$LastChangedDate: 27-Juil-2011 $

# CL_cw_meanChaser

Mean chaser

## Calling Sequence

       [Zm] = CL_cw_meanChaser(Z0,dX0,alt[,er,mu])

## Description

- Computes the so-called "mean chaser" which is the relative altitude of the chaser that corresponds to the mean drift resulting from an impulsive maneuver in the tangential direction.

  The local orbital reference frame tied to the target is the LVLH (See CL_fr_lvlhMat).

## Parameters

Z0:

  Altitude of chaser at initial time in target frame [m] (1xN)

dX0:

  First component of chaser velocity in target frame at initial time [m/s] (1xN)

alt:

  Target altitude (from planet surface) [m] (1xN)

er:

  (optional) Equatorial radius [m] (default is %CL_eqRad)

mu:

  (optional) Gravitational constant [m^3/s^2] (default value is %CL_mu)

Zm:

  Mean chaser [m] (1xN)

## Authors

- CNES - DCT/SB

## See also

- CL_kp_params

- CL_cw_twoImpulse

## Bibliography

- 1) Mecanique spatiale, CNES - Cepadues 1995, Tome II, 16.3.2.4.2

## Examples

    Z0 = [30 20 15];
    dX0 = [7 8 9];
    alt = [260000 180000 300000];
    zm = CL_cw_meanChaser(Z0,dX0,alt);
    zm = CL_cw_meanChaser(Z0,dX0,alt(1));
    zm = CL_cw_meanChaser(Z0,dX0(1),alt(3));