Method of Measuring Distance, Notably for Short-Range Radar
First Claim
1. A method of measuring the distance of a target using an electromagnetic wave comprising at least one emission sequence of the FSK type at least two emission frequencies (F1, F2) emitted successively towards the said target a given number (p) of times inside the sequence forming a repetition cycle of the emission frequencies (F1, F2), the gap (δ
- F) between the emission frequencies (F1, F2) being substantially equal to an integer number k, k being greater than or equal to 1, of times the repetition frequency (SPRF) of the cycle of frequencies, the distance measurement being obtained on the basis of the measurement of difference of phases (Δ
φ
) between the signals received corresponding respectively to a first frequency (F1) and to a second frequency (F2).
4 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a procedure for measuring distance. It applies notably in respect of short-range radars, but not exclusively. The method uses an electromagnetic wave comprising at least one emission sequence (31, 32, 33, 34, 35) of the FSK type, at least two emission frequencies (F1, F2), emitted successively towards the said target a given number p of times inside the sequence. The gap δF between the emission frequencies (F1, F2) is substantially equal to an integer number k of times the repetition frequency (SPRF) of the cycle of frequencies, the distance measurement being obtained on the basis of the measurement of difference of phases Δφ between the signals received corresponding respectively to a first frequency (F1) and to a second frequency (F2).
17 Citations
7 Claims
-
1. A method of measuring the distance of a target using an electromagnetic wave comprising at least one emission sequence of the FSK type at least two emission frequencies (F1, F2) emitted successively towards the said target a given number (p) of times inside the sequence forming a repetition cycle of the emission frequencies (F1, F2), the gap (δ
- F) between the emission frequencies (F1, F2) being substantially equal to an integer number k, k being greater than or equal to 1, of times the repetition frequency (SPRF) of the cycle of frequencies, the distance measurement being obtained on the basis of the measurement of difference of phases (Δ
φ
) between the signals received corresponding respectively to a first frequency (F1) and to a second frequency (F2). - View Dependent Claims (2, 3, 4, 5, 6, 7)
- F) between the emission frequencies (F1, F2) being substantially equal to an integer number k, k being greater than or equal to 1, of times the repetition frequency (SPRF) of the cycle of frequencies, the distance measurement being obtained on the basis of the measurement of difference of phases (Δ
Specification