from one or both of the drill pipe and cutting tool, electromagnetic probe signals;receiving, at one or both of the drill pipe and cutting tool, electromagnetic return signals resulting from the probe signals;comparing amplitudes of at least some of the return signals received at a time when one or more antennae provided at the drill pipe or cutting tool are oriented along a substantially horizontal plane relative to a surface of the earth; andgenerating an alert signal indicative of a detected object in proximity with one or both of the drill pipe and cutting tool in response to comparing return signals having about the same amplitude. 41. The method of claim 40, wherein transmitting the probe signals comprises simultaneously transmitting a probe signal from at least two spatially separated locations of one or both of the drill pipe and cutting tool. 42. The method of claim 41, wherein receiving the return signals comprises receiving return signals at at least two spatially separated locations of one or both of the drill pipe and cutting tool. 43. The method of claim 40, wherein transmitting the probe signals comprises transmitting a probe signal from at least one location of the drill pipe or cutting tool during each of a plurality of drill pipe rotations. 44. The method of claim 43, wherein receiving the return signals comprises receiving return signals at at least one location of the drill pipe or cutting tool. 45. The method of claim 43, wherein receiving the return signals comprises receiving return signals at at least two spatially separated locations of one or both of the drill pipe and cutting tool. 46. The method of claim 40, wherein transmitting the probe signals comprises transmitting temporally separated probe signals from at least two locations of one or both of the drill pipe and cutting tool. 47. The method of claim 46, wherein receiving the return signals comprises receiving return signals at at least one location of the drill pipe or cutting tool. 48. The method of claim 40, further comprising generating a horizontal orientation signal indicating that the probe signals and return signals are respectively transmitted and received along the substantially horizontal plane relative to the surface of the earth, and comparing return signal amplitudes further comprises comparing amplitudes of at least some of the return signals in response to the horizontal orientation signal. 49. The method of claim 40, further comprising modifying movement of the drill pipe and cutting tool in response to the alert signal. 50. The method of claim 40, further comprising halting movement of the drill pipe and cutting tool in response to the alert signal. 51. The method of claim 40, further comprising reducing a rate of drill pipe and cutting tool displacement in response to the alert signal. 52. The method of claim 40, further comprising modifying steering of the drill pipe and cutting tool in response to the alert signal. 53. The method of claim 40, further comprising modifying a rate of drill pipe and cutting tool displacement as a function of drill pipe or cutting tool proximity with the object in response to the alert signal. 54. The method of claim 40, further comprising modifying the alert signal presented to an operator of the HDD machine as a function of drill pipe or cutting tool proximity with the object in response to the alert signal. 55. The method of claim 40, further comprising:transmitting electromagnetic probe signals lateral to the drill pipe;receiving electromagnetic lateral return signals resulting from the laterally transmitted probe signals;comparing amplitudes of at least some of the lateral return signals;and generating an alert signal indicative of a detected object in proximity with a side of the drill pipe in response to comparing lateral return signals having about the same amplitude. 56. The method of claim 40, wherein the probe and return signals comprise impulse ground penetrating radar signals. 57. The method of claim 40, wherein the probe and return signals comprise stepped-frequency ground penetrating radar signals. 58. The method of claim 40, wherein the probe and return signals comprise swept-frequency ground penetrating radar signals. 59. The method of claim 40, further comprising modifying delivery of drilling fluid through the drill pipe in response to the alert signal. 60. The method of claim 40, further comprising terminating delivery of drilling fluid through the drill pipe in response to the alert signal.